MOBILE RADIO COMMUNICATION SYSTEM CAPABLE OF DISTRIBUTING DIGITAL AUDIO DATA

摘要

PROBLEM TO BE SOLVED: To provide a digital mobile radio communication system which can distribute music data in a short time and prevent large-quantity duplication using the system. SOLUTION: Compressed digital audio data are obtained by accessing a data base. The compressed data are received by a mobile terminal machine P from a base station (distribution center) and stored and reproduced on the mobile terminal machine P. The amount of the communication data is reduced by making use of a compression system such as MPEG and the communication time can be greatly shortened. The mobile terminal machine P writes the compressed data sent from a cellular controller to a storage medium M using an audio memory controller. A controller CTRL for the storage medium M has a decoder which decompresses the stored compressed data and a deteriorating circuit which deteriorates the sound quality at decompression of the stored compressed data. The sound quality deterioration is actualized by a technology which divides the audio data into subordinate frequency bands and attenuates specific frequency bands by filtering them.