From oeriksson@uu.net Thu Mar 16 21:09:13 1995 Path: ashpoly!cascade!bigsur!uu!oeriksson From: oeriksson@uu.net (Olga Eriksson) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar16.210913.8251@uu.net> Date: Thu, 16 Mar 1995 21:09:13 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net 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. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. 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. -- Olga Eriksson | oeriksson@uu.net PGP Key fingerprint: 4E4C DA71 3C5E 4D60 "Keep the channels open." From mgonzalez@clari.net Sat Mar 18 18:20:13 1995 Path: ashpoly!cascade!brgate!saturno!clari!mgonzalez From: mgonzalez@clari.net (Mathieu González) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar18.182013.5961@clari.net> Date: Sat, 18 Mar 1995 18:20:13 GMT References: <1995Mar16.210913.8251@uu.net> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Mar16.210913.8251@uu.net>, oeriksson@uu.net (Olga Eriksson) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Mathieu González *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0