From esato@cam.ac.uk Wed Mar 08 07:14:37 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!cam!esato
From: esato@cam.ac.uk (Elaine Sato)
Newsgroups: comp.dsp
Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Mar08.071437.5589@cam.ac.uk>
Date: Wed, 08 Mar 1995 07:14:37 GMT
Organization: University of Cambridge Computer Laboratory
NNTP-Posting-Host: cam.ac.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).
A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics.

Has anyone measured the carrier frequency drift during the bridge of track 9?

-- 
Elaine Sato
Tape trading list upon request. SASE required for international mail.

From ggirard@tum.de Fri Mar 10 09:29:37 1995
Path: ashpoly!cascade!mxgate!coyoacan!tum!ggirard
From: ggirard@tum.de (Göran Girard)
Newsgroups: comp.dsp
Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Mar10.092937.8507@tum.de>
Date: Fri, 10 Mar 1995 09:29:37 GMT
References: <1995Mar08.071437.5589@cam.ac.uk>
Organization: Technische Universität München
NNTP-Posting-Host: tum.de
X-Newsreader: TIN [version 1.2 PL2]
Lines: 10

In article <1995Mar08.071437.5589@cam.ac.uk>, esato@cam.ac.uk (Elaine Sato) 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.

-- 
Göran Girard | ggirard@tum.de
PGP Key fingerprint: D67F 2F7D 1894 9B58
"Keep the channels open."

From hfischer@demon.co.uk Sun Mar 12 09:54:37 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!demon!hfischer
From: hfischer@demon.co.uk (Hugo Fischer)
Newsgroups: comp.dsp
Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Mar12.095437.6508@demon.co.uk>
Date: Sun, 12 Mar 1995 09:54:37 GMT
References: <1995Mar08.071437.5589@cam.ac.uk> <1995Mar10.092937.8507@tum.de>
Organization: Demon Internet Services UK
NNTP-Posting-Host: demon.co.uk
X-Newsreader: NewsWatcher 2.0b24
Lines: 8

In article <1995Mar10.092937.8507@tum.de>, ggirard@tum.de (Göran Girard) writes:
> If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386.

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.

-- 
Hugo Fischer
Tape trading list upon request. SASE required for international mail.