SC-04-08 Richard Cabot posted an update in the group SC-04-08 3 weeks ago No folders found. Please create and select folder. Documents Folder Title Following special characters are not supported: \ / ? % * : | " < > Privacy Public All Members My Connections Only Me Cancel Create 000127.html 6 KB HTML - Click to view Options Copy Download Link [SC-04-08] Using pink MLS instead of conventional pink nose pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } [SC-04-08] Using pink MLS instead of conventional pink nose Peter Mapp peter at petermapp.com Sun Oct 27 12:38:10 MDT 2013 Previous message: [SC-04-08] Using pink MLS instead of conventional pink nose Next message: [SC-04-08] Using pink MLS instead of conventional pink nose Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] John I have 3 software versions of an MLS signal. Can verify that filtering affects the crest factor _ though don't have results to hand. I could re measure with a known pink filter if this would assist. Peter Sent from my iPhone On 27 Oct 2013, at 12:30, "John Woodgate" <jmw at jmwa.demon.co.uk> wrote: > > Literature searches and some tests indicate that MLS (Maximum Length Sequence)-*based* signals have advantages for sound system testing. > > Note *based* - the signals are not raw MLS but are a.c. coupled to remove the half-amplitude d.c bias and heavily low-pass filtered, which causes the amplitude probability distribution (APD) to change from two spikes at 0 and 1 (a binary signal) to Gaussian. I don't think it has to be Gaussian, but binary is not good at all and to get any other APD than Gaussian is more complicated. > > The crest factor of the binary signal is 1 (peak and r.m.s. are equal for rectangular pulses) but what I don't find at present in the literature is comment on what the crest factor is of the filtered signal. I plan more tests on that. Also, I think that signals of any crest factor can be obtained by analogue-adding (not XOR or modulo-2) delayed versions of the MLS or two or more different MLS with the same recurrence period. > > In the literature, there is an emphasis on making very long sequences that repeat over tens of minutes, but I don't think we want that. There SI an issue with conventional noise signals that they exhibit quite long periods of less amplitude than the very long-term average and equally periods of higher average amplitude. This is a source of uncertainty in measurement, and MLS doesn't show this behaviour. A recurrence period of some tens of seconds seems to me to be practicable, considering how I would make an SPL measurement at a given place, for example. But that is something that can be discussed. > > There is a lot of literature on MLS out there, but I didn't find anything recent of using MLS for audio. I expect I've missed an AES paper or two! If anyone wants the results of my search as a zip archive, I can put it on the web site. It includes a 'pinking' filter. > > One recurrent theme is how easy it is to program a microprocessor to produce MLS. I'm not equipped to handle microprocessors, so my tests are hardware-based, although it's also possible to use Spice simulation; LTspice, for example, will output signals as .wav files so they can be used for testing. > > -- > OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk > If dictionaries were correct, we would only need one, because they would all > give the same information. > John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK > _______________________________________________ > SC-04-08 mailing list > SC-04-08 at standards.aes.org > <http://standards.aes.org/sc.cfm?ID=91> > > Previous message: [SC-04-08] Using pink MLS instead of conventional pink nose Next message: [SC-04-08] Using pink MLS instead of conventional pink nose Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the SC-04-08 mailing list Expand 000126.html 5 KB HTML - Click to view Options Copy Download Link [SC-04-08] Using pink MLS instead of conventional pink nose pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } [SC-04-08] Using pink MLS instead of conventional pink nose John Woodgate jmw at jmwa.demon.co.uk Sun Oct 27 06:18:13 MDT 2013 Previous message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Next message: [SC-04-08] Using pink MLS instead of conventional pink nose Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Literature searches and some tests indicate that MLS (Maximum Length Sequence)-*based* signals have advantages for sound system testing. Note *based* - the signals are not raw MLS but are a.c. coupled to remove the half-amplitude d.c bias and heavily low-pass filtered, which causes the amplitude probability distribution (APD) to change from two spikes at 0 and 1 (a binary signal) to Gaussian. I don't think it has to be Gaussian, but binary