MAG_TAPE_PRINT_THROUGH_SUPPRESSOR

Published:2009/7/24 4:50:00 Author:Jessie | From:SeekIC

Echoes occurring before and after true signal in recorded magnetic tape stored for some lime, called print-through, and noticeable chiefly during soft musical passages and during recorded speech or singing, are sup pressed by biased. diode type of quieting are that silences audio channel whenever signal drops to 40 db below peak. Each diode is back-biased 0.1 V. If program peaks are 10 V, diodes become nonconducting for all signals more than 40 db below this peak. To prevent loss of desired signal near the zero axis, signals above the threshold are amplified, recti0ed, filtered, and used in time-constant circuit to keep diodes conducting throughout each spoken word.-D. Cronin, Squelch Circuit Mutes Magnetic Tape Echoes, Electronics, 31:19, p 66-67.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Audio_Circuit/MAG_TAPE_PRINT_THROUGH_SUPPRESSOR.html

Print this Page | Comments | Reading(3)