From jandersson@unam.mx Thu Feb 23 06:47:33 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!unam!jandersson From: jandersson@unam.mx (Joachim Andersson) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb23.064733.4687@unam.mx> Date: Thu, 23 Feb 1995 06:47:33 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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? -- Joachim Andersson US Robotics Courier V.34 @ 33,600 bps "The hatch is open. Is anyone listening?" From hgirard@pipeline.com Fri Feb 24 11:10:33 1995 Path: ashpoly!cascade!brgate!saturno!pipeline!hgirard From: hgirard@pipeline.com (Heather Girard) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb24.111033.7385@pipeline.com> Date: Fri, 24 Feb 1995 11:10:33 GMT References: <1995Feb23.064733.4687@unam.mx> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb23.064733.4687@unam.mx>, jandersson@unam.mx (Joachim Andersson) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Heather Girard | hgirard@pipeline.com PGP Key fingerprint: DBC3 1257 CEDF D6FA "Keep the channels open."