JPS6470958A - Level adjusting circuit - Google Patents

Abstract

PURPOSE:To efficiently execute level adjustment by varying a level in a level varying part from a silence level to a set level at the time of fade-in and operating the level in the level varying part from the set level to the silence level at the time of fade-out. CONSTITUTION:At the time of the sound recording of the fade-in, the start of the sound recording of the fade-in is detected by a sound recording detecting part, an output trigger signal is added to an increasing signal generating part 6, the output level of a level varying part 2 is once made into the silence level by the trigger signal, and the output level is adjusted to the level set in a level setting part 9 by raising the level gradually. On the other hand, at the time of the completion of the sound recording of the fade-out, a sound recording control part 32 detects the condition before outputting a terminating signal to a sound recording amplifier 31 and a tape traveling system by means of a sound recording termination detecting part 8 and outputs the trigger signal. By this signal, a decreasing signal generating part 5 outputs a control signal so as to lower the output level of the level varying part 2 gradually, from the level set by the level setting part 9 to the silence level finally.