Bit rate change functional attaching data compression manner and the device by DSP

摘要

PURPOSE:To obtain the data compression device with bit rate changeover function by a DSP and its method in which one DSP copes with three kinds of bit rate and plural input and output channels are supported. CONSTITUTION:A 1st changeover means 7 and a 2nd changeover means 8 select input output channels IN1, IN2, IN3, IN4 and OUT1, OUT2, OUT3, OUT4 respectively. Furthermore, an internal program to compress PCM data in 64kbit/ s into data with the bit rate of 32kbit/s, 24kbit/s and 16kbit/s is incorporated into the DSP1 and any bit rate is freely selected by using any of control commands 10a, 10b, 10c and 10d externally.