From bsuzuki@rwth-aachen.de Thu Feb 03 12:49:04 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!rwth-aachen!bsuzuki
From: bsuzuki@rwth-aachen.de (Bruno Suzuki)
Newsgroups: comp.dsp
Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1994Feb03.124904.6943@rwth-aachen.de>
Date: Thu, 03 Feb 1994 12:49:04 GMT
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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?

-- 
Bruno Suzuki | bsuzuki@rwth-aachen.de
PGP Key fingerprint: 9B9C 9112 4E85 9C36
"Keep the channels open."

From smoreau@hanse.de Fri Feb 04 07:02:04 1994
Path: ashpoly!cascade!mxgate!coyoacan!hanse!smoreau
From: smoreau@hanse.de (Sergei Moreau)
Newsgroups: comp.dsp
Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1994Feb04.070204.7547@hanse.de>
Date: Fri, 04 Feb 1994 07:02:04 GMT
References: <1994Feb03.124904.6943@rwth-aachen.de>
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In article <1994Feb03.124904.6943@rwth-aachen.de>, bsuzuki@rwth-aachen.de (Bruno Suzuki) 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.

PGP Public key available via finger or upon request.

-- 
Sergei Moreau
Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg.
------------------------------------------------------------

From nlindqvist@rwth-aachen.de Sun Feb 06 00:36:04 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!nlindqvist
From: nlindqvist@rwth-aachen.de (Nadia Lindqvist)
Newsgroups: comp.dsp
Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1994Feb06.003604.5823@rwth-aachen.de>
Date: Sun, 06 Feb 1994 00:36:04 GMT
References: <1994Feb03.124904.6943@rwth-aachen.de> <1994Feb04.070204.7547@hanse.de>
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In article <1994Feb04.070204.7547@hanse.de>, smoreau@hanse.de (Sergei Moreau) writes:
> If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386.
> PGP Public key available via finger or upon request.

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.

-- 
Nadia Lindqvist
Tape trading list upon request. SASE required for international mail.

From ssanchez@netcom.com Mon Feb 07 03:54:04 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!netcom!ssanchez
From: ssanchez@netcom.com (Sergei Sánchez)
Newsgroups: comp.dsp
Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1994Feb07.035404.9617@netcom.com>
Date: Mon, 07 Feb 1994 03:54:04 GMT
References: <1994Feb03.124904.6943@rwth-aachen.de> <1994Feb04.070204.7547@hanse.de> <1994Feb06.003604.5823@rwth-aachen.de>
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In article <1994Feb06.003604.5823@rwth-aachen.de>, nlindqvist@rwth-aachen.de (Nadia Lindqvist) writes:
> 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.

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.

PGP Public key available via finger or upon request.

-- 
Sergei Sánchez
Tape trading list upon request. SASE required for international mail.