| 摘要 |
PURPOSE:To obtain a sound field having a spreading feeling by taking out a high frequency component higher than a prescribed frequency of a difference signal of right and left side original signals, adding these high frequency components to the difference signal delayed by a charge coupling element and supplying to both side speakers of a rear section. CONSTITUTION:The right and left side original signals L, R obtained in input terminals 10L, 10R are supplied to a subtraction circuit 21 and the difference signal L-R of the original signals L. R of both the sides is obtained. This difference signal (L-R)x is supplied to a delay circuit 24 constituted by a BBD and a clock is supplied to the delay circuit 24 from a clock generating circuit 25. Thereby, in the delay circuit 24, the difference signal (L-R)x is delayed, the output of the delay circuit 24 is supplied to an LPF26 and a delayed difference signal (L-R)d is obtained from the LPF26. Then, the delayed difference signal (L-R)d is supplied to an adding circuit 27. Then, the sound field having the spreading feeling is formed, for instance, a fully natural sound of high pitched tone is reproduced from the rearward both speakers. |
