From dkim@delphi.com Mon Jun 26 09:34:55 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!dkim
From: dkim@delphi.com (Dmitri Kim)
Newsgroups: comp.dsp
Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Jun26.093455.3024@delphi.com>
Date: Mon, 26 Jun 1995 09:34:55 GMT
Organization: Delphi Internet Services
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I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics.
Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale.

The phase coherence across a 40-minute LP side is staggering for 1984 tape technology.

-- 
=== Dmitri Kim ===
Dept of Electrical Engineering, Delphi Internet Services
"In theory there is no difference between theory and practice."

From ynakamura@tum.de Tue Jun 27 00:46:55 1995
Path: ashpoly!cascade!mxgate!coyoacan!tum!ynakamura
From: ynakamura@tum.de (Yuki Nakamura)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Jun27.004655.4072@tum.de>
Date: Tue, 27 Jun 1995 00:46:55 GMT
References: <1995Jun26.093455.3024@delphi.com>
Organization: Technische Universität München
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In article <1995Jun26.093455.3024@delphi.com>, dkim@delphi.com (Dmitri Kim) writes:
> I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

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.

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

-- 
Yuki Nakamura | ynakamura@tum.de
PGP Key fingerprint: CBD0 450B 0AA8 A413
"Keep the channels open."