Abstract
This paper describes a digital speech recording system capable of digitizing, storing, and playing back speech signals of arbitrary duration. The maximum duration for continuous speech processing is limited only by disk storage capacity. The system is based on a multiprocessor architecture, with a main processor responsible for file processing and outboard processor I/O control. As implemented, the main processor is a DEC LSI-11/23 microcomputer with 1 MB of main memory and a large-capacity Winchester disk. The outboard processor is an Intel 8085 with 2K local memory for speech buffering. Digitization is accomplished using logarithmic PCM at 8-kHz sampling frequency. Interprocessor communication is achieved with a 16-bit parallel data bus, and the necessary electrical connections and handshaking signals are discussed in detail. The local software modules are described, with attention given to timing and communications protocol considerations.
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