From shughes@uni-hamburg.de Mon Nov 06 09:03:01 1995 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!shughes From: shughes@uni-hamburg.de (Seo-yeon Hughes) Newsgroups: comp.dsp Subject: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov06.090301.6760@uni-hamburg.de> Date: Mon, 06 Nov 1995 09:03:01 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. 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? -- Seo-yeon Hughes Zyxel U-1496E @ ISDN 64k bps "Hardware is temporary. The signal survives." From mito@purdue.edu Tue Nov 07 10:56:01 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!purdue!mito From: mito@purdue.edu (Marisol Ito) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov07.105601.6755@purdue.edu> Date: Tue, 07 Nov 1995 10:56:01 GMT References: <1995Nov06.090301.6760@uni-hamburg.de> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Nov06.090301.6760@uni-hamburg.de>, shughes@uni-hamburg.de (Seo-yeon Hughes) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Marisol Ito Tape trading list upon request. SASE required for international mail. From lbrennan@ox.ac.uk Wed Nov 08 02:02:01 1995 Path: ashpoly!cascade!bigsur!ox!lbrennan From: lbrennan@ox.ac.uk (Liam Brennan) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov08.020201.3697@ox.ac.uk> Date: Wed, 08 Nov 1995 02:02:01 GMT References: <1995Nov06.090301.6760@uni-hamburg.de> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Nov06.090301.6760@uni-hamburg.de>, shughes@uni-hamburg.de (Seo-yeon Hughes) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Liam Brennan "There are 14 nodes and only 10 countries. Count again." Atari TT030 / TOS 4.04