​

   <TITLE> [SC-04-08] Comments and Summary Further Comments on issues raised by Julius Newell by David Murphy

   </TITLE>

       pre {

           white-space: pre-wrap;       /* css-2.1, curent FF, Opera, Safari */

           }

   <H1>[SC-04-08] Comments and Summary Further Comments on issues raised by Julius Newell by David Murphy</H1>

    <B>philip newell</B> 

    <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20Comments%20and%20Summary%20Further%20Comments%20on%20issues%0A%20raised%20by%20Julius%20Newell%20by%20David%20Murphy&In-Reply-To=%3CCAEEhACkMZ%3DvAbCs%2BXHs9LWd4cA%3DAKhrKU1%3DfuQ6p98neM%3DKERA%40mail.gmail.com%3E" TITLE="[SC-04-08] Comments and Summary Further Comments on issues raised by Julius Newell by David Murphy">philiprnewell at gmail.com

       </A><BR>

    <I>Thu Jan 19 11:25:27 EST 2017</I>

    <P><UL>

        <LI>Previous message: <A HREF="000381.html">[SC-04-08] Comments and Summary Further Comments on issues  raised by Julius Newell by David Murphy

</A></li>

        <LI>Next message: <A HREF="000382.html">[SC-04-08] Comments and Summary Further Comments on issues raised by Julius Newell by David Murphy

</A></li>

         <LI> <B>Messages sorted by:</B> 

              <a href="date.html#386">[ date ]</a>

              <a href="thread.html#386">[ thread ]</a>

              <a href="subject.html#386">[ subject ]</a>

              <a href="author.html#386">[ author ]</a>

         </LI>

       </UL>

    <HR>  

<!--beginarticle-->

<PRE>And just to remind anybody in this group who is not involved with cinema

sound, the unique thing about it (other than the X-curve) is that cinemas

are about the only form of mass entertainment via loudspeakers where nobody

is controlling either the volume or the equalisation during the entire

performance.

​

Whatever film, whatever audience, whatever time of day and whatever

weather, the calibration must serve for all.

​

​

                          Best wishes,

​

​

                                          Philip

​

​

​

On 19 January 2017 at 09:54, John Woodgate via SC-04-08 <

<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08 at standards.aes.org</A>> wrote:

​

><i>  If we accept that we need to measure the direct sound, we can measure

</I>><i> that much

</I>><i> closer to the loudspeaker with a calibrated directional microphone to

</I>><i> reduce

</I>><i> reflections. By definition, the room does not affect the direct sound, but

</I>><i> of

</I>><i> course it is attenuated by distance.

</I>><i>

</I>><i> Having done that, we can then measure at the 2/3 point to see what

</I>><i> changed, and

</I>><i> perhaps why.

</I>><i>

</I>><i> Maybe this is over-simplified, but I'm not sure how.

</I>><i>

</I>><i> With best wishes DESIGN IT IN! OOO – Own Opinions Only

</I>><i> www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England

</I>><i>

</I>><i> Sylvae in aeternum manent.

</I>><i>

</I>><i> -----Original Message-----

</I>><i> From: SC-04-08 [mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-bounces at standards.aes.org</A>] On Behalf Of

</I>><i> david

</I>><i> murphy via SC-04-08

</I>><i> Sent: Thursday, January 19, 2017 12:39 AM

</I>><i> To: Brian McCarty <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">bmccarty at coralseastudios.com</A>>; Working group on

</I>><i> Measurement

</I>><i> 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>>;

</I>><i> Joules

</I>><i> Newell <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">joules at newellacousticengineering.com</A>>

</I>><i> Cc: Thomas Lagö <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">thomaslagoqirra at gmail.com</A>>; Peter Mapp <

</I>><i> <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">peter at petermapp.com</A>>;

</I>><i> Robinson, Charles Q <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">cqr at dolby.com</A>>; Floyd Toole <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">soundnwine at sbcglobal.net</A>

</I>><i> >;

</I>><i> <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">rich at xfrm.com</A>

</I>><i> Subject: Re: [SC-04-08] Comments and Summary Further Comments on issues

</I>><i> raised

</I>><i> by Julius Newell by David Murphy

</I>><i>

</I>><i> Hi all,

</I>><i> SMPTE 2096-1

</I>><i>

</I>><i> I note Julius’s comments with interest. Certainly the length and shape of

</I>><i> the

</I>><i> window applied to the impulse response determines the shape of the low

</I>><i> frequency

</I>><i> response. To obtain a meaningful low frequency response the time window

</I>><i> needs to

</I>><i> be at least as long as a full cycle of the frequency concerned [Thomas, be

</I>><i> gentle with me :-)] and in many rooms that time length will include

</I>><i> reflections.

