Timeline – Richard Cabot

SC-04-08

Richard Cabot posted an update in the group SC-04-08
3 weeks ago
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<TITLE> [SC-04-08] x216 - MLS properties </TITLE> pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } <H1>[SC-04-08] x216 - MLS properties</H1> Mark Yonge <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20x216%20-%20MLS%20properties&In-Reply-To=%3C7BDF0AA9-8584-4CEB-84E1-DF6FA7FA926F%40aes.org%3E" TITLE="[SC-04-08] x216 - MLS properties">standards at aes.org </A> Fri May 2 09:37:44 MDT 2014 <UL> <LI>Previous message: <A HREF="000168.html">[SC-04-08] Noise signal samples: AES-X216 </A></li> <LI>Next message: <A HREF="000173.html">[SC-04-08] x216 - MLS properties </A></li> <LI> Messages sorted by: <a href="date.html#172">[ date ]</a> <a href="thread.html#172">[ thread ]</a> <a href="subject.html#172">[ subject ]</a> <a href="author.html#172">[ author ]</a> </LI> </UL> <HR>  <PRE>Dear SC-04-08, I am forwarding here a message from Thomas Lago, originally sent on 27 April 2014. Because it contained an attachment, it had been held by the reflector server for moderation. I have posted the attachment directly to the SC-04-08 document site with the filename: x216-140427-tl-mls-properties.pdf A direct login is available at: <A HREF="https://secure.aes.org/standards/documents/?ID=91">https://secure.aes.org/standards/documents/?ID=91</A> regards, Mark Yonge AES Standards Manager Begin forwarded message: > From: <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-bounces at standards.aes.org</A> > Date: 2 May 2014 14:50:09 +0100 > To: <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-owner at standards.aes.org</A> > Subject: Forward of moderated message > > > From: Thomas Lagö <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">thomaslago at msn.com</A>> > Date: 27 April 2014 17:34:59 +0100 > To: Working group on Measurement and equalization of sound systems in rooms <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08 at standards.aes.org</A>> > Subject: Re: [SC-04-08] GoToMeeting Invitation - AES SC-04-08, Berlin > > > Dear All, > > As promised in the meeting, I am sending a short note on how to create an MLS and its main properties. Feel free to ask questions or comment. > > Is this best excitation signal when a sync is not used? Maybe we should create a table where properties for different generators are described, given what we try to accomplish? That is common in experimental structural dynamics (like modal analysis). I have been teaching numerous courses on the topic. > > I had a rather good phone connection but sound quality in the room could have been better. > > Best regards, > Thomas > > > > On 27 Apr 2014, at 15:52, Glenn Leembruggen <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">glenn at acousticdirections.com</A>> wrote: > >> Hi Mark >> The quality of the teleconference was very poor, and it meant that I could >> not contribute at all to the meeting. Sometimes I missed out on whole >> sentences. >> >> I think the link was fine,; My experience tells me the problem was trying to >> get a whole lot of voices in a reverberant room picked up by a microphone >> that was miles from anyone, and a non-linear codec that does its best to >> gurgle at the first opportunity it can get with a low level, reverberant >> signal. >> >> This is a much better way, but it will involve more microphones and a >> discrete signal processor. >> >> Hope it can get better next time... >> Glenn >> >> >> Glenn Leembruggen >> Acoustic Directions Pty Ltd >> Consultants in Acoustics & Sound Systems >> tel: +612 9568 4684 >> fax: +612 9572 8939 >> mob: +61 418 207 085 >> >> >> -----Original Message----- >> From: <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-bounces at standards.aes.org</A> >> [mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-bounces at standards.aes.org</A>] On Behalf Of Mark Yonge >> Sent: Saturday, 26 April 2014 9:55 PM >> To: <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08 at standards.aes.org</A> >> Subject: [SC-04-08] GoToMeeting Invitation - AES SC-04-08, Berlin >> >> Dear SC-04-08, >> >> I received a few requests to be able to contribute remotely to this >> working-group's face-to-face meeting in Berlin. I am pleased to announce >> that we can provide a remote call-in facility for this meeting. >> >> We will use GoToMeeting - a web conferencing service that is more convenient >> for this purpose than (for example) Skype. >> >> While you are connected you will be able to hear the face-to-face meeting. >> Your GoToMeeting controls include a microphone mute - please consider muting >> your microphone unless you wish to speak, otherwise this meeting will be >> hearing your background noises and echoes throughout the meeting! Please >> note that the presenter controlling the projected image on the meeting's >> screen in Berlin is using a different laptop to the GoToMeeting host and so, >> although GoToMeeting offers a screen-share facility, we will not be able to >> offer this. >> >> Please find below your login details. >> >> When you call in you will be added automatically to the meeting. The meeting >> is scheduled to start at 11:00 Berlin time - please check how this >> corresponds to your local time. >> >> Please note that this service is provided on a best-efforts basis - we can't >> guarantee the performance of the Internet! we are also limited to a maximum >> of 25 remote participants, so please understand if you are unable to get >> access. >> >> regards, >> >> Mark