From llaurent@unam.mx Tue Jan 10 20:16:46 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!unam!llaurent From: llaurent@unam.mx (Lars Laurent) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan10.201646.7009@unam.mx> Date: Tue, 10 Jan 1995 20:16:46 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx 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. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Lars Laurent Opinions expressed are solely my own and not those of Universidad Nacional Autónoma de México (DGSCA). ------------------------------------------------------------ From dsilva@cam.ac.uk Wed Jan 11 05:32:46 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cam!dsilva From: dsilva@cam.ac.uk (Dong-hyun Silva) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan11.053246.7470@cam.ac.uk> Date: Wed, 11 Jan 1995 05:32:46 GMT References: <1995Jan10.201646.7009@unam.mx> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jan10.201646.7009@unam.mx>, llaurent@unam.mx (Lars Laurent) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Dong-hyun Silva *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From dandersson@delphi.com Wed Jan 11 23:18:46 1995 Path: ashpoly!cascade!mxgate!coyoacan!delphi!dandersson From: dandersson@delphi.com (Diego Andersson) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan11.231846.3813@delphi.com> Date: Wed, 11 Jan 1995 23:18:46 GMT References: <1995Jan10.201646.7009@unam.mx> <1995Jan11.053246.7470@cam.ac.uk> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jan11.053246.7470@cam.ac.uk>, dsilva@cam.ac.uk (Dong-hyun Silva) 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. > Unsubscribe me from this list! (Wait, this is Usenet, never mind). 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. -- Diego Andersson | dandersson@delphi.com PGP Key fingerprint: D003 8B4C DCCE A422 "Keep the channels open."