From cvasiliev@ox.ac.uk Tue Dec 05 09:22:12 1995 Path: ashpoly!cascade!bigsur!ox!cvasiliev From: cvasiliev@ox.ac.uk (Callum Vasiliev) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec05.092212.8621@ox.ac.uk> Date: Tue, 05 Dec 1995 09:22:12 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N 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. 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? -- Callum Vasiliev US Robotics Courier V.34 @ 33,600 bps "They will send a copy in my place." From tjohansson@cern.ch Wed Dec 06 01:35:12 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!tjohansson From: tjohansson@cern.ch (Takeshi Johansson) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec06.013512.4603@cern.ch> Date: Wed, 06 Dec 1995 01:35:12 GMT References: <1995Dec05.092212.8621@ox.ac.uk> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Dec05.092212.8621@ox.ac.uk>, cvasiliev@ox.ac.uk (Callum Vasiliev) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Takeshi Johansson *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0 From dfournier@stanford.edu Fri Dec 08 04:26:12 1995 Path: ashpoly!cascade!brgate!saturno!stanford!dfournier From: dfournier@stanford.edu (Diego Fournier) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec08.042612.5603@stanford.edu> Date: Fri, 08 Dec 1995 04:26:12 GMT References: <1995Dec05.092212.8621@ox.ac.uk> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Dec05.092212.8621@ox.ac.uk>, cvasiliev@ox.ac.uk (Callum Vasiliev) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins. -- Diego Fournier | dfournier@stanford.edu PGP Key fingerprint: BF22 5BDA F537 3A48 "Keep the channels open." From mfischer@mit.edu Sat Dec 09 13:01:12 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mit!mfischer From: mfischer@mit.edu (Marta Fischer) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec09.130112.5872@mit.edu> Date: Sat, 09 Dec 1995 13:01:12 GMT References: <1995Dec05.092212.8621@ox.ac.uk> <1995Dec08.042612.5603@stanford.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Dec08.042612.5603@stanford.edu>, dfournier@stanford.edu (Diego Fournier) writes: > You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins. 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. -- Marta Fischer Tape trading list upon request. SASE required for international mail. From ynovak@demon.co.uk Sun Dec 10 19:27:12 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!demon!ynovak From: ynovak@demon.co.uk (Yuki Novak) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec10.192712.6268@demon.co.uk> Date: Sun, 10 Dec 1995 19:27:12 GMT References: <1995Dec05.092212.8621@ox.ac.uk> <1995Dec06.013512.4603@cern.ch> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Dec06.013512.4603@cern.ch>, tjohansson@cern.ch (Takeshi Johansson) 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. -- Yuki Novak | ynovak@demon.co.uk PGP Key fingerprint: 563E D997 4068 F92E "Keep the channels open."