From bpetrov@delphi.com Sun Feb 05 17:43:53 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!delphi!bpetrov From: bpetrov@delphi.com (Bill Petrov) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb05.174353.9229@delphi.com> Date: Sun, 05 Feb 1995 17:43:53 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 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? -- Bill Petrov *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From asilva@berkeley.edu Tue Feb 07 07:00:53 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!berkeley!asilva From: asilva@berkeley.edu (Andrei Silva) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb07.070053.9974@berkeley.edu> Date: Tue, 07 Feb 1995 07:00:53 GMT References: <1995Feb05.174353.9229@delphi.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb05.174353.9229@delphi.com>, bpetrov@delphi.com (Bill Petrov) 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. -- Andrei Silva Hayes Optima 288 @ 14,400 bps "Hold for relay." From kchoi@mindspring.com Tue Feb 07 15:05:53 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!kchoi From: kchoi@mindspring.com (Kirsty Choi) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb07.150553.8071@mindspring.com> Date: Tue, 07 Feb 1995 15:05:53 GMT References: <1995Feb05.174353.9229@delphi.com> <1995Feb07.070053.9974@berkeley.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Feb07.070053.9974@berkeley.edu>, asilva@berkeley.edu (Andrei Silva) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Kirsty Choi | kchoi@mindspring.com PGP Key fingerprint: 1835 4DA6 45E1 DF2F "Keep the channels open." From jlindqvist@pacbell.net Wed Feb 08 03:35:53 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pacbell!jlindqvist From: jlindqvist@pacbell.net (Jens Lindqvist) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb08.033553.6169@pacbell.net> Date: Wed, 08 Feb 1995 03:35:53 GMT References: <1995Feb05.174353.9229@delphi.com> <1995Feb07.070053.9974@berkeley.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Feb07.070053.9974@berkeley.edu>, asilva@berkeley.edu (Andrei Silva) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. 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. PGP Public key available via finger or upon request. -- === Jens Lindqvist === Dept of Electrical Engineering, Pacific Bell Internet Services "The hatch is open. Is anyone listening?"