From holiveira@tum.de Mon Nov 07 19:11:37 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!tum!holiveira From: holiveira@tum.de (Hugo Oliveira) Newsgroups: comp.dsp Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Nov07.191137.5580@tum.de> Date: Mon, 07 Nov 1994 19:11:37 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. 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? -- Hugo Oliveira *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From nrobertson@hanse.de Tue Nov 08 02:40:37 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!nrobertson From: nrobertson@hanse.de (Nadia Robertson) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Nov08.024037.2687@hanse.de> Date: Tue, 08 Nov 1994 02:40:37 GMT References: <1994Nov07.191137.5580@tum.de> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1994Nov07.191137.5580@tum.de>, holiveira@tum.de (Hugo Oliveira) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Nadia Robertson US Robotics Courier V.34 @ 9600 Telebit bps "When every node is whole, the channel opens." From akowalski@tum.de Wed Nov 09 20:16:37 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!tum!akowalski From: akowalski@tum.de (Anton Kowalski) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Nov09.201637.8178@tum.de> Date: Wed, 09 Nov 1994 20:16:37 GMT References: <1994Nov07.191137.5580@tum.de> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Nov07.191137.5580@tum.de>, holiveira@tum.de (Hugo Oliveira) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > 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. -- Anton Kowalski SupraFAXModem 28.8 @ 14,400 bps "Measuring a record you own is listening, not piracy."