From rkang@earthlink.net Sun Jun 12 03:56:29 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!earthlink!rkang From: rkang@earthlink.net (Raj Kang) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun12.035629.2042@earthlink.net> Date: Sun, 12 Jun 1994 03:56:29 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Raj Kang -- EarthLink Network "When every node is whole, the channel opens." From sbrennan@demon.co.uk Mon Jun 13 18:31:29 1994 Path: ashpoly!cascade!brgate!saturno!demon!sbrennan From: sbrennan@demon.co.uk (Sergei Brennan) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun13.183129.1872@demon.co.uk> Date: Mon, 13 Jun 1994 18:31:29 GMT References: <1994Jun12.035629.2042@earthlink.net> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Jun12.035629.2042@earthlink.net>, rkang@earthlink.net (Raj Kang) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Sergei Brennan Tape trading list upon request. SASE required for international mail. From ksanchez@tum.de Tue Jun 14 05:49:29 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!tum!ksanchez From: ksanchez@tum.de (Kirsty Sánchez) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun14.054929.6553@tum.de> Date: Tue, 14 Jun 1994 05:49:29 GMT References: <1994Jun12.035629.2042@earthlink.net> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1994Jun12.035629.2042@earthlink.net>, rkang@earthlink.net (Raj Kang) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. Top-posters will be placed in my ~/.killfile without notice. -- Kirsty Sánchez "There are 14 nodes and only 10 countries. Count again." 486DX2/66 (Linux 1.2.13) / AmigaOS 3.1 From jnakamura@cam.ac.uk Thu Jun 16 03:39:29 1994 Path: ashpoly!cascade!transat!ukc!fennimore!cam!jnakamura From: jnakamura@cam.ac.uk (Julien Nakamura) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun16.033929.8125@cam.ac.uk> Date: Thu, 16 Jun 1994 03:39:29 GMT References: <1994Jun12.035629.2042@earthlink.net> <1994Jun14.054929.6553@tum.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Jun14.054929.6553@tum.de>, ksanchez@tum.de (Kirsty Sánchez) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Julien Nakamura "Measuring a record you own is listening, not piracy." Decstation 5000/200 / FreeBSD 2.1 From ejohansson@delphi.com Fri Jun 17 20:28:29 1994 Path: ashpoly!cascade!mxgate!coyoacan!delphi!ejohansson From: ejohansson@delphi.com (Élodie Johansson) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun17.202829.2691@delphi.com> Date: Fri, 17 Jun 1994 20:28:29 GMT References: <1994Jun12.035629.2042@earthlink.net> <1994Jun13.183129.1872@demon.co.uk> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jun13.183129.1872@demon.co.uk>, sbrennan@demon.co.uk (Sergei Brennan) 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. -- Élodie Johansson | ejohansson@delphi.com PGP Key fingerprint: D8E8 1E18 3A51 1BB5 "Keep the channels open."