Patent ID: 6088601
Filing Date: 2000-07-11
Classification: H04B

Abstract:
A sound coder/decoder circuit for encoding sound data to be transmitted and decoding received and encoded sound data, during each one cycle comprising:silent judging means for making a judgement whether said sound data to be transmitted within said one cycle are silent data, before encoding said sound data to be transmitted;a controlled circuit having a circuit for encoding said sound data to be transmitted and having a switching circuit for powering on/off said circuit for encoding; andpower controlling means for turning off said switching circuit to power off said circuit for encoding during a time for encoding within said one cycle, when said judgement is that said sound data to be transmitted are silent data;wherein said one cycle is a cycle of a frame synchronization pulse, andwherein said power control means includes:a counter circuit for counting a clock, said counter circuit being initialized by said frame synchronization pulse;a constant setting part for providing a set value;a comparator circuit for activating a coincident signal when a count of said counter circuit coincides with said set value; anda flip-flop circuit to be set to one state so as to cause said switching circuit to turn off when said judgement is that said sound data to be transmitted are silent data and to be set to another state so as to cause said switching circuit to turn on when said coincident signal becomes activate.