| 摘要 |
In a stereo system having sum and difference signals that are processed for stereo image enhancement, apparent directivity of the stereo sound is increased by the use of servo systems (40,44) for the left and right processed difference signals (L - R)p, (R - L)p. Each of the left and right servos (40,44) responds to the respective left or right stereo input signal (Lin, Rin) and amplifies increases in the respective left or right processed difference signals. The amount of amplification is controlled by feeding back the amplified or directivity enhanced difference signal (L - R)pe, (R - L)pe, first comparing it with the processed difference signal (L -R)p, (R - L)p before directivity enhancement, and then combining it with the input signal (Lin, Rin) in a preselected ratio so as to control the amount of amplification of the processed difference signal that is provided for directivity enhancement. <IMAGE> |
