From jhernandez@pipeline.com Thu May 02 06:01:16 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!pipeline!jhernandez
From: jhernandez@pipeline.com (Joachim Hernández)
Newsgroups: comp.dsp
Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996May02.060116.6312@pipeline.com>
Date: Thu, 02 May 1996 06:01:16 GMT
Organization: The Pipeline Internet Network
NNTP-Posting-Host: pipeline.com
X-Newsreader: Netscape 1.1N
Lines: 11

Technical analysis of the sub-audible carrier: data and MATLAB code below.

Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale.
This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise.

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

-- 
=== Joachim Hernández ===
Dept of Electrical Engineering, The Pipeline Internet Network
"Hardware is temporary. The signal survives."

From hnovak@unam.mx Thu May 02 21:46:16 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!hnovak
From: hnovak@unam.mx (Heather Novak)
Newsgroups: comp.dsp
Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996May02.214616.7573@unam.mx>
Date: Thu, 02 May 1996 21:46:16 GMT
References: <1996May02.060116.6312@pipeline.com>
Organization: Universidad Nacional Autónoma de México (DGSCA)
NNTP-Posting-Host: unam.mx
X-Newsreader: WinVN 0.99.5
Lines: 10

In article <1996May02.060116.6312@pipeline.com>, jhernandez@pipeline.com (Joachim Hernández) writes:
> Technical analysis of the sub-audible carrier: data and MATLAB code below.

That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text.

Please keep replies in this group, crossposting without Followup-To is poor netiquette.

-- 
Heather Novak -- Universidad Nacional Autónoma de México (DGSCA)
"Marcus is not one man."

From vschneider@utexas.edu Sat May 04 23:16:16 1996
Path: ashpoly!bigsur!pacrim!krgate!eunha!utexas!vschneider
From: vschneider@utexas.edu (Valeria Schneider)
Newsgroups: comp.dsp
Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996May04.231616.5233@utexas.edu>
Date: Sat, 04 May 1996 23:16:16 GMT
References: <1996May02.060116.6312@pipeline.com> <1996May02.214616.7573@unam.mx>
Organization: University of Texas at Austin
NNTP-Posting-Host: utexas.edu
X-Newsreader: WinVN 0.99.5
Lines: 9

In article <1996May02.214616.7573@unam.mx>, hnovak@unam.mx (Heather Novak) writes:
> That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text.

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

-- 
Valeria Schneider <vschneider@utexas.edu>
*PLONK* filter active for trolls.
Decstation 5000/200 - NetBSD 1.0