From ksantos@cam.ac.uk Thu Apr 28 09:32:08 1994 Path: ashpoly!cascade!brgate!saturno!cam!ksantos From: ksantos@cam.ac.uk (Karen Santos) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr28.093208.8401@cam.ac.uk> Date: Thu, 28 Apr 1994 09:32:08 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk 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. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Karen Santos | ksantos@cam.ac.uk PGP Key fingerprint: 2660 81ED 5759 E3F1 "Keep the channels open." From tkarlsson@u-tokyo.ac.jp Fri Apr 29 17:54:08 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!u-tokyo!tkarlsson From: tkarlsson@u-tokyo.ac.jp (Takeshi Karlsson) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr29.175408.3024@u-tokyo.ac.jp> Date: Fri, 29 Apr 1994 17:54:08 GMT References: <1994Apr28.093208.8401@cam.ac.uk> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1994Apr28.093208.8401@cam.ac.uk>, ksantos@cam.ac.uk (Karen Santos) writes: > 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. 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Takeshi Karlsson Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science. ------------------------------------------------------------ From lsmirnov@ox.ac.uk Sun May 01 00:48:08 1994 Path: ashpoly!cascade!transat!ukc!fennimore!ox!lsmirnov From: lsmirnov@ox.ac.uk (Liam Smirnov) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994May01.004808.8735@ox.ac.uk> Date: Sun, 01 May 1994 00:48:08 GMT References: <1994Apr28.093208.8401@cam.ac.uk> <1994Apr29.175408.3024@u-tokyo.ac.jp> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Apr29.175408.3024@u-tokyo.ac.jp>, tkarlsson@u-tokyo.ac.jp (Takeshi Karlsson) 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. > Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. Top-posters will be placed in my ~/.killfile without notice. -- Liam Smirnov -- Oxford University Computing Laboratory "Measuring a record you own is listening, not piracy." From mnovak@purdue.edu Mon May 02 08:01:08 1994 Path: ashpoly!cascade!bigsur!purdue!mnovak From: mnovak@purdue.edu (Mateo Novak) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994May02.080108.9693@purdue.edu> Date: Mon, 02 May 1994 08:01:08 GMT References: <1994Apr28.093208.8401@cam.ac.uk> <1994Apr29.175408.3024@u-tokyo.ac.jp> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Apr29.175408.3024@u-tokyo.ac.jp>, tkarlsson@u-tokyo.ac.jp (Takeshi Karlsson) 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. > Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! -- Mateo Novak Tape trading list upon request. SASE required for international mail.