Yonge >> AES Standards Manager >> >> >> 1. Please join my meeting, 27 Apr 2015 at 11:00 GMT+02:00. >> <A HREF="https://global.gotomeeting.com/join/611701037">https://global.gotomeeting.com/join/611701037</A> >> >> 2. Use your microphone and speakers (VoIP) - a headset is recommended. Or, >> call in using your telephone. >> >> Norway: +47 21 04 29 76 >> Sweden: +46 (0) 852 500 182 >> Switzerland: +41 (0) 225 3311 20 >> Germany: +49 (0) 811 8899 6928 >> United States: +1 (213) 493-0618 >> Canada: +1 (647) 497-9372 >> United Kingdom: +44 (0) 20 3657 6777 >> Australia: +61 2 8355 1036 >> France: +33 (0) 170 950 586 >> Access Code: 611-701-037 >> Audio PIN: Shown after joining the meeting >> >> Meeting ID: 611-701-037 >> >> GoToMeeting® >> Online Meetings Made Easy® >> >> Not at your computer? Click the link to join this meeting from your iPhone®, >> iPad®, Android® or Windows Phone® device via the GoToMeeting app. >> >> >> Mark Yonge >> AES Standards Manager >> >> <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">standards at aes.org</A> >> tel: +44 1594 517200 >> skype: markyonge >> >> >> >> >> _______________________________________________ >> SC-04-08 mailing list >> <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">SC-04-08 at standards.aes.org</A> >> <<A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A>> Mark Yonge AES Standards Manager <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">standards at aes.org</A> tel: +44 1594 517200 skype: markyonge </PRE>  <HR> <UL>  <LI>Previous message: <A HREF="000168.html">[SC-04-08] Noise signal samples: AES-X216 </A></li> <LI>Next message: <A HREF="000173.html">[SC-04-08] x216 - MLS properties </A></li> <LI> Mess...

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<TITLE> [SC-04-08] GoToMeeting Invitation - AES SC-04-08, Berlin </TITLE> pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } <H1>[SC-04-08] GoToMeeting Invitation - AES SC-04-08, Berlin</H1> philip newell <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20GoToMeeting%20Invitation%20-%20AES%20SC-04-08%2C%20Berlin&In-Reply-To=%3CCAEEhACkgxxtN96NEoYC0dS_qtDMSV%3D9NVM5UFLi03PQ4HyzcRg%40mail.gmail.com%3E" TITLE="[SC-04-08] GoToMeeting Invitation - AES SC-04-08, Berlin">philiprnewell at gmail.com </A> Mon Apr 28 05:51:35 MDT 2014 <UL> <LI>Previous message: <A HREF="000170.html">[SC-04-08] GoToMeeting Invitation - AES SC-04-08, Berlin </A></li> <LI>Next message: <A HREF="000168.html">[SC-04-08] Noise signal samples: AES-X216 </A></li> <LI> Messages sorted by: <a href="date.html#171">[ date ]</a> <a href="thread.html#171">[ thread ]</a> <a href="subject.html#171">[ subject ]</a> <a href="author.html#171">[ author ]</a> </LI> </UL> <HR>  <PRE>Dear Mark, I only received the invitation this morning, despite it being dated the 26th. I spent a lot of time working on SMPTE group e-mails yesterday afternoon, so I wouldn't have missed anything coming in. It certainly did not arrive until this morning. Also, when it arrived in my gmail account this morning, it was amongst the 'Promotions' and not in my general section. However, I do check Promotions every day exactly to catch anything like this. Last autumn, I couldn't get in through the AES link (perhaps it was overloaded), yet it is very rare that I cannot get into an SMPTE meeting (although they are usually good for up to 75 callers, not 25. I got Pete Soper's e-mail OK on the 25th. Best wishes, Philip On 28 April 2014 12:11, Bob Walker <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">bob at rlsw.eclipse.co.uk</A>> wrote: > Mark, > > For some reason not known to me, I didn't receive any messages about the > meeting in Berlin yesterday (27th) until today (I was busy for the last few > days). > > The last messages of any kind that I received from the group was 16th > January, 2014 and then Peter Soper's message of 25th (last Friday). > > I did know about the meeting from the Convention promotions and I > certainly would not have been able to attend it, but I did expect to get > some of the preliminaries in advance of the meeting. > > It is possible that my yahoo email account has been marking them as spam. > I have just checked and found only two recent SC-04-08 messages in there, > but I don't know how often it clears it out. > > It didn't used to do this. Up to January 16th I was certainly getting > everything - so something changed. > > > Regards, > > Bob > ------------------------------------------------------- > Bob Walker, 28 Woodcote Hurst, Epsom, KT18 7DT. Tel: 01372 740384. Mobile: > 07752 569014, Skype: bobwalker123 > > > > On 26/04/2014 12:55, Mark Yonge wrote: > >> Dear SC-04-08, >> >> I received a few requests to be able to contribute remotely to this >> working-group's face-to-face meeting in Berlin. I am pleased to announce >> that we can provide a remote call-in facility for this meeting. >> >> We will use GoToMeeting - a web conferencing service that is more >> convenient for this purpose than (for example) Skype. >> >> While you are connected you will be able to hear the face-to-face >> meeting. Your GoToMeeting controls include a microphone mute - please >> consider muting your microphone unless you wish to speak, otherwise this >> meeting will be hearing your background noises and echoes throughout the >> meeting! Please note that the presenter controlling the projected image on >> the meeting's screen in Berlin is using a different laptop to the >> GoToMeeting host and so, although GoToMeeting offers a screen-share >> facility, we will not be able to offer this. >> >> Please