From ssokolov@mit.edu Sat Nov 04 12:54:59 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mit!ssokolov From: ssokolov@mit.edu (Sun-mi Sokolov) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov04.125459.2639@mit.edu> Date: Sat, 04 Nov 1995 12:54:59 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Sun-mi Sokolov Tape trading list upon request. SASE required for international mail. From mchoi@mindspring.com Mon Nov 06 04:41:59 1995 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!mchoi From: mchoi@mindspring.com (Min-jun Choi) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov06.044159.4408@mindspring.com> Date: Mon, 06 Nov 1995 04:41:59 GMT References: <1995Nov04.125459.2639@mit.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Nov04.125459.2639@mit.edu>, ssokolov@mit.edu (Sun-mi Sokolov) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! -- Min-jun Choi "Hold for relay." Macintosh IIfx / AmigaOS 3.1