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Loudspeaker unit adapted to environment
| Details |
Inventors: Sasaki, Atsushi;
Assignee: NEC Corporation (JP)
Primary Examiner: Grier; Laura A.
Assistant Examiner:
Attorney, Agent or Firm: Dickstein, Shapiro, Morin & Oshinsky, LLP.
A loudspeaker unit which requires no particular procedure for correction of the acoustic characteristic even if the installation environment of the loudspeaker unit changes, and which can correct, in addition to the frequency characteristic, a sound lag and a phase shift ascribable to the reverberation and an echo of a sound. The loudspeaker unit picks up a sound regenerating from the loud speaker with a microphone, and compares in real time a sound from a sound source with a regenerative sound, referring to a difference therebetween, with reference to the characteristic at an optional frequency and the characteristic of the reverberation or the echo each including the delay time, respectively, and corrects the signal to be sent to the loudspeaker by the result of arithmetic. |
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DETAILED DESCRIPTION An object of the present invention is to provide a loudspeaker unit adapted to the environment and requires no particular procedure for correction of the acoustic characteristic thereof even if the installation environment of the loudspeaker unit changes.
Another object of the present invention is to provide a loudspeaker unit which can correct, in addition to the frequency characteristic of the sound, a sound lag and a phase shift ascribable to the reverberation and the echo of the sound.
The loudspeaker unit of the present invention comprises a microphone for picking up a sound regenerated from a loudspeaker; processing means for comparing in real time an output signal from the microphone with an output signal from a sound source, in particular by referencing the characteristic at an optional frequency and the characteristics of the reverberation as well as of the echo, each including a delay time, respectively, and correcting the signal from the sound source with the difference output signal between the microphone and the sound source; an amplifier for amplifying the output of the processing means; and a loudspeaker unit.
Also in the present invention, a signal to be sent to the loudspeaker is corrected by the result obtained through an arithmetic operation.
Using the result of a comparison operation, a parameter which is used to correct the signal to be sent to the loudspeaker is intermittently renewed.
In the present invention, since the sound characteristic is corrected depending on the regenerative sound source, the correction of the frequency characteristic of the regenerative sound based on the reference signal can advantageously be omitted even if the installation environment of the loudspeaker unit changes.
Further, since the sound picked up by the microphone is compared with the sound from the sound source with reference to the frequency characteristic, the reverberation and the echo characteristic, the invention can effectively correct the reverberation of the sound, the echo delay and the phase shift
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Audio Signal Processing 
