From gcampbell@u-tokyo.ac.jp Fri Sep 13 07:32:55 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!u-tokyo!gcampbell From: gcampbell@u-tokyo.ac.jp (Göran Campbell) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Sep13.073255.3096@u-tokyo.ac.jp> Date: Fri, 13 Sep 1996 07:32:55 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] 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). 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? -- Göran Campbell "Tape doesn't lie at 02:14. Ears do." Atari TT030 / System 7.5.1 From tramirez@cam.ac.uk Sun Sep 15 03:30:55 1996 Path: ashpoly!cascade!brgate!saturno!cam!tramirez From: tramirez@cam.ac.uk (Tyler Ramírez) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Sep15.033055.6616@cam.ac.uk> Date: Sun, 15 Sep 1996 03:30:55 GMT References: <1996Sep13.073255.3096@u-tokyo.ac.jp> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Sep13.073255.3096@u-tokyo.ac.jp>, gcampbell@u-tokyo.ac.jp (Göran Campbell) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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. -- Tyler Ramírez -- University of Cambridge Computer Laboratory "Hold for relay." From kmacdonald@mit.edu Sun Sep 15 11:51:55 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!mit!kmacdonald From: kmacdonald@mit.edu (Kirsty MacDonald) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Sep15.115155.6729@mit.edu> Date: Sun, 15 Sep 1996 11:51:55 GMT References: <1996Sep13.073255.3096@u-tokyo.ac.jp> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Sep13.073255.3096@u-tokyo.ac.jp>, gcampbell@u-tokyo.ac.jp (Göran Campbell) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Kirsty MacDonald Tape trading list upon request. SASE required for international mail.