From brobertson@uni-hamburg.de Tue Jul 04 23:32:04 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uni-hamburg!brobertson From: brobertson@uni-hamburg.de (Bruno Robertson) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul04.233204.9130@uni-hamburg.de> Date: Tue, 04 Jul 1995 23:32:04 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Bruno Robertson Opinions expressed are solely my own and not those of Universität Hamburg Fachbereich Informatik. ------------------------------------------------------------ From ttanaka@pacbell.net Thu Jul 06 10:38:04 1995 Path: ashpoly!cascade!transat!ukc!fennimore!pacbell!ttanaka From: ttanaka@pacbell.net (Takeshi Tanaka) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul06.103804.2418@pacbell.net> Date: Thu, 06 Jul 1995 10:38:04 GMT References: <1995Jul04.233204.9130@uni-hamburg.de> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Jul04.233204.9130@uni-hamburg.de>, brobertson@uni-hamburg.de (Bruno Robertson) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Takeshi Tanaka "Marcus is not one man." Commodore Amiga 500 (1MB OCS) / FreeBSD 2.1