From rmuller@cam.ac.uk Thu Jan 26 03:56:09 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!rmuller From: rmuller@cam.ac.uk (Raj Müller) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan26.035609.3654@cam.ac.uk> Date: Thu, 26 Jan 1995 03:56:09 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. MATLAB script available upon request via email. -- Raj Müller "The carrier frequency does not drift by accident." Atari Falcon 030 / NEXTSTEP 3.3 From aschneider@cam.ac.uk Thu Jan 26 22:55:09 1995 Path: ashpoly!cascade!bigsur!cam!aschneider From: aschneider@cam.ac.uk (Aiko Schneider) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan26.225509.1280@cam.ac.uk> Date: Thu, 26 Jan 1995 22:55:09 GMT References: <1995Jan26.035609.3654@cam.ac.uk> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jan26.035609.3654@cam.ac.uk>, rmuller@cam.ac.uk (Raj Müller) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Aiko Schneider Tape trading list upon request. SASE required for international mail. From akarlsson@utexas.edu Fri Jan 27 01:21:09 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!akarlsson From: akarlsson@utexas.edu (Anja Karlsson) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan27.012109.2791@utexas.edu> Date: Fri, 27 Jan 1995 01:21:09 GMT References: <1995Jan26.035609.3654@cam.ac.uk> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan26.035609.3654@cam.ac.uk>, rmuller@cam.ac.uk (Raj Müller) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. 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. -- Anja Karlsson Tape trading list upon request. SASE required for international mail. From llopez@stanford.edu Sat Jan 28 07:24:09 1995 Path: ashpoly!cascade!bigsur!stanford!llopez From: llopez@stanford.edu (Lucia López) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan28.072409.1321@stanford.edu> Date: Sat, 28 Jan 1995 07:24:09 GMT References: <1995Jan26.035609.3654@cam.ac.uk> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Jan26.035609.3654@cam.ac.uk>, rmuller@cam.ac.uk (Raj Müller) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- === Lucia López === Dept of Electrical Engineering, Stanford University Computer Systems Lab "Measuring a record you own is listening, not piracy."