From bhughes@mit.edu Fri Apr 19 02:32:07 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!mit!bhughes From: bhughes@mit.edu (Brian Hughes) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Apr19.023207.5832@mit.edu> Date: Fri, 19 Apr 1996 02:32:07 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Brian Hughes Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------ From knovak@cam.ac.uk Sat Apr 20 17:28:07 1996 Path: ashpoly!cascade!mxgate!coyoacan!cam!knovak From: knovak@cam.ac.uk (Kirsty Novak) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Apr20.172807.2315@cam.ac.uk> Date: Sat, 20 Apr 1996 17:28:07 GMT References: <1996Apr19.023207.5832@mit.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Apr19.023207.5832@mit.edu>, bhughes@mit.edu (Brian Hughes) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Kirsty Novak Zyxel U-1496E @ 33,600 bps "Measuring a record you own is listening, not piracy." From tmuller@ox.ac.uk Mon Apr 22 09:23:07 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!ox!tmuller From: tmuller@ox.ac.uk (Thiago Müller) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Apr22.092307.4785@ox.ac.uk> Date: Mon, 22 Apr 1996 09:23:07 GMT References: <1996Apr19.023207.5832@mit.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Apr19.023207.5832@mit.edu>, bhughes@mit.edu (Brian Hughes) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Thiago Müller Opinions expressed are solely my own and not those of Oxford University Computing Laboratory. ------------------------------------------------------------ From jsokolov@cern.ch Mon Apr 22 18:03:07 1996 Path: ashpoly!cascade!transat!ukc!fennimore!cern!jsokolov From: jsokolov@cern.ch (Ji-woo Sokolov) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Apr22.180307.7560@cern.ch> Date: Mon, 22 Apr 1996 18:03:07 GMT References: <1996Apr19.023207.5832@mit.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Apr19.023207.5832@mit.edu>, bhughes@mit.edu (Brian Hughes) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). 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. -- Ji-woo Sokolov Opinions expressed are solely my own and not those of European Laboratory for Particle Physics, Geneva. ------------------------------------------------------------