is not good at all and to get any other APD than Gaussian is more complicated. The crest factor of the binary signal is 1 (peak and r.m.s. are equal for rectangular pulses) but what I don't find at present in the literature is comment on what the crest factor is of the filtered signal. I plan more tests on that. Also, I think that signals of any crest factor can be obtained by analogue-adding (not XOR or modulo-2) delayed versions of the MLS or two or more different MLS with the same recurrence period. In the literature, there is an emphasis on making very long sequences that repeat over tens of minutes, but I don't think we want that. There SI an issue with conventional noise signals that they exhibit quite long periods of less amplitude than the very long-term average and equally periods of higher average amplitude. This is a source of uncertainty in measurement, and MLS doesn't show this behaviour. A recurrence period of some tens of seconds seems to me to be practicable, considering how I would make an SPL measurement at a given place, for example. But that is something that can be discussed. There is a lot of literature on MLS out there, but I didn't find anything recent of using MLS for audio. I expect I've missed an AES paper or two! If anyone wants the results of my search as a zip archive, I can put it on the web site. It includes a 'pinking' filter. One recurrent theme is how easy it is to program a microprocessor to produce MLS. I'm not equipped to handle microprocessors, so my tests are hardware-based, although it's also possible to use Spice simulation; LTspice, for example, will output signals as .wav files so they can be used for testing. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk If dictionaries were correct, we would only need one, because they would all give the same information. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK Previous message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Next message: [SC-04-08] Using pink MLS instead of conventional pink nose Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the SC-04-08 mailing list Expand 000129.html 4 KB HTML - Click to view Options Copy Download Link [SC-04-08] Using pink MLS instead of conventional pink nose pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } [SC-04-08] Using pink MLS instead of conventional pink nose John Woodgate jmw at jmwa.demon.co.uk Sun Oct 27 13:10:41 MDT 2013 Previous message: [SC-04-08] Using pink MLS instead of conventional pink nose Next message: [SC-04-08] Using pink MLS instead of conventional pink nose Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] In message <BLU0-SMTP13435A2E1F7815AEF8EEEC1CC0F0 at phx.gbl>, dated Sun, 27 Oct 2013, Thomas Lagö <thomaslago at msn.com> writes: >I have designed MLS signal generators and have vast knowledge and >understanding about the signal processing, filtering etc for these >signals and its advantages (and disadvantages) for different systems. >Where do you want me to start? Well, first of all, do you agree that for the assessment of sound systems in room, and the SMPTE cinema sound liaison project, an MLS-based pink noise signal is a good idea (predictable, the crest factor can be 'designed in', and no doubt about its value when it has been designed in, no long-term below- or above-average r.m.s. value episodes). If not, there may be no point in proceeding. If you do agree, what are the characteristics of the low-pass filer (white at this stage) noise signal, in terms of APD and crest factor? Can different crest factors be obtained by analogue-adding delayed versions of a single sequence or two different sequences (different seeds) with the same recurrence period? What the happens to the APD and crest factor when we apply the pinking filter? Beyond that, please share with us what is relevant to the projects. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk If dictionaries were correct, we would only need one, because they would all give the same information. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK Previous message: [SC-04-08] Using pink MLS instead of conventional pink nose Next message: [SC-04-08] Using pink MLS instead of conventional pink nose Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the SC-04-08 mailing list Expand 000128.html 7 KB HTML - Click to view Options Copy Download Link [SC-04-08] Using pink MLS instead of conventional pink nose pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } [SC-04-08] Using pink MLS instead of conventional pink nose Thomas Lagö thomaslago at msn.com Sun Oct 27 12:42:41 MDT 2013 Previous message: [SC-04-08] Using pink MLS instead of conventional pink nose Next message: [SC-04-08] Using pink MLS instead of conventional pink nose Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] To