From phughes@clari.net Mon Nov 28 08:52:27 1994 Path: ashpoly!cascade!brgate!saturno!clari!phughes From: phughes@clari.net (Pavel Hughes) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Nov28.085227.3538@clari.net> Date: Mon, 28 Nov 1994 08:52:27 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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? -- Pavel Hughes Tape trading list upon request. SASE required for international mail. From mkang@earthlink.net Tue Nov 29 19:11:27 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!mkang From: mkang@earthlink.net (Matthias Kang) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Nov29.191127.1081@earthlink.net> Date: Tue, 29 Nov 1994 19:11:27 GMT References: <1994Nov28.085227.3538@clari.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Nov28.085227.3538@clari.net>, phughes@clari.net (Pavel Hughes) 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. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Matthias Kang SupraFAXModem 28.8 @ 28,800 bps "Measuring a record you own is listening, not piracy."