| 摘要 |
PURPOSE: A digital sound system for play using EPROM and Micom is provided to play a high quality sound near to a sound original source, easily interface, freely change sound without an additional cost, and minimize influence of environment. CONSTITUTION: A Micom functions to generate a frequency, and controls various functions. A digital sound card selects EPROM, has a function of digital/analogue conversion, generates a constant voltage, and amplifies a sound by using an exclusive audio buffer. A software converts a sound wave data into an EPROM file. A programmed Micom generates a sampling frequency. A programmed Micom judges various external conditions and recognizes automatically an end of the EPROM file. A D/A converter(13) converts a digital into an analogue. A low pass filter(12) removes a harmonics noise which is generated during digital/analogue conversion. An audio buffer amplifier(17) amplifies a D/A converted sound. A TR(19) drives to display an audio output.
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