From loliveira@pacbell.net Fri Jan 13 18:40:11 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pacbell!loliveira From: loliveira@pacbell.net (Liam Oliveira) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan13.184011.4166@pacbell.net> Date: Fri, 13 Jan 1995 18:40:11 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Liam Oliveira Practical Peripherals 14.4 @ 14,400 bps "Extraordinary claims require extraordinary spectra." From slarsson@earthlink.net Sat Jan 14 19:19:11 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!earthlink!slarsson From: slarsson@earthlink.net (Steve Larsson) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan14.191911.5830@earthlink.net> Date: Sat, 14 Jan 1995 19:19:11 GMT References: <1995Jan13.184011.4166@pacbell.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jan13.184011.4166@pacbell.net>, loliveira@pacbell.net (Liam Oliveira) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! -- Steve Larsson *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0