| 摘要 |
A signal conversion method and a device for interfacing a PC keyboard 14 with a MIDI sound-generator such as a sound-card fitted within a computer 20 or a standalone sound generator 22. The interface unit can also take inputs from a MIDI keyboard 18 and a PC joystick 16, the latter being used for sound-bending. The interface includes input and output connectors 44, 48, 52, 50, 54 and 62 and associated adaptor circuits 46, 60, 58, 56 and 64 for communication with a microprocessor 40. Read only memories 42 and 43 containing factory and user pre-set data are accessed by the microprocessor 40. In one mode of operation, PC signals generated by the keyboard's keypad are converted into MIDI signals corresponding to the notes of a selectable musical scale such that the root note of the scale is elicited by the same keypad key.
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