From bmoreno@hanse.de Thu Aug 18 14:52:29 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!hanse!bmoreno From: bmoreno@hanse.de (Brian Moreno) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug18.145229.8404@hanse.de> Date: Thu, 18 Aug 1994 14:52:29 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 10 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Brian Moreno Tape trading list upon request. SASE required for international mail. From tchoi@purdue.edu Sat Aug 20 12:55:29 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!purdue!tchoi From: tchoi@purdue.edu (Thiago Choi) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug20.125529.9776@purdue.edu> Date: Sat, 20 Aug 1994 12:55:29 GMT References: <1994Aug18.145229.8404@hanse.de> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Aug18.145229.8404@hanse.de>, bmoreno@hanse.de (Brian Moreno) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Thiago Choi Hayes Optima 288 @ 9600 Telebit bps "Extraordinary claims require extraordinary spectra."