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Author
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Topic: Analog sound distorced
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Aaron Sisemore
Flaming Ribs beat Reeses Peanut Butter Cups any day!
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Posts: 3061
From: Rockwall TX USA
Registered: Sep 1999
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posted 04-25-2001 08:12 PM
>>If my reader is reading part of DTS or perforation, I should hear thumping, bumping or similar sound always, right?<<If the DTS timecode is being picked up at the solar cell, it will sound like a grinding, rumbling, or as you described, 'croaking' usually rhymically (like a 'wocka-wocka-wocka' or 'modem noise' type sound, usually heavy in the bass region unless the timecode is really in the scanning beam) usually in one or more channels (uaually the loudest in the left channel if played in stereo). Perforations being read will cause a constant 96Hz 'humming' or 'buzzing' tone, also varying in volume and timbre depending on how much of the perfs are being read by the beam. Either way something is not holding your film in alignment as its running, however there are instances of prints with the DTS code printed too far to the right making it impossible to avoid reading timecode, usually necessitating a replacement reel. Hope This Helps! Aaron
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John Pytlak
Film God
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Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 04-26-2001 07:45 AM
Any chance Film-Tech could have a library of audio files on-line, so people could hear what various problems sound like? (e.g., 96 perf "motorboating", scanning the DTS time code, poor soundtrack application "whooshing" and "thumping", sibilant distortion, clipping, wow/flutter, etc.).------------------ John P. Pytlak, Senior Technical Specialist Worldwide Technical Services, Entertainment Imaging Eastman Kodak Company Research Labs, Building 69, Room 7419 Rochester, New York, 14650-1922 USA Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243 E-Mail: john.pytlak@kodak.com Web site: http://www.kodak.com/go/motion
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