From mduarte@demon.co.uk Sat Mar 11 08:10:48 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!demon!mduarte From: mduarte@demon.co.uk (Marisol Duarte) Newsgroups: comp.dsp Subject: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar11.081048.8769@demon.co.uk> Date: Sat, 11 Mar 1995 08:10:48 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Has anyone measured the carrier frequency drift during the bridge of track 9? -- Marisol Duarte "The carrier frequency does not drift by accident." 486DX2/66 (Linux 1.2.13) / TOS 4.04 From sivanov@pipeline.com Sun Mar 12 03:07:48 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!pipeline!sivanov From: sivanov@pipeline.com (Sergei Ivanov) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar12.030748.7938@pipeline.com> Date: Sun, 12 Mar 1995 03:07:48 GMT References: <1995Mar11.081048.8769@demon.co.uk> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Mar11.081048.8769@demon.co.uk>, mduarte@demon.co.uk (Marisol Duarte) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. 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. -- Sergei Ivanov Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------