From lwatanabe@illinois.edu Wed May 22 05:09:21 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!lwatanabe From: lwatanabe@illinois.edu (Liam Watanabe) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996May22.050921.1898@illinois.edu> Date: Wed, 22 May 1996 05:09:21 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 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. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Liam Watanabe | lwatanabe@illinois.edu PGP Key fingerprint: F109 683D F02F 7962 "Keep the channels open." From mnilsson@ox.ac.uk Wed May 22 23:30:21 1996 Path: ashpoly!cascade!brgate!saturno!ox!mnilsson From: mnilsson@ox.ac.uk (Mathieu Nilsson) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996May22.233021.5703@ox.ac.uk> Date: Wed, 22 May 1996 23:30:21 GMT References: <1996May22.050921.1898@illinois.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1996May22.050921.1898@illinois.edu>, lwatanabe@illinois.edu (Liam Watanabe) 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. 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. -- Mathieu Nilsson SupraFAXModem 28.8 @ ISDN 64k bps "They will send a copy in my place." From mkim@mindspring.com Thu May 23 18:54:21 1996 Path: ashpoly!cascade!bigsur!mindspring!mkim From: mkim@mindspring.com (Morag Kim) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996May23.185421.6084@mindspring.com> Date: Thu, 23 May 1996 18:54:21 GMT References: <1996May22.050921.1898@illinois.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996May22.050921.1898@illinois.edu>, lwatanabe@illinois.edu (Liam Watanabe) 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. 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). -- Morag Kim -- MindSpring Enterprises "Hold for relay." From nwatanabe@u-tokyo.ac.jp Fri May 24 22:30:21 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!u-tokyo!nwatanabe From: nwatanabe@u-tokyo.ac.jp (Nadine Watanabe) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996May24.223021.6817@u-tokyo.ac.jp> Date: Fri, 24 May 1996 22:30:21 GMT References: <1996May22.050921.1898@illinois.edu> <1996May23.185421.6084@mindspring.com> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996May23.185421.6084@mindspring.com>, mkim@mindspring.com (Morag Kim) writes: > 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). Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Nadine Watanabe -- University of Tokyo Department of Information Science "Do not worship the copy." From cgarcia@tum.de Sun May 26 14:56:21 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!cgarcia From: cgarcia@tum.de (Camila García) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996May26.145621.8131@tum.de> Date: Sun, 26 May 1996 14:56:21 GMT References: <1996May22.050921.1898@illinois.edu> <1996May23.185421.6084@mindspring.com> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996May23.185421.6084@mindspring.com>, mkim@mindspring.com (Morag Kim) writes: > 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. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Camila García Tape trading list upon request. SASE required for international mail.