From mvasiliev@u-tokyo.ac.jp Thu Jul 06 14:30:04 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!mvasiliev From: mvasiliev@u-tokyo.ac.jp (Mei Vasiliev) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul06.143004.1044@u-tokyo.ac.jp> Date: Thu, 06 Jul 1995 14:30:04 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Mei Vasiliev "Do not worship the copy." 486DX2/66 (Linux 1.2.13) / System 7.5.1 From mgarcia@tum.de Fri Jul 07 18:31:04 1995 Path: ashpoly!cascade!brgate!saturno!tum!mgarcia From: mgarcia@tum.de (Morag García) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul07.183104.8548@tum.de> Date: Fri, 07 Jul 1995 18:31:04 GMT References: <1995Jul06.143004.1044@u-tokyo.ac.jp> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jul06.143004.1044@u-tokyo.ac.jp>, mvasiliev@u-tokyo.ac.jp (Mei Vasiliev) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Morag García Tape trading list upon request. SASE required for international mail. From fito@u-tokyo.ac.jp Sun Jul 09 21:54:04 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!u-tokyo!fito From: fito@u-tokyo.ac.jp (Freya Ito) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul09.215404.3872@u-tokyo.ac.jp> Date: Sun, 09 Jul 1995 21:54:04 GMT References: <1995Jul06.143004.1044@u-tokyo.ac.jp> <1995Jul07.183104.8548@tum.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Jul07.183104.8548@tum.de>, mgarcia@tum.de (Morag García) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. 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 Ito -- University of Tokyo Department of Information Science "Hold for relay." From nmartinez@kiae.su Mon Jul 10 21:42:04 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kiae!nmartinez From: nmartinez@kiae.su (Nadia Martínez) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul10.214204.6050@kiae.su> Date: Mon, 10 Jul 1995 21:42:04 GMT References: <1995Jul06.143004.1044@u-tokyo.ac.jp> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jul06.143004.1044@u-tokyo.ac.jp>, mvasiliev@u-tokyo.ac.jp (Mei Vasiliev) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- Nadia Martínez Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow. ------------------------------------------------------------