From arodriguez@u-tokyo.ac.jp Fri Jan 05 04:26:01 1996 Path: ashpoly!cascade!transat!ukc!fennimore!u-tokyo!arodriguez From: arodriguez@u-tokyo.ac.jp (Anton Rodríguez) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jan05.042601.8579@u-tokyo.ac.jp> Date: Fri, 05 Jan 1996 04:26:01 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Anton Rodríguez Zyxel U-1496E @ 33,600 bps "Measuring a record you own is listening, not piracy." From dkarlsson@cam.ac.uk Sat Jan 06 22:54:01 1996 Path: ashpoly!cascade!brgate!saturno!cam!dkarlsson From: dkarlsson@cam.ac.uk (Dong-hyun Karlsson) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jan06.225401.9918@cam.ac.uk> Date: Sat, 06 Jan 1996 22:54:01 GMT References: <1996Jan05.042601.8579@u-tokyo.ac.jp> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Jan05.042601.8579@u-tokyo.ac.jp>, arodriguez@u-tokyo.ac.jp (Anton Rodríguez) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Dong-hyun Karlsson "They will send a copy in my place." Commodore Amiga 500 (1MB OCS) / AmigaOS 3.1 From gkuznetsov@mit.edu Sun Jan 07 09:18:01 1996 Path: ashpoly!cascade!bigsur!mit!gkuznetsov From: gkuznetsov@mit.edu (Graham Kuznetsov) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jan07.091801.3425@mit.edu> Date: Sun, 07 Jan 1996 09:18:01 GMT References: <1996Jan05.042601.8579@u-tokyo.ac.jp> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jan05.042601.8579@u-tokyo.ac.jp>, arodriguez@u-tokyo.ac.jp (Anton Rodríguez) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins. -- Graham Kuznetsov -- Massachusetts Institute of Technology "Row 14. No joke." From tduarte@netcom.com Tue Jan 09 01:31:01 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!netcom!tduarte From: tduarte@netcom.com (Tobias Duarte) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jan09.013101.8933@netcom.com> Date: Tue, 09 Jan 1996 01:31:01 GMT References: <1996Jan05.042601.8579@u-tokyo.ac.jp> <1996Jan06.225401.9918@cam.ac.uk> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jan06.225401.9918@cam.ac.uk>, dkarlsson@cam.ac.uk (Dong-hyun Karlsson) writes: > Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz. > Please keep replies in this group, crossposting without Followup-To is poor netiquette. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Tobias Duarte -- NETCOM On-Line Communication Services "Row 14. No joke." From tkarlsson@uni-hamburg.de Wed Jan 10 06:36:01 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!tkarlsson From: tkarlsson@uni-hamburg.de (Thiago Karlsson) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jan10.063601.6981@uni-hamburg.de> Date: Wed, 10 Jan 1996 06:36:01 GMT References: <1996Jan05.042601.8579@u-tokyo.ac.jp> <1996Jan07.091801.3425@mit.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Jan07.091801.3425@mit.edu>, gkuznetsov@mit.edu (Graham Kuznetsov) writes: > You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Thiago Karlsson | tkarlsson@uni-hamburg.de PGP Key fingerprint: 2B25 B011 D8AD 339A "Keep the channels open."