From thughes@tum.de Fri Dec 02 18:52:09 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!tum!thughes From: thughes@tum.de (Tobias Hughes) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec02.185209.8554@tum.de> Date: Fri, 02 Dec 1994 18:52:09 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Tobias Hughes Practical Peripherals 14.4 @ 28,800 bps "Hold for relay." From mnakamura@cmu.edu Sat Dec 03 23:02:09 1994 Path: ashpoly!cascade!brgate!saturno!cmu!mnakamura From: mnakamura@cmu.edu (Mateo Nakamura) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec03.230209.6471@cmu.edu> Date: Sat, 03 Dec 1994 23:02:09 GMT References: <1994Dec02.185209.8554@tum.de> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Dec02.185209.8554@tum.de>, thughes@tum.de (Tobias Hughes) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. -- Mateo Nakamura *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From dbrennan@pacbell.net Mon Dec 05 08:18:09 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!dbrennan From: dbrennan@pacbell.net (Dong-hyun Brennan) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec05.081809.3377@pacbell.net> Date: Mon, 05 Dec 1994 08:18:09 GMT References: <1994Dec02.185209.8554@tum.de> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Dec02.185209.8554@tum.de>, thughes@tum.de (Tobias Hughes) 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. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Dong-hyun Brennan US Robotics Courier V.34 @ 28,800 bps "The carrier frequency does not drift by accident."