From mlindqvist@stanford.edu Thu May 25 02:19:41 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!stanford!mlindqvist
From: mlindqvist@stanford.edu (Min-jun Lindqvist)
Newsgroups: comp.dsp
Subject: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995May25.021941.4546@stanford.edu>
Date: Thu, 25 May 1995 02:19:41 GMT
Organization: Stanford University Computer Systems Lab
NNTP-Posting-Host: stanford.edu
X-Newsreader: NewsWatcher 2.0b24
Lines: 11

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).
A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics.

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

-- 
=== Min-jun Lindqvist ===
Dept of Electrical Engineering, Stanford University Computer Systems Lab
"Row 14. No joke."

From fpetrov@titech.ac.jp Fri May 26 09:43:41 1995
Path: ashpoly!cascade!brgate!saturno!titech!fpetrov
From: fpetrov@titech.ac.jp (Freya Petrov)
Newsgroups: comp.dsp
Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995May26.094341.2236@titech.ac.jp>
Date: Fri, 26 May 1995 09:43:41 GMT
References: <1995May25.021941.4546@stanford.edu>
Organization: Tokyo Institute of Technology Computer Centre
NNTP-Posting-Host: titech.ac.jp
X-Newsreader: NewsWatcher 2.0b24
Lines: 10

In article <1995May25.021941.4546@stanford.edu>, mlindqvist@stanford.edu (Min-jun Lindqvist) writes:
> 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).

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.

-- 
Freya Petrov
Opinions expressed are solely my own and not those of Tokyo Institute of Technology Computer Centre.
------------------------------------------------------------

From kfischer@inria.fr Sun May 28 04:28:41 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!inria!kfischer
From: kfischer@inria.fr (Kirsty Fischer)
Newsgroups: comp.dsp
Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995May28.042841.9755@inria.fr>
Date: Sun, 28 May 1995 04:28:41 GMT
References: <1995May25.021941.4546@stanford.edu>
Organization: INRIA Rocquencourt
NNTP-Posting-Host: inria.fr
X-Newsreader: Netscape 1.1N
Lines: 9

In article <1995May25.021941.4546@stanford.edu>, mlindqvist@stanford.edu (Min-jun Lindqvist) writes:
> I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

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

-- 
Kirsty Fischer
Opinions expressed are solely my own and not those of INRIA Rocquencourt.
------------------------------------------------------------

From dgarcia@demon.co.uk Sun May 28 10:23:41 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!dgarcia
From: dgarcia@demon.co.uk (Dave García)
Newsgroups: comp.dsp
Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995May28.102341.1151@demon.co.uk>
Date: Sun, 28 May 1995 10:23:41 GMT
References: <1995May25.021941.4546@stanford.edu> <1995May28.042841.9755@inria.fr>
Organization: Demon Internet Services UK
NNTP-Posting-Host: demon.co.uk
X-Newsreader: NewsWatcher 2.0b24
Lines: 9

In article <1995May28.042841.9755@inria.fr>, kfischer@inria.fr (Kirsty Fischer) writes:
> Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless.

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

-- 
Dave García
Opinions expressed are solely my own and not those of Demon Internet Services UK.
------------------------------------------------------------