From isato@stanford.edu Mon Oct 07 08:27:00 1996 Path: ashpoly!cascade!bigsur!stanford!isato From: isato@stanford.edu (Ines Sato) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Oct07.082700.7037@stanford.edu> Date: Mon, 07 Oct 1996 08:27:00 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). 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? -- Ines Sato -- Stanford University Computer Systems Lab "Measuring a record you own is listening, not piracy." From vmartinez@kth.se Tue Oct 08 07:24:00 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!vmartinez From: vmartinez@kth.se (Valeria Martínez) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Oct08.072400.9789@kth.se> Date: Tue, 08 Oct 1996 07:24:00 GMT References: <1996Oct07.082700.7037@stanford.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Oct07.082700.7037@stanford.edu>, isato@stanford.edu (Ines Sato) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). 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. -- Valeria Martínez Practical Peripherals 14.4 @ 9600 Telebit bps "5 sigma is a discovery. 7 is a question." From mtanaka@rwth-aachen.de Tue Oct 08 12:31:00 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!rwth-aachen!mtanaka From: mtanaka@rwth-aachen.de (Mei Tanaka) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Oct08.123100.5815@rwth-aachen.de> Date: Tue, 08 Oct 1996 12:31:00 GMT References: <1996Oct07.082700.7037@stanford.edu> <1996Oct08.072400.9789@kth.se> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1996Oct08.072400.9789@kth.se>, vmartinez@kth.se (Valeria Martínez) writes: > 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. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Mei Tanaka Tape trading list upon request. SASE required for international mail. From gdubois@mindspring.com Wed Oct 09 23:19:00 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!gdubois From: gdubois@mindspring.com (Göran Dubois) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Oct09.231900.5557@mindspring.com> Date: Wed, 09 Oct 1996 23:19:00 GMT References: <1996Oct07.082700.7037@stanford.edu> <1996Oct08.072400.9789@kth.se> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Oct08.072400.9789@kth.se>, vmartinez@kth.se (Valeria Martínez) writes: > 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. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Göran Dubois *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From lvasiliev@clari.net Fri Oct 11 14:35:00 1996 Path: ashpoly!cascade!mxgate!coyoacan!clari!lvasiliev From: lvasiliev@clari.net (Lucia Vasiliev) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Oct11.143500.6551@clari.net> Date: Fri, 11 Oct 1996 14:35:00 GMT References: <1996Oct07.082700.7037@stanford.edu> <1996Oct08.072400.9789@kth.se> <1996Oct09.231900.5557@mindspring.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Oct09.231900.5557@mindspring.com>, gdubois@mindspring.com (Göran Dubois) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Lucia Vasiliev Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------