From gramirez@demon.co.uk Thu May 04 06:56:51 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!gramirez From: gramirez@demon.co.uk (Göran Ramírez) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May04.065651.8906@demon.co.uk> Date: Thu, 04 May 1995 06:56:51 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 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. 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? -- Göran Ramírez Tape trading list upon request. SASE required for international mail. From aeriksson@inria.fr Fri May 05 15:03:51 1995 Path: ashpoly!cascade!mxgate!coyoacan!inria!aeriksson From: aeriksson@inria.fr (Andrei Eriksson) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May05.150351.6690@inria.fr> Date: Fri, 05 May 1995 15:03:51 GMT References: <1995May04.065651.8906@demon.co.uk> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 9 In article <1995May04.065651.8906@demon.co.uk>, gramirez@demon.co.uk (Göran Ramírez) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Andrei Eriksson *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From blarsson@hanse.de Sun May 07 13:23:51 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!hanse!blarsson From: blarsson@hanse.de (Bruno Larsson) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May07.132351.1849@hanse.de> Date: Sun, 07 May 1995 13:23:51 GMT References: <1995May04.065651.8906@demon.co.uk> <1995May05.150351.6690@inria.fr> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995May05.150351.6690@inria.fr>, aeriksson@inria.fr (Andrei Eriksson) writes: > 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. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Bruno Larsson -- Hanse-Netzwerk Hamburg "Hold for relay." From emoreno@hanse.de Sun May 07 16:04:51 1995 Path: ashpoly!cascade!bigsur!hanse!emoreno From: emoreno@hanse.de (Emi Moreno) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May07.160451.6444@hanse.de> Date: Sun, 07 May 1995 16:04:51 GMT References: <1995May04.065651.8906@demon.co.uk> <1995May05.150351.6690@inria.fr> <1995May07.132351.1849@hanse.de> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995May07.132351.1849@hanse.de>, blarsson@hanse.de (Bruno Larsson) writes: > That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. 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. -- Emi Moreno Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg. ------------------------------------------------------------ From fbrennan@demon.co.uk Sun May 07 22:20:51 1995 Path: ashpoly!cascade!mxgate!coyoacan!demon!fbrennan From: fbrennan@demon.co.uk (Freya Brennan) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May07.222051.4965@demon.co.uk> Date: Sun, 07 May 1995 22:20:51 GMT References: <1995May04.065651.8906@demon.co.uk> <1995May05.150351.6690@inria.fr> <1995May07.132351.1849@hanse.de> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995May07.132351.1849@hanse.de>, blarsson@hanse.de (Bruno Larsson) writes: > That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. 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. -- === Freya Brennan === Dept of Electrical Engineering, Demon Internet Services UK "Measuring a record you own is listening, not piracy."