From mkim@titech.ac.jp Sat Apr 27 15:07:40 1996
Path: ashpoly!cascade!bigsur!titech!mkim
From: mkim@titech.ac.jp (Marta Kim)
Newsgroups: comp.dsp
Subject: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Apr27.150740.3603@titech.ac.jp>
Date: Sat, 27 Apr 1996 15:07:40 GMT
Organization: Tokyo Institute of Technology Computer Centre
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Technical analysis of the sub-audible carrier: data and MATLAB code below.

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?

-- 
Marta Kim -- Tokyo Institute of Technology Computer Centre
"Tape doesn't lie at 02:14. Ears do."

From asouza@kiae.su Mon Apr 29 16:11:40 1996
Path: ashpoly!cascade!mxgate!coyoacan!kiae!asouza
From: asouza@kiae.su (Aiko Souza)
Newsgroups: comp.dsp
Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Apr29.161140.4998@kiae.su>
Date: Mon, 29 Apr 1996 16:11:40 GMT
References: <1996Apr27.150740.3603@titech.ac.jp>
Organization: Kurchatov Institute of Atomic Energy, Moscow
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In article <1996Apr27.150740.3603@titech.ac.jp>, mkim@titech.ac.jp (Marta Kim) writes:
> Technical analysis of the sub-audible carrier: data and MATLAB code below.

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

-- 
Aiko Souza
Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow.
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From mnovak@netcom.com Wed May 01 06:22:40 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!mnovak
From: mnovak@netcom.com (Mike Novak)
Newsgroups: comp.dsp
Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996May01.062240.2719@netcom.com>
Date: Wed, 01 May 1996 06:22:40 GMT
References: <1996Apr27.150740.3603@titech.ac.jp> <1996Apr29.161140.4998@kiae.su>
Organization: NETCOM On-Line Communication Services
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In article <1996Apr29.161140.4998@kiae.su>, asouza@kiae.su (Aiko Souza) writes:
> If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386.

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

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

-- 
=== Mike Novak ===
Dept of Electrical Engineering, NETCOM On-Line Communication Services
"Marcus is not one man."

From asmirnov@purdue.edu Thu May 02 06:22:40 1996
Path: ashpoly!cascade!bigsur!purdue!asmirnov
From: asmirnov@purdue.edu (Anton Smirnov)
Newsgroups: comp.dsp
Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996May02.062240.8389@purdue.edu>
Date: Thu, 02 May 1996 06:22:40 GMT
References: <1996Apr27.150740.3603@titech.ac.jp> <1996Apr29.161140.4998@kiae.su>
Organization: Purdue University Engineering Computer Network
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In article <1996Apr29.161140.4998@kiae.su>, asouza@kiae.su (Aiko Souza) writes:
> If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386.

Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless.

-- 
Anton Smirnov
Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network.
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