</I>><i> Trying to disentangle the room contribution by spatial averaging is

</I>><i> hopeful at

</I>><i> best.

</I>><i>

</I>><i> The real problem is that we are trying to measure the frequency response

</I>><i> of a

</I>><i> loudspeaker at the other end of the room (2/3 back) and we are on a hiding

</I>><i> to

</I>><i> nothing.

</I>><i>

</I>><i> If we accept the proposition that the direct sound from a loudspeaker has

</I>><i> the

</I>><i> most influence on how it is perceived, ie, the ear-brain can apprise the

</I>><i> sound

</I>><i> quality by ‘hearing through’ the effects of the room (concrete bunkers

</I>><i> excepted)

</I>><i> then we need to try to measure the direct sound from the loudspeaker and

</I>><i> work to

</I>><i> make that as smooth as possible. Certainly the decades of research by Floyd

</I>><i> Toole indicates that people can reliably distinguish small variations in

</I>><i> the

</I>><i> measured characteristics of the loudspeaker independently of the listening

</I>><i> room.

</I>><i> So, given the geometry of a typical cinema, and a spatial array of

</I>><i> microphones

</I>><i> around the 2/3 back region, there will be floor and ceiling reflections and

</I>><i> early side wall reflections. If we have a window of 20 msecs to measure

</I>><i> down to

</I>><i> 50Hz, these early reflections will be evident in the tail of the impulse

</I>><i> response, and create sum and difference variations in the frequency

</I>><i> response.

</I>><i> These will still be evident even with a spatial array of microphones

</I>><i> because the

</I>><i> array would be smaller than the wavelength of the low frequency. Typical

</I>><i> numbers

</I>><i> would be a 20 msec window to measure down to 50Hz, wavelength of which is

</I>><i> ~6.9

</I>><i> metres. A time window from first arrival to 20msecs later will include

</I>><i> several

</I>><i> reflections, making it very difficult to ‘see’ the actual response at low

</I>><i> frequencies.

</I>><i> In essence, to measure the frequency response of the loudspeaker you have

</I>><i> to be

</I>><i> closer to it than the natural boundaries of the room (floor, ceiling,

</I>><i> sidewalls), but far enough away that you comply with requirements for free

</I>><i> field

</I>><i> conditions. A working approximation is four times the largest dimension of

</I>><i> the

</I>><i> loudspeaker. Please refer to my earlier upload, showing a diagram of a

</I>><i> microphone on a tall stand positioned in front of the screen but several

</I>><i> metres

</I>><i> back.

</I>><i> Anyway, it will be interesting to see if SMPTE takes on board our comments.

</I>><i> Regards to all

</I>><i> David

</I>><i>

</I>><i>

</I>><i>

</I>><i>

</I>><i>

</I>><i>

</I>><i> David Murphy

</I>><i> Loudspeaker Design Engineer

</I>><i> Commercial Cinema

</I>><i>

</I>><i> Krix

</I>><i> 14 Chapman Road | Hackham SA 5163 | Australia

</I>><i> T +618 83843433 | F +618 83843419

</I>><i> Email: <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">dmurphy at krix.com</A> | Web: www.krix.com

</I>><i>

</I>><i>

</I>><i>

</I>><i> DISCLAIMER:

</I>><i> This email and any files transmitted with it are confidential to the

</I>><i> intended

</I>><i> recipient and may be privileged. If you are not the intended recipient,

</I>><i> please

</I>><i> notify Krix immediately. Whilst we have used software to alert us to the

</I>><i> presence of computer viruses, we cannot guarantee that this email and any

</I>><i> files

</I>><i> transmitted with it are free from them.

</I>><i> ________________________________________

</I>><i> From: SC-04-08 [<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-bounces at standards.aes.org</A>] On Behalf Of Brian

</I>><i> McCarty

</I>><i> via SC-04-08 [<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08 at standards.aes.org</A>]

</I>><i> Sent: Tuesday, 17 January 2017 11:11 AM

</I>><i> To: Joules Newell; Worki...

