Patent ID: 6629000
Filing Date: 2003-09-30
Classification: G06T,G11B,G11C

Abstract:
A portable sound reproducing system for reproducing compressed digital sound data into an audible audio signal, comprising:a Direct Memory Access (DMA) Bus across which a received compressed digital sound data is stored and across which the stored sound data is accessed to be reproduced; a MEM/IO Bus across which a control data signal is provided to control operations on said DMA Bus; a Bus Bridge Access Controller interposed between said DMA Bus and said MEM/IO Bus that selectively controls operations on said DMA Bus to selectively store the received compressed digital sound data and to selectively resume an operation to reproduce the stored sound data in accordance with the control signal from said MEM/IO Bus; a CPU connected to said MEM/IO Bus that controls operations related to conversion of the stored sound data into an audible format; an interrupter controller connected to said MEM/IO Bus that outputs a further control signal to control the CPU when an input/output operation is ended or an error occurs in the CPU; a power controller connected to said MEM/IO Bus to stably supply power from a power processor as operational power to the CPU, and for cutting off the power when an error occurs; a keyboard interface connected to said MEM/IO Bus that interfaces key select signals applied from an information selecting means; an LCD controller connected to said MEM/IO Bus that controls electric current supplied to a matrix of an information display means to control a display during operation of the sound reproducing system; an extended ROM interface connected to said MEM/IO Bus that interfaces a connection with an extended ROM that can be added to extend a scope of programs or memory; and a timer connected to said MEM/IO Bus that counts time information needed for receiving a data download and for reproducing the downloaded data, and data interrupting required to operate the system.