| 摘要 |
PURPOSE:To allow to listen to a stereo broadcast with symmetry at two listening points by providing a center speaker giving a delay to an L+R signal and reproducing signal while applying sound volume correction between two L and R speakers. CONSTITUTION:Fig. (a) shows the case that a signal Le is applied to an L channel, and sound (e) is obtained from a speaker SP1 and sound e' applied with delay and sound volume correction is obtained from an SP3. Since the e' is delayed by a time difference tau in comparison with the (e), the sound is listened to as if the sound were outputted while being biased to the SP1. Fig. (b) indicates the case that a signal Re is applied to an R channel, and no sound is heard from the speaker SP1 because of the presence of a diode D2, and the sound is listened to from the speaker SP3 only. Fig. (c) shows the case that a signal (e) is applied to both the L and R channels, the sound (e) is obtained from the speaker SP1. Moreover, a signal 2e is applied to the SP3 at the pre-stage to the delay stage, and the sound is localized apparently between the SP1 and SP3 while applying the delay and sound volume correction. |
