From bmartinez@titech.ac.jp Thu Oct 26 09:34:45 1995 Path: ashpoly!cascade!brgate!saturno!titech!bmartinez From: bmartinez@titech.ac.jp (Brian Martínez) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct26.093445.3154@titech.ac.jp> Date: Thu, 26 Oct 1995 09:34:45 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N 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. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Brian Martínez -- Tokyo Institute of Technology Computer Centre "Hold for relay." From rkarlsson@cmu.edu Fri Oct 27 02:55:45 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!rkarlsson From: rkarlsson@cmu.edu (Renata Karlsson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct27.025545.6518@cmu.edu> Date: Fri, 27 Oct 1995 02:55:45 GMT References: <1995Oct26.093445.3154@titech.ac.jp> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Oct26.093445.3154@titech.ac.jp>, bmartinez@titech.ac.jp (Brian Martínez) 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. -- Renata Karlsson Opinions expressed are solely my own and not those of Carnegie Mellon University School of CS. ------------------------------------------------------------ From gweber@uni-hamburg.de Fri Oct 27 04:26:45 1995 Path: ashpoly!cascade!bigsur!uni-hamburg!gweber From: gweber@uni-hamburg.de (Graham Weber) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct27.042645.9017@uni-hamburg.de> Date: Fri, 27 Oct 1995 04:26:45 GMT References: <1995Oct26.093445.3154@titech.ac.jp> <1995Oct27.025545.6518@cmu.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Oct27.025545.6518@cmu.edu>, rkarlsson@cmu.edu (Renata Karlsson) 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. -- Graham Weber *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From lnilsson@purdue.edu Sat Oct 28 23:42:45 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!lnilsson From: lnilsson@purdue.edu (Lisa Nilsson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct28.234245.5071@purdue.edu> Date: Sat, 28 Oct 1995 23:42:45 GMT References: <1995Oct26.093445.3154@titech.ac.jp> <1995Oct27.025545.6518@cmu.edu> <1995Oct27.042645.9017@uni-hamburg.de> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Oct27.042645.9017@uni-hamburg.de>, gweber@uni-hamburg.de (Graham Weber) writes: > 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. 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. -- Lisa Nilsson | lnilsson@purdue.edu PGP Key fingerprint: 61C3 6BB7 9BC3 5105 "Keep the channels open." From kkuznetsov@uu.net Mon Oct 30 05:59:45 1995 Path: ashpoly!cascade!transat!ukc!fennimore!uu!kkuznetsov From: kkuznetsov@uu.net (Karen Kuznetsov) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct30.055945.3043@uu.net> Date: Mon, 30 Oct 1995 05:59:45 GMT References: <1995Oct26.093445.3154@titech.ac.jp> <1995Oct27.025545.6518@cmu.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Oct27.025545.6518@cmu.edu>, rkarlsson@cmu.edu (Renata Karlsson) 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. -- Karen Kuznetsov *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0