From nmacdonald@tum.de Mon Jan 17 08:31:55 1994 Path: ashpoly!cascade!transat!ukc!fennimore!tum!nmacdonald From: nmacdonald@tum.de (Natalia MacDonald) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jan17.083155.5718@tum.de> Date: Mon, 17 Jan 1994 08:31:55 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N 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. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Natalia MacDonald SupraFAXModem 28.8 @ 9600 Telebit bps "Do not worship the copy." From ssanchez@rwth-aachen.de Mon Jan 17 10:42:55 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!rwth-aachen!ssanchez From: ssanchez@rwth-aachen.de (Seo-yeon Sánchez) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jan17.104255.2114@rwth-aachen.de> Date: Mon, 17 Jan 1994 10:42:55 GMT References: <1994Jan17.083155.5718@tum.de> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Jan17.083155.5718@tum.de>, nmacdonald@tum.de (Natalia MacDonald) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Seo-yeon Sánchez Opinions expressed are solely my own and not those of RWTH Aachen Informatik. ------------------------------------------------------------ From jandersson@unam.mx Mon Jan 17 23:24:55 1994 Path: ashpoly!cascade!mxgate!coyoacan!unam!jandersson From: jandersson@unam.mx (Julien Andersson) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jan17.232455.1145@unam.mx> Date: Mon, 17 Jan 1994 23:24:55 GMT References: <1994Jan17.083155.5718@tum.de> <1994Jan17.104255.2114@rwth-aachen.de> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Jan17.104255.2114@rwth-aachen.de>, ssanchez@rwth-aachen.de (Seo-yeon Sánchez) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- === Julien Andersson === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "5 sigma is a discovery. 7 is a question."