| 摘要 |
PURPOSE:To obtain the expanding feelings of a sound field suitable to a sound source by varying either one of sound signal levels of a mixed sound signal and a delay mixed sound signal. CONSTITUTION:A difference sound signal (L-R) obtained by a subtractor circuit 7 and the addition signal of said difference sound signals, which is available from a delay circuit 8, are supplied to a backward left speaker 11, while a subtraction signal is supplied to a backward right speaker 12. Accordingly, when a mobile contact 19a is positioned at one fixed contact 19b, the sound signal, where a delay difference sound signal DELTAt(L-R) is more emphasized than the difference sound signal (L-R), is supplied to the backward speakers 11 and 12, and therefore the expansion of the sound supplied from the backward speakers 11 and 12 is narrowed, thereby obtaining the expanding feeling of the sound field suitable to a movie reproduction. Thus the expanding feeling of the sound field can be reduced and increased in the movie reproduction and music reproduction, respectively. |
