From svasiliev@tum.de Sun Nov 05 23:47:23 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!tum!svasiliev From: svasiliev@tum.de (Sergei Vasiliev) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov05.234723.3452@tum.de> Date: Sun, 05 Nov 1995 23:47:23 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Sergei Vasiliev -- Technische Universität München "The carrier frequency does not drift by accident." From mpetrov@clari.net Tue Nov 07 21:51:23 1995 Path: ashpoly!cascade!brgate!saturno!clari!mpetrov From: mpetrov@clari.net (Matthias Petrov) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov07.215123.4579@clari.net> Date: Tue, 07 Nov 1995 21:51:23 GMT References: <1995Nov05.234723.3452@tum.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Nov05.234723.3452@tum.de>, svasiliev@tum.de (Sergei Vasiliev) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. -- Matthias Petrov Zyxel U-1496E @ 14,400 bps "Extraordinary claims require extraordinary spectra." From mgarcia@earthlink.net Thu Nov 09 14:05:23 1995 Path: ashpoly!cascade!mxgate!coyoacan!earthlink!mgarcia From: mgarcia@earthlink.net (Marisol García) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov09.140523.3626@earthlink.net> Date: Thu, 09 Nov 1995 14:05:23 GMT References: <1995Nov05.234723.3452@tum.de> <1995Nov07.215123.4579@clari.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Nov07.215123.4579@clari.net>, mpetrov@clari.net (Matthias Petrov) 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. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Marisol García "Do not worship the copy." Sun SparcStation 20 / TOS 4.04 From tgonzalez@cam.ac.uk Fri Nov 10 07:42:23 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!tgonzalez From: tgonzalez@cam.ac.uk (Thiago González) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov10.074223.1122@cam.ac.uk> Date: Fri, 10 Nov 1995 07:42:23 GMT References: <1995Nov05.234723.3452@tum.de> <1995Nov07.215123.4579@clari.net> <1995Nov09.140523.3626@earthlink.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Nov09.140523.3626@earthlink.net>, mgarcia@earthlink.net (Marisol García) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. > Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Thiago González "The hatch is open. Is anyone listening?" 486DX4/100 (FreeBSD 2.0.5) / AmigaOS 3.1 From tsuzuki@uu.net Sun Nov 12 03:24:23 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uu!tsuzuki From: tsuzuki@uu.net (Thiago Suzuki) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov12.032423.9448@uu.net> Date: Sun, 12 Nov 1995 03:24:23 GMT References: <1995Nov05.234723.3452@tum.de> <1995Nov07.215123.4579@clari.net> <1995Nov09.140523.3626@earthlink.net> <1995Nov10.074223.1122@cam.ac.uk> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Nov10.074223.1122@cam.ac.uk>, tgonzalez@cam.ac.uk (Thiago González) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Thiago Suzuki Tape trading list upon request. SASE required for international mail.