all: I have designed MLS signal generators and have vast knowledge and understanding about the signal processing, filtering etc for these signals and its advantages (and disadvantages) for different systems. Where do you want me to start? Best regards, Thomas Lagö On Oct 27, 2013, at 7:38 PM, "Peter Mapp" <peter at petermapp.com> wrote: > John > > I have 3 software versions of an MLS signal. Can verify that filtering affects the crest factor _ though don't have results to hand. I could re measure with a known pink filter if this would assist. Peter > > Sent from my iPhone > > On 27 Oct 2013, at 12:30, "John Woodgate" <jmw at jmwa.demon.co.uk> wrote: > >> >> Literature searches and some tests indicate that MLS (Maximum Length Sequence)-*based* signals have advantages for sound system testing. >> >> Note *based* - the signals are not raw MLS but are a.c. coupled to remove the half-amplitude d.c bias and heavily low-pass filtered, which causes the amplitude probability distribution (APD) to change from two spikes at 0 and 1 (a binary signal) to Gaussian. I don't think it has to be Gaussian, but binary is not good at all and to get any other APD than Gaussian is more complicated. >> >> The crest factor of the binary signal is 1 (peak and r.m.s. are equal for rectangular pulses) but what I don't find at present in the literature is comment on what the crest factor is of the filtered signal. I plan more tests on that. Also, I think that signals of any crest factor can be obtained by analogue-adding (not XOR or modulo-2) delayed versions of the MLS or two or more different MLS with the same recurrence period. >> >> In the literature, there is an emphasis on making very long sequences that repeat over tens of minutes, but I don't think we want that. There SI an issue with conventional noise signals that they exhibit quite long periods of less amplitude than the very long-term average and equally periods of higher average amplitude. This is a source of uncertainty in measurement, and MLS doesn't show this behaviour. A recurrence period of some tens of seconds seems to me to be practicable, considering how I would make an SPL measurement at a given place, for example. But that is something that can be discussed. >> >> There is a lot of literature on MLS out there, but I didn't find anything recent of using MLS for audio. I expect I've missed an AES paper or two! If anyone wants the results of my search as a zip archive, I can put it on the web site. It includes a 'pinking' filter. >> >> One recurrent theme is how easy it is to program a microprocessor to produce MLS. I'm not equipped to handle microprocessors, so my tests are hardware-based, although it's also possible to use Spice simulation; LTspice, for example, will output signals as .wav files so they can be used for testing. >> >> -- >> OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk >> If dictionaries were correct, we would only need one, because they would all >> give the same information. >> John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK >> _______________________________________________ >> SC-04-08 mailing list >> SC-04-08 at standards.aes.org >> <http://standards.aes.org/sc.cfm?ID=91> >> >> > > _______________________________________________ > SC-04-08 mailing list > SC-04-08 at standards.aes.org > <http://standards.aes.org/sc.cfm?ID=91> > Previous message: [SC-04-08] Using pink MLS instead of conventional pink nose Next message: [SC-04-08] Using pink MLS instead of conventional pink nose Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the SC-04-08 mailing list Expand 000120.html 3 KB HTML - Click to view Options Copy Download Link [SC-04-08] Uploads pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } [SC-04-08] Uploads John Woodgate jmw at jmwa.demon.co.uk Wed Oct 2 12:58:51 MDT 2013 Previous message: [SC-04-08] Uploads Next message: [SC-04-08] Uploads Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] In message <2BE563BCBE473946A8E72AE261D4F64BE7934F75 at XCHG2.ms.msli.com>, dated Wed, 2 Oct 2013, Pete Soper <psoper at meyersound.com> writes: >I have a meeting of the SMPTE group next Wednesday, do we have anything >to provide in terms of feedback on the topics outlined in the "straw >man draft" standard document for the group's consideration or >discussion? Well, obviously I submitted comments but whether they are what you want, I don't know. I suppose you may be looking for an AES consensus feedback, but whether Mark can provide that is another matter. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk If dictionaries were correct, we would only need one, because they would all give the same information. