From lramirez@utexas.edu Mon May 06 04:15:30 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!utexas!lramirez From: lramirez@utexas.edu (Lucia Ramírez) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996May06.041530.9241@utexas.edu> Date: Mon, 06 May 1996 04:15:30 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. 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. -- Lucia Ramírez Opinions expressed are solely my own and not those of University of Texas at Austin. ------------------------------------------------------------ From tkuznetsov@stanford.edu Mon May 06 05:48:30 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!stanford!tkuznetsov From: tkuznetsov@stanford.edu (Tyler Kuznetsov) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996May06.054830.9390@stanford.edu> Date: Mon, 06 May 1996 05:48:30 GMT References: <1996May06.041530.9241@utexas.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1996May06.041530.9241@utexas.edu>, lramirez@utexas.edu (Lucia Ramírez) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. PGP Public key available via finger or upon request. -- Tyler Kuznetsov | tkuznetsov@stanford.edu PGP Key fingerprint: 90FC 79C7 7A06 C5CD "Keep the channels open." From rpopov@pipeline.com Mon May 06 10:26:30 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!pipeline!rpopov From: rpopov@pipeline.com (Raj Popov) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996May06.102630.7610@pipeline.com> Date: Mon, 06 May 1996 10:26:30 GMT References: <1996May06.041530.9241@utexas.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996May06.041530.9241@utexas.edu>, lramirez@utexas.edu (Lucia Ramírez) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. PGP Public key available via finger or upon request. -- Raj Popov *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From msmirnov@stanford.edu Wed May 08 07:15:30 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!stanford!msmirnov From: msmirnov@stanford.edu (Mikhail Smirnov) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996May08.071530.8635@stanford.edu> Date: Wed, 08 May 1996 07:15:30 GMT References: <1996May06.041530.9241@utexas.edu> <1996May06.102630.7610@pipeline.com> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996May06.102630.7610@pipeline.com>, rpopov@pipeline.com (Raj Popov) 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. > PGP Public key available via finger or upon request. 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Mikhail Smirnov -- Stanford University Computer Systems Lab "5 sigma is a discovery. 7 is a question." From mmartinez@berkeley.edu Thu May 09 21:06:30 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!berkeley!mmartinez From: mmartinez@berkeley.edu (Morag Martínez) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996May09.210630.8103@berkeley.edu> Date: Thu, 09 May 1996 21:06:30 GMT References: <1996May06.041530.9241@utexas.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1996May06.041530.9241@utexas.edu>, lramirez@utexas.edu (Lucia Ramírez) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Morag Martínez SupraFAXModem 28.8 @ 33,600 bps "A soul is not exclusive to biology."