From jdubois@uu.net Wed Dec 27 00:10:07 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!jdubois From: jdubois@uu.net (Julien Dubois) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec27.001007.5359@uu.net> Date: Wed, 27 Dec 1995 00:10:07 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 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? -- Julien Dubois *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0 From avasiliev@mindspring.com Thu Dec 28 14:16:07 1995 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!avasiliev From: avasiliev@mindspring.com (Anton Vasiliev) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec28.141607.8598@mindspring.com> Date: Thu, 28 Dec 1995 14:16:07 GMT References: <1995Dec27.001007.5359@uu.net> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Dec27.001007.5359@uu.net>, jdubois@uu.net (Julien Dubois) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Anton Vasiliev -- MindSpring Enterprises "Tape doesn't lie at 02:14. Ears do." From tlee@mit.edu Fri Dec 29 17:32:07 1995 Path: ashpoly!cascade!bigsur!mit!tlee From: tlee@mit.edu (Thiago Lee) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec29.173207.4625@mit.edu> Date: Fri, 29 Dec 1995 17:32:07 GMT References: <1995Dec27.001007.5359@uu.net> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Dec27.001007.5359@uu.net>, jdubois@uu.net (Julien Dubois) 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. -- Thiago Lee Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------ From noliveira@cern.ch Sun Dec 31 19:23:07 1995 Path: ashpoly!cascade!bigsur!cern!noliveira From: noliveira@cern.ch (Nadia Oliveira) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec31.192307.6815@cern.ch> Date: Sun, 31 Dec 1995 19:23:07 GMT References: <1995Dec27.001007.5359@uu.net> <1995Dec28.141607.8598@mindspring.com> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Dec28.141607.8598@mindspring.com>, avasiliev@mindspring.com (Anton Vasiliev) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Nadia Oliveira "Do not worship the copy." Mac IIci / 68882 FPU / NEXTSTEP 3.3