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK Previous message: [SC-04-08] Uploads Next message: [SC-04-08] Uploads Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the SC-04-08 mailing list Expand 000121.html 5 KB HTML - Click to view Options Copy Download Link [SC-04-08] Uploads pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } [SC-04-08] Uploads Brian McCarty bmccarty at coralseastudios.com Wed Oct 2 13:08:20 MDT 2013 Previous message: [SC-04-08] Uploads Next message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] With the AES Convention (and associated Standards meetings) only a couple weeks away, it would seem prudent to wait for a response from the committee. Brian McCarty Chair TC-SDCTV On Oct 3, 2013, at 4:22 AM, Pete Soper <psoper at meyersound.com> wrote: > I have a meeting of the SMPTE group next Wednesday, do we have anything to provide in terms of feedback on the topics outlined in the "straw man draft" standard document for the group's consideration or discussion? > > Thanks and best regards > > -Pete Soper > > > > -----Original Message----- > From: sc-04-08-bounces at standards.aes.org [mailto:sc-04-08-bounces at standards.aes.org] On Behalf Of John Woodgate > Sent: Monday, September 09, 2013 8:31 AM > To: SC-04-08 > Subject: [SC-04-08] Uploads > > I have uploaded a Word conversion of the SMPTE Working Draft, with line > numbers. I suggest you comment on this in the same way as I have > commented in a further upload. Just delete all my text from the comment > form and replace with your own. > -- > OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk > If dictionaries were correct, we would only need one, because they would all > give the same information. > John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK > _______________________________________________ > SC-04-08 mailing list > SC-04-08 at standards.aes.org > <http://standards.aes.org/sc.cfm?ID=91> > > NOTICE: This email may contain confidential information. Please see http://www.meyersound.com/confidential/ for our complete policy. > _______________________________________________ > SC-04-08 mailing list > SC-04-08 at standards.aes.org > <http://standards.aes.org/sc.cfm?ID=91> Previous message: [SC-04-08] Uploads Next message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the SC-04-08 mailing list Expand 000123.html 4 KB HTML - Click to view Options Copy Download Link [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Kurt Graffy Kurt.Graffy at arup.com Fri Oct 18 09:13:11 MDT 2013 Previous message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Next message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Mark...thanks but my travel plans were changed...just leaving SFO now...and I don't think United will let me Go to Meeting on the plane! Kurt Sent from my Verizon Wireless Phone ----- Reply message ----- From: "Mark Yonge" <mark at yonge.org.uk> To: "sc-04-08 at standards.aes.org" <sc-04-08 at standards.aes.org> Cc: "Mark Yonge" <mark at yonge.org.uk> Subject: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Date: Fri, Oct 18, 2013 8:05 am Dear SC-04-08, While no-one has actually requested remote participation at this meeting, there may be some who would like this. Please feel free to use this GoToMeeting link to join us. the meeting just started. regards Mark Yonge 1. Please join my meeting, 18 Oct 2013 at 11:03 EDT. https://global.gotomeeting.com/join/708675917 2. Use your microphone and speakers (VoIP) - a headset is recommended. Or, call in using your telephone. United Kingdom: +44 20 3657 6776 Australia: +61 2 8355 1031 United States: +1 (213) 493-0619 Access Code: 708-675-917 Audio PIN: Shown after joining the meeting Meeting ID: 708-675-917 GoToMeeting® Online Meetings Made Easy® Not at your computer? Click the link to join this meeting from your iPhone®, iPad® or Android® device via the GoToMeeting app. _______________________________________________ SC-04-08 mailing list SC-04-08 at standards.aes.org <http://standards.aes.org/sc.cfm?ID=91> ____________________________________________________________ Electronic mail messages entering and leaving Arup business systems are scanned for acceptability of content and viruses Previous message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Next message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the SC-04-08 mailing list Expand 000122.html 3 KB HTML - Click to view Options Copy Download Link [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Mark Yonge mark at yonge.org.uk Fri Oct 18 09:04:57 MDT 2013 Previous message: [SC-04-08] Uploads Next message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Dear SC-04-08, While no-one has actually requested remote participation at this meeting, there may be some who would like this. Please feel free to use this GoToMeeting link to join us. the meeting just started. regards Mark Yonge 1. Please join my meeting, 18 