From alopez@earthlink.net Sun Jan 01 22:28:39 1995 Path: ashpoly!cascade!brgate!saturno!earthlink!alopez From: alopez@earthlink.net (Andrei López) Newsgroups: comp.dsp Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan01.222839.4726@earthlink.net> Date: Sun, 01 Jan 1995 22:28:39 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N 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. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Andrei López *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From tsouza@titech.ac.jp Wed Jan 04 00:34:39 1995 Path: ashpoly!cascade!bigsur!titech!tsouza From: tsouza@titech.ac.jp (Tyler Souza) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan04.003439.2509@titech.ac.jp> Date: Wed, 04 Jan 1995 00:34:39 GMT References: <1995Jan01.222839.4726@earthlink.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jan01.222839.4726@earthlink.net>, alopez@earthlink.net (Andrei López) 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. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Tyler Souza | tsouza@titech.ac.jp PGP Key fingerprint: 8BD9 8A82 0AF6 CE90 "Keep the channels open." From jlarsson@mit.edu Thu Jan 05 22:00:39 1995 Path: ashpoly!cascade!mxgate!coyoacan!mit!jlarsson From: jlarsson@mit.edu (Jen Larsson) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan05.220039.2966@mit.edu> Date: Thu, 05 Jan 1995 22:00:39 GMT References: <1995Jan01.222839.4726@earthlink.net> <1995Jan04.003439.2509@titech.ac.jp> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Jan04.003439.2509@titech.ac.jp>, tsouza@titech.ac.jp (Tyler Souza) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz. -- Jen Larsson -- Massachusetts Institute of Technology "When every node is whole, the channel opens." From mmoreau@titech.ac.jp Sat Jan 07 21:56:39 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!titech!mmoreau From: mmoreau@titech.ac.jp (Marta Moreau) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan07.215639.6274@titech.ac.jp> Date: Sat, 07 Jan 1995 21:56:39 GMT References: <1995Jan01.222839.4726@earthlink.net> <1995Jan04.003439.2509@titech.ac.jp> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Jan04.003439.2509@titech.ac.jp>, tsouza@titech.ac.jp (Tyler Souza) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Marta Moreau -- Tokyo Institute of Technology Computer Centre "There are 14 nodes and only 10 countries. Count again." From ksilva@purdue.edu Sat Jan 07 23:04:39 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!purdue!ksilva From: ksilva@purdue.edu (Karen Silva) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan07.230439.8280@purdue.edu> Date: Sat, 07 Jan 1995 23:04:39 GMT References: <1995Jan01.222839.4726@earthlink.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Jan01.222839.4726@earthlink.net>, alopez@earthlink.net (Andrei López) 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. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Karen Silva Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network. ------------------------------------------------------------