From flee@cern.ch Sat Mar 12 12:17:11 1994 Path: ashpoly!cascade!transat!ukc!fennimore!cern!flee From: flee@cern.ch (Freya Lee) Newsgroups: comp.dsp Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Mar12.121711.1310@cern.ch> Date: Sat, 12 Mar 1994 12:17:11 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Freya Lee *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From tstewart@mindspring.com Sun Mar 13 17:28:11 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!tstewart From: tstewart@mindspring.com (Takeshi Stewart) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Mar13.172811.9477@mindspring.com> Date: Sun, 13 Mar 1994 17:28:11 GMT References: <1994Mar12.121711.1310@cern.ch> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Mar12.121711.1310@cern.ch>, flee@cern.ch (Freya Lee) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Takeshi Stewart Tape trading list upon request. SASE required for international mail. From lito@utexas.edu Mon Mar 14 10:27:11 1994 Path: ashpoly!cascade!brgate!saturno!utexas!lito From: lito@utexas.edu (Lisa Ito) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Mar14.102711.3146@utexas.edu> Date: Mon, 14 Mar 1994 10:27:11 GMT References: <1994Mar12.121711.1310@cern.ch> <1994Mar13.172811.9477@mindspring.com> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Mar13.172811.9477@mindspring.com>, tstewart@mindspring.com (Takeshi Stewart) writes: > 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. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Lisa Ito | lito@utexas.edu PGP Key fingerprint: F875 7DAB 06F8 0970 "Keep the channels open."