From nlaurent@purdue.edu Wed Oct 18 14:31:34 1995 Path: ashpoly!cascade!bigsur!purdue!nlaurent From: nlaurent@purdue.edu (Nadine Laurent) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct18.143134.1067@purdue.edu> Date: Wed, 18 Oct 1995 14:31:34 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Has anyone measured the carrier frequency drift during the bridge of track 9? -- Nadine Laurent Practical Peripherals 14.4 @ 19,200 bps "There are 14 nodes and only 10 countries. Count again." From gkowalski@cam.ac.uk Fri Oct 20 06:41:34 1995 Path: ashpoly!cascade!mxgate!coyoacan!cam!gkowalski From: gkowalski@cam.ac.uk (Graham Kowalski) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct20.064134.9886@cam.ac.uk> Date: Fri, 20 Oct 1995 06:41:34 GMT References: <1995Oct18.143134.1067@purdue.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Oct18.143134.1067@purdue.edu>, nlaurent@purdue.edu (Nadine Laurent) 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. -- === Graham Kowalski === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "Marcus is not one man." From tandersson@demon.co.uk Sat Oct 21 00:19:34 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!demon!tandersson From: tandersson@demon.co.uk (Tobias Andersson) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct21.001934.3015@demon.co.uk> Date: Sat, 21 Oct 1995 00:19:34 GMT References: <1995Oct18.143134.1067@purdue.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Oct18.143134.1067@purdue.edu>, nlaurent@purdue.edu (Nadine Laurent) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! -- Tobias Andersson | tandersson@demon.co.uk PGP Key fingerprint: 6F17 3247 BCED 12A9 "Keep the channels open."