US 2004/0151326 A1 · Active diffracted sound control apparatus

Abstract

An active diffracted sound control apparatus comprises a reference microphone for measuring the noise information on a noise source side of a sound insulating wall, a first error microphone for measuring the noise information on a noise receiving side of the sound insulating wall, a speaker arranged in the neighborhood of the sound insulating wall K for generating a control sound to reduce the object sound at a sound receiving point, and a control unit for controlling the output of the speaker based on the outputs of the reference microphone and the first error microphone. The control unit is operated based on a first sound transmission characteristic between the first error microphone and the second error microphone for the noise source and a second sound transmission characteristic between the first error microphone and the second error microphone for the speaker.

Claims14

Dependent claims

An active diffracted sound control apparatus comprising:

sound source measuring device arranged on the object sound source area side of a wall body arranged between the object sound source area and a sound receiving area for measuring the object sound information in the neighborhood of the wall body;
direct object sound measuring device arranged on the sound receiving area side of the wall body for measuring the object sound information in the neighborhood of the wall body;
a control sound source arranged in the neighborhood of the wall body for generating a control sound to reduce the object sound at a virtual object sound measuring point in the sound receiving area;
and
object sound control device for controlling the output of the control sound based on the output of the object sound measuring device;
wherein the object sound control device is operated on the basis of a first sound transmission characteristic between the direct object sound measuring point for the object sound source and the virtual object sound measuring point and
a second sound transmission characteristic between the direct object sound measuring point for the control sound source and the virtual object sound measuring point.

4 more elements

An active diffracted sound controller comprising:

sound source measuring device arranged on that part of a wall body having an opening between a controlled sound source area and a sound receiving area which is nearer to the controlled sound source area for measuring the controlled sound information in the neighborhood of the opening;
direct controlled sound measuring device arranged on the part of the opening nearer to the sound receiving area for measuring the controlled sound information in the neighborhood of the opening;
a control sound source arranged in the neighborhood of the opening for generating a control sound for reducing the controlled sound at a virtual controlled sound measuring position in the sound receiving area;
and
controlled sound control device for controlling the output of the control sound based on the output of the controlled sound measuring device;
wherein the controlled sound control device is operated based on a first sound transmission characteristic of the controlled sound source between the direct controlled sound measuring position and the virtual controlled sound measuring position, and a second sound transmission characteristic of the control sound source between the direct controlled sound measuring position and the virtual controlled sound measuring position.

3 more elements

An active diffracted sound control method comprising:

a sound source measuring the controlled sound information at a sound source measuring position in the neighborhood of that part of a wall body which is nearer to the controlled sound source area, the wall body being arranged between the controlled sound source area and the sound receiving area;
a direct controlled sound measuring the controlled sound information at a direct controlled sound measuring position in the neighborhood of that part of the wall body which is nearer to the sound receiving area;
a control sound generating a control sound, at a control sound generating position in the neighborhood of the wall body, for reducing the controlled sound at a virtual controlled sound measuring position in the sound receiving area;
and
a controlled sound controlling the output of the control sound based on the output from the information of the controlled sound measured in the direct controlled sound measuring ;
wherein the controlled sound controlling is operated based on a first sound transmission characteristic of the controlled sound between the direct controlled sound measuring position and the virtual controlled sound measuring position, and a second sound transmission characteristic of the control sound between the direct controlled sound measuring position and the virtual controlled sound measuring position.