​

   <TITLE> [SC-04-08] Comments and Summary Further Comments on issues raised by Julius Newell by David Murphy

   </TITLE>

       pre {

           white-space: pre-wrap;       /* css-2.1, curent FF, Opera, Safari */

           }

   <H1>[SC-04-08] Comments and Summary Further Comments on issues raised by Julius Newell by David Murphy</H1>

    <B>david murphy</B> 

    <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20Comments%20and%20Summary%20Further%20Comments%20on%20issues%0A%20raised%20by%20Julius%20Newell%20by%20David%20Murphy&In-Reply-To=%3CDC98EF6CF2F08F40AA5AA23B3509EDA982B8D68D9A%40KRIX-DC.Krix.local%3E" TITLE="[SC-04-08] Comments and Summary Further Comments on issues raised by Julius Newell by David Murphy">dmurphy at krix.com.au

       </A><BR>

    <I>Thu Jan 19 16:23:24 EST 2017</I>

    <P><UL>

        <LI>Previous message: <A HREF="000383.html">[SC-04-08] Comments and Summary Further Comments on issues raised by Julius Newell by David Murphy

</A></li>

        <LI>Next message: <A HREF="000385.html">[SC-04-08] Comments and Summary Further Comments on issues raised by Julius Newell by David Murphy

</A></li>

         <LI> <B>Messages sorted by:</B> 

              <a href="date.html#387">[ date ]</a>

              <a href="thread.html#387">[ thread ]</a>

              <a href="subject.html#387">[ subject ]</a>

              <a href="author.html#387">[ author ]</a>

         </LI>

       </UL>

    <HR>  

<!--beginarticle-->

<PRE>Hi all,

in  riposte to John Woodgate, in my experience the sound system calibration is usually done in a mad rush while they are filling the pop corn machines and people are waiting in the foyer of the brand new mullitplex. No pressure - ha! Everything takes longer and costs more - another version of Murphy's Law.

So the technicians are usually pushed for time - even setting out as many as 5 microphones takes too long, never mind moving them, etc.

​

Anyway, as Geoff Hill says, we've done our bit - over to SMPTE...

Good to read all the opinions

Warm regards

David

​

​

​

David Murphy

Loudspeaker Design Engineer

Commercial Cinema

​

Krix

14 Chapman Road | Hackham SA 5163 | Australia

T +618 83843433 | F +618 83843419

Email: <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">dmurphy at krix.com</A> | Web: www.krix.com

​

​

​

DISCLAIMER:

This email and any files transmitted with it are confidential to the intended recipient and may be privileged. If you are not the intended recipient, please notify Krix immediately. Whilst we have used software to alert us to the presence of computer viruses, we cannot guarantee that this email and any files transmitted with it are free from them.

________________________________________

From: John Woodgate [<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">jmw1937 at btinternet.com</A>]

Sent: Thursday, 19 January 2017 7:24 PM

To: david murphy; 'Working group on Measurement and equalization of sound systems in    rooms'; 'Brian McCarty'; 'Joules Newell'

Cc: 'Thomas Lagö'; 'Peter Mapp'; 'Robinson, Charles Q'; 'Floyd Toole'; <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">rich at xfrm.com</A>

Subject: RE: [SC-04-08] Comments and Summary Further Comments on issues raised by Julius Newell by David Murphy

​

 If we accept that we need to measure the direct sound, we can measure that much

closer to the loudspeaker with a calibrated directional microphone to reduce

reflections. By definition, the room does not affect the direct sound, but of

course it is attenuated by distance.

​

Having done that, we can then measure at the 2/3 point to see what changed, and

perhaps why.

​

Maybe this is over-simplified, but I'm not sure how.

​

With best wishes DESIGN IT IN! OOO – Own Opinions Only

www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England

​

Sylvae in aeternum manent.

​

-----Original Message-----

From: SC-04-08 [mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-bounces at standards.aes.org</A>] On Behalf Of david

murphy via SC-04-08

Sent: Thursday, January 19, 2017 12:39 AM

To: Brian McCarty <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">bmccarty at coralseastudios.com</A>>; 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>>; Joules

Newell <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">joules at newellacousticengineering.com</A>>

Cc: Thomas Lagö <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">thomaslagoqirra at gmail.com</A>>; Peter Mapp <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">peter at petermapp.com</A>>;

Robinson, Charles Q <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">cqr at dolby.com</A>>; Floyd Toole <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">soundnwine at sbcglobal.net</A>>;

<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">rich at xfrm.com</A>

Subject: Re: [SC-04-08] Comments and Summary Further Comments on issues raised

by Julius Newell by David Murphy

​

Hi all,

SMPTE 2096-1

​

I note Julius’s comments with interest. Certainly the length and shape of the

window applied to the impulse response determines the shape of the low frequency

response. To obtain a meaningful low frequency response the time window needs to

be at least as long as a full cycle of the frequency concerned [Thomas, be

gentle with me :-)] and in many rooms that time length will include reflections.

