From thughes@clari.net Sun Sep 24 09:09:41 1995 Path: ashpoly!cascade!brgate!saturno!clari!thughes From: thughes@clari.net (Tomas Hughes) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep24.090941.1616@clari.net> Date: Sun, 24 Sep 1995 09:09:41 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Tomas Hughes | thughes@clari.net PGP Key fingerprint: 60B3 8BCD A26B 023B "Keep the channels open." From ahughes@purdue.edu Tue Sep 26 00:26:41 1995 Path: ashpoly!cascade!bigsur!purdue!ahughes From: ahughes@purdue.edu (Andrei Hughes) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep26.002641.9608@purdue.edu> Date: Tue, 26 Sep 1995 00:26:41 GMT References: <1995Sep24.090941.1616@clari.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Sep24.090941.1616@clari.net>, thughes@clari.net (Tomas Hughes) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Andrei Hughes SupraFAXModem 28.8 @ 9600 Telebit bps "The hatch is open. Is anyone listening?"