Claims
- 1. A sound field control device for controlling a sound field characteristic in a chamber, comprising:
- a plurality of loudspeakers provided in the chamber;
- a plurality of microphones provided in the chamber;
- a plurality of acoustic feedback signal paths formed between each of the plurality of loudspeakers and each of the plurality of microphones, wherein a length of each of the plurality of acoustic feedback signal paths is different in length than others of the plurality of acoustic feedback signal paths;
- a plurality of electrical feedback signal paths for electrically feeding back collected sound signals collected by the plurality of microphones to the plurality of loudspeakers; and
- a collected sound signal supply control circuit provided in the plurality of electrical feedback signal paths for selectively connecting the plurality of electrical feedback paths over a lapse of time to selectively connect one of the plurality of acoustic feedback signal paths for each one of the plurality of loudspeakers and each one of the plurality of microphones to flatten a frequency characteristic of the sound field characteristic to achieve a space averaging effect so that coloration is reduced and a howling margin is expanded.
- 2. A sound field control device as defined in claim 1, wherein the collected sound signal supply control circuit includes a gain control circuit that variably changes a gain for each collected sound signal supplied to the plurality of loudspeakers over the lapse of time.
- 3. A sound field control device as defined in claim 2, wherein the gain of the gain control circuit for each collected sound signal is variably changed between -.infin.dB and 0 dB.
- 4. A sound field control device as defined in claim 2, wherein the gain of the gain control circuit for each collected sound signal is variably changed between a value above 0 dB.
- 5. A sound field control device as defined in claim 1, wherein the collected sound signal supply control circuit includes a switch circuit that variably turns on or off the plurality of electrical feedback signal paths over the lapse of time.
- 6. A sound field control device as defined in claim 1, further including an electrical delay circuit provided in the plurality of electrical feedback signal paths that electrically delays the collected sound signals collected by the plurality of microphones.
- 7. A sound field control device as defined in claim 6, wherein the electrical delay circuit includes at least one FIR filter.
- 8. A sound field control device as defined in claim 1, wherein the chamber is an L-shaped chamber and the plurality of loudspeakers are arranged in one arm portion of the L-shaped chamber and the plurality of microphones are arranged in another arm portion of the L-shaped chamber.
- 9. A sound field control device as defined in claim 1, wherein the chamber is a square chamber and the plurality of loudspeakers are arranged along a wall of one side of the chamber and the plurality of microphones are arranged along a wall of the opposite side of the chamber.
- 10. A sound field control device as defined in claim 9, which further includes a delay circuit provided for each of the plurality of microphones for delaying the collected sound signals collected by the plurality of microphones.
- 11. A sound field control device as defined in claim 1, wherein the chamber is a square chamber and the plurality of loudspeakers are arranged along a wall of one side of the chamber and the plurality of microphones are arranged along a wall of another side of the chamber adjacent to the side along which the plurality of loudspeakers are arranged.
- 12. A sound field control device as defined in claim 1, wherein the collected sound signal supply control circuit sequentially connects the plurality of electrical feedback signal paths over the lapse of time.
- 13. A sound field control device as defined in claim 1, wherein the collected sound signal supply control circuit randomly connects the plurality of electrical feedback signal paths over the lapse of time.
- 14. A sound field control device for controlling a sound field characteristic in a chamber, comprising:
- a plurality of acoustic feedback signal paths, each including a loudspeaker and a microphone disposed in the chamber and each outputting an electrical signal received by the microphone, wherein a length of each of the plurality of acoustic feedback signal paths is different in length than others of the plurality of acoustic feedback signal paths;
- a plurality of electrical feedback signal paths including a plurality of column signal lines connected to each microphone and a plurality of row signal lines connected to each loudspeaker, wherein the plurality of column signal lines and the plurality of row signal lines are disposed in a matrix; and
- a control circuit that selectively connects the column signal lines and the row signal lines of the plurality of electrical feedback signal paths over a lapse of time to selectively connect some of the plurality of acoustic feedback signal paths to flatten a frequency characteristic of the sound field characteristic to achieve a space averaging effect so that coloration is reduced and a howling margin is expanded.
- 15. A sound field control device for controlling a sound field characteristic in a chamber, comprising:
- a loudspeaker disposed in the chamber and having an input;
- a plurality of microphones disposed in the chamber and each having an output, wherein the plurality of microphones are disposed in different positions relative to each other;
- a plurality of acoustic feedback signal paths that are formed between the loudspeaker and the plurality of microphones in the chamber, wherein the plurality of acoustic feedback signal paths each have a different length from each other; and
- an electrical signal supply circuit provided between the input of the loudspeaker and outputs of the plurality of microphones for selectively connecting the input of the loudspeaker with one of the plurality of outputs of the plurality of microphones over a lapse of time to selectively connect one of the plurality of acoustic feedback signal paths for the loudspeaker and one of the plurality of microphones to flatten a frequency characteristic of the sound field characteristic to achieve a space averaging effect so that coloration is reduced and a howling margin is expanded.
- 16. A sound field control device for controlling a sound field characteristic in a chamber, comprising:
- a microphone disposed in the chamber and having an output;
- a plurality of loudspeakers disposed in the chamber and each having an input, wherein the plurality of loudspeakers are disposed in different positions relative to each other;
- a plurality of acoustic feedback signal paths in the chamber that are formed between the microphone and the plurality of loudspeakers, wherein the plurality of acoustic feedback signal paths each have a different length from each other; and
- an electrical signal supply circuit provided between the output of the microphone and the inputs of the plurality of loudspeakers for selectively connecting the output of the microphone with one of the plurality of inputs of the loudspeakers over a lapse of time to selectively connect one of the plurality of acoustic feedback signal paths for one of the plurality of loudspeakers and the microphone to flatten a frequency characteristic of the sound field characteristic to achieve a space averaging effect so that coloration is reduced and a howling margin is expanded.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-092040 |
Mar 1993 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 08/217,242 filed Mar. 24, 1994, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (2)
Number |
Date |
Country |
169897 |
Jul 1986 |
JPX |
11037 |
Feb 1992 |
JPX |
Non-Patent Literature Citations (1)
Entry |
DC-Controlled Audio Switches and Filter Electronics Components and Applications. vol. 2 No. 1., Nov. 1979. |
Continuations (1)
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Number |
Date |
Country |
Parent |
217242 |
Mar 1994 |
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