find below your login details. >> >> When you call in you will be added automatically to the meeting. The >> meeting is scheduled to start at 11:00 Berlin time - please check how this >> corresponds to your local time. >> >> Please note that this service is provided on a best-efforts basis - we >> can't guarantee the performance of the Internet! we are also limited to a >> maximum of 25 remote participants, so please understand if you are unable >> to get access. >> >> regards, >> >> Mark Yonge >> AES Standards Manager >> >> >> 1. Please join my meeting, 27 Apr 2015 at 11:00 GMT+02:00. >> <A HREF="https://global.gotomeeting.com/join/611701037">https://global.gotomeeting.com/join/611701037</A> >> >> 2. Use your microphone and speakers (VoIP) - a headset is recommended. >> Or, call in using your telephone. >> >> Norway: +47 21 04 29 76 >> Sweden: +46 (0) 852 500 182 >> Switzerland: +41 (0) 225 3311 20 >> Germany: +49 (0) 811 8899 6928 >> United States: +1 (213) 493-0618 >> Canada: +1 (647) 497-9372 >> United Kingdom: +44 (0) 20 3657 6777 >> Australia: +61 2 8355 1036 >> France: +33 (0) 170 950 586 >> Access Code: 611-701-037 >> Audio PIN: Shown after joining the meeting >> >> Meeting ID: 611-701-037 >> >> GoToMeeting® >> Online Meetings Made Easy® >> >> Not at your computer? Click the link to join this meeting from your >> iPhone®, iPad®, Android® or Windows Phone® device via the GoToMeeting app. >> >> >> Mark Yonge >> AES Standards Manager >> >> <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">standards at aes.org</A> >> tel: +44 1594 517200 >> skype: markyonge >> >> >> >> >> _______________________________________________ >> SC-04-08 mailing list >> <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">SC-04-08 at standards.aes.org</A> >> <<A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A>> >> >> >> ----- >> No virus found in this message. >> Checked by AVG - www.avg.com >> Version: 2013.0.3469 / Virus Database: 3722/7402 - Release Date: 04/27/14 >> >> >> >> > _______________________________________________ > SC-04-08 mailing list > <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">SC-04-08 at standards.aes.org</A> > <<A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A>> > </PRE>  <HR> <UL>  <LI>Previous message: <A HREF="000170.html">[SC-04-08] GoToMeeting Invitation - AES SC-04-08, Berlin </A></li> <LI>Next message: <A HREF="000168.html">[SC-04-08] Noise signal samples: AES-X216 </A></li> <LI> Messages sorted by: <a href="date.html#171">[ date ]</a> <a href="thread.html#171">[ thread ]</a> <a href="subject.html#171">[ subject ]</a> <a href="author.html#171">[ author ]</a> </LI> </UL> <hr> <a href="https://secure.aes.org/mailman/listinfo/sc-04-08">More information about the SC-04-08 mailing list</a> 

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<TITLE> [SC-04-08] x216 - MLS properties </TITLE> pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } <H1>[SC-04-08] x216 - MLS properties</H1> John Woodgate <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20x216%20-%20MLS%20properties&In-Reply-To=%3CWC3k9tFCa8YTFw10%40jmwa.demon.co.uk%3E" TITLE="[SC-04-08] x216 - MLS properties">jmw at jmwa.demon.co.uk </A> Fri May 2 10:23:30 MDT 2014 <UL> <LI>Previous message: <A HREF="000172.html">[SC-04-08] x216 - MLS properties </A></li> <LI>Next message: <A HREF="000174.html">[SC-04-08] AES-X216 Pink noise </A></li> <LI> Messages sorted by: <a href="date.html#173">[ date ]</a> <a href="thread.html#173">[ thread ]</a> <a href="subject.html#173">[ subject ]</a> <a href="author.html#173">[ author ]</a> </LI> </UL> <HR>  <PRE>In message <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">7BDF0AA9-8584-4CEB-84E1-DF6FA7FA926F at aes.org</A>>, dated Fri, 2 May 2014, Mark Yonge <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">standards at aes.org</A>> writes: >I am forwarding here a message from Thomas Lago, originally sent on 27 >April 2014. Because it contained an attachment, it had been held by >the reflector server for moderation. > >I have posted the attachment directly to the SC-04-08 document site >with the filename: > x216-140427-tl-mls-properties.pdf > >A direct login is available at: > <A HREF="https://secure.aes.org/standards/documents/?ID=91">https://secure.aes.org/standards/documents/?ID=91</A> I doubt that anyone will significantly disagree with the words. I seem to remember that table of taps from long ago and someone finding an error in it, but that is of no real significance. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk Nondum ex silvis sumus John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK </PRE>  <HR> <UL>  <LI>Previous message: <A HREF="000172.html">[SC-04-08] x216 - MLS properties </A></li> <LI>Next message: <A HREF="000174.html">[SC-04-08] AES-X216 Pink noise </A></li> <LI> Messages sorted by: <a href="date.html#173">[ date ]</a> <a href="thread.html#173">[ thread ]</a> <a href="subject.html#173">[ subject ]</a> <a href="author.html#173">[ author ]</a> </LI> </UL> <hr> <a href="https://secure.aes.org/mailman/listinfo/sc-04-08">More information about the SC-04-08 mailing list</a> 

