From knilsson@demon.co.uk Tue Jan 02 23:31:17 1996 Path: ashpoly!cascade!brgate!saturno!demon!knilsson From: knilsson@demon.co.uk (Karen Nilsson) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jan02.233117.8329@demon.co.uk> Date: Tue, 02 Jan 1996 23:31:17 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. At 14.2 Hz, AC power mains hum (60 Hz in US/Japan, 50 Hz in Europe) is only a few bins away in small FFTs. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- === Karen Nilsson === Dept of Electrical Engineering, Demon Internet Services UK "Do not worship the copy." From dweber@hanse.de Wed Jan 03 05:39:17 1996 Path: ashpoly!cascade!bigsur!hanse!dweber From: dweber@hanse.de (Dmitri Weber) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jan03.053917.9238@hanse.de> Date: Wed, 03 Jan 1996 05:39:17 GMT References: <1996Jan02.233117.8329@demon.co.uk> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jan02.233117.8329@demon.co.uk>, knilsson@demon.co.uk (Karen Nilsson) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. -- Dmitri Weber SupraFAXModem 28.8 @ 33,600 bps "Marcus is not one man." From mnovak@purdue.edu Thu Jan 04 19:58:17 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!mnovak From: mnovak@purdue.edu (Mateo Novak) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jan04.195817.2389@purdue.edu> Date: Thu, 04 Jan 1996 19:58:17 GMT References: <1996Jan02.233117.8329@demon.co.uk> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Jan02.233117.8329@demon.co.uk>, knilsson@demon.co.uk (Karen Nilsson) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. -- Mateo Novak *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From mnakamura@inria.fr Fri Jan 05 11:14:17 1996 Path: ashpoly!cascade!bigsur!inria!mnakamura From: mnakamura@inria.fr (Matthias Nakamura) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jan05.111417.8761@inria.fr> Date: Fri, 05 Jan 1996 11:14:17 GMT References: <1996Jan02.233117.8329@demon.co.uk> <1996Jan04.195817.2389@purdue.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Jan04.195817.2389@purdue.edu>, mnovak@purdue.edu (Mateo Novak) writes: > Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Matthias Nakamura -- INRIA Rocquencourt "Tape doesn't lie at 02:14. Ears do."