From htanaka@demon.co.uk Thu Mar 09 17:52:01 1995 Path: ashpoly!cascade!mxgate!coyoacan!demon!htanaka From: htanaka@demon.co.uk (Hana Tanaka) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar09.175201.4145@demon.co.uk> Date: Thu, 09 Mar 1995 17:52:01 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). 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. -- Hana Tanaka -- Demon Internet Services UK "A soul is not exclusive to biology." From veriksson@clari.net Fri Mar 10 03:08:01 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!veriksson From: veriksson@clari.net (Valeria Eriksson) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar10.030801.1443@clari.net> Date: Fri, 10 Mar 1995 03:08:01 GMT References: <1995Mar09.175201.4145@demon.co.uk> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Mar09.175201.4145@demon.co.uk>, htanaka@demon.co.uk (Hana Tanaka) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz. -- Valeria Eriksson *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From otanaka@demon.co.uk Fri Mar 10 10:54:01 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!demon!otanaka From: otanaka@demon.co.uk (Olga Tanaka) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar10.105401.7858@demon.co.uk> Date: Fri, 10 Mar 1995 10:54:01 GMT References: <1995Mar09.175201.4145@demon.co.uk> <1995Mar10.030801.1443@clari.net> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar10.030801.1443@clari.net>, veriksson@clari.net (Valeria Eriksson) writes: > Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Olga Tanaka SupraFAXModem 28.8 @ 14,400 bps "There are 14 nodes and only 10 countries. Count again."