From sperez@mit.edu Fri Jan 05 00:30:32 1996 Path: ashpoly!cascade!mxgate!coyoacan!mit!sperez From: sperez@mit.edu (Seo-yeon Pérez) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jan05.003032.1956@mit.edu> Date: Fri, 05 Jan 1996 00:30:32 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu 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. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Seo-yeon Pérez | sperez@mit.edu PGP Key fingerprint: 31FE 4E86 725D 14F3 "Keep the channels open." From sandersson@demon.co.uk Sat Jan 06 21:17:32 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!demon!sandersson From: sandersson@demon.co.uk (Seo-yeon Andersson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jan06.211732.1706@demon.co.uk> Date: Sat, 06 Jan 1996 21:17:32 GMT References: <1996Jan05.003032.1956@mit.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Jan05.003032.1956@mit.edu>, sperez@mit.edu (Seo-yeon Pérez) writes: > 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. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Seo-yeon Andersson SupraFAXModem 28.8 @ 19,200 bps "Row 14. No joke." From jmacdonald@u-tokyo.ac.jp Sun Jan 07 10:05:32 1996 Path: ashpoly!cascade!bigsur!u-tokyo!jmacdonald From: jmacdonald@u-tokyo.ac.jp (Jen MacDonald) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jan07.100532.5665@u-tokyo.ac.jp> Date: Sun, 07 Jan 1996 10:05:32 GMT References: <1996Jan05.003032.1956@mit.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Jan05.003032.1956@mit.edu>, sperez@mit.edu (Seo-yeon Pérez) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. -- Jen MacDonald -- University of Tokyo Department of Information Science "5 sigma is a discovery. 7 is a question." From fdubois@unam.mx Mon Jan 08 12:15:32 1996 Path: ashpoly!cascade!transat!ukc!fennimore!unam!fdubois From: fdubois@unam.mx (Freya Dubois) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jan08.121532.3366@unam.mx> Date: Mon, 08 Jan 1996 12:15:32 GMT References: <1996Jan05.003032.1956@mit.edu> <1996Jan06.211732.1706@demon.co.uk> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Jan06.211732.1706@demon.co.uk>, sandersson@demon.co.uk (Seo-yeon Andersson) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- Freya Dubois Tape trading list upon request. SASE required for international mail. From anakamura@earthlink.net Wed Jan 10 13:52:32 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!earthlink!anakamura From: anakamura@earthlink.net (Aiko Nakamura) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jan10.135232.7654@earthlink.net> Date: Wed, 10 Jan 1996 13:52:32 GMT References: <1996Jan05.003032.1956@mit.edu> <1996Jan06.211732.1706@demon.co.uk> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jan06.211732.1706@demon.co.uk>, sandersson@demon.co.uk (Seo-yeon Andersson) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- Aiko Nakamura | anakamura@earthlink.net PGP Key fingerprint: 9E0E 94D6 B25C EF87 "Keep the channels open."