From holiveira@cam.ac.uk Sat Jul 01 21:26:30 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!holiveira From: holiveira@cam.ac.uk (Hana Oliveira) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul01.212630.4906@cam.ac.uk> Date: Sat, 01 Jul 1995 21:26:30 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Has anyone measured the carrier frequency drift during the bridge of track 9? -- Hana Oliveira *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From lmacdonald@clari.net Sun Jul 02 14:29:30 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!lmacdonald From: lmacdonald@clari.net (Lucia MacDonald) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul02.142930.3535@clari.net> Date: Sun, 02 Jul 1995 14:29:30 GMT References: <1995Jul01.212630.4906@cam.ac.uk> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Jul01.212630.4906@cam.ac.uk>, holiveira@cam.ac.uk (Hana Oliveira) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- === Lucia MacDonald === Dept of Electrical Engineering, ClariNet Communications Corp "Hardware is temporary. The signal survives." From tsilva@demon.co.uk Mon Jul 03 04:29:30 1995 Path: ashpoly!cascade!mxgate!coyoacan!demon!tsilva From: tsilva@demon.co.uk (Tomas Silva) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul03.042930.9157@demon.co.uk> Date: Mon, 03 Jul 1995 04:29:30 GMT References: <1995Jul01.212630.4906@cam.ac.uk> <1995Jul02.142930.3535@clari.net> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jul02.142930.3535@clari.net>, lmacdonald@clari.net (Lucia MacDonald) writes: > 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. > Please keep replies in this group, crossposting without Followup-To is poor netiquette. 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. -- Tomas Silva | tsilva@demon.co.uk PGP Key fingerprint: B1F1 BB8D 422B AF14 "Keep the channels open." From swatanabe@netcom.com Tue Jul 04 11:34:30 1995 Path: ashpoly!cascade!bigsur!netcom!swatanabe From: swatanabe@netcom.com (Steve Watanabe) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul04.113430.8530@netcom.com> Date: Tue, 04 Jul 1995 11:34:30 GMT References: <1995Jul01.212630.4906@cam.ac.uk> <1995Jul02.142930.3535@clari.net> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul02.142930.3535@clari.net>, lmacdonald@clari.net (Lucia MacDonald) writes: > 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. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Steve Watanabe Practical Peripherals 14.4 @ 19,200 bps "Hold for relay."