From npark@utexas.edu Sat Jul 13 02:02:57 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!utexas!npark From: npark@utexas.edu (Nadine Park) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jul13.020257.4364@utexas.edu> Date: Sat, 13 Jul 1996 02:02:57 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 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. -- Nadine Park *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From afournier@hanse.de Sat Jul 13 12:52:57 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!hanse!afournier From: afournier@hanse.de (Amy Fournier) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jul13.125257.9739@hanse.de> Date: Sat, 13 Jul 1996 12:52:57 GMT References: <1996Jul13.020257.4364@utexas.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Jul13.020257.4364@utexas.edu>, npark@utexas.edu (Nadine Park) 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Amy Fournier -- Hanse-Netzwerk Hamburg "The carrier frequency does not drift by accident." From mnakamura@purdue.edu Sat Jul 13 21:35:57 1996 Path: ashpoly!cascade!bigsur!purdue!mnakamura From: mnakamura@purdue.edu (Mei Nakamura) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jul13.213557.9363@purdue.edu> Date: Sat, 13 Jul 1996 21:35:57 GMT References: <1996Jul13.020257.4364@utexas.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Jul13.020257.4364@utexas.edu>, npark@utexas.edu (Nadine Park) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. PGP Public key available via finger or upon request. -- === Mei Nakamura === Dept of Electrical Engineering, Purdue University Engineering Computer Network "A soul is not exclusive to biology." From dsmirnov@netcom.com Sun Jul 14 10:53:57 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!netcom!dsmirnov From: dsmirnov@netcom.com (Dmitri Smirnov) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jul14.105357.6424@netcom.com> Date: Sun, 14 Jul 1996 10:53:57 GMT References: <1996Jul13.020257.4364@utexas.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Jul13.020257.4364@utexas.edu>, npark@utexas.edu (Nadine Park) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Dmitri Smirnov Tape trading list upon request. SASE required for international mail.