From jpopov@clari.net Tue Feb 08 09:55:16 1994 Path: ashpoly!cascade!bigsur!clari!jpopov From: jpopov@clari.net (Joachim Popov) Newsgroups: comp.dsp Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb08.095516.9967@clari.net> Date: Tue, 08 Feb 1994 09:55:16 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. 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. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Joachim Popov | jpopov@clari.net PGP Key fingerprint: 3A37 16D4 1AF2 3F09 "Keep the channels open." From tgarcia@cam.ac.uk Wed Feb 09 10:19:16 1994 Path: ashpoly!cascade!bigsur!cam!tgarcia From: tgarcia@cam.ac.uk (Tobias García) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb09.101916.9500@cam.ac.uk> Date: Wed, 09 Feb 1994 10:19:16 GMT References: <1994Feb08.095516.9967@clari.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Feb08.095516.9967@clari.net>, jpopov@clari.net (Joachim Popov) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Tobias García Hayes Optima 288 @ 33,600 bps "5 sigma is a discovery. 7 is a question."