Trying to disentangle the room contribution by spatial averaging is hopeful at

best.

​

The real problem is that we are trying to measure the frequency response of a

loudspeaker at the other end of the room (2/3 back) and we are on a hiding to

nothing.

​

If we accept the proposition that the direct sound from a loudspeaker has the

most influence on how it is perceived, ie, the ear-brain can apprise the sound

quality by ‘hearing through’ the effects of the room (concrete bunkers excepted)

then we need to try to measure the direct sound from the loudspeaker and work to

make that as smooth as possible. Certainly the decades of research by Floyd

Toole indicates that people can reliably distinguish small variations in the

measured characteristics of the loudspeaker independently of the listening room.

So, given the geometry of a typical cinema, and a spatial array of microphones

around the 2/3 back region, there will be floor and ceiling reflections and

early side wall reflections. If we have a window of 20 msecs to measure down to

50Hz, these early reflections will be evident in the tail of the impulse

response, and create sum and difference variations in the frequency response.

These will still be evident even with a spatial array of microphones because the

array would be smaller than the wavelength of the low frequency. Typical numbers

would be a 20 msec window to measure down to 50Hz, wavelength of which is ~6.9

metres. A time window from first arrival to 20msecs later will include several

reflections, making it very difficult to ‘see’ the actual response at low

frequencies.

In essence, to measure the frequency response of the loudspeaker you have to be

closer to it than the natural boundaries of the room (floor, ceiling,

sidewalls), but far enough away that you comply with requirements for free field

conditions. A working approximation is four times the largest dimension of the

loudspeaker. Please refer to my earlier upload, showing a diagram of a

microphone on a tall stand positioned in front of the screen but several metres

back.

Anyway, it will be interesting to see if SMPTE takes on board our comments.

Regards to all

David

​

​

​

​

​

​

David Murphy

Loudspeaker Design Engineer

Commercial Cinema

​

Krix

14 Chapman Road | Hackham SA 5163 | Australia

T +618 83843433 | F +618 83843419

Email: <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">dmurphy at krix.com</A> | Web: www.krix.com

​

​

​

DISCLAIMER:

This email and any files transmitted with it are confidential to the intended

recipient and may be privileged. If you are not the intended recipient, please

notify Krix immediately. Whilst we have used software to alert us to the

presence of computer viruses, we cannot guarantee that this email and any files

transmitted with it are free from them.

________________________________________

From: SC-04-08 [<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-bounces at standards.aes.org</A>] On Behalf Of Brian McCarty

via SC-04-08 [<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08 at standards.aes.org</A>]

Sent: Tuesday, 17 January 2017 11:11 AM

To: Joules Newell; Working group on Measurement and equalization of sound

systems in rooms

Cc: Thomas Lagö; Peter Mapp; Robinson, Charles Q; Floyd Toole; <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">rich at xfrm.com</A>

Subject: Re: [SC-04-08] Comments and Summary

​

Joules; SC-04–08:

​

These are very cogent comments, Joules.  I would opine that your experience

correlating the subjective results of room measurements with the measurements

themselves are second to none here.

​

With the deadline for comments back to the SMPTE approaching, I think we’ve

...

​

   <TITLE> [SC-04-08] Comments uploaded by David Murphy

   </TITLE>

       pre {

           white-space: pre-wrap;       /* css-2.1, curent FF, Opera, Safari */

           }

   <H1>[SC-04-08] Comments uploaded by David Murphy</H1>

    <B>Richard Cabot</B> 

    <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20Comments%20uploaded%20by%20David%20Murphy&In-Reply-To=%3C106E01DC1F8C4C8AA091BA58DB84125F%40RCC%3E" TITLE="[SC-04-08] Comments uploaded by David Murphy">rich at xfrm.com

       </A><BR>

    <I>Fri Jan 20 04:23:38 EST 2017</I>

    <P><UL>

        <LI>Previous message: <A HREF="000384.html">[SC-04-08] Comments uploaded by David Murphy

</A></li>

        <LI>Next message: <A HREF="000389.html">[SC-04-08] Comments uploaded by David Murphy

