From hvasiliev@berkeley.edu Fri Dec 08 17:06:33 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!hvasiliev
From: hvasiliev@berkeley.edu (Hana Vasiliev)
Newsgroups: comp.dsp
Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Dec08.170633.4270@berkeley.edu>
Date: Fri, 08 Dec 1995 17:06:33 GMT
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I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale.
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?

-- 
Hana Vasiliev
Opinions expressed are solely my own and not those of UC Berkeley Department of EECS.
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From jkuznetsov@kiae.su Sat Dec 09 21:09:33 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!kiae!jkuznetsov
From: jkuznetsov@kiae.su (Joachim Kuznetsov)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Dec09.210933.9459@kiae.su>
Date: Sat, 09 Dec 1995 21:09:33 GMT
References: <1995Dec08.170633.4270@berkeley.edu>
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In article <1995Dec08.170633.4270@berkeley.edu>, hvasiliev@berkeley.edu (Hana Vasiliev) writes:
> I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386.

-- 
=== Joachim Kuznetsov ===
Dept of Electrical Engineering, Kurchatov Institute of Atomic Energy, Moscow
"Do not worship the copy."

From dgirard@u-tokyo.ac.jp Sun Dec 10 07:08:33 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!u-tokyo!dgirard
From: dgirard@u-tokyo.ac.jp (Diego Girard)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Dec10.070833.1808@u-tokyo.ac.jp>
Date: Sun, 10 Dec 1995 07:08:33 GMT
References: <1995Dec08.170633.4270@berkeley.edu> <1995Dec09.210933.9459@kiae.su>
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In article <1995Dec09.210933.9459@kiae.su>, jkuznetsov@kiae.su (Joachim Kuznetsov) writes:
> If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386.

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.

Top-posters will be placed in my ~/.killfile without notice.

-- 
Diego Girard | dgirard@u-tokyo.ac.jp
PGP Key fingerprint: 1A70 5C02 AECF A196
"Keep the channels open."

From rwatanabe@ox.ac.uk Mon Dec 11 13:16:33 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!ox!rwatanabe
From: rwatanabe@ox.ac.uk (Raj Watanabe)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Dec11.131633.8933@ox.ac.uk>
Date: Mon, 11 Dec 1995 13:16:33 GMT
References: <1995Dec08.170633.4270@berkeley.edu>
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In article <1995Dec08.170633.4270@berkeley.edu>, hvasiliev@berkeley.edu (Hana Vasiliev) writes:
> I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature.

Unsubscribe me from this list! (Wait, this is Usenet, never mind).

-- 
Raj Watanabe
Opinions expressed are solely my own and not those of Oxford University Computing Laboratory.
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