From gkarlsson@pacbell.net Sat Mar 11 09:52:31 1995 Path: ashpoly!cascade!transat!ukc!fennimore!pacbell!gkarlsson From: gkarlsson@pacbell.net (Göran Karlsson) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar11.095231.8375@pacbell.net> Date: Sat, 11 Mar 1995 09:52:31 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. 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? -- Göran Karlsson | gkarlsson@pacbell.net PGP Key fingerprint: B418 9C00 B119 1BF7 "Keep the channels open." From rdubois@berkeley.edu Mon Mar 13 12:38:31 1995 Path: ashpoly!cascade!transat!ukc!fennimore!berkeley!rdubois From: rdubois@berkeley.edu (Raj Dubois) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar13.123831.9680@berkeley.edu> Date: Mon, 13 Mar 1995 12:38:31 GMT References: <1995Mar11.095231.8375@pacbell.net> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Mar11.095231.8375@pacbell.net>, gkarlsson@pacbell.net (Göran Karlsson) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Raj Dubois -- UC Berkeley Department of EECS "Tape doesn't lie at 02:14. Ears do." From jstewart@netcom.com Mon Mar 13 14:25:31 1995 Path: ashpoly!cascade!transat!ukc!fennimore!netcom!jstewart From: jstewart@netcom.com (Joachim Stewart) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar13.142531.5092@netcom.com> Date: Mon, 13 Mar 1995 14:25:31 GMT References: <1995Mar11.095231.8375@pacbell.net> <1995Mar13.123831.9680@berkeley.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Mar13.123831.9680@berkeley.edu>, rdubois@berkeley.edu (Raj Dubois) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Joachim Stewart "The carrier frequency does not drift by accident." PC-9821Ap2 (NEC) / SunOS 4.1.4 From mnovak@earthlink.net Tue Mar 14 03:28:31 1995 Path: ashpoly!cascade!mxgate!coyoacan!earthlink!mnovak From: mnovak@earthlink.net (Min-jun Novak) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar14.032831.7094@earthlink.net> Date: Tue, 14 Mar 1995 03:28:31 GMT References: <1995Mar11.095231.8375@pacbell.net> <1995Mar13.123831.9680@berkeley.edu> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Mar13.123831.9680@berkeley.edu>, rdubois@berkeley.edu (Raj Dubois) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Min-jun Novak Opinions expressed are solely my own and not those of EarthLink Network. ------------------------------------------------------------