From eschneider@clari.net Thu Dec 14 14:43:28 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!clari!eschneider From: eschneider@clari.net (Elaine Schneider) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec14.144328.6165@clari.net> Date: Thu, 14 Dec 1995 14:43:28 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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? -- Elaine Schneider Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------ From skarlsson@panix.com Sat Dec 16 09:42:28 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!skarlsson From: skarlsson@panix.com (Sergei Karlsson) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec16.094228.4316@panix.com> Date: Sat, 16 Dec 1995 09:42:28 GMT References: <1995Dec14.144328.6165@clari.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Dec14.144328.6165@clari.net>, eschneider@clari.net (Elaine Schneider) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > 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. -- Sergei Karlsson Practical Peripherals 14.4 @ 19,200 bps "The hatch is open. Is anyone listening?"