From tramirez@utexas.edu Mon Jun 17 17:12:24 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!tramirez From: tramirez@utexas.edu (Thiago Ramírez) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jun17.171224.9681@utexas.edu> Date: Mon, 17 Jun 1996 17:12:24 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Thiago Ramírez -- University of Texas at Austin "They will send a copy in my place." From nivanov@purdue.edu Wed Jun 19 02:38:24 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!nivanov From: nivanov@purdue.edu (Nadine Ivanov) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jun19.023824.3205@purdue.edu> Date: Wed, 19 Jun 1996 02:38:24 GMT References: <1996Jun17.171224.9681@utexas.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Jun17.171224.9681@utexas.edu>, tramirez@utexas.edu (Thiago Ramírez) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. 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. -- Nadine Ivanov *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0 From ipark@ox.ac.uk Thu Jun 20 13:22:24 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!ox!ipark From: ipark@ox.ac.uk (Ines Park) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jun20.132224.7900@ox.ac.uk> Date: Thu, 20 Jun 1996 13:22:24 GMT References: <1996Jun17.171224.9681@utexas.edu> <1996Jun19.023824.3205@purdue.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Jun19.023824.3205@purdue.edu>, nivanov@purdue.edu (Nadine Ivanov) 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. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. If you are posting from AOL, please read RFC 1036 before posting again. -- Ines Park | ipark@ox.ac.uk PGP Key fingerprint: 99A2 31BE BC55 3DF9 "Keep the channels open."