| 摘要 |
PURPOSE:To realize a 2-channel surround system corresponding to the surround system of 3 channels or over by adding an audio signal outputted directly corresponding to an original audio signal at both left and right channels and an audio signal resulting from the original audio signal outputted via a high pass filter and a delay device so as to synthesize them. CONSTITUTION:Part of an audio signal of left channel inputted from an input terminal 51 in the left channel is directly inputted to an adder 3, and the other audio signal is inputted to the adder 3 via a high pass filter 1 and a delay device 2. The adder 3 adds the audio signal inputted directly and the audio signal inputted via the high pass filter 1 and the delay device 2 to generate a synthesis audio signal corresponding to the 'direct sound' and the 'echo sound' and the synthesized signal is transduced into sound via a left speaker 4 and sounded. This is similar to the circuit component relating to the right channel audio signal. Thus, the surround system corresponding to two sound sources only is realized. |
