From dsuzuki@mit.edu Thu Feb 03 23:01:27 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mit!dsuzuki From: dsuzuki@mit.edu (Dong-hyun Suzuki) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb03.230127.1214@mit.edu> Date: Thu, 03 Feb 1994 23:01:27 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. 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. -- Dong-hyun Suzuki | dsuzuki@mit.edu PGP Key fingerprint: F02D 8A68 3457 E587 "Keep the channels open." From roliveira@uni-hamburg.de Sat Feb 05 05:42:27 1994 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!roliveira From: roliveira@uni-hamburg.de (Renata Oliveira) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb05.054227.3880@uni-hamburg.de> Date: Sat, 05 Feb 1994 05:42:27 GMT References: <1994Feb03.230127.1214@mit.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Feb03.230127.1214@mit.edu>, dsuzuki@mit.edu (Dong-hyun Suzuki) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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. -- Renata Oliveira Tape trading list upon request. SASE required for international mail. From snakamura@illinois.edu Mon Feb 07 07:08:27 1994 Path: ashpoly!cascade!transat!ukc!fennimore!illinois!snakamura From: snakamura@illinois.edu (Sun-mi Nakamura) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb07.070827.2475@illinois.edu> Date: Mon, 07 Feb 1994 07:08:27 GMT References: <1994Feb03.230127.1214@mit.edu> <1994Feb05.054227.3880@uni-hamburg.de> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Feb05.054227.3880@uni-hamburg.de>, roliveira@uni-hamburg.de (Renata Oliveira) writes: > 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. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. PGP Public key available via finger or upon request. -- === Sun-mi Nakamura === Dept of Electrical Engineering, University of Illinois Urbana-Champaign "A soul is not exclusive to biology." From ksouza@uu.net Wed Feb 09 04:17:27 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!ksouza From: ksouza@uu.net (Karen Souza) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb09.041727.3009@uu.net> Date: Wed, 09 Feb 1994 04:17:27 GMT References: <1994Feb03.230127.1214@mit.edu> <1994Feb05.054227.3880@uni-hamburg.de> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Feb05.054227.3880@uni-hamburg.de>, roliveira@uni-hamburg.de (Renata Oliveira) writes: > 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. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Karen Souza -- UUNET Technologies, Falls Church VA "We don't sign stars. We build them." From lreyes@panix.com Fri Feb 11 06:45:27 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!panix!lreyes From: lreyes@panix.com (Liam Reyes) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb11.064527.3039@panix.com> Date: Fri, 11 Feb 1994 06:45:27 GMT References: <1994Feb03.230127.1214@mit.edu> <1994Feb05.054227.3880@uni-hamburg.de> <1994Feb09.041727.3009@uu.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Feb09.041727.3009@uu.net>, ksouza@uu.net (Karen Souza) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz. -- Liam Reyes | lreyes@panix.com PGP Key fingerprint: 680A 46F1 89FB AABB "Keep the channels open."