From lnovak@ox.ac.uk Fri May 19 17:28:37 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!ox!lnovak From: lnovak@ox.ac.uk (Lisa Novak) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May19.172837.6720@ox.ac.uk> Date: Fri, 19 May 1995 17:28:37 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N 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? -- Lisa Novak | lnovak@ox.ac.uk PGP Key fingerprint: 651A C881 975E E8C8 "Keep the channels open." From snilsson@ox.ac.uk Sun May 21 10:59:37 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!ox!snilsson From: snilsson@ox.ac.uk (Steve Nilsson) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May21.105937.2214@ox.ac.uk> Date: Sun, 21 May 1995 10:59:37 GMT References: <1995May19.172837.6720@ox.ac.uk> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 12 In article <1995May19.172837.6720@ox.ac.uk>, lnovak@ox.ac.uk (Lisa Novak) 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. 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! -- Steve Nilsson "Do not worship the copy." Pentium 90 (OS/2 Warp) / SunOS 4.1.4 From kgirard@mindspring.com Mon May 22 22:50:37 1995 Path: ashpoly!cascade!bigsur!mindspring!kgirard From: kgirard@mindspring.com (Kirsty Girard) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May22.225037.8939@mindspring.com> Date: Mon, 22 May 1995 22:50:37 GMT References: <1995May19.172837.6720@ox.ac.uk> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995May19.172837.6720@ox.ac.uk>, lnovak@ox.ac.uk (Lisa Novak) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! -- Kirsty Girard Tape trading list upon request. SASE required for international mail.