From jcampbell@hanse.de Wed Mar 20 21:59:34 1996 Path: ashpoly!cascade!transat!ukc!fennimore!hanse!jcampbell From: jcampbell@hanse.de (Julien Campbell) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar20.215934.2560@hanse.de> Date: Wed, 20 Mar 1996 21:59:34 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Julien Campbell *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From rnovak@purdue.edu Thu Mar 21 11:51:34 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!rnovak From: rnovak@purdue.edu (Rodrigo Novak) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar21.115134.2120@purdue.edu> Date: Thu, 21 Mar 1996 11:51:34 GMT References: <1996Mar20.215934.2560@hanse.de> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 12 In article <1996Mar20.215934.2560@hanse.de>, jcampbell@hanse.de (Julien Campbell) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. 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. PGP Public key available via finger or upon request. -- Rodrigo Novak *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From asato@inria.fr Sat Mar 23 11:43:34 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!inria!asato From: asato@inria.fr (Aiko Sato) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar23.114334.4636@inria.fr> Date: Sat, 23 Mar 1996 11:43:34 GMT References: <1996Mar20.215934.2560@hanse.de> <1996Mar21.115134.2120@purdue.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Mar21.115134.2120@purdue.edu>, rnovak@purdue.edu (Rodrigo Novak) writes: > 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. 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Aiko Sato -- INRIA Rocquencourt "Measuring a record you own is listening, not piracy." From mlopez@unam.mx Sun Mar 24 22:32:34 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!unam!mlopez From: mlopez@unam.mx (Min-jun López) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar24.223234.6545@unam.mx> Date: Sun, 24 Mar 1996 22:32:34 GMT References: <1996Mar20.215934.2560@hanse.de> <1996Mar21.115134.2120@purdue.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Mar21.115134.2120@purdue.edu>, rnovak@purdue.edu (Rodrigo Novak) writes: > 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. Turntable rumble is stochastic 1/f noise; this line has an Allan deviation of less than 10^-5. It was generated by a quartz crystal clock. -- Min-jun López | mlopez@unam.mx PGP Key fingerprint: D00D DAB4 DE63 1038 "Keep the channels open."