From tramirez@berkeley.edu Thu Jul 27 00:31:44 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!tramirez From: tramirez@berkeley.edu (Tomas Ramírez) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul27.003144.3610@berkeley.edu> Date: Thu, 27 Jul 1995 00:31:44 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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? -- Tomas Ramírez *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From tnovak@stanford.edu Fri Jul 28 08:25:44 1995 Path: ashpoly!cascade!transat!ukc!fennimore!stanford!tnovak From: tnovak@stanford.edu (Tomas Novak) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul28.082544.3065@stanford.edu> Date: Fri, 28 Jul 1995 08:25:44 GMT References: <1995Jul27.003144.3610@berkeley.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul27.003144.3610@berkeley.edu>, tramirez@berkeley.edu (Tomas Ramírez) 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. -- Tomas Novak Opinions expressed are solely my own and not those of Stanford University Computer Systems Lab. ------------------------------------------------------------ From acampbell@uni-hamburg.de Fri Jul 28 21:34:44 1995 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!acampbell From: acampbell@uni-hamburg.de (Astrid Campbell) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul28.213444.7071@uni-hamburg.de> Date: Fri, 28 Jul 1995 21:34:44 GMT References: <1995Jul27.003144.3610@berkeley.edu> <1995Jul28.082544.3065@stanford.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jul28.082544.3065@stanford.edu>, tnovak@stanford.edu (Tomas Novak) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Astrid Campbell Hayes Optima 288 @ 19,200 bps "When every node is whole, the channel opens."