From mpark@unam.mx Fri Sep 13 04:31:01 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!unam!mpark From: mpark@unam.mx (Min-jun Park) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Sep13.043101.8988@unam.mx> Date: Fri, 13 Sep 1996 04:31:01 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 10 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. 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? -- Min-jun Park Tape trading list upon request. SASE required for international mail. From mlee@uu.net Sat Sep 14 10:32:01 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!mlee From: mlee@uu.net (Mikhail Lee) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Sep14.103201.4123@uu.net> Date: Sat, 14 Sep 1996 10:32:01 GMT References: <1996Sep13.043101.8988@unam.mx> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Sep13.043101.8988@unam.mx>, mpark@unam.mx (Min-jun Park) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz. Top-posters will be placed in my ~/.killfile without notice. -- Mikhail Lee *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From eduarte@cam.ac.uk Sat Sep 14 15:24:01 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!eduarte From: eduarte@cam.ac.uk (Elaine Duarte) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Sep14.152401.7137@cam.ac.uk> Date: Sat, 14 Sep 1996 15:24:01 GMT References: <1996Sep13.043101.8988@unam.mx> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Sep13.043101.8988@unam.mx>, mpark@unam.mx (Min-jun Park) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Elaine Duarte | eduarte@cam.ac.uk PGP Key fingerprint: 166C FA84 C328 58CF "Keep the channels open."