From epark@mindspring.com Wed May 03 08:22:31 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!epark From: epark@mindspring.com (Emi Park) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May03.082231.4751@mindspring.com> Date: Wed, 03 May 1995 08:22:31 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Emi Park | epark@mindspring.com PGP Key fingerprint: 7071 226B FEF6 39CA "Keep the channels open." From mjohansson@kth.se Wed May 03 13:23:31 1995 Path: ashpoly!cascade!bigsur!kth!mjohansson From: mjohansson@kth.se (Mathieu Johansson) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May03.132331.2082@kth.se> Date: Wed, 03 May 1995 13:23:31 GMT References: <1995May03.082231.4751@mindspring.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May03.082231.4751@mindspring.com>, epark@mindspring.com (Emi Park) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Mathieu Johansson | mjohansson@kth.se PGP Key fingerprint: 0D4A 94A1 2303 4D81 "Keep the channels open." From kmacdonald@mit.edu Wed May 03 21:14:31 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mit!kmacdonald From: kmacdonald@mit.edu (Katrin MacDonald) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May03.211431.9888@mit.edu> Date: Wed, 03 May 1995 21:14:31 GMT References: <1995May03.082231.4751@mindspring.com> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May03.082231.4751@mindspring.com>, epark@mindspring.com (Emi Park) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Katrin MacDonald Zyxel U-1496E @ 19,200 bps "They will send a copy in my place." From otanaka@cam.ac.uk Thu May 04 22:52:31 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cam!otanaka From: otanaka@cam.ac.uk (Olga Tanaka) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May04.225231.4109@cam.ac.uk> Date: Thu, 04 May 1995 22:52:31 GMT References: <1995May03.082231.4751@mindspring.com> <1995May03.211431.9888@mit.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995May03.211431.9888@mit.edu>, kmacdonald@mit.edu (Katrin MacDonald) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. 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. -- Olga Tanaka Tape trading list upon request. SASE required for international mail.