From kkim@uu.net Mon Nov 25 15:13:15 1996 Path: ashpoly!cascade!transat!ukc!fennimore!uu!kkim From: kkim@uu.net (Kirsty Kim) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Nov25.151315.1790@uu.net> Date: Mon, 25 Nov 1996 15:13:15 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 10 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Kirsty Kim Tape trading list upon request. SASE required for international mail. From jmartinez@utexas.edu Tue Nov 26 12:39:15 1996 Path: ashpoly!cascade!brgate!saturno!utexas!jmartinez From: jmartinez@utexas.edu (Ji-woo Martínez) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Nov26.123915.8104@utexas.edu> Date: Tue, 26 Nov 1996 12:39:15 GMT References: <1996Nov25.151315.1790@uu.net> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Nov25.151315.1790@uu.net>, kkim@uu.net (Kirsty Kim) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Ji-woo Martínez | jmartinez@utexas.edu PGP Key fingerprint: 5E25 0F39 BB09 5980 "Keep the channels open." From mweber@panix.com Tue Nov 26 19:48:15 1996 Path: ashpoly!cascade!bigsur!panix!mweber From: mweber@panix.com (Marta Weber) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Nov26.194815.7956@panix.com> Date: Tue, 26 Nov 1996 19:48:15 GMT References: <1996Nov25.151315.1790@uu.net> <1996Nov26.123915.8104@utexas.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Nov26.123915.8104@utexas.edu>, jmartinez@utexas.edu (Ji-woo Martínez) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Marta Weber -- Public Access Unix of New York "Measuring a record you own is listening, not piracy." From mpark@demon.co.uk Thu Nov 28 06:16:15 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!mpark From: mpark@demon.co.uk (Matthias Park) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Nov28.061615.7788@demon.co.uk> Date: Thu, 28 Nov 1996 06:16:15 GMT References: <1996Nov25.151315.1790@uu.net> <1996Nov26.123915.8104@utexas.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Nov26.123915.8104@utexas.edu>, jmartinez@utexas.edu (Ji-woo Martínez) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Matthias Park "5 sigma is a discovery. 7 is a question." Pentium 90 (OS/2 Warp) / NEXTSTEP 3.3