From akowalski@cmu.edu Sat Aug 19 01:46:32 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cmu!akowalski From: akowalski@cmu.edu (Aiko Kowalski) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug19.014632.3055@cmu.edu> Date: Sat, 19 Aug 1995 01:46:32 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 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? -- Aiko Kowalski -- Carnegie Mellon University School of CS "Hold for relay." From msato@ox.ac.uk Sun Aug 20 07:42:32 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!ox!msato From: msato@ox.ac.uk (Mathieu Sato) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug20.074232.9440@ox.ac.uk> Date: Sun, 20 Aug 1995 07:42:32 GMT References: <1995Aug19.014632.3055@cmu.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Aug19.014632.3055@cmu.edu>, akowalski@cmu.edu (Aiko Kowalski) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. -- Mathieu Sato SupraFAXModem 28.8 @ 19,200 bps "The carrier frequency does not drift by accident." From dmartinez@pipeline.com Sun Aug 20 21:51:32 1995 Path: ashpoly!cascade!brgate!saturno!pipeline!dmartinez From: dmartinez@pipeline.com (Dmitri Martínez) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug20.215132.4828@pipeline.com> Date: Sun, 20 Aug 1995 21:51:32 GMT References: <1995Aug19.014632.3055@cmu.edu> <1995Aug20.074232.9440@ox.ac.uk> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Aug20.074232.9440@ox.ac.uk>, msato@ox.ac.uk (Mathieu Sato) writes: > 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. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Dmitri Martínez "We don't sign stars. We build them." 486DX4/100 (FreeBSD 2.0.5) / AmigaOS 3.1