RECORDING AND REPRODUCING METHOD FOR ACCOMPANIMENT SIGNAL AND AUTOMATIC KEY CONTROLLER FOR ORCHESTRAL ACCOMPANIMENT DEVICE

摘要

PURPOSE:To provide the automatic key controller for the orchestral accompaniment device which automatically performs key control. CONSTITUTION:When a signal is recorded on a laser disk (recording medium), a multiplied accompaniment signal W1 as the recording signal of a sine wave is additionally recorded on the laser disk in the character information period beta1 of the vertical blanking signal of a video signal and when the signal is reproduced, the signal W1 is extracted to obtain the accompaniment signal. Therefore, the accompaniment signal of the sine wave can be obtained from the laser disk. The automatic key controller for the orchestral accompaniment device detects a deviation in key from the highest frequencies of the obtained accompaniment signal and a song signal and corrects the key of the accompaniment according to the key deviation.