From tmoreno@earthlink.net Fri Apr 14 21:09:26 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!tmoreno From: tmoreno@earthlink.net (Tobias Moreno) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Apr14.210926.6626@earthlink.net> Date: Fri, 14 Apr 1995 21:09:26 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 10 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. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Tobias Moreno Tape trading list upon request. SASE required for international mail. From mschneider@netcom.com Sun Apr 16 17:51:26 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!mschneider From: mschneider@netcom.com (Marisol Schneider) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Apr16.175126.2357@netcom.com> Date: Sun, 16 Apr 1995 17:51:26 GMT References: <1995Apr14.210926.6626@earthlink.net> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Apr14.210926.6626@earthlink.net>, tmoreno@earthlink.net (Tobias Moreno) 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. -- === Marisol Schneider === Dept of Electrical Engineering, NETCOM On-Line Communication Services "A soul is not exclusive to biology." From jrodriguez@uni-hamburg.de Tue Apr 18 17:21:26 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!jrodriguez From: jrodriguez@uni-hamburg.de (Julien Rodríguez) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Apr18.172126.8448@uni-hamburg.de> Date: Tue, 18 Apr 1995 17:21:26 GMT References: <1995Apr14.210926.6626@earthlink.net> <1995Apr16.175126.2357@netcom.com> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Apr16.175126.2357@netcom.com>, mschneider@netcom.com (Marisol Schneider) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Julien Rodríguez Practical Peripherals 14.4 @ 9600 Telebit bps "Measuring a record you own is listening, not piracy." From jgonzalez@uni-hamburg.de Wed Apr 19 04:48:26 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!jgonzalez From: jgonzalez@uni-hamburg.de (Julien González) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Apr19.044826.6871@uni-hamburg.de> Date: Wed, 19 Apr 1995 04:48:26 GMT References: <1995Apr14.210926.6626@earthlink.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Apr14.210926.6626@earthlink.net>, tmoreno@earthlink.net (Tobias Moreno) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Julien González *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0