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<TITLE> [SC-04-08] AES-X216 Pink noise </TITLE> pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } <H1>[SC-04-08] AES-X216 Pink noise</H1> Pete Soper <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20AES-X216%20Pink%20noise&In-Reply-To=%3C2BE563BCBE473946A8E72AE261D4F64BE7A9D763%40XCHG2.ms.msli.com%3E" TITLE="[SC-04-08] AES-X216 Pink noise">psoper at meyersound.com </A> Fri May 9 16:11:15 MDT 2014 <UL> <LI>Previous message: <A HREF="000173.html">[SC-04-08] x216 - MLS properties </A></li> <LI>Next message: <A HREF="000175.html">[SC-04-08] AES-X216 Pink noise </A></li> <LI> Messages sorted by: <a href="date.html#174">[ date ]</a> <a href="thread.html#174">[ thread ]</a> <a href="subject.html#174">[ subject ]</a> <a href="author.html#174">[ author ]</a> </LI> </UL> <HR>  <PRE>Hello, I apologize for not being able to call in or attend the meetings in Berlin, but I did get one report that some "serious issues" were raised with regards to the Pink Noise work in X216, however no details of these "serious issues" have been communicated and I have yet to see published minutes from the meeting. The SMPTE Pink Noise Ad-hoc group is meeting next week and it would be very much helpful if some more formal comments or feedback from the Berlin meeting could be brought to this group for their consideration. Thank you and best regards -Pete Soper NOTICE: This email may contain confidential information. Please see <A HREF="http://www.meyersound.com/confidential/">http://www.meyersound.com/confidential/</A> for our complete policy. </PRE>  <HR> <UL>  <LI>Previous message: <A HREF="000173.html">[SC-04-08] x216 - MLS properties </A></li> <LI>Next message: <A HREF="000175.html">[SC-04-08] AES-X216 Pink noise </A></li> <LI> Messages sorted by: <a href="date.html#174">[ date ]</a> <a href="thread.html#174">[ thread ]</a> <a href="subject.html#174">[ subject ]</a> <a href="author.html#174">[ author ]</a> </LI> </UL> <hr> <a href="https://secure.aes.org/mailman/listinfo/sc-04-08">More information about the SC-04-08 mailing list</a> 

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<TITLE> [SC-04-08] AES-X216 Pink noise </TITLE> pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } <H1>[SC-04-08] AES-X216 Pink noise</H1> John Woodgate <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20AES-X216%20Pink%20noise&In-Reply-To=%3CplEbEdAC5abTFwp%2B%40jmwa.demon.co.uk%3E" TITLE="[SC-04-08] AES-X216 Pink noise">jmw at jmwa.demon.co.uk </A> Fri May 9 22:42:42 MDT 2014 <UL> <LI>Previous message: <A HREF="000174.html">[SC-04-08] AES-X216 Pink noise </A></li> <LI>Next message: <A HREF="000176.html">[SC-04-08] AES-X216 Pink noise </A></li> <LI> Messages sorted by: <a href="date.html#175">[ date ]</a> <a href="thread.html#175">[ thread ]</a> <a href="subject.html#175">[ subject ]</a> <a href="author.html#175">[ author ]</a> </LI> </UL> <HR>  <PRE>In message <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">2BE563BCBE473946A8E72AE261D4F64BE7A9D763 at XCHG2.ms.msli.com</A>>, dated Fri, 9 May 2014, Pete Soper <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">psoper at meyersound.com</A>> writes: >I apologize for not being able to call in or attend the meetings in >Berlin, but I did get one report that some "serious issues" were raised >with regards to the Pink Noise work in X216, however no details of >these "serious issues" have been communicated and I have yet to see >published minutes from the meeting. Informally, I can tell you that my investigation of many noise samples has disclosed unexpected differences between them. The interpretation of these differences will, in some cases, require further study. In the mean time, my recommendation would be to specify particular sources of pink noise, with demonstrated well-behaved spectra, Gaussian APDs and no other apparent idiosyncrasies. > >The SMPTE Pink Noise Ad-hoc group is meeting next week and it would be >very much helpful if some more formal comments or feedback from the >Berlin meeting could be brought to this group for their consideration. My unfinished report on the noise samples has reached 5 MB, so I am splitting it into two documents. I *may* have it completed by Monday. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk Nondum ex silvis sumus John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK </PRE>  <HR> <UL>  <LI>Previous message: <A HREF="000174.html">[SC-04-08] AES-X216 Pink noise </A></li> <LI>Next message: <A HREF="000176.html">[SC-04-08] AES-X216 Pink noise </A></li> <LI> Messages sorted by: <a href="date.html#175">[ date ]</a> <a href="thread.html#175">[ thread ]</a> <a href="subject.html#175">[ subject ]</a> <a href="author.html#175">[ author ]</a> </LI> </UL> <hr> <a href="https://secure.aes.org/mailman/listinfo/sc-04-08">More information about the SC-04-08 mailing list</a> 

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<TITLE> [SC-04-08] AES-X216 Pink noise </TITLE> pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } <H1>[SC-04-08] AES-X216 Pink noise</H1> david murphy <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20AES-X216%20Pink%20noise&In-Reply-To=%3CDC98EF6CF2F08F40AA5AA23B3509EDA97EDF23CB23%40KRIX-DC.Krix.local%3E" TITLE="[SC-04-08] AES-X216 Pink noise">dmurphy at krix.com.au </A> Sat May 10 06:05:48 MDT 2014 <UL> <LI>Previous message: <A HREF="000175.html">[SC-04-08] AES-X216 Pink noise </A></li> <LI>Next message: <A HREF="000177.html">[SC-04-08] Report of the Berlin meeting, 2014-04-27 </A></li> <LI> Messages sorted by: <a href="date.html#176">[ date ]</a> <a href="thread.html#176">[ thread ]</a> <a href="subject.html#176">[ subject ]</a> <a href="author.html#176">[ author ]</a> </LI> </UL> <HR>  <PRE>Keep up the good work! cheers David ________________________________________ From: <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-bounces at standards.aes.org</A> [<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-bounces at