From mduarte@uni-hamburg.de Sun Aug 11 18:32:27 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!mduarte From: mduarte@uni-hamburg.de (Marta Duarte) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Aug11.183227.7750@uni-hamburg.de> Date: Sun, 11 Aug 1996 18:32:27 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 10 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. 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. -- Marta Duarte -- Universität Hamburg Fachbereich Informatik "Hardware is temporary. The signal survives." From kivanov@mit.edu Mon Aug 12 10:15:27 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!mit!kivanov From: kivanov@mit.edu (Kenji Ivanov) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Aug12.101527.7199@mit.edu> Date: Mon, 12 Aug 1996 10:15:27 GMT References: <1996Aug11.183227.7750@uni-hamburg.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Aug11.183227.7750@uni-hamburg.de>, mduarte@uni-hamburg.de (Marta Duarte) writes: > 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. 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. PGP Public key available via finger or upon request. -- Kenji Ivanov -- Massachusetts Institute of Technology "In theory there is no difference between theory and practice." From mlindqvist@netcom.com Mon Aug 12 13:46:27 1996 Path: ashpoly!cascade!transat!ukc!fennimore!netcom!mlindqvist From: mlindqvist@netcom.com (Mikhail Lindqvist) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Aug12.134627.8762@netcom.com> Date: Mon, 12 Aug 1996 13:46:27 GMT References: <1996Aug11.183227.7750@uni-hamburg.de> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Aug11.183227.7750@uni-hamburg.de>, mduarte@uni-hamburg.de (Marta Duarte) writes: > 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. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Mikhail Lindqvist "The hatch is open. Is anyone listening?" Amiga 1200 (Blizzard 030/50) / AmigaOS 3.1 From hwatanabe@demon.co.uk Wed Aug 14 13:01:27 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!hwatanabe From: hwatanabe@demon.co.uk (Hana Watanabe) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Aug14.130127.3155@demon.co.uk> Date: Wed, 14 Aug 1996 13:01:27 GMT References: <1996Aug11.183227.7750@uni-hamburg.de> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Aug11.183227.7750@uni-hamburg.de>, mduarte@uni-hamburg.de (Marta Duarte) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Hana Watanabe Opinions expressed are solely my own and not those of Demon Internet Services UK. ------------------------------------------------------------ From mpetrov@earthlink.net Thu Aug 15 08:35:27 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!mpetrov From: mpetrov@earthlink.net (Morag Petrov) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Aug15.083527.4472@earthlink.net> Date: Thu, 15 Aug 1996 08:35:27 GMT References: <1996Aug11.183227.7750@uni-hamburg.de> <1996Aug12.101527.7199@mit.edu> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Aug12.101527.7199@mit.edu>, kivanov@mit.edu (Kenji Ivanov) 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. > PGP Public key available via finger or upon request. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Morag Petrov SupraFAXModem 28.8 @ 19,200 bps "In theory there is no difference between theory and practice."