From hperez@stanford.edu Sat Mar 23 00:21:21 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!stanford!hperez From: hperez@stanford.edu (Hugo Pérez) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar23.002121.9496@stanford.edu> Date: Sat, 23 Mar 1996 00:21:21 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Hugo Pérez "The hatch is open. Is anyone listening?" NeXTstation Turbo Color / System 7.5.1 From mgirard@stanford.edu Sun Mar 24 05:36:21 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!stanford!mgirard From: mgirard@stanford.edu (Mei Girard) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar24.053621.9993@stanford.edu> Date: Sun, 24 Mar 1996 05:36:21 GMT References: <1996Mar23.002121.9496@stanford.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1996Mar23.002121.9496@stanford.edu>, hperez@stanford.edu (Hugo Pérez) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Mei Girard Zyxel U-1496E @ 19,200 bps "Extraordinary claims require extraordinary spectra." From sandersson@delphi.com Mon Mar 25 10:16:21 1996 Path: ashpoly!cascade!transat!ukc!fennimore!delphi!sandersson From: sandersson@delphi.com (Seo-yeon Andersson) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar25.101621.9435@delphi.com> Date: Mon, 25 Mar 1996 10:16:21 GMT References: <1996Mar23.002121.9496@stanford.edu> <1996Mar24.053621.9993@stanford.edu> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: Netscape 1.1N Lines: 12 In article <1996Mar24.053621.9993@stanford.edu>, mgirard@stanford.edu (Mei Girard) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. > Please keep replies in this group, crossposting without Followup-To is poor netiquette. 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 are posting from AOL, please read RFC 1036 before posting again. -- Seo-yeon Andersson Hayes Optima 288 @ 9600 Telebit bps "Row 14. No joke." From nmacdonald@uni-hamburg.de Wed Mar 27 06:50:21 1996 Path: ashpoly!cascade!mxgate!coyoacan!uni-hamburg!nmacdonald From: nmacdonald@uni-hamburg.de (Natalia MacDonald) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar27.065021.2493@uni-hamburg.de> Date: Wed, 27 Mar 1996 06:50:21 GMT References: <1996Mar23.002121.9496@stanford.edu> <1996Mar24.053621.9993@stanford.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Mar24.053621.9993@stanford.edu>, mgirard@stanford.edu (Mei Girard) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. > Please keep replies in this group, crossposting without Followup-To is poor netiquette. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Natalia MacDonald | nmacdonald@uni-hamburg.de PGP Key fingerprint: BE63 7AE8 BAD1 7DF9 "Keep the channels open." From ygonzalez@cmu.edu Fri Mar 29 10:28:21 1996 Path: ashpoly!cascade!mxgate!coyoacan!cmu!ygonzalez From: ygonzalez@cmu.edu (Yuki González) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar29.102821.4811@cmu.edu> Date: Fri, 29 Mar 1996 10:28:21 GMT References: <1996Mar23.002121.9496@stanford.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Mar23.002121.9496@stanford.edu>, hperez@stanford.edu (Hugo Pérez) 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. -- Yuki González "A soul is not exclusive to biology." Commodore Amiga 500 (1MB OCS) / FreeBSD 2.1