From rsanchez@kiae.su Sun Apr 10 02:39:44 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!rsanchez From: rsanchez@kiae.su (Rodrigo Sánchez) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr10.023944.9652@kiae.su> Date: Sun, 10 Apr 1994 02:39:44 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Rodrigo Sánchez Zyxel U-1496E @ 9600 Telebit bps "Tape doesn't lie at 02:14. Ears do." From asokolov@demon.co.uk Tue Apr 12 01:51:44 1994 Path: ashpoly!cascade!mxgate!coyoacan!demon!asokolov From: asokolov@demon.co.uk (Anja Sokolov) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr12.015144.8849@demon.co.uk> Date: Tue, 12 Apr 1994 01:51:44 GMT References: <1994Apr10.023944.9652@kiae.su> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Apr10.023944.9652@kiae.su>, rsanchez@kiae.su (Rodrigo Sánchez) 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. PGP Public key available via finger or upon request. -- Anja Sokolov *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From atakahashi@unam.mx Thu Apr 14 04:18:44 1994 Path: ashpoly!cascade!bigsur!unam!atakahashi From: atakahashi@unam.mx (Astrid Takahashi) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr14.041844.1531@unam.mx> Date: Thu, 14 Apr 1994 04:18:44 GMT References: <1994Apr10.023944.9652@kiae.su> <1994Apr12.015144.8849@demon.co.uk> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Apr12.015144.8849@demon.co.uk>, asokolov@demon.co.uk (Anja Sokolov) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. 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. -- Astrid Takahashi *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From nsantos@panix.com Thu Apr 14 21:51:44 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!panix!nsantos From: nsantos@panix.com (Nadine Santos) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr14.215144.9671@panix.com> Date: Thu, 14 Apr 1994 21:51:44 GMT References: <1994Apr10.023944.9652@kiae.su> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Apr10.023944.9652@kiae.su>, rsanchez@kiae.su (Rodrigo Sánchez) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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. -- Nadine Santos Opinions expressed are solely my own and not those of Public Access Unix of New York. ------------------------------------------------------------