</A></li>

         <LI> <B>Messages sorted by:</B> 

              <a href="date.html#388">[ date ]</a>

              <a href="thread.html#388">[ thread ]</a>

              <a href="subject.html#388">[ subject ]</a>

              <a href="author.html#388">[ author ]</a>

         </LI>

       </UL>

    <HR>  

<!--beginarticle-->

<PRE>Thomas's document has been uploaded to the document repository as

x215-20170119-TLL-AES_FFT_Comments.pdf

​

It can be found at <A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A>

​

Rich Cabot

AES Standards Secretary

​

-----Original Message-----

From: SC-04-08 [mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-bounces at standards.aes.org</A>] On Behalf Of

Thomas Lago via SC-04-08

Sent: Sunday, January 15, 2017 12:12 AM

To: Joules Newell

Cc: Peter Mapp; Robinson, Charles Q; Charlie Hughes via SC-04-08

Subject: Re: [SC-04-08] Comments uploaded by David Murphy

​

Dear All,

​

Here comes an attempt to give some more info in regards to FFT, DFT, Gauss

etc. I am also covering windows in more detail. In the attached papers, I

have references to more info. Feel free to ask questions and I will try to

handle this as good as possible.

​

Best regards,

Dr. Thomas L. Lagö

Chief Scientist & Chairman

Cell Sweden: +46 708 357337

Cell USA: +1 479 571 0035

​

QirraSound Technologies Europe AB

Slagetorp 2, 57692 Sävsjö, Sweden

Manufacturing unit: QirraSound/VILAX, Tirupsvägen 9, 24593 Staffanstorp,

Sweden

<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">thomas.lago at qirrasound.com</A> <mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">thomas.lago at qirrasound.com</A>>

www.qirrasound.se <<A HREF="http://www.qirrasound.se/">http://www.qirrasound.se/</A>>

thomaslago.com <<A HREF="http://thomaslago.com/">http://thomaslago.com/</A>> 

​

_______________________________________________

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>

​

​

<!--endarticle-->

    <HR>

    <P><UL>

        <!--threads-->

    <LI>Previous message: <A HREF="000384.html">[SC-04-08] Comments uploaded by David Murphy

</A></li>

    <LI>Next message: <A HREF="000389.html">[SC-04-08] Comments uploaded by David Murphy

</A></li>

         <LI> <B>Messages sorted by:</B> 

              <a href="date.html#388">[ date ]</a>

              <a href="thread.html#388">[ thread ]</a>

              <a href="subject.html#388">[ subject ]</a>

              <a href="author.html#388">[ 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><br>

​

​

​

   <TITLE> [SC-04-08] Comments uploaded by David Murphy

   </TITLE>

       pre {

           white-space: pre-wrap;       /* css-2.1, curent FF, Opera, Safari */

           }

   <H1>[SC-04-08] Comments uploaded by David Murphy</H1>

    <B>Thomas Lagö</B> 

    <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20Comments%20uploaded%20by%20David%20Murphy&In-Reply-To=%3C01B1DDCA-FE48-493C-BF69-DD76F7565F5D%40msn.com%3E" TITLE="[SC-04-08] Comments uploaded by David Murphy">thomaslagoqirra at gmail.com

       </A><BR>

    <I>Fri Jan 20 04:28:05 EST 2017</I>

    <P><UL>

        <LI>Previous message: <A HREF="000388.html">[SC-04-08] Comments uploaded by David Murphy

</A></li>

        <LI>Next message: <A HREF="000390.html">[SC-04-08] Comments uploaded by David Murphy

</A></li>

         <LI> <B>Messages sorted by:</B> 

              <a href="date.html#389">[ date ]</a>

              <a href="thread.html#389">[ thread ]</a>

              <a href="subject.html#389">[ subject ]</a>

              <a href="author.html#389">[ author ]</a>

         </LI>

       </UL>

    <HR>  

<!--beginarticle-->

<PRE>Thanks! I will send another document this weekend in regards to proper FRF measurements in rooms using FFT analysis.

​

​

><i> On 20 Jan 2017, at 10:23, Richard Cabot via SC-04-08 <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08 at standards.aes.org</A>> wrote:

</I>><i> 

</I>><i> Thomas's document has been uploaded to the document repository as

</I>><i> x215-20170119-TLL-AES_FFT_Comments.pdf

</I>><i> 

</I>><i> It can be found at <A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A> <<A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A>>

</I>><i> 

</I>><i> Rich Cabot

</I>><i> AES Standards Secretary

</I>><i> 

</I>><i> 

</I>><i> -----Original Message-----

</I>><i> From: SC-04-08 [mailto:<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

</I>><i> Thomas Lago via SC-04-08

</I>><i> Sent: Sunday, January 15, 2017 12:12 AM

</I>><i> To: Joules Newell

</I>><i> Cc: Peter Mapp; Robinson, Charles Q; Charlie Hughes via SC-04-08

</I>><i> Subject: Re: [SC-04-08] Comments uploaded by David Murphy

</I>><i> 

</I>><i> Dear All,

</I>><i> 

</I>><i> Here comes an attempt to give some more info in regards to FFT, DFT, Gauss

</I>><i> etc. I am also covering windows in more detail. In the attached papers, I

</I>><i> have references to more info. Feel free to ask questions and I will try to

</I>><i> handle this as good as possible.

