July 2010 - sg16-avd - lists.packetizer.com

Re: [itu-sg16] TR: [WP3Aud] FW: Question on G.726
by yusuke hiwasaki 28 Jul '10

28 Jul '10

Dear Mr. Yamamoto, Thank you for reporting your findings on G.726. As an Associate Rapporteur of Q10/16 and Editor of G.191 (STL), I would like to give some feedbacks on this report. Please accept my apologies for this slow response. Firstly, to give you some idea on the narrow-band codecs available in G.7xx series, those codecs usually expects band-pass filtered signal between 300 and 3400 Hz, and are characterized using speech signal (and perhaps modem signal) that lies within that frequency range. This means that extremely low frequency input signal such as 1 and 2 Hz is not expected. For the case of G.726, there is a backward adaptive predictor. I do not have your signal and might be wrong in saying this, but my assumption is that feeding a low-frquency signal puts the codec state in an extreme divergence that results in large amplitude impulses as you report. My suggestion for this would be to have either a band- or high-pass filter that eliminates signal below 300 Hz before the encoding block. An example implementation of such filter is also available in STL. I would be happy to answer any further questions, but I think it is appropriate to discuss it at WP3 audio reflector (wp3audio(a)yahoogroups.com) Best regards, yusuke -- ============ Yusuke Hiwasaki, NTT Cyber Space Labs. hiwasaki.yusuke(a)lab.ntt.co.jp Tel: +81-422-59-4815 (Fax: +81-422-60-7811) BEGIN --- 8< --- CUT HERE --- 8< --- From: itu-sg16-bounces(a)lists.packetizer.com [mailto:itu-sg16-bounces@ lists.packetizer.com] On Behalf Of Yamamoto, Tetsuya Sent: Friday, 16 July 2010 8:46 To: itu-sg16(a)lists.packetizer.com Subject: [itu-sg16] Question on G.726 Dear Q10/16 Experts, Sorry to bother you. We have found unexpected results when using G.726. When particular waveform audio data are input to G.726 encoder, the decoded data from G.726 decoder include large amplitude impulses. We can reproduce the same phenomena at any of 16, 24, 32 or 40kbps bitrate when we put sine wave signal with very low frequency such as 1Hz or 2Hz into G.726 codec. Our codec module is generated from the C source code provided by G.191 software tools as is and the all test sequences provided by G.726 Appendix II are passed with this module. It would be appreciated if anyone could give me some suggestions regarding this matter. Thanks and best regards, Tetsuya Yamamoto Sony Corporation END --- 8< --- CUT HERE --- 8< ---

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[itu-sg16] Home networking: Joint session of SG 16 Q21/16 and SG 15 Q4/15
by simao.campos＠itu.int 26 Jul '10

26 Jul '10

Dear all, FYI there will be a session of Q4/15 where home networking work of SG 15 and SG 16 will be briefly discussed, in particular G.HN and G.HNEM from the SG 15 side. This will take place Wed 28 July 2010 09:30 in room G2, and is expected to last less than a quarter session. Interested experts in Geneva are invited to attend. Best regards, Simao

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[itu-sg16] Meeting documents for the AVC Site
by Paul E. Jones 25 Jul '10

25 Jul '10

Folks, I have placed some of the input and output files related to this meeting here: http://ftp3.itu.ch/av-arch/avc-site/2009-2012/1007_Gen/1007_Gen.html This is by no means all of the input and output documents, but I would encourage you to upload your documents to the /Incoming directory so that we can get them placed in the meeting directory and properly added to the index file. Paul

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[itu-sg16] FG Cloud 2nd meeting (Geneva, 2-6 Sep 2010)
by simao.campos＠itu.int 20 Jul '10

20 Jul '10

Dear all For your information. Best regards, Simao _____________________________________________ From: Yamada, Mitsuru Sent: Tuesday, July 20, 2010 11:47 AM To: fgcloud(a)lists.itu.int Cc: Sebek, Boguslaw Georges; Yamada, Mitsuru; TSB FG CLOUD, ITU Subject: FG Cloud 2nd meeting Dear all, 1. Meeting announcement for the next Focus Group on Cloud Computing meeting to be held in Geneva, from 2 to 6 September 2010 is now posted on the FG Cloud web page at: http://itu.int/ITU-T/focusgroups/cloud/ 2. Please note that joint session is planned with the Focus Group on Future Network(FG FN) that will meet at the same location from 6 to 9 September 2010. 3. For the next FG Cloud meeting, please register preferably by 6 August 2010. The online registration form is also available on the FG Cloud web page: http://itu.int/reg/tsg/3000173 4. The deadline for submitting contributions to the meeting is 27 August 2010. A template for contributions is available at : http://www.itu.int/oth/T4901000001/en 5. Results from 1st meeting are posted at: http://ifa.itu.int/t/fg/cloud/docs/1006-gva/out/ FG Cloud Secretariat

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Re: [itu-sg16] Question on G.726
by Yamamoto, Tetsuya 16 Jul '10

