| 摘要 |
PURPOSE:To reduce wiring in number and to improve productivity and reliability by supplying serial bit signals corresponding to plural keys individually to the 1st processor. CONSTITUTION:Since serial bit signals corresponding to keys 33c individually are supplied to the 1st processor, the transmission of the serial bit signals requires a small number of lines even when the number of keys increases, and consequently the number of wirings is decreased to improve the productivity and reliability. In response to the series bit signals, the 1st processor 43 derives parallel bit signals to control acoustic devices 45-47, speeding the processing. Further, the parallel bit signals are supplied from the processor 43 to the 2nd processor 44 to increase its processing speed. The number of lines for the transmission of the parallel bit signals is much less than that of keys. |