</I>><i> 

</I>><i> Best regards,

</I>><i> Dr. Thomas L. Lagö

</I>><i> Chief Scientist & Chairman

</I>><i> Cell Sweden: +46 708 357337

</I>><i> Cell USA: +1 479 571 0035

</I>><i> 

</I>><i> QirraSound Technologies Europe AB

</I>><i> Slagetorp 2, 57692 Sävsjö, Sweden

</I>><i> Manufacturing unit: QirraSound/VILAX, Tirupsvägen 9, 24593 Staffanstorp,

</I>><i> Sweden

</I>><i> <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">thomas.lago at qirrasound.com</A> <mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">thomas.lago at qirrasound.com</A>> <mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">thomas.lago at qirrasound.com</A> <mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">thomas.lago at qirrasound.com</A>>>

</I>><i> www.qirrasound.se <<A HREF="http://www.qirrasound.se/">http://www.qirrasound.se/</A>> <<A HREF="http://www.qirrasound.se/">http://www.qirrasound.se/</A> <<A HREF="http://www.qirrasound.se/">http://www.qirrasound.se/</A>>>

</I>><i> thomaslago.com <<A HREF="http://thomaslago.com/">http://thomaslago.com/</A>> <<A HREF="http://thomaslago.com/">http://thomaslago.com/</A> <<A HREF="http://thomaslago.com/">http://thomaslago.com/</A>>> 

</I>><i> 

</I>><i> _______________________________________________

</I>><i> SC-04-08 mailing list

</I>><i> <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">SC-04-08 at standards.aes.org</A> <mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">SC-04-08 at standards.aes.org</A>>

</I>><i> <<A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A> <<A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A>>>

</I>><i> 

</I>><i> _______________________________________________

</I>><i> SC-04-08 mailing list

</I>><i> <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">SC-04-08 at standards.aes.org</A> <mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">SC-04-08 at standards.aes.org</A>>

</I>><i> <<A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A> <<A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A>>>

</I>

</PRE>

​

​

<!--endarticle-->

    <HR>

    <P><UL>

        <!--threads-->

    <LI>Previous message: <A HREF="000388.html">[SC-04-08] Comments uploaded by David Murphy

</A></li>

    <LI>Next message: <A HREF="000390.html">[SC-04-08] Comments uploaded by David Murphy

</A></li>

         <LI> <B>Messages sorted by:</B> 

              <a href="date.html#389">[ date ]</a>

              <a href="thread.html#389">[ thread ]</a>

              <a href="subject.html#389">[ subject ]</a>

              <a href="author.html#389">[ 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><br>

​

​

​

   <TITLE> [SC-04-08] Comments uploaded by David Murphy

   </TITLE>

       pre {

           white-space: pre-wrap;       /* css-2.1, curent FF, Opera, Safari */

           }

   <H1>[SC-04-08] Comments uploaded by David Murphy</H1>

    <B>John Woodgate</B> 

    <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20Comments%20uploaded%20by%20David%20Murphy&In-Reply-To=%3C042e01d27301%241b76fcb0%245264f610%24%40btinternet.com%3E" TITLE="[SC-04-08] Comments uploaded by David Murphy">jmw1937 at btinternet.com

       </A><BR>

    <I>Fri Jan 20 04:39:33 EST 2017</I>

    <P><UL>

        <LI>Previous message: <A HREF="000389.html">[SC-04-08] Comments uploaded by David Murphy

</A></li>

        <LI>Next message: <A HREF="000391.html">[SC-04-08] Comments uploaded by David Murphy

</A></li>

         <LI> <B>Messages sorted by:</B> 

              <a href="date.html#390">[ date ]</a>

              <a href="thread.html#390">[ thread ]</a>

              <a href="subject.html#390">[ subject ]</a>

              <a href="author.html#390">[ author ]</a>

         </LI>

       </UL>

    <HR>  

<!--beginarticle-->

<PRE>I'm locked out. My password was rejected, so I went through the process of

setting a new one. That is rejected as well.

​

This changeover has been very badly managed indeed. Why were we not forewarned?

