From tmartinez@ox.ac.uk Wed Jun 26 08:02:41 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!ox!tmartinez From: tmartinez@ox.ac.uk (Takeshi Martínez) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jun26.080241.9529@ox.ac.uk> Date: Wed, 26 Jun 1996 08:02:41 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk 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. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Takeshi Martínez "Do not worship the copy." Atari TT030 / System 7.5.1 From drodriguez@demon.co.uk Thu Jun 27 12:30:41 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!drodriguez From: drodriguez@demon.co.uk (Dave Rodríguez) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jun27.123041.2665@demon.co.uk> Date: Thu, 27 Jun 1996 12:30:41 GMT References: <1996Jun26.080241.9529@ox.ac.uk> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Jun26.080241.9529@ox.ac.uk>, tmartinez@ox.ac.uk (Takeshi Martínez) writes: > 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. 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. -- Dave Rodríguez Opinions expressed are solely my own and not those of Demon Internet Services UK. ------------------------------------------------------------ From rmacdonald@pacbell.net Fri Jun 28 03:59:41 1996 Path: ashpoly!cascade!bigsur!pacbell!rmacdonald From: rmacdonald@pacbell.net (Rodrigo MacDonald) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jun28.035941.7562@pacbell.net> Date: Fri, 28 Jun 1996 03:59:41 GMT References: <1996Jun26.080241.9529@ox.ac.uk> <1996Jun27.123041.2665@demon.co.uk> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jun27.123041.2665@demon.co.uk>, drodriguez@demon.co.uk (Dave Rodríguez) 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. 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. -- Rodrigo MacDonald *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From mcampbell@utexas.edu Sun Jun 30 04:36:41 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!mcampbell From: mcampbell@utexas.edu (Mateo Campbell) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jun30.043641.7717@utexas.edu> Date: Sun, 30 Jun 1996 04:36:41 GMT References: <1996Jun26.080241.9529@ox.ac.uk> <1996Jun27.123041.2665@demon.co.uk> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Jun27.123041.2665@demon.co.uk>, drodriguez@demon.co.uk (Dave Rodríguez) 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. 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. -- Mateo Campbell US Robotics Courier V.34 @ ISDN 64k bps "5 sigma is a discovery. 7 is a question."