16 Jul '10

Dear Mr.Schwarz, Thank you for your quick response. The reference C source code outputs encoded data without packing. I don't think this issue is caused by encapsulation procedure. Best regards, Tetsuya Yamamoto ________________________________ From: Schwarz, Albrecht (Albrecht) [mailto:albrecht.schwarz@alcatel-lucent.com] Sent: Friday, July 16, 2010 4:13 PM To: Yamamoto, Tetsuya; itu-sg16(a)lists.packetizer.com Subject: RE: Question on G.726 [just to exclude the possibilty of the "right bitorder", there are two encapsulation schemes arround, see e.g. recent discussion in AVT G.726 payload bitorder (RFC 3551) in current implementations<http://www.ietf.org/mail-archive/web/avt/current/msg13166.html>, http://www.ietf.org/mail-archive/web/avt/current/msg13166.html ] ________________________________ From: itu-sg16-bounces(a)lists.packetizer.com [mailto:itu-sg16-bounces@lists.packetizer.com] On Behalf Of Yamamoto, Tetsuya Sent: Freitag, 16. Juli 2010 08:46 To: itu-sg16(a)lists.packetizer.com Subject: [itu-sg16] Question on G.726 Dear Q10/16 Experts, Sorry to bother you. We have found unexpected results when using G.726. When particular waveform audio data are input to G.726 encoder, the decoded data from G.726 decoder include large amplitude impulses. We can reproduce the same phenomena at any of 16, 24, 32 or 40kbps bitrate when we put sine wave signal with very low frequency such as 1Hz or 2Hz into G.726 codec. Our codec module is generated from the C source code provided by G.191 software tools as is and the all test sequences provided by G.726 Appendix II are passed with this module. It would be appreciated if anyone could give me some suggestions regarding this matter. Thanks and best regards, Tetsuya Yamamoto Sony Corporation

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[itu-sg16] Question on G.726
by Yamamoto, Tetsuya 16 Jul '10

16 Jul '10

Dear Q10/16 Experts, Sorry to bother you. We have found unexpected results when using G.726. When particular waveform audio data are input to G.726 encoder, the decoded data from G.726 decoder include large amplitude impulses. We can reproduce the same phenomena at any of 16, 24, 32 or 40kbps bitrate when we put sine wave signal with very low frequency such as 1Hz or 2Hz into G.726 codec. Our codec module is generated from the C source code provided by G.191 software tools as is and the all test sequences provided by G.726 Appendix II are passed with this module. It would be appreciated if anyone could give me some suggestions regarding this matter. Thanks and best regards, Tetsuya Yamamoto Sony Corporation

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[itu-sg16] Q13/16 e-Meeting 16June: Accepted TD - 'HSTP.IPTV-ISPF (IPTV Service Platform)'
by Teck Kiong 08 Jul '10

08 Jul '10

Hi, Attached is the accepted TD 'HSTP.IPTV-ISPF (IPTV Service Platform)' draft technical paper from the ITU-SG16 Q13/16 e-Meeting (16 June 2010) discussion. Thank you. Regards, Teck Kiong LEE **** Institute for Infocomm Research, A*Star, Singapore Institute for Infocomm Research disclaimer: "This email is confidential and may be privileged. If you are not the intended recipient, please delete it and notify us immediately. Please do not copy or use it for any purpose, or disclose its contents to any other person. Thank you."

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[itu-sg16] Meeting result on July 7
by 谷川　和法 07 Jul '10

07 Jul '10

------- 以下は転送メッセージ ------- Subject: Meeting result on July 7 From: Kazunori TANIKAWA <kazu(a)q04.itscom.net> Date: 07/08 00:16 Dear Q13/16 Chairs and Experts, This is a report of e-meeting on July 7, 2010. Moderator: K.Tanikawa (on behalf of Mr.Kawamori) Attendee: Teck Kiong Lee, Raf?(India delegate), Simao Campos, Kazunori Tanikawa Contributions: - HTSP.IPTV-ISPF: Editorial modifications (Singapore) Proposal was accepted. Editors hope to complete and have approval this document at SG16 plenary on July 30. - H.770 Amd.2: Oppen Issues (NEC) Main proposers of TR-069 items, both Brazil and Huawei, were absent from the e-meeting; therefore, just review remaining issues of H.770. It is necessary to consult with them during next IPTV-GSI. - H.IPTV-CONF.7: Updated document (NEC) Review new modifications and additions to H.CONF.7. Proposal is accepted. - H.IPTV-CONF.6: H.762 conformance sample test for the New Draft Recommendation H.IPTV-CONF.6(NTT) Contributor has not made in time; therefore, moderator presented briefly. There seemed to be no objection; however, it is good thing to present this contribution at next Q13/16 rappoture meeting. -- ------- ここまでが転送メッセージ -------

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[itu-sg16] Regular Q13/16 Electronic-meeting contribution
by Masahito Kawamori 07 Jul '10

07 Jul '10

Dear Experts of Q13/16 Here is a contribution from Huawei. Best regards Kawamori

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[itu-sg16] Update of NID draft recommendations
by Yoshinori Goto 06 Jul '10

06 Jul '10

Dear Q21 and 22 experts, At the Shanghai meeting, March 2010, we agreed to update the draft text of H.IDscheme and H.IRP in such a way that two recommendations adopt ucode and DNS based protocol. Based on this agreement, the editors are requested to prepare updated draft text and distribute them on the e-mail reflector. Considering that two draft recommendations are planned to be consented at the next SG16 meeting (July 2010) and that the degree of change on two drafts will be significant, earlier distribution of updated draft for review of other experts is a critical procedure for these documents. So, I would like to ask the editors of H.IDscheme and H.IRP, Mr. Lee and Prof. Koshizuka, to distribute the update draft as soon as possible and collect comments from other experts, particularly Mr. Olivier. Best regards, -- <><><><><><><><><><><><><><><><><><><><><><><><> Yoshinori Goto NTT Access Network Service Systems Labs. TEL:+81 46 859 2241 FAX:+81 46 859 5513 e-mail:goto.yoshinori@lab.ntt.co.jp <><><><><><><><><><><><><><><><><><><><><><><><>

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