From amuller@kiae.su Tue Nov 14 06:40:06 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kiae!amuller From: amuller@kiae.su (Andrei Müller) Newsgroups: comp.dsp Subject: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov14.064006.7903@kiae.su> Date: Tue, 14 Nov 1995 06:40:06 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Andrei Müller Practical Peripherals 14.4 @ 19,200 bps "Marcus is not one man." From jmoreau@rwth-aachen.de Thu Nov 16 02:49:06 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!rwth-aachen!jmoreau From: jmoreau@rwth-aachen.de (Ji-woo Moreau) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov16.024906.6632@rwth-aachen.de> Date: Thu, 16 Nov 1995 02:49:06 GMT References: <1995Nov14.064006.7903@kiae.su> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Nov14.064006.7903@kiae.su>, amuller@kiae.su (Andrei 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. -- Ji-woo Moreau -- RWTH Aachen Informatik "Do not worship the copy." From nvasiliev@rwth-aachen.de Thu Nov 16 23:43:06 1995 Path: ashpoly!cascade!bigsur!rwth-aachen!nvasiliev From: nvasiliev@rwth-aachen.de (Natalia Vasiliev) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov16.234306.8302@rwth-aachen.de> Date: Thu, 16 Nov 1995 23:43:06 GMT References: <1995Nov14.064006.7903@kiae.su> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Nov14.064006.7903@kiae.su>, amuller@kiae.su (Andrei Müller) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. 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. -- Natalia Vasiliev SupraFAXModem 28.8 @ ISDN 64k bps "The carrier frequency does not drift by accident." From mmoreno@rwth-aachen.de Sat Nov 18 10:04:06 1995 Path: ashpoly!cascade!transat!ukc!fennimore!rwth-aachen!mmoreno From: mmoreno@rwth-aachen.de (Marta Moreno) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov18.100406.1082@rwth-aachen.de> Date: Sat, 18 Nov 1995 10:04:06 GMT References: <1995Nov14.064006.7903@kiae.su> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Nov14.064006.7903@kiae.su>, amuller@kiae.su (Andrei 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. -- Marta Moreno | mmoreno@rwth-aachen.de PGP Key fingerprint: 1429 E0CD D1FC A5F4 "Keep the channels open."