| 摘要 |
PURPOSE:To accurately synchronize the generating processing of a musical tone signal by a processor with musical tone control processing by an out-fitted processing circuit in a device which executes the generating processing of the musical tone signal and another musical tone signal processing by a universal processor and the out-fitted processing circuit. CONSTITUTION:No complete coincidence can be obtained between the time interval of musical tone sampling data inputted from a CPU and a sampling interval due to the change of the execution time of a sound source processing program in the CPU in an arithmetic circuit 2305 provided at the outside of the CPU which executes sound source processing and which executes oversampling processing, noise shaping processing, and dither processing, etc., on the sound source sampling data from the CPU. Therefore, an input latch 2601 latches the musical tone sampling data from the CPU with an interrupt signal INT synchronized with the sampling interval, and inputs it to a circuit at the rear stage. As a result, the musical tone sampling data outputted from the CPU can be inputted to the arithmetic circuit 2305 with a constant time interval completely synchronized with the sampling timing. |
