From krodriguez@kth.se Sun May 05 11:55:45 1996 Path: ashpoly!cascade!transat!ukc!fennimore!kth!krodriguez From: krodriguez@kth.se (Katrin Rodríguez) Newsgroups: comp.dsp Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996May05.115545.7597@kth.se> Date: Sun, 05 May 1996 11:55:45 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 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). 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. -- Katrin Rodríguez *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From glee@ox.ac.uk Tue May 07 06:33:45 1996 Path: ashpoly!cascade!transat!ukc!fennimore!ox!glee From: glee@ox.ac.uk (Graham Lee) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996May07.063345.3997@ox.ac.uk> Date: Tue, 07 May 1996 06:33:45 GMT References: <1996May05.115545.7597@kth.se> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996May05.115545.7597@kth.se>, krodriguez@kth.se (Katrin Rodríguez) writes: > 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). 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. -- Graham Lee *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0