| 摘要 |
PURPOSE: A service method for a plurality of voice mailing subscribers is provided by implementing one shared memory corresponding to a multiple DSP(Digital Signal Processor) as a memory interface between the DSP and a CPU, and using an auto buffering function of the DSP that buffers IO of a plurality of channels via its serial ports. CONSTITUTION: A voice mailing service method comprises steps of buffering the IO of the Cannes via the serial ports of the DSP, performing simultaneously the auto buffering function and a memory access function through a timing generator, controlling enabling a serial data channel for holding a plurality of channels of the DSP, enabling a timer enable interrupt at an initial stage and enabling an auto buffering interrupt at a timer logic interrupt for an accurate timing of the auto buffering within the DSP. The service method processes smoothly ADPCM, DTMF and a command by a block unit by using a timer interrupt logic to reduce an overhead of a system operating the multiple DSP.
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