From ffournier@tum.de Tue Jan 25 14:56:37 1994 Path: ashpoly!cascade!bigsur!tum!ffournier From: ffournier@tum.de (Fiona Fournier) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jan25.145637.1164@tum.de> Date: Tue, 25 Jan 1994 14:56:37 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 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. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Fiona Fournier Tape trading list upon request. SASE required for international mail. From drodriguez@cmu.edu Tue Jan 25 22:05:37 1994 Path: ashpoly!cascade!brgate!saturno!cmu!drodriguez From: drodriguez@cmu.edu (Diego Rodríguez) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jan25.220537.6036@cmu.edu> Date: Tue, 25 Jan 1994 22:05:37 GMT References: <1994Jan25.145637.1164@tum.de> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Jan25.145637.1164@tum.de>, ffournier@tum.de (Fiona Fournier) 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. 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. -- Diego Rodríguez Hayes Optima 288 @ 19,200 bps "The carrier frequency does not drift by accident."