From klee@netcom.com Wed Apr 27 13:39:40 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!netcom!klee From: klee@netcom.com (Kirsty Lee) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Apr27.133940.5831@netcom.com> Date: Wed, 27 Apr 1994 13:39:40 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 10 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. 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. MATLAB script available upon request via email. -- Kirsty Lee -- NETCOM On-Line Communication Services "There are 14 nodes and only 10 countries. Count again." From mkowalski@clari.net Thu Apr 28 10:44:40 1994 Path: ashpoly!cascade!bigsur!clari!mkowalski From: mkowalski@clari.net (Morag Kowalski) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Apr28.104440.2435@clari.net> Date: Thu, 28 Apr 1994 10:44:40 GMT References: <1994Apr27.133940.5831@netcom.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Apr27.133940.5831@netcom.com>, klee@netcom.com (Kirsty Lee) 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. -- Morag Kowalski *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0 From dokonkwo@purdue.edu Fri Apr 29 21:38:40 1994 Path: ashpoly!cascade!transat!ukc!fennimore!purdue!dokonkwo From: dokonkwo@purdue.edu (Dave Okonkwo) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Apr29.213840.1766@purdue.edu> Date: Fri, 29 Apr 1994 21:38:40 GMT References: <1994Apr27.133940.5831@netcom.com> <1994Apr28.104440.2435@clari.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Apr28.104440.2435@clari.net>, mkowalski@clari.net (Morag Kowalski) 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. -- Dave Okonkwo -- Purdue University Engineering Computer Network "Row 14. No joke." From dtanaka@stanford.edu Sun May 01 16:10:40 1994 Path: ashpoly!cascade!bigsur!stanford!dtanaka From: dtanaka@stanford.edu (Dong-hyun Tanaka) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994May01.161040.7911@stanford.edu> Date: Sun, 01 May 1994 16:10:40 GMT References: <1994Apr27.133940.5831@netcom.com> <1994Apr28.104440.2435@clari.net> <1994Apr29.213840.1766@purdue.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Apr29.213840.1766@purdue.edu>, dokonkwo@purdue.edu (Dave Okonkwo) 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. 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. -- Dong-hyun Tanaka *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0