VARIABLE LENGTH CODE DECODER

摘要

PURPOSE: A variable length code decoder is provided to decode efficiently video and audio data coded by variable length codes. CONSTITUTION: A buffer(100) stores bit stream data as data of 16 bits and outputs the stored data according to a read signal. The first latch portion(200) stores and outputs data of the buffer(100). A multiplexer portion(300) outputs selectively output data of the first latch portion(200). A barrel shift portion(400) shifts output data of the multiplexer portion(300) according to a control signal and outputs data of a constant bit number. The second latch portion(500) stores temporarily output data of the barrel shift portion(400) and outputs the stored data to a decoding table(600) and the barrel shift portion(400), respectively. The decoding table(600) decodes output data of the second latch portion(500) and outputs a bit length value of a decoded code word. A control portion(700) adds the bit length value of the decoded code word to an accumulated bit length values and outputs a control signal.