Key assigner for use in electronic musical instrument

In an electronic musical instrument, key switches are scanned sequentially and repetitively in a high scanning rate to deliver key data consisting of a pulse existence at an assigned time slot and representing ON-OFF states of the key switches. The key data is converted into key codes of digital notation. The key codes are assigned to and memorized in time-shared channels of a high time-sharing rate. A time-sharing rate converter reads out the key codes of digital notation and produces key gate control signals at corresponding ones of individual output terminal in a low time-sharing rate.