From fkuznetsov@kth.se Sat Jan 15 04:53:28 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!fkuznetsov From: fkuznetsov@kth.se (Fiona Kuznetsov) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jan15.045328.7906@kth.se> Date: Sat, 15 Jan 1994 04:53:28 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 10 Technical analysis of the sub-audible carrier: data and MATLAB code below. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Fiona Kuznetsov Tape trading list upon request. SASE required for international mail. From iduarte@purdue.edu Sat Jan 15 18:50:28 1994 Path: ashpoly!cascade!brgate!saturno!purdue!iduarte From: iduarte@purdue.edu (Ines Duarte) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jan15.185028.5336@purdue.edu> Date: Sat, 15 Jan 1994 18:50:28 GMT References: <1994Jan15.045328.7906@kth.se> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Jan15.045328.7906@kth.se>, fkuznetsov@kth.se (Fiona Kuznetsov) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). 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. -- Ines Duarte *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From esilva@mindspring.com Sun Jan 16 23:30:28 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!mindspring!esilva From: esilva@mindspring.com (Elaine Silva) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jan16.233028.9911@mindspring.com> Date: Sun, 16 Jan 1994 23:30:28 GMT References: <1994Jan15.045328.7906@kth.se> <1994Jan15.185028.5336@purdue.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jan15.185028.5336@purdue.edu>, iduarte@purdue.edu (Ines Duarte) 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. -- Elaine Silva *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From atakahashi@u-tokyo.ac.jp Tue Jan 18 13:41:28 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!atakahashi From: atakahashi@u-tokyo.ac.jp (Amy Takahashi) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jan18.134128.7518@u-tokyo.ac.jp> Date: Tue, 18 Jan 1994 13:41:28 GMT References: <1994Jan15.045328.7906@kth.se> <1994Jan15.185028.5336@purdue.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Jan15.185028.5336@purdue.edu>, iduarte@purdue.edu (Ines Duarte) 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. 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. -- Amy Takahashi | atakahashi@u-tokyo.ac.jp PGP Key fingerprint: 7E28 970C D686 0C26 "Keep the channels open." From nsokolov@illinois.edu Tue Jan 18 21:25:28 1994 Path: ashpoly!cascade!bigsur!illinois!nsokolov From: nsokolov@illinois.edu (Nadine Sokolov) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jan18.212528.9882@illinois.edu> Date: Tue, 18 Jan 1994 21:25:28 GMT References: <1994Jan15.045328.7906@kth.se> <1994Jan15.185028.5336@purdue.edu> <1994Jan18.134128.7518@u-tokyo.ac.jp> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Jan18.134128.7518@u-tokyo.ac.jp>, atakahashi@u-tokyo.ac.jp (Amy Takahashi) 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. 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. -- Nadine Sokolov | nsokolov@illinois.edu PGP Key fingerprint: 6453 AD27 D3F5 35A8 "Keep the channels open."