Oct 2013 at 11:03 EDT. https://global.gotomeeting.com/join/708675917 2. Use your microphone and speakers (VoIP) - a headset is recommended. Or, call in using your telephone. United Kingdom: +44 20 3657 6776 Australia: +61 2 8355 1031 United States: +1 (213) 493-0619 Access Code: 708-675-917 Audio PIN: Shown after joining the meeting Meeting ID: 708-675-917 GoToMeeting® Online Meetings Made Easy® Not at your computer? Click the link to join this meeting from your iPhone®, iPad® or Android® device via the GoToMeeting app. Previous message: [SC-04-08] Uploads Next message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the SC-04-08 mailing list Expand 000124.html 4 KB HTML - Click to view Options Copy Download Link [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 philip newell philiprnewell at gmail.com Fri Oct 18 10:13:16 MDT 2013 Previous message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Next message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Dea Mark, I couldn't get in, neither via Firefox nor Internet Explorer. Best wishes, Philip On 18 October 2013 17:04, Mark Yonge <mark at yonge.org.uk> wrote: > Dear SC-04-08, > > While no-one has actually requested remote participation at this meeting, > there may be some who would like this. > > Please feel free to use this GoToMeeting link to join us. the meeting just > started. > > regards > > Mark Yonge > > 1. Please join my meeting, 18 Oct 2013 at 11:03 EDT. > https://global.gotomeeting.com/join/708675917 > > 2. Use your microphone and speakers (VoIP) - a headset is recommended. > Or, call in using your telephone. > > United Kingdom: +44 20 3657 6776 > Australia: +61 2 8355 1031 > United States: +1 (213) 493-0619 > Access Code: 708-675-917 > Audio PIN: Shown after joining the meeting > > Meeting ID: 708-675-917 > > GoToMeeting® > Online Meetings Made Easy® > > Not at your computer? Click the link to join this meeting from your > iPhone®, iPad® or Android® device via the GoToMeeting app. > _______________________________________________ > SC-04-08 mailing list > SC-04-08 at standards.aes.org > <http://standards.aes.org/sc.cfm?ID=91> > Previous message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Next message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the SC-04-08 mailing list Expand 000125.html 5 KB HTML - Click to view Options Copy Download Link [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 pre { white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ } [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Daniele Ponteggia ponteggia at gmail.com Fri Oct 18 11:03:21 MDT 2013 Previous message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Next message: [SC-04-08] Using pink MLS instead of conventional pink nose Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Dear Mark, I'm sorry for joining the meeting late. Thank you for the possibility to remotely participate. Best Regards. Daniele Ponteggia On Fri, Oct 18, 2013 at 6:13 PM, philip newell <philiprnewell at gmail.com>wrote: > Dea Mark, > > I couldn't get in, neither via Firefox nor Internet > Explorer. > > > > Best wishes, > > > > Philip > > > On 18 October 2013 17:04, Mark Yonge <mark at yonge.org.uk> wrote: > > > Dear SC-04-08, > > > > While no-one has actually requested remote participation at this meeting, > > there may be some who would like this. > > > > Please feel free to use this GoToMeeting link to join us. the meeting > just > > started. > > > > regards > > > > Mark Yonge > > > > 1. Please join my meeting, 18 Oct 2013 at 11:03 EDT. > > https://global.gotomeeting.com/join/708675917 > > > > 2. Use your microphone and speakers (VoIP) - a headset is recommended. > > Or, call in using your telephone. > > > > United Kingdom: +44 20 3657 6776 > > Australia: +61 2 8355 1031 > > United States: +1 (213) 493-0619 > > Access Code: 708-675-917 > > Audio PIN: Shown after joining the meeting > > > > Meeting ID: 708-675-917 > > > > GoToMeeting® > > Online Meetings Made Easy® > > > > Not at your computer? Click the link to join this meeting from your > > iPhone®, iPad® or Android® device via the GoToMeeting app. > > _______________________________________________ > > SC-04-08 mailing list > > SC-04-08 at standards.aes.org > > <http://standards.aes.org/sc.cfm?ID=91> > > > _______________________________________________ > SC-04-08 mailing list > SC-04-08 at standards.aes.org > <http://standards.aes.org/sc.cfm?ID=91> > Previous message: [SC-04-08] GoToMeeting Invitation - AESSC SC-04-08 Next message: [SC-04-08] Using pink MLS instead of conventional pink nose Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the SC-04-08 mailing list Expand 0 Comments Public All Members My Connections Only Me PublicAll MembersMy ConnectionsOnly Me Public All Members My Connections Only Me