standards.aes.org</A>] On Behalf Of John Woodgate [<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">jmw at jmwa.demon.co.uk</A>] Sent: Saturday, 10 May 2014 2:12 PM To: Working group on Measurement and equalization of sound systems in rooms Subject: Re: [SC-04-08] AES-X216 Pink noise In message <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">2BE563BCBE473946A8E72AE261D4F64BE7A9D763 at XCHG2.ms.msli.com</A>>, dated Fri, 9 May 2014, Pete Soper <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">psoper at meyersound.com</A>> writes: >I apologize for not being able to call in or attend the meetings in >Berlin, but I did get one report that some "serious issues" were raised >with regards to the Pink Noise work in X216, however no details of >these "serious issues" have been communicated and I have yet to see >published minutes from the meeting. Informally, I can tell you that my investigation of many noise samples has disclosed unexpected differences between them. The interpretation of these differences will, in some cases, require further study. In the mean time, my recommendation would be to specify particular sources of pink noise, with demonstrated well-behaved spectra, Gaussian APDs and no other apparent idiosyncrasies. > >The SMPTE Pink Noise Ad-hoc group is meeting next week and it would be >very much helpful if some more formal comments or feedback from the >Berlin meeting could be brought to this group for their consideration. My unfinished report on the noise samples has reached 5 MB, so I am splitting it into two documents. I *may* have it completed by Monday. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk Nondum ex silvis sumus John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK _______________________________________________ SC-04-08 mailing list <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">SC-04-08 at standards.aes.org</A> <<A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A>> </PRE>  <HR> <UL>  <LI>Previous message: <A HREF="000175.html">[SC-04-08] AES-X216 Pink noise </A></li> <LI>Next message: <A HREF="000177.html">[SC-04-08] Report of the Berlin meeting, 2014-04-27 </A></li> <LI> Messages sorted by: <a href="date.html#176">[ date ]</a> <a href="thread.html#176">[ thread ]</a> <a href="subject.html#176">[ subject ]</a> <a href="author.html#176">[ author ]</a> </LI> </UL> <hr> <a href="https://secure.aes.org/mailman/listinfo/sc-04-08">More information about the SC-04-08 mailing list</a> 

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<TITLE> [SC-04-08] Report of the Berlin meeting, 2014-04-27 </TITLE> pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } <H1>[SC-04-08] Report of the Berlin meeting, 2014-04-27</H1> Mark Yonge <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20Report%20of%20the%20Berlin%20meeting%2C%202014-04-27&In-Reply-To=%3C87E12950-9A46-4DFE-BFBD-EB52466CCEA2%40aes.org%3E" TITLE="[SC-04-08] Report of the Berlin meeting, 2014-04-27">standards at aes.org </A> Mon May 12 05:05:47 MDT 2014 <UL> <LI>Previous message: <A HREF="000176.html">[SC-04-08] AES-X216 Pink noise </A></li> <LI>Next message: <A HREF="000178.html">[SC-04-08] Report of the Berlin meeting, 2014-04-27 </A></li> <LI> Messages sorted by: <a href="date.html#177">[ date ]</a> <a href="thread.html#177">[ thread ]</a> <a href="subject.html#177">[ subject ]</a> <a href="author.html#177">[ author ]</a> </LI> </UL> <HR>  <PRE>Dear SC-04-08, Please find below the report of working-group chairman Ben Kok on the meeting held in Berlin on 2014-04-27. ********** Report of the meeting of the SC-04-08 Working Group on Measurement of sound systems in rooms of the SC-04 Subcommittee on Acoustics, held in Berlin, 2014-04-27 The meeting was convened by chair B. Kok. The chair welcomed those present at this meeting of SC-04-08, both physically and remotely using the Internet. The meeting included representatives from relevant SMPTE engineering groups. The agenda were accepted as written. There were no comments on the notes of the previous meeting in New York, 2013-10-18 Development Projects AES-X215 Liaison with SMPTE project to codify current procedures to calibrate the Cinema B-Chain Scope: "This project will liaise with SMPTE TC-25CSS in their project to Codify current procedures as used by skilled theater technicians to calibrate the Cinema B-Chain. The project will consider comments as appropriate for communication to SMPTE". The meeting understood that a report from SMPTE is expected soon AES-X216 Liaison with SMPTE project on Calibration Pink-Noise Standard and Test File Scope: "This project will liaise with SMPTE TC-25CSS in their project to “Create a pink-noise standard, and a reference pink-noise file available in a digital audio file and DCP formats that conform to the description of the pink noise in ST 202:2010 and RP 200-2012 and for which the time domain (mean, standard deviation, skew, kurtosis, etc.) and frequency domain (energy per bandwidth, bandwidth, etc.) characteristics are defined. Specify the algorithm used to generate the pink-noise file.” The project will consider comments as appropriate for communication to SMPTE. There was a substantial discussion of the content of a pink-noise signal suitable for these calibration purposes. A pseudo-random sequence of about 10s seemed reasonable. Shorter sequences will be audibly repetitive. Longer sequences prevent predictably-rapid settling of the meter. A crest factor of 12 dB was felt to relate closely to practical conditions and should also be straightforward to implement. G. Hill