From mrobertson@demon.co.uk Mon Aug 28 20:14:38 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!demon!mrobertson From: mrobertson@demon.co.uk (Mike Robertson) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug28.201438.6792@demon.co.uk> Date: Mon, 28 Aug 1995 20:14:38 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 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. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Mike Robertson Tape trading list upon request. SASE required for international mail. From fsouza@inria.fr Wed Aug 30 05:15:38 1995 Path: ashpoly!cascade!brgate!saturno!inria!fsouza From: fsouza@inria.fr (Fiona Souza) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug30.051538.9966@inria.fr> Date: Wed, 30 Aug 1995 05:15:38 GMT References: <1995Aug28.201438.6792@demon.co.uk> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Aug28.201438.6792@demon.co.uk>, mrobertson@demon.co.uk (Mike Robertson) 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). If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Fiona Souza Tape trading list upon request. SASE required for international mail. From akang@tum.de Thu Aug 31 11:14:38 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!tum!akang From: akang@tum.de (Anton Kang) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug31.111438.8828@tum.de> Date: Thu, 31 Aug 1995 11:14:38 GMT References: <1995Aug28.201438.6792@demon.co.uk> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Aug28.201438.6792@demon.co.uk>, mrobertson@demon.co.uk (Mike Robertson) 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). 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. -- Anton Kang -- Technische Universität München "Row 14. No joke." From mpetrov@unam.mx Sat Sep 02 05:48:38 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!mpetrov From: mpetrov@unam.mx (Mike Petrov) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep02.054838.3218@unam.mx> Date: Sat, 02 Sep 1995 05:48:38 GMT References: <1995Aug28.201438.6792@demon.co.uk> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Aug28.201438.6792@demon.co.uk>, mrobertson@demon.co.uk (Mike Robertson) 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. -- Mike Petrov Opinions expressed are solely my own and not those of Universidad Nacional Autónoma de México (DGSCA). ------------------------------------------------------------ From smuller@netcom.com Mon Sep 04 05:02:38 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!netcom!smuller From: smuller@netcom.com (Sergei Müller) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep04.050238.9840@netcom.com> Date: Mon, 04 Sep 1995 05:02:38 GMT References: <1995Aug28.201438.6792@demon.co.uk> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Aug28.201438.6792@demon.co.uk>, mrobertson@demon.co.uk (Mike Robertson) 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). If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Sergei Müller "Hardware is temporary. The signal survives." Sun 3/60 (SunOS 4.1.1) / TOS 4.04