Audio processing device, method of audio processing, storage medium, and electronic musical instrument
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United States of America Patent
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Jul 18, 2017
Grant Date -
Jun 15, 2017
app pub date -
Dec 13, 2016
filing date -
Dec 14, 2015
priority date (Note) -
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Abstract
A delay time counter in a DSP cyclically counts a sampling clock from zero to a delay time sampling count and issues a delay time interrupt to a CPU each time the sampling clock count reaches the delay time sampling count. The CPU measures a time difference between each time the DSP issues the delay time interrupt and each time sequence clock interrupts occur a number of times corresponding to the delay time. Then, in order to reduce this time difference, the CPU increases or decreases a maximum count that is set to the sequence clock counter. Therefore, in the next delay process, the shift between the time by which the automatic performance is advanced by the CPU (which is equal to the delay time) and the timing of the delay process executed by the DSP (which is also equal in length to the delay time) will be corrected.
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