| 摘要 |
A communication device, such as a mobile telephone, has a digital signal processor, fast randomly accessible storage and relatively slow storage devices. Instructions are transferred from the slow storage devices to the fast storage devices for execution by the digital signal processor. The device is configure to operate at a full data rate or at a reduced data rate (usually half-rate) within a time division multiplex. Transmission data is stored in the fast storage device during reduced data rate operation. The device is configured to change from reduced data rate operation to full data rate operation, while maintaining communication. While processing previously stored half-data rate data, program instructions for the full data rate mode of operation are written to the fast storage means, while said data is being processed and thereby being removed from said storage means.
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