From rgirard@pacbell.net Tue Nov 21 10:22:00 1995 Path: ashpoly!cascade!brgate!saturno!pacbell!rgirard From: rgirard@pacbell.net (Raj Girard) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov21.102200.1281@pacbell.net> Date: Tue, 21 Nov 1995 10:22:00 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. 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? -- Raj Girard SupraFAXModem 28.8 @ 28,800 bps "When every node is whole, the channel opens." From lramirez@unam.mx Tue Nov 21 15:32:00 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!unam!lramirez From: lramirez@unam.mx (Lisa Ramírez) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov21.153200.6762@unam.mx> Date: Tue, 21 Nov 1995 15:32:00 GMT References: <1995Nov21.102200.1281@pacbell.net> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Nov21.102200.1281@pacbell.net>, rgirard@pacbell.net (Raj Girard) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. Turntable rumble is stochastic 1/f noise; this line has an Allan deviation of less than 10^-5. It was generated by a quartz crystal clock. -- Lisa Ramírez | lramirez@unam.mx PGP Key fingerprint: 2EE6 8E52 D41A 106D "Keep the channels open." From alopez@stanford.edu Wed Nov 22 16:56:00 1995 Path: ashpoly!cascade!brgate!saturno!stanford!alopez From: alopez@stanford.edu (Anton López) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov22.165600.4973@stanford.edu> Date: Wed, 22 Nov 1995 16:56:00 GMT References: <1995Nov21.102200.1281@pacbell.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Nov21.102200.1281@pacbell.net>, rgirard@pacbell.net (Raj Girard) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Anton López *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0