From spark@ox.ac.uk Fri Jul 01 19:52:04 1994 Path: ashpoly!cascade!bigsur!ox!spark From: spark@ox.ac.uk (Steve Park) Newsgroups: comp.dsp Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jul01.195204.4708@ox.ac.uk> Date: Fri, 01 Jul 1994 19:52:04 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N 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. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Steve Park *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From akowalski@cmu.edu Sun Jul 03 22:26:04 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cmu!akowalski From: akowalski@cmu.edu (Andrei Kowalski) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jul03.222604.2286@cmu.edu> Date: Sun, 03 Jul 1994 22:26:04 GMT References: <1994Jul01.195204.4708@ox.ac.uk> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Jul01.195204.4708@ox.ac.uk>, spark@ox.ac.uk (Steve 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. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Andrei Kowalski Opinions expressed are solely my own and not those of Carnegie Mellon University School of CS. ------------------------------------------------------------ From osilva@illinois.edu Mon Jul 04 07:20:04 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!osilva From: osilva@illinois.edu (Olga Silva) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jul04.072004.4273@illinois.edu> Date: Mon, 04 Jul 1994 07:20:04 GMT References: <1994Jul01.195204.4708@ox.ac.uk> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Jul01.195204.4708@ox.ac.uk>, spark@ox.ac.uk (Steve 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. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- Olga Silva SupraFAXModem 28.8 @ 14,400 bps "Do not worship the copy." From sgonzalez@demon.co.uk Mon Jul 04 11:55:04 1994 Path: ashpoly!cascade!brgate!saturno!demon!sgonzalez From: sgonzalez@demon.co.uk (Seo-yeon González) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jul04.115504.5407@demon.co.uk> Date: Mon, 04 Jul 1994 11:55:04 GMT References: <1994Jul01.195204.4708@ox.ac.uk> <1994Jul04.072004.4273@illinois.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Jul04.072004.4273@illinois.edu>, osilva@illinois.edu (Olga Silva) writes: > Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- === Seo-yeon González === Dept of Electrical Engineering, Demon Internet Services UK "Tape doesn't lie at 02:14. Ears do." From lito@rwth-aachen.de Tue Jul 05 14:22:04 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!rwth-aachen!lito From: lito@rwth-aachen.de (Lisa Ito) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jul05.142204.1367@rwth-aachen.de> Date: Tue, 05 Jul 1994 14:22:04 GMT References: <1994Jul01.195204.4708@ox.ac.uk> <1994Jul03.222604.2286@cmu.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jul03.222604.2286@cmu.edu>, akowalski@cmu.edu (Andrei Kowalski) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Lisa Ito "A soul is not exclusive to biology." Acorn RiscPC 600 / AmigaOS 3.1