From fpark@netcom.com Sun May 08 06:09:05 1994 Path: ashpoly!cascade!transat!ukc!fennimore!netcom!fpark From: fpark@netcom.com (Freya Park) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994May08.060905.9238@netcom.com> Date: Sun, 08 May 1994 06:09:05 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Freya Park "Row 14. No joke." PC-9821Ap2 (NEC) / NEXTSTEP 3.3 From aoliveira@pacbell.net Tue May 10 00:48:05 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!pacbell!aoliveira From: aoliveira@pacbell.net (Anton Oliveira) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994May10.004805.8804@pacbell.net> Date: Tue, 10 May 1994 00:48:05 GMT References: <1994May08.060905.9238@netcom.com> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994May08.060905.9238@netcom.com>, fpark@netcom.com (Freya Park) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Anton Oliveira | aoliveira@pacbell.net PGP Key fingerprint: 85F7 8F45 018D 66E2 "Keep the channels open." From frodriguez@pacbell.net Tue May 10 05:14:05 1994 Path: ashpoly!cascade!bigsur!pacbell!frodriguez From: frodriguez@pacbell.net (Freya Rodríguez) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994May10.051405.3753@pacbell.net> Date: Tue, 10 May 1994 05:14:05 GMT References: <1994May08.060905.9238@netcom.com> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994May08.060905.9238@netcom.com>, fpark@netcom.com (Freya Park) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Freya Rodríguez Opinions expressed are solely my own and not those of Pacific Bell Internet Services. ------------------------------------------------------------ From dsmirnov@u-tokyo.ac.jp Wed May 11 18:53:05 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!u-tokyo!dsmirnov From: dsmirnov@u-tokyo.ac.jp (Dmitri Smirnov) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994May11.185305.1262@u-tokyo.ac.jp> Date: Wed, 11 May 1994 18:53:05 GMT References: <1994May08.060905.9238@netcom.com> <1994May10.004805.8804@pacbell.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 11 In article <1994May10.004805.8804@pacbell.net>, aoliveira@pacbell.net (Anton Oliveira) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Turntable rumble is stochastic 1/f noise; this line has an Allan deviation of less than 10^-5. It was generated by a quartz crystal clock. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Dmitri Smirnov Practical Peripherals 14.4 @ 28,800 bps "Do not worship the copy."