From gandersson@netcom.com Fri Apr 15 07:25:29 1994 Path: ashpoly!cascade!transat!ukc!fennimore!netcom!gandersson From: gandersson@netcom.com (Graham Andersson) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr15.072529.4146@netcom.com> Date: Fri, 15 Apr 1994 07:25:29 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. 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. -- Graham Andersson *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From llaurent@titech.ac.jp Fri Apr 15 20:27:29 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!llaurent From: llaurent@titech.ac.jp (Lucia Laurent) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr15.202729.2359@titech.ac.jp> Date: Fri, 15 Apr 1994 20:27:29 GMT References: <1994Apr15.072529.4146@netcom.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Apr15.072529.4146@netcom.com>, gandersson@netcom.com (Graham Andersson) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- === Lucia Laurent === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "In theory there is no difference between theory and practice." From yandersson@panix.com Sat Apr 16 16:05:29 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!yandersson From: yandersson@panix.com (Yuki Andersson) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr16.160529.8587@panix.com> Date: Sat, 16 Apr 1994 16:05:29 GMT References: <1994Apr15.072529.4146@netcom.com> <1994Apr15.202729.2359@titech.ac.jp> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Apr15.202729.2359@titech.ac.jp>, llaurent@titech.ac.jp (Lucia Laurent) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. 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. -- === Yuki Andersson === Dept of Electrical Engineering, Public Access Unix of New York "Extraordinary claims require extraordinary spectra." From sbrennan@clari.net Mon Apr 18 17:15:29 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!clari!sbrennan From: sbrennan@clari.net (Sergei Brennan) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr18.171529.2951@clari.net> Date: Mon, 18 Apr 1994 17:15:29 GMT References: <1994Apr15.072529.4146@netcom.com> <1994Apr15.202729.2359@titech.ac.jp> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Apr15.202729.2359@titech.ac.jp>, llaurent@titech.ac.jp (Lucia Laurent) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Sergei Brennan Practical Peripherals 14.4 @ 33,600 bps "Extraordinary claims require extraordinary spectra."