pointed out that for a given sequence length there are multiple MLS sequences. These sequences may sound different, but will have the same spectral properties over the overall length. However, if the analysis does not consider the sequence length, then the inherent predictability of MLS cannot be guaranteed. This led to an extensive discussion on the desired sequence length. It was recognized that a longer sequence is beneficial with regards to the audibility of the repetition rate and the frequency resolution. At the same time, it might show that sub-sets of (long) PRN sequences will exhibit a variation of the spectral content and thus result in poor repeatability. Thus with regards to repeatability it is beneficial to use a sequence length which is short with regards to the integration time of the applied meter. J. Woodgate argued for a near-Gaussian probability density function to make the audible content predictable. It was proposed that a bandwidth of 20 - 20kHz is good for a full-range system. lower frequencies could be reserved separately for subwoofer measurements . (Infrasonic content in main-channel PN may prejudice performance measurements of the full-range systems). The chairman proposed: repeated iterations of a pseudo-random sequence, sequence length to be further defined, near-Gaussian probability density function, pinked, 20 - 20kHz band limited, 12dB crest factor, will give a good result. Could be generated by an MLS, but other PRN certainly need to be investigated. With regards to the sequence length it has to be noted that a 10 s sequence seems acceptable with regards to audibility of the repetition rate. However, it has to be investigated what the influence of this sequence length is on the stability of the reading over time on a SLM or RTA at position “slow” (running integration time of 1 s), particularly at low frequencies. The meeting understood that the SMPTE group had identified a pink-noise signal. The chairman would like to see the proposed SMPTE test signal to confirm stability of the reading over time. Propose to generate a liaison letter to SMPTE following this meeting. AES-X218 Measurement and calibration of sound systems in rooms Scope: “to document relevant parameters affecting the audience experience of a sound system in a generalized room, and identify appropriate objective methods of measurements to quantify them. The intent is to identify tools and procedures for a technician to measure the performance of a loudspeaker system in a room, and then support accurate and reliable calibration of this system to a specified performance.” The meeting was urged to comment on the Nordtest document, "NT ACOU 108" in preparation for developing this project. AES-X219 Method of measurement for frequency and impulse response of sound systems in auditoria Scope:" to specify a method of measurement for frequency and impulse response of sound systems in auditoria". A scope for this project awaits refinement in project AES-X218. Liaisons No liaison matters arose. New Projects No new projects were proposed. New Business There was no new business. Date of next meeting The next meeting will be scheduled in conjunction with the AES 137th Convention in Los Angeles, 2014-10 </PRE>  <HR> <UL>  <LI>Previous message: <A HREF="000176.html">[SC-04-08] AES-X216 Pink noise </A></li> <LI>Next message: <A HREF="000178.html">[SC-04-08] Report of the Berlin meeting, 2014-04-27 </A></li> <LI> Messages sorted by: <a href="date.html#177">[ date ]</a> <a href="thread.html#177">[ thread ]</a> <a href="subject.html#177">[ subject ]</a> <a href="author.html#177">[ author ]</a> </LI> </UL> <hr> <a href="https://secure.aes.org/mailman/listinfo/sc-04-08">More information about the SC-04-08 mailing list</a> 

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<TITLE> [SC-04-08] Report of the Berlin meeting, 2014-04-27 </TITLE> pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } <H1>[SC-04-08] Report of the Berlin meeting, 2014-04-27</H1> Thomas Lagö <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20Report%20of%20the%20Berlin%20meeting%2C%202014-04-27&In-Reply-To=%3CBLU436-SMTP1344E2431D9A91CB3908731CC350%40phx.gbl%3E" TITLE="[SC-04-08] Report of the Berlin meeting, 2014-04-27">thomaslago at msn.com </A> Mon May 12 07:14:16 MDT 2014 <UL> <LI>Previous message: <A HREF="000177.html">[SC-04-08] Report of the Berlin meeting, 2014-04-27 </A></li> <LI>Next message: <A HREF="000179.html">[SC-04-08] Assessment of white and pink noise signals </A></li> <LI> Messages sorted by: <a href="date.html#178">[ date ]</a> <a href="thread.html#178">[ thread ]</a> <a href="subject.html#178">[ subject ]</a> <a href="author.html#178">[ author ]</a> </LI> </UL> <HR>  <PRE>Dear All, Thanks for the report. I recommend all to read my submitted PDF file in regards to MLS sequences. It follows the G. Hill’s comment almost 100% but extends this discussion. I can be valuable. I you do not have this file, let me know and I will send a copy. Best regards, Thomas Lagö On 12 May 2014, at 13:05, Mark Yonge <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">standards at aes.org</A>> wrote: > Dear SC-04-08, > > Please find below the report of working-group chairman Ben Kok on the meeting held in Berlin on 2014-04-27. > > > ********** > Report of the meeting of the SC-04-08 Working Group on Measurement of sound systems in rooms of the SC-04 Subcommittee on Acoustics, held in Berlin, 2014-04-27 > > The meeting was convened by chair B. Kok. > > The chair welcomed those present at this meeting of SC-04-08, both