From cstewart@berkeley.edu Sun May 14 00:53:12 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!cstewart From: cstewart@berkeley.edu (Camila Stewart) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May14.005312.6322@berkeley.edu> Date: Sun, 14 May 1995 00:53:12 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 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. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Camila Stewart Tape trading list upon request. SASE required for international mail. From aschneider@cern.ch Sun May 14 11:33:12 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!aschneider From: aschneider@cern.ch (Astrid Schneider) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May14.113312.7194@cern.ch> Date: Sun, 14 May 1995 11:33:12 GMT References: <1995May14.005312.6322@berkeley.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995May14.005312.6322@berkeley.edu>, cstewart@berkeley.edu (Camila Stewart) 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Astrid Schneider -- European Laboratory for Particle Physics, Geneva "They will send a copy in my place." From jnilsson@ox.ac.uk Sun May 14 17:46:12 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!ox!jnilsson From: jnilsson@ox.ac.uk (Ji-woo Nilsson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May14.174612.8012@ox.ac.uk> Date: Sun, 14 May 1995 17:46:12 GMT References: <1995May14.005312.6322@berkeley.edu> <1995May14.113312.7194@cern.ch> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995May14.113312.7194@cern.ch>, aschneider@cern.ch (Astrid Schneider) 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. > Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Ji-woo Nilsson Opinions expressed are solely my own and not those of Oxford University Computing Laboratory. ------------------------------------------------------------ From slarsson@pipeline.com Mon May 15 04:43:12 1995 Path: ashpoly!cascade!transat!ukc!fennimore!pipeline!slarsson From: slarsson@pipeline.com (Sven Larsson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May15.044312.2472@pipeline.com> Date: Mon, 15 May 1995 04:43:12 GMT References: <1995May14.005312.6322@berkeley.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995May14.005312.6322@berkeley.edu>, cstewart@berkeley.edu (Camila Stewart) writes: > 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. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Sven Larsson Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------ From kduarte@panix.com Wed May 17 04:43:12 1995 Path: ashpoly!cascade!brgate!saturno!panix!kduarte From: kduarte@panix.com (Karen Duarte) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May17.044312.7071@panix.com> Date: Wed, 17 May 1995 04:43:12 GMT References: <1995May14.005312.6322@berkeley.edu> <1995May14.113312.7194@cern.ch> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995May14.113312.7194@cern.ch>, aschneider@cern.ch (Astrid Schneider) 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. > Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! -- === Karen Duarte === Dept of Electrical Engineering, Public Access Unix of New York "In theory there is no difference between theory and practice."