| 摘要 |
Disclose is a four-channel surround-sound generator capable of generating a first surround-sound in phase to a basic channel reproduction sound and a second surround-sound out of phase thereto, by employing a channel-switching control circuit and a channel-sound delaying circuit. Said generator has a first-channel sound reproduction means and a second-channel sound reproduction means, each reproducing a respective channel-sound through a speaker, and further includes a third-channel amplifier and a fourth-channel amplifier for amplifying said each received sound to a signal level adequate to a first surround speaker and a second surround speaker, respectively, surround mode selection means for, in response to a first mode selection control signal, enabling or disabling to filter said received first-channel and second-channel sounds with a given bandwidth, surround-sound output control means for selectively enabling or disabling to make delay of the filtered first-channel and second-channel sounds supplied from the surround mode selection means, in response to a second mode selection control signal, and means for buffering control signals applied from a microcomputer, to provide said surround mode selection means with said first mode selection control signal and/or said surround-sound output control means with said second mode selection control signal.
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