Why aren't we give the option of seeing our password entry in clear instead of

those damned dots? Most sensible web sites allow this.

​

With best wishes DESIGN IT IN! OOO – Own Opinions Only

www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England

​

Sylvae in aeternum manent.

​

​

-----Original Message-----

From: SC-04-08 [mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-bounces at standards.aes.org</A>] On Behalf Of Richard

Cabot via SC-04-08

Sent: Friday, January 20, 2017 9:24 AM

To: 'Working group on Measurement and equalization of sound systems inrooms'

<<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08 at standards.aes.org</A>>

Subject: Re: [SC-04-08] Comments uploaded by David Murphy

​

Thomas's document has been uploaded to the document repository as

x215-20170119-TLL-AES_FFT_Comments.pdf

​

It can be found at <A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A>

​

Rich Cabot

AES Standards Secretary

​

-----Original Message-----

From: SC-04-08 [mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-bounces at standards.aes.org</A>] On Behalf Of

Thomas Lago via SC-04-08

Sent: Sunday, January 15, 2017 12:12 AM

To: Joules Newell

Cc: Peter Mapp; Robinson, Charles Q; Charlie Hughes via SC-04-08

Subject: Re: [SC-04-08] Comments uploaded by David Murphy

​

Dear All,

​

Here comes an attempt to give some more info in regards to FFT, DFT, Gauss

etc. I am also covering windows in more detail. In the attached papers, I

have references to more info. Feel free to ask questions and I will try to

handle this as good as possible.

​

Best regards,

Dr. Thomas L. Lagö

Chief Scientist & Chairman

Cell Sweden: +46 708 357337

Cell USA: +1 479 571 0035

​

QirraSound Technologies Europe AB

Slagetorp 2, 57692 Sävsjö, Sweden

Manufacturing unit: QirraSound/VILAX, Tirupsvägen 9, 24593 Staffanstorp,

Sweden

<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">thomas.lago at qirrasound.com</A> <mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">thomas.lago at qirrasound.com</A>>

www.qirrasound.se <<A HREF="http://www.qirrasound.se/">http://www.qirrasound.se/</A>>

thomaslago.com <<A HREF="http://thomaslago.com/">http://thomaslago.com/</A>> 

​

_______________________________________________

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>>

​

_______________________________________________

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>

​

​

<!--endarticle-->

    <HR>

    <P><UL>

        <!--threads-->

    <LI>Previous message: <A HREF="000389.html">[SC-04-08] Comments uploaded by David Murphy

</A></li>

    <LI>Next message: <A HREF="000391.html">[SC-04-08] Comments uploaded by David Murphy

</A></li>

         <LI> <B>Messages sorted by:</B> 

              <a href="date.html#390">[ date ]</a>

              <a href="thread.html#390">[ thread ]</a>

              <a href="subject.html#390">[ subject ]</a>

              <a href="author.html#390">[ 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><br>

​

​

​

   <TITLE> [SC-04-08] Comments uploaded by David Murphy

   </TITLE>

       pre {

           white-space: pre-wrap;       /* css-2.1, curent FF, Opera, Safari */

           }

   <H1>[SC-04-08] Comments uploaded by David Murphy</H1>

    <B>philip newell</B> 

    <A HREF="mailto:sc-04-08%40standards.aes.org?Subject=Re%3A%20%5BSC-04-08%5D%20Comments%20uploaded%20by%20David%20Murphy&In-Reply-To=%3CCAEEhACnuJEn_ivn3Jq8qHhbkFy_FJx_yY3rozsGsUtJU_eqmUA%40mail.gmail.com%3E" TITLE="[SC-04-08] Comments uploaded by David Murphy">philiprnewell at gmail.com

       </A><BR>

    <I>Fri Jan 20 05:09:33 EST 2017</I>

    <P><UL>

        <LI>Previous message: <A HREF="000390.html">[SC-04-08] Comments uploaded by David Murphy

</A></li>

        <LI>Next message: <A HREF="000393.html">[SC-04-08] Comments uploaded by David Murphy

</A></li>

         <LI> <B>Messages sorted by:</B> 

              <a href="date.html#391">[ date ]</a>

              <a href="thread.html#391">[ thread ]</a>

              <a href="subject.html#391">[ subject ]</a>

              <a href="author.html#391">[ author ]</a>

         </LI>

       </UL>

    <HR>  

<!--beginarticle-->

<PRE>As I mentioned last week, I have also been locked out for a couple of

weeks.

​

I wrote to the Webmaster but he can't help.

