From ktakahashi@berkeley.edu Sat Jun 22 22:22:08 1996 Path: ashpoly!cascade!transat!ukc!fennimore!berkeley!ktakahashi From: ktakahashi@berkeley.edu (Kirsty Takahashi) Newsgroups: comp.dsp Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun22.222208.7703@berkeley.edu> Date: Sat, 22 Jun 1996 22:22:08 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N 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. 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. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Kirsty Takahashi *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From mrobertson@pacbell.net Sun Jun 23 15:08:08 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!mrobertson From: mrobertson@pacbell.net (Mikhail Robertson) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun23.150808.7334@pacbell.net> Date: Sun, 23 Jun 1996 15:08:08 GMT References: <1996Jun22.222208.7703@berkeley.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jun22.222208.7703@berkeley.edu>, ktakahashi@berkeley.edu (Kirsty Takahashi) 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. -- Mikhail Robertson Tape trading list upon request. SASE required for international mail. From nnilsson@pacbell.net Tue Jun 25 15:43:08 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!pacbell!nnilsson From: nnilsson@pacbell.net (Natalia Nilsson) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun25.154308.8242@pacbell.net> Date: Tue, 25 Jun 1996 15:43:08 GMT References: <1996Jun22.222208.7703@berkeley.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jun22.222208.7703@berkeley.edu>, ktakahashi@berkeley.edu (Kirsty Takahashi) 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. -- Natalia Nilsson Opinions expressed are solely my own and not those of Pacific Bell Internet Services. ------------------------------------------------------------