physically and remotely using the Internet. The meeting included representatives from relevant SMPTE engineering groups. > > The agenda were accepted as written. > > There were no comments on the notes of the previous meeting in New York, 2013-10-18 > > Development Projects > > AES-X215 Liaison with SMPTE project to codify current procedures to calibrate the Cinema B-Chain > Scope: "This project will liaise with SMPTE TC-25CSS in their project to Codify current procedures as used by skilled theater technicians to calibrate the Cinema B-Chain. The project will consider comments as appropriate for communication to SMPTE". > > The meeting understood that a report from SMPTE is expected soon > > > AES-X216 Liaison with SMPTE project on Calibration Pink-Noise Standard and Test File > Scope: "This project will liaise with SMPTE TC-25CSS in their project to “Create a pink-noise standard, and a reference pink-noise file available in a digital audio file and DCP formats that conform to the description of the pink noise in ST 202:2010 and RP 200-2012 and for which the time domain (mean, standard deviation, skew, kurtosis, etc.) and frequency domain (energy per bandwidth, bandwidth, etc.) characteristics are defined. Specify the algorithm used to generate the pink-noise file.” The project will consider comments as appropriate for communication to SMPTE. > > There was a substantial discussion of the content of a pink-noise signal suitable for these calibration purposes. > > A pseudo-random sequence of about 10s seemed reasonable. Shorter sequences will be audibly repetitive. Longer sequences prevent predictably-rapid settling of the meter. > > A crest factor of 12 dB was felt to relate closely to practical conditions and should also be straightforward to implement. > > G. Hill pointed out that for a given sequence length there are multiple MLS sequences. These sequences may sound different, but will have the same spectral properties over the overall length. However, if the analysis does not consider the sequence length, then the inherent predictability of MLS cannot be guaranteed. > > This led to an extensive discussion on the desired sequence length. It was recognized that a longer sequence is beneficial with regards to the audibility of the repetition rate and the frequency resolution. At the same time, it might show that sub-sets of (long) PRN sequences will exhibit a variation of the spectral content and thus result in poor repeatability. Thus with regards to repeatability it is beneficial to use a sequence length which is short with regards to the integration time of the applied meter. > > J. Woodgate argued for a near-Gaussian probability density function to make the audible content predictable. > > It was proposed that a bandwidth of 20 - 20kHz is good for a full-range system. lower frequencies could be reserved separately for subwoofer measurements . (Infrasonic content in main-channel PN may prejudice performance measurements of the full-range systems). > > The chairman proposed: repeated iterations of a pseudo-random sequence, sequence length to be further defined, near-Gaussian probability density function, pinked, 20 - 20kHz band limited, 12dB crest factor, will give a good result. Could be generated by an MLS, but other PRN certainly need to be investigated. > With regards to the sequence length it has to be noted that a 10 s sequence seems acceptable with regards to audibility of the repetition rate. However, it has to be investigated what the influence of this sequence length is on the stability of the reading over time on a SLM or RTA at position “slow” (running integration time of 1 s), particularly at low frequencies. > > The meeting understood that the SMPTE group had identified a pink-noise signal. The chairman would like to see the proposed SMPTE test signal to confirm stability of the reading over time. > > Propose to generate a liaison letter to SMPTE following this meeting. > > > AES-X218 Measurement and calibration of sound systems in rooms > Scope: “to document relevant parameters affecting the audience experience of a sound system in a generalized room, and identify appropriate objective methods of measurements to quantify them. The intent is to identify tools and procedures for a technician to measure the performance of a loudspeaker system in a room, and then support accurate and reliable calibration of this system to a specified performance.” > > The meeting was urged to comment on the Nordtest document, "NT ACOU 108" in preparation for developing this project. > > > AES-X219 Method of measurement for frequency and impulse response of sound systems in auditoria > > Scope:" to specify a method of measurement for frequency and impulse response of sound systems in auditoria". > > A scope for this project awaits refinement in project AES-X218. > > Liaisons > No liaison matters arose. > > New Projects > No new projects were proposed. > > New Business > There was no new business. > > Date of next meeting > The next meeting will be scheduled in conjunction with the AES 137th Convention in Los Angeles, 2014-10 > > > > _______________________________________________ > SC-04-08 mailing list > <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">SC-04-08 at standards.aes.org</A> > <<A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A>> > </PRE>  <HR> <UL>  <LI>Previous message: <A HREF="000177.html">[SC-04-08] Report of the Berlin meeting, 2014-04-27 </A></li> <LI>Next message: <A HREF="000179.html">[SC-04-08] Assessment of white and pink noise signals </A></li> <LI> Messages sorted by: <a href="date.html#178">[ date ]</a> <a href="thread.html#178">[ thread ]</a> <a href="subject.html#178">[ subject ]</a> <a href="author.html#178">[ author ]</a> </LI> </UL> <hr> <a href="https://secure.aes.org/mailman/listinfo/sc-04-08">More information about the SC-04-08 mailing list</a> 

