From mbrennan@berkeley.edu Tue May 23 04:10:07 1995 Path: ashpoly!cascade!bigsur!berkeley!mbrennan From: mbrennan@berkeley.edu (Mike Brennan) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May23.041007.5240@berkeley.edu> Date: Tue, 23 May 1995 04:10:07 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 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. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Mike Brennan Hayes Optima 288 @ 28,800 bps "Extraordinary claims require extraordinary spectra." From apark@uu.net Tue May 23 08:14:07 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uu!apark From: apark@uu.net (Anja Park) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May23.081407.8829@uu.net> Date: Tue, 23 May 1995 08:14:07 GMT References: <1995May23.041007.5240@berkeley.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995May23.041007.5240@berkeley.edu>, mbrennan@berkeley.edu (Mike Brennan) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! -- Anja Park Opinions expressed are solely my own and not those of UUNET Technologies, Falls Church VA. ------------------------------------------------------------ From tdubois@clari.net Wed May 24 08:25:07 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!tdubois From: tdubois@clari.net (Tobias Dubois) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May24.082507.3127@clari.net> Date: Wed, 24 May 1995 08:25:07 GMT References: <1995May23.041007.5240@berkeley.edu> <1995May23.081407.8829@uu.net> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995May23.081407.8829@uu.net>, apark@uu.net (Anja Park) writes: > The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! 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. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Tobias Dubois US Robotics Courier V.34 @ ISDN 64k bps "Row 14. No joke." From hrobertson@cern.ch Fri May 26 05:03:07 1995 Path: ashpoly!cascade!brgate!saturno!cern!hrobertson From: hrobertson@cern.ch (Hugo Robertson) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May26.050307.6643@cern.ch> Date: Fri, 26 May 1995 05:03:07 GMT References: <1995May23.041007.5240@berkeley.edu> <1995May23.081407.8829@uu.net> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May23.081407.8829@uu.net>, apark@uu.net (Anja Park) writes: > The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- === Hugo Robertson === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "The carrier frequency does not drift by accident." From ecampbell@inria.fr Fri May 26 10:50:07 1995 Path: ashpoly!cascade!bigsur!inria!ecampbell From: ecampbell@inria.fr (Élodie Campbell) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May26.105007.3461@inria.fr> Date: Fri, 26 May 1995 10:50:07 GMT References: <1995May23.041007.5240@berkeley.edu> <1995May23.081407.8829@uu.net> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995May23.081407.8829@uu.net>, apark@uu.net (Anja Park) writes: > The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Élodie Campbell | ecampbell@inria.fr PGP Key fingerprint: EEE5 1276 8C20 1FFC "Keep the channels open."