Sound reproduction device
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsKenji Shima, Masahiro Hibino
Life of this patent
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Abstract
A sound reproducing device adapted to be operated in a narrow space such as the passenger compartment of an automobile including a voltage amplifying or attenuating circuit for varying a difference signal between stereophonic right and left signals and a filter circuit. The voltage amplifying or attenuating circuit and filter circuit are provided in a circuit which produces a reverberation effect and an acoustic spreading effect for reproduced sound to decrease the closed-room effect. Each of these circuits is provided with a varible resistor, wherein the listener can vary the reverberation and acoustic spreading effects as desired.
Claims8
A sound reproducing device operatively connectable to first and second loudspeakers and to receive a stereo signal including left and right signals, comprising:
- first main signal path circuit means for transmitting a first one of the left and right signals of the stereo signal to the first loudspeaker;
- second main signal path circuit means for transmitting a second one of the right and left signals of the stereo signal to the second loudspeaker;
- means for producing a difference signal equal to the difference between the right and left signals;
- means for varying said difference signal to produce a varied difference signal;
- first addition means for adding the varied difference signal to said first one of the left and right signals in said first main signal path circuit means;
- second addition means for adding a signal whose phase is opposite to the phase of said varied by difference signal to said second one of the left and right signals in said second main signal path circuit means;
- means for phase shifting said varied difference signal to produce a phase shifted varied difference signal;
- third addition means for adding said phase shifted varied difference signal to said first one of the left and right signals in said first main signal path circuit means;
- and
- fourth addition means for adding to said second one of the left and right signals in said second main signal path circuit means a signal whose phase is opposite to the phase of said phase shifted varied difference signal.
Dependencies are inferred from the claim text.