From geriksson@uni-hamburg.de Sat Sep 02 11:30:54 1995 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!geriksson From: geriksson@uni-hamburg.de (Graham Eriksson) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep02.113054.6933@uni-hamburg.de> Date: Sat, 02 Sep 1995 11:30:54 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Graham Eriksson | geriksson@uni-hamburg.de PGP Key fingerprint: A3DB 960A D9CD 3A4D "Keep the channels open." From bfournier@mit.edu Sun Sep 03 11:20:54 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!bfournier From: bfournier@mit.edu (Bastien Fournier) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep03.112054.9571@mit.edu> Date: Sun, 03 Sep 1995 11:20:54 GMT References: <1995Sep02.113054.6933@uni-hamburg.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Sep02.113054.6933@uni-hamburg.de>, geriksson@uni-hamburg.de (Graham Eriksson) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. -- === Bastien Fournier === Dept of Electrical Engineering, Massachusetts Institute of Technology "Marcus is not one man." From slee@mit.edu Mon Sep 04 09:21:54 1995 Path: ashpoly!cascade!mxgate!coyoacan!mit!slee From: slee@mit.edu (Sun-mi Lee) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep04.092154.6543@mit.edu> Date: Mon, 04 Sep 1995 09:21:54 GMT References: <1995Sep02.113054.6933@uni-hamburg.de> <1995Sep03.112054.9571@mit.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Sep03.112054.9571@mit.edu>, bfournier@mit.edu (Bastien Fournier) 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. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Sun-mi Lee Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------ From slaurent@panix.com Tue Sep 05 00:22:54 1995 Path: ashpoly!cascade!mxgate!coyoacan!panix!slaurent From: slaurent@panix.com (Seo-yeon Laurent) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep05.002254.5947@panix.com> Date: Tue, 05 Sep 1995 00:22:54 GMT References: <1995Sep02.113054.6933@uni-hamburg.de> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Sep02.113054.6933@uni-hamburg.de>, geriksson@uni-hamburg.de (Graham Eriksson) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > 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. -- Seo-yeon Laurent Opinions expressed are solely my own and not those of Public Access Unix of New York. ------------------------------------------------------------ From dsuzuki@delphi.com Wed Sep 06 07:52:54 1995 Path: ashpoly!cascade!brgate!saturno!delphi!dsuzuki From: dsuzuki@delphi.com (Dmitri Suzuki) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep06.075254.7600@delphi.com> Date: Wed, 06 Sep 1995 07:52:54 GMT References: <1995Sep02.113054.6933@uni-hamburg.de> <1995Sep05.002254.5947@panix.com> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Sep05.002254.5947@panix.com>, slaurent@panix.com (Seo-yeon 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. -- Dmitri Suzuki Opinions expressed are solely my own and not those of Delphi Internet Services. ------------------------------------------------------------