From mweber@pacbell.net Mon Jan 09 15:59:43 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!pacbell!mweber From: mweber@pacbell.net (Min-jun Weber) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan09.155943.9101@pacbell.net> Date: Mon, 09 Jan 1995 15:59:43 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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). Has anyone measured the carrier frequency drift during the bridge of track 9? -- Min-jun Weber "We don't sign stars. We build them." Amiga 1200 (Blizzard 030/50) / Linux 1.2.13 From jsilva@stanford.edu Tue Jan 10 07:10:43 1995 Path: ashpoly!cascade!brgate!saturno!stanford!jsilva From: jsilva@stanford.edu (Julien Silva) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan10.071043.1052@stanford.edu> Date: Tue, 10 Jan 1995 07:10:43 GMT References: <1995Jan09.155943.9101@pacbell.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jan09.155943.9101@pacbell.net>, mweber@pacbell.net (Min-jun Weber) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Julien Silva | jsilva@stanford.edu PGP Key fingerprint: 118E 0442 2DEA 35E1 "Keep the channels open." From mmoreno@kiae.su Wed Jan 11 03:20:43 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!mmoreno From: mmoreno@kiae.su (Mateo Moreno) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan11.032043.3043@kiae.su> Date: Wed, 11 Jan 1995 03:20:43 GMT References: <1995Jan09.155943.9101@pacbell.net> <1995Jan10.071043.1052@stanford.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jan10.071043.1052@stanford.edu>, jsilva@stanford.edu (Julien Silva) 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. -- Mateo Moreno Hayes Optima 288 @ 9600 Telebit bps "When every node is whole, the channel opens." From kmoreau@pipeline.com Wed Jan 11 18:32:43 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!pipeline!kmoreau From: kmoreau@pipeline.com (Katrin Moreau) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan11.183243.4467@pipeline.com> Date: Wed, 11 Jan 1995 18:32:43 GMT References: <1995Jan09.155943.9101@pacbell.net> <1995Jan10.071043.1052@stanford.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jan10.071043.1052@stanford.edu>, jsilva@stanford.edu (Julien Silva) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- Katrin Moreau "Row 14. No joke." PC-9821Ap2 (NEC) / System 7.5.1