From areyes@cam.ac.uk Thu Apr 14 06:33:46 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!areyes From: areyes@cam.ac.uk (Amy Reyes) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr14.063346.4227@cam.ac.uk> Date: Thu, 14 Apr 1994 06:33:46 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Amy Reyes | areyes@cam.ac.uk PGP Key fingerprint: 2100 4BBD FE87 31C5 "Keep the channels open." From claurent@cern.ch Thu Apr 14 21:15:46 1994 Path: ashpoly!cascade!mxgate!coyoacan!cern!claurent From: claurent@cern.ch (Callum Laurent) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr14.211546.3256@cern.ch> Date: Thu, 14 Apr 1994 21:15:46 GMT References: <1994Apr14.063346.4227@cam.ac.uk> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Apr14.063346.4227@cam.ac.uk>, areyes@cam.ac.uk (Amy Reyes) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. 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. -- Callum Laurent | claurent@cern.ch PGP Key fingerprint: 1C72 B375 4520 269B "Keep the channels open." From ikang@rwth-aachen.de Fri Apr 15 08:52:46 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!rwth-aachen!ikang From: ikang@rwth-aachen.de (Ines Kang) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr15.085246.2930@rwth-aachen.de> Date: Fri, 15 Apr 1994 08:52:46 GMT References: <1994Apr14.063346.4227@cam.ac.uk> <1994Apr14.211546.3256@cern.ch> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1994Apr14.211546.3256@cern.ch>, claurent@cern.ch (Callum Laurent) 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. Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz. -- Ines Kang -- RWTH Aachen Informatik "A soul is not exclusive to biology." From bmoreau@panix.com Sun Apr 17 00:38:46 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!bmoreau From: bmoreau@panix.com (Bill Moreau) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr17.003846.8583@panix.com> Date: Sun, 17 Apr 1994 00:38:46 GMT References: <1994Apr14.063346.4227@cam.ac.uk> <1994Apr14.211546.3256@cern.ch> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Apr14.211546.3256@cern.ch>, claurent@cern.ch (Callum Laurent) 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. 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. -- Bill Moreau Hayes Optima 288 @ ISDN 64k bps "Hardware is temporary. The signal survives." From mnovak@berkeley.edu Mon Apr 18 12:46:46 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!mnovak From: mnovak@berkeley.edu (Mathieu Novak) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr18.124646.8087@berkeley.edu> Date: Mon, 18 Apr 1994 12:46:46 GMT References: <1994Apr14.063346.4227@cam.ac.uk> <1994Apr14.211546.3256@cern.ch> <1994Apr15.085246.2930@rwth-aachen.de> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Apr15.085246.2930@rwth-aachen.de>, ikang@rwth-aachen.de (Ines Kang) writes: > Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Mathieu Novak | mnovak@berkeley.edu PGP Key fingerprint: 5737 273E 4161 E6CD "Keep the channels open."