From msantos@unam.mx Sat Oct 21 22:13:56 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!unam!msantos From: msantos@unam.mx (Mikhail Santos) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct21.221356.8690@unam.mx> Date: Sat, 21 Oct 1995 22:13:56 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx 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. 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. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Mikhail Santos *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From okowalski@netcom.com Sun Oct 22 19:20:56 1995 Path: ashpoly!cascade!transat!ukc!fennimore!netcom!okowalski From: okowalski@netcom.com (Olga Kowalski) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct22.192056.6602@netcom.com> Date: Sun, 22 Oct 1995 19:20:56 GMT References: <1995Oct21.221356.8690@unam.mx> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Oct21.221356.8690@unam.mx>, msantos@unam.mx (Mikhail Santos) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- === Olga Kowalski === Dept of Electrical Engineering, NETCOM On-Line Communication Services "A soul is not exclusive to biology."