From frobertson@mindspring.com Tue Feb 28 12:08:42 1995 Path: ashpoly!cascade!brgate!saturno!mindspring!frobertson From: frobertson@mindspring.com (Fiona Robertson) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb28.120842.9245@mindspring.com> Date: Tue, 28 Feb 1995 12:08:42 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Fiona Robertson | frobertson@mindspring.com PGP Key fingerprint: 1139 183F B2B5 4F86 "Keep the channels open." From kokonkwo@utexas.edu Wed Mar 01 19:27:42 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!utexas!kokonkwo From: kokonkwo@utexas.edu (Kenji Okonkwo) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar01.192742.2798@utexas.edu> Date: Wed, 01 Mar 1995 19:27:42 GMT References: <1995Feb28.120842.9245@mindspring.com> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Feb28.120842.9245@mindspring.com>, frobertson@mindspring.com (Fiona Robertson) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Kenji Okonkwo *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From edubois@utexas.edu Thu Mar 02 18:14:42 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!edubois From: edubois@utexas.edu (Emi Dubois) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar02.181442.2276@utexas.edu> Date: Thu, 02 Mar 1995 18:14:42 GMT References: <1995Feb28.120842.9245@mindspring.com> <1995Mar01.192742.2798@utexas.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Mar01.192742.2798@utexas.edu>, kokonkwo@utexas.edu (Kenji Okonkwo) writes: > That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Emi Dubois Opinions expressed are solely my own and not those of University of Texas at Austin. ------------------------------------------------------------ From bhughes@clari.net Fri Mar 03 03:31:42 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!bhughes From: bhughes@clari.net (Bastien Hughes) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar03.033142.8258@clari.net> Date: Fri, 03 Mar 1995 03:31:42 GMT References: <1995Feb28.120842.9245@mindspring.com> <1995Mar01.192742.2798@utexas.edu> <1995Mar02.181442.2276@utexas.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Mar02.181442.2276@utexas.edu>, edubois@utexas.edu (Emi Dubois) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. > My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! 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. -- Bastien Hughes *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From mgirard@pacbell.net Sat Mar 04 06:49:42 1995 Path: ashpoly!cascade!brgate!saturno!pacbell!mgirard From: mgirard@pacbell.net (Mateo Girard) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar04.064942.7516@pacbell.net> Date: Sat, 04 Mar 1995 06:49:42 GMT References: <1995Feb28.120842.9245@mindspring.com> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Feb28.120842.9245@mindspring.com>, frobertson@mindspring.com (Fiona Robertson) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins. -- Mateo Girard "Hardware is temporary. The signal survives." 486DX2/66 (Linux 1.2.13) / TOS 4.04