​

Some people have suggested that perhaps I don't have a new-enough version

of Windows for the new website (which they are up-dating).

​

​

                      Philip

​

​

​

​

​

​

On 20 January 2017 at 10:39, John Woodgate via SC-04-08 <

<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08 at standards.aes.org</A>> wrote:

​

><i> I'm locked out. My password was rejected, so I went through the process of

</I>><i> setting a new one. That is rejected as well.

</I>><i>

</I>><i> This changeover has been very badly managed indeed. Why were we not

</I>><i> forewarned?

</I>><i> Why aren't we give the option of seeing our password entry in clear

</I>><i> instead of

</I>><i> those damned dots? Most sensible web sites allow this.

</I>><i>

</I>><i> With best wishes DESIGN IT IN! OOO – Own Opinions Only

</I>><i> www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England

</I>><i>

</I>><i> Sylvae in aeternum manent.

</I>><i>

</I>><i>

</I>><i> -----Original Message-----

</I>><i> From: SC-04-08 [mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-bounces at standards.aes.org</A>] On Behalf Of

</I>><i> Richard

</I>><i> Cabot via SC-04-08

</I>><i> Sent: Friday, January 20, 2017 9:24 AM

</I>><i> To: 'Working group on Measurement and equalization of sound systems

</I>><i> inrooms'

</I>><i> <<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08 at standards.aes.org</A>>

</I>><i> Subject: Re: [SC-04-08] Comments uploaded by David Murphy

</I>><i>

</I>><i> Thomas's document has been uploaded to the document repository as

</I>><i> x215-20170119-TLL-AES_FFT_Comments.pdf

</I>><i>

</I>><i> It can be found at <A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A>

</I>><i>

</I>><i> Rich Cabot

</I>><i> AES Standards Secretary

</I>><i>

</I>><i>

</I>><i> -----Original Message-----

</I>><i> From: SC-04-08 [mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">sc-04-08-bounces at standards.aes.org</A>] On Behalf Of

</I>><i> Thomas Lago via SC-04-08

</I>><i> Sent: Sunday, January 15, 2017 12:12 AM

</I>><i> To: Joules Newell

</I>><i> Cc: Peter Mapp; Robinson, Charles Q; Charlie Hughes via SC-04-08

</I>><i> Subject: Re: [SC-04-08] Comments uploaded by David Murphy

</I>><i>

</I>><i> Dear All,

</I>><i>

</I>><i> Here comes an attempt to give some more info in regards to FFT, DFT, Gauss

</I>><i> etc. I am also covering windows in more detail. In the attached papers, I

</I>><i> have references to more info. Feel free to ask questions and I will try to

</I>><i> handle this as good as possible.

</I>><i>

</I>><i> Best regards,

</I>><i> Dr. Thomas L. Lagö

</I>><i> Chief Scientist & Chairman

</I>><i> Cell Sweden: +46 708 357337

</I>><i> Cell USA: +1 479 571 0035

</I>><i>

</I>><i> QirraSound Technologies Europe AB

</I>><i> Slagetorp 2, 57692 Sävsjö, Sweden

</I>><i> Manufacturing unit: QirraSound/VILAX, Tirupsvägen 9, 24593 Staffanstorp,

</I>><i> Sweden

</I>><i> <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">thomas.lago at qirrasound.com</A> <mailto:<A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">thomas.lago at qirrasound.com</A>>

</I>><i> www.qirrasound.se <<A HREF="http://www.qirrasound.se/">http://www.qirrasound.se/</A>>

</I>><i> thomaslago.com <<A HREF="http://thomaslago.com/">http://thomaslago.com/</A>>

</I>><i>

</I>><i> _______________________________________________

</I>><i> SC-04-08 mailing list

</I>><i> <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">SC-04-08 at standards.aes.org</A>

</I>><i> <<A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A>>

</I>><i>

</I>><i> _______________________________________________

</I>><i> SC-04-08 mailing list

</I>><i> <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">SC-04-08 at standards.aes.org</A>

</I>><i> <<A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A>>

</I>><i>

</I>><i> _______________________________________________

</I>><i> SC-04-08 mailing list

</I>><i> <A HREF="https://secure.aes.org/mailman/listinfo/sc-04-08">SC-04-08 at standards.aes.org</A>

</I>><i> <<A HREF="http://standards.aes.org/sc.cfm?ID=91">http://standards.aes.org/sc.cfm?ID=91</A>>

</I>><i>

</I></PRE>

​

​

<!--endarticle-->

    <HR>

    <P><UL>