All music are by different frequency scale and the length of its duration is achieved. Music is different from the various scales according to some of their players with the formation of a certain period of time for each of the musical scale and duration of the existence of its data segment, and then depending on the value button to select a different scale and timetable, and then have the use of counter scale frequency. And we learned there can produce a variety of frequency counters, so we mainly produce the note counter 8253, with 8255 parallel interface to control the speaker s switch to play the music functions.

yinyuebofangqi.doc

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