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Patent Searching and Data

Document Type and Number:
Japanese Patent JPH0614399
Kind Code:

PURPOSE: To approximate an acoustic space constituted of a direct sound and a reflected sound, and also, to continuously control a ratio of the direct sound to the reflected sound by only a loudspeaker arranged in front of a listener.

CONSTITUTION: A time delaying circuit 14 generates a signal S3 having no time delay and a signal S5 having a time delay from an input signal S1. An amplitude control circuit 101 controls amplitude of an output of the time delaying circuit 14, respectively, and inputs its output signals S20, S22 to a first and a second amplifiers 4, 3. A first loudspeaker 7 is driven by a first amplifier 4, and a second and a third loudspeakers 21, 22 connected in opposite phases with each other are driven by a second amplifier 3. An opening angle of the center axis of a directional characteristic of a second and a third loudspeakers 21, 22 is made to be about 180 degrees, and the direction of the center axis of a directional characteristic of a first loudspeaker 7 is aligned with the direction of a symmetrical axis for dividing its opening angle into two equal parts. Also, the other channel for inputting a signal S2 is also constituted in the same way.

Watanabe, Kimiharu
Sone, Masako
Application Number:
Publication Date:
January 21, 1994
Filing Date:
June 25, 1992
Export Citation:
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International Classes:
H04S1/00; (IPC1-7): H04S1/00
Attorney, Agent or Firm:
小鍜治 明 (外2名)