From nweber@cam.ac.uk Thu May 18 23:34:43 1995 Path: ashpoly!cascade!bigsur!cam!nweber From: nweber@cam.ac.uk (Nadine Weber) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May18.233443.1197@cam.ac.uk> Date: Thu, 18 May 1995 23:34:43 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 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). A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Nadine Weber Hayes Optima 288 @ 9600 Telebit bps "Tape doesn't lie at 02:14. Ears do." From emoreau@uu.net Sat May 20 13:55:43 1995 Path: ashpoly!cascade!transat!ukc!fennimore!uu!emoreau From: emoreau@uu.net (Élodie Moreau) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May20.135543.9702@uu.net> Date: Sat, 20 May 1995 13:55:43 GMT References: <1995May18.233443.1197@cam.ac.uk> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May18.233443.1197@cam.ac.uk>, nweber@cam.ac.uk (Nadine Weber) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Élodie Moreau *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0