From kvasiliev@earthlink.net Fri Jun 07 00:32:54 1996
Path: ashpoly!cascade!bigsur!earthlink!kvasiliev
From: kvasiliev@earthlink.net (Kenji Vasiliev)
Newsgroups: comp.dsp
Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Jun07.003254.9249@earthlink.net>
Date: Fri, 07 Jun 1996 00:32:54 GMT
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I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

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.

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

-- 
Kenji Vasiliev | kvasiliev@earthlink.net
PGP Key fingerprint: D9CD 1D81 0A48 F314
"Keep the channels open."

From jsmirnov@unam.mx Fri Jun 07 04:02:54 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!unam!jsmirnov
From: jsmirnov@unam.mx (Julien Smirnov)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Jun07.040254.3776@unam.mx>
Date: Fri, 07 Jun 1996 04:02:54 GMT
References: <1996Jun07.003254.9249@earthlink.net>
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In article <1996Jun07.003254.9249@earthlink.net>, kvasiliev@earthlink.net (Kenji 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.

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

-- 
=== Julien Smirnov ===
Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA)
"Hold for relay."

From esuzuki@cam.ac.uk Sat Jun 08 09:58:54 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!cam!esuzuki
From: esuzuki@cam.ac.uk (Élodie Suzuki)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Jun08.095854.4961@cam.ac.uk>
Date: Sat, 08 Jun 1996 09:58:54 GMT
References: <1996Jun07.003254.9249@earthlink.net> <1996Jun07.040254.3776@unam.mx>
Organization: University of Cambridge Computer Laboratory
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In article <1996Jun07.040254.3776@unam.mx>, jsmirnov@unam.mx (Julien Smirnov) writes:
> If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386.
> Top-posters will be placed in my ~/.killfile without notice.

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.

-- 
Élodie Suzuki
Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory.
------------------------------------------------------------

From dwatanabe@clari.net Sun Jun 09 18:37:54 1996
Path: ashpoly!cascade!bigsur!clari!dwatanabe
From: dwatanabe@clari.net (Diego Watanabe)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Jun09.183754.9034@clari.net>
Date: Sun, 09 Jun 1996 18:37:54 GMT
References: <1996Jun07.003254.9249@earthlink.net> <1996Jun07.040254.3776@unam.mx>
Organization: ClariNet Communications Corp
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In article <1996Jun07.040254.3776@unam.mx>, jsmirnov@unam.mx (Julien Smirnov) writes:
> If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386.
> Top-posters will be placed in my ~/.killfile without notice.

You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins.

Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns.

-- 
Diego Watanabe | dwatanabe@clari.net
PGP Key fingerprint: E1D2 32FD F55D F9A0
"Keep the channels open."