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<TITLE> [SC-04-08] Assessment of white and pink noise signals </TITLE> pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } <H1>[SC-04-08] Assessment of white and pink noise signals</H1> John Woodgate <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20Assessment%20of%20white%20and%20pink%20noise%20signals&In-Reply-To=%3C9mMuEPFe5YkTFwz3%40jmwa.demon.co.uk%3E" TITLE="[SC-04-08] Assessment of white and pink noise signals">jmw at jmwa.demon.co.uk </A> Fri Jun 6 03:48:14 MDT 2014 <UL> <LI>Previous message: <A HREF="000178.html">[SC-04-08] Report of the Berlin meeting, 2014-04-27 </A></li> <LI>Next message: <A HREF="000180.html">[SC-04-08] AES 137 In Los Angeles Fast Approaching </A></li> <LI> Messages sorted by: <a href="date.html#179">[ date ]</a> <a href="thread.html#179">[ thread ]</a> <a href="subject.html#179">[ subject ]</a> <a href="author.html#179">[ author ]</a> </LI> </UL> <HR>  <PRE>I have uploaded a zip archive x216woodgate_noises140606.zip to the reflector. It is in three parts because the graphics are high-resolution so that they can be zoomed to read in detail. Mark: The web site wouldn't accept a filename longer than the above. Files with much longer filenames have been uploaded previously. If this restriction is an 'improvement', it makes it almost impossible to use a meaningful filename, since so many characters are taken up by the project number, author, date and extension. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk Quid faciamus nisi sit? John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK </PRE>  <HR> <UL>  <LI>Previous message: <A HREF="000178.html">[SC-04-08] Report of the Berlin meeting, 2014-04-27 </A></li> <LI>Next message: <A HREF="000180.html">[SC-04-08] AES 137 In Los Angeles Fast Approaching </A></li> <LI> Messages sorted by: <a href="date.html#179">[ date ]</a> <a href="thread.html#179">[ thread ]</a> <a href="subject.html#179">[ subject ]</a> <a href="author.html#179">[ author ]</a> </LI> </UL> <hr> <a href="https://secure.aes.org/mailman/listinfo/sc-04-08">More information about the SC-04-08 mailing list</a> 

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<TITLE> [SC-04-08] AES 137 In Los Angeles Fast Approaching </TITLE> pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } <H1>[SC-04-08] AES 137 In Los Angeles Fast Approaching</H1> Brian McCarty (RS) <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20AES%20137%20In%20Los%20Angeles%20Fast%20Approaching&In-Reply-To=%3C78CD103C-5707-4423-B442-40A205785F05%40coralseastudios.com%3E" TITLE="[SC-04-08] AES 137 In Los Angeles Fast Approaching">bmccarty at coralseastudios.com </A> Sun Aug 10 12:34:04 MDT 2014 <UL> <LI>Previous message: <A HREF="000179.html">[SC-04-08] Assessment of white and pink noise signals </A></li> <LI>Next message: <A HREF="000181.html">[SC-04-08] Revision of ITU-R BS.1116-2 </A></li> <LI> Messages sorted by: <a href="date.html#180">[ date ]</a> <a href="thread.html#180">[ thread ]</a> <a href="subject.html#180">[ subject ]</a> <a href="author.html#180">[ author ]</a> </LI> </UL> <HR>  <PRE>Greetings from Oz, AES 137 will be upon us before we know it. SC-04-08 is looking to be very busy at this Convention, and as co-chair of TC Sound for Digital Cinema and Television, I'm hoping we'll all be prepared to work through the growing list of issues. I support of AES-X218, Chair Ben Kok asked us to a document previously submitted to us, the NORDTEST METHOD in the hope that this could serve as a framework for the work we're doing. I've been working on some ideas that I'll be uploading to the group shortly. I look forward to reading more submissions as we move closer to our meeting date. As a member of the SMPTE committee working on the Cinema Testing report, I'm very hopeful that this document will be finalized by the SMPTE and available to us prior to our October meeting. The document is extremely detailed and comprehensive, and special kudos for this work to group Chair Neil Shaw and especially to Glenn Leembruggen. We also should expect a draft from the SMPTE Pink Noise committee in support of AES-X216, and hopefully work from the Cinema calibration group supporting AES-X215. I'd also like to remind the group of the 57th Conference in Hollywood, March 6-8 2015 - The Future of Audio Entertainment Technology for Cinema, Television, and the Internet. The Call for Contributions is already generating substantial response for this topic that has never before been covered by the AES in such a comprehensive way. I look forward to seeing everyone in Los Angeles in October. Brian McCarty Chair TC-SDCTV </PRE>  <HR> <UL>  <LI>Previous message: <A HREF="000179.html">[SC-04-08] Assessment of white and pink noise signals </A></li> <LI>Next message: <A HREF="000181.html">[SC-04-08] Revision of ITU-R BS.1116-2 </A></li> <LI> Messages sorted by: <a href="date.html#180">[ date ]</a> <a href="thread.html#180">[ thread ]</a> <a href="subject.html#180">[ subject ]</a> <a href="author.html#180">[ author ]</a> </LI> </UL> <hr> <a href="https://secure.aes.org/mailman/listinfo/sc-04-08">More information about the SC-04-08 mailing list</a> 

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