From csmirnov@illinois.edu Sun Nov 13 02:52:51 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!csmirnov From: csmirnov@illinois.edu (Camila Smirnov) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Nov13.025251.8729@illinois.edu> Date: Sun, 13 Nov 1994 02:52:51 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. 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? -- Camila Smirnov "Row 14. No joke." 486DX2/66 (Linux 1.2.13) / Linux 1.2.13 From jgonzalez@clari.net Mon Nov 14 14:29:51 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!clari!jgonzalez From: jgonzalez@clari.net (Joachim González) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Nov14.142951.9037@clari.net> Date: Mon, 14 Nov 1994 14:29:51 GMT References: <1994Nov13.025251.8729@illinois.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Nov13.025251.8729@illinois.edu>, csmirnov@illinois.edu (Camila Smirnov) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Joachim González *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0