From blee@u-tokyo.ac.jp Wed Nov 15 01:22:21 1995 Path: ashpoly!cascade!bigsur!u-tokyo!blee From: blee@u-tokyo.ac.jp (Bruno Lee) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov15.012221.2688@u-tokyo.ac.jp> Date: Wed, 15 Nov 1995 01:22:21 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Bruno Lee *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From lsato@earthlink.net Thu Nov 16 02:51:21 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!lsato From: lsato@earthlink.net (Lars Sato) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov16.025121.3585@earthlink.net> Date: Thu, 16 Nov 1995 02:51:21 GMT References: <1995Nov15.012221.2688@u-tokyo.ac.jp> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Nov15.012221.2688@u-tokyo.ac.jp>, blee@u-tokyo.ac.jp (Bruno Lee) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. 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. -- Lars Sato | lsato@earthlink.net PGP Key fingerprint: 2BA4 16C1 B1E6 34C9 "Keep the channels open." From rchoi@cam.ac.uk Thu Nov 16 09:53:21 1995 Path: ashpoly!cascade!mxgate!coyoacan!cam!rchoi From: rchoi@cam.ac.uk (Raj Choi) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov16.095321.9594@cam.ac.uk> Date: Thu, 16 Nov 1995 09:53:21 GMT References: <1995Nov15.012221.2688@u-tokyo.ac.jp> <1995Nov16.025121.3585@earthlink.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Nov16.025121.3585@earthlink.net>, lsato@earthlink.net (Lars Sato) 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. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Raj Choi *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From ygarcia@ox.ac.uk Thu Nov 16 14:33:21 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!ox!ygarcia From: ygarcia@ox.ac.uk (Yuki García) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov16.143321.2617@ox.ac.uk> Date: Thu, 16 Nov 1995 14:33:21 GMT References: <1995Nov15.012221.2688@u-tokyo.ac.jp> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Nov15.012221.2688@u-tokyo.ac.jp>, blee@u-tokyo.ac.jp (Bruno Lee) 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. -- Yuki García "The carrier frequency does not drift by accident." Sun 3/60 (SunOS 4.1.1) / TOS 4.04