| 摘要 |
PURPOSE:To attain transposition and modulation to an optional key code at the reproduction by providing a key board playing information change means applying a change control in the unit of a key to key board playing information representing keys parted toward a high or a low frequency tone by a desired number of keys. CONSTITUTION:A shift register 87 is loaded in parallel to write a status word as prescribed information into the register 87. Bit number is written in registers 86, 87 and the registers 86, 87 are brought into the shift right mode by a shift control register 90 to count down a counter 88. In this case, how many degrees are to be modulated toward the high frequency or low frequency tone depending whether how many bits of the content of the register 86 are to be shifted right or left, is decided. In applying a prescribed modulation, a prescribed shift num ber is written in the counter 88. The register 86 is set to the shift right or left mode according to the prescribed modulation direction, the register 87 is brought into the clock-in bit mode to count the counter 88. |
