Patent ID: 6816491
Filing Date: 2004-11-09
Classification: G11B,H04N

Abstract:
A multiplexed audio data decoder apparatus, for inputting a group of packets, each being formed by packetizing audio data sequences which are compressed and encoded and by multiplexing a plurality of those sequences, and for selectively decoding one audio data sequence which is designated by a user, comprising:a demultiplexer for extracting the one audio data sequence which is designated by the user from said group of packets depending upon a property or attribute information which each packet has, and further for extracting a method of compression and encoding which is applied for compressing the audio data sequence from a header information which said each audio data sequence has; a first memory in which are accumulated decoding program codes including decoding algorithms corresponding to said method of compression and encoding; a digital signal processor for decoding the compressed audio data sequences in accordance with said decoding program codes, sequentially; a read-only memory, in which are accumulated a plurality of the decoding program codes, each corresponding to each one of said plural methods of compression and encoding; and controller means for detecting change in said method of compression and encoding, and for transferring the decoding program code corresponding to the method of the compression and encoding after being changed, from said read-only memory to said first memory, wherein said digital signal processor begins decoding processing by using the decoding program code which is transferred to said first memory.