Loudspeaker device

• US 7,058,186 B2
• Filed: 11/29/2000
• Issued: 06/06/2006
• Est. Priority Date: 12/01/1999
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Tanaka, Hidekazu
• Primary Examiner(s): Grier, Laura A.
• Application Number:
  US10/148,011
• Publication Number:
  US 20030108213A1
• Time in Patent Office: 2,015 Days
• Field of Search: 381/83, 381/93, 381/96, 381 58- 59, 381/103, 381/95, 381/91, 381/61
• US Class Current: 381/95
• CPC Class Codes: H04R 3/002 Damping circuit arrangements for transducers, e.g. motional feedback circuits

Abstract

An anti-oscillation loudspeaker device where a reproduced sound is compensated based on a acoustic signal detected by a microphone and a reproduced band is enlarged is provided. In this loudspeaker device, a microphone is placed near a position where sound pressure of resonance occurring in a closed space for at least one of height, width, and depth of the inside of a cabinet is minimum. An influence of the resonance is restrained, a feedback circuit becomes stable, and a feedback amount increases.

Claims

1. A loudspeaker device comprising:

an amplifier for amplifying an input signal;

a cabinet having an opening;

a loudspeaker unit mounted to the opening so as to close said cabinet for reproducing an output signal of said amplifier;

a microphone placed in said cabinet for detecting an acoustic output of said loudspeaker unit; and

a feedback circuit for feeding back an acoustic output signal of said microphone to an input of said amplifier,

wherein said microphone is placed substantially at a position where sound pressure of resonance occurring in a closed space in said cabinet is a minimum for said closed space.

2. The loudspeaker device according to claim 1 further comprising a bracket for placing and mounting said microphone in said cabinet.

3. A loudspeaker device comprising:

an amplifier for amplifying an input signal;

a cabinet having an opening;

a loudspeaker unit mounted to the opening so as to close said cabinet for reproducing an output signal of said amplifier;

a microphone placed in said cabinet for detecting an acoustic output of said loudspeaker unit; and

a feedback circuit for feeding back an acoustic output signal of said microphone to an input of said amplifier,

wherein said microphone is placed substantially at a position where sound pressure of resonance occurring in a closed space for one of height, width, and depth of an inside of said cabinet is a minimum for said closed space.

4. The loudspeaker device according to claim 3 further comprising a bracket for placing and mounting said microphone in said cabinet.

5. A loudspeaker device comprising:

an amplifier for amplifying an input signal;

a cabinet having an opening;

a loudspeaker unit mounted to the opening so as to close said cabinet for reproducing an output signal of said amplifier;

a microphone placed in said cabinet for detecting an acoustic output of said loudspeaker unit; and

a feedback circuit for feeding back an acoustic output signal of said microphone to an input of said amplifier,

wherein said microphone is placed substantially at a common position where respective resonance occurring in a closed space for at least two of height, width, and depth of an inside of said cabinet is a minimum for said closed space.

6. The loudspeaker device according to claim 5 further comprising a bracket for placing and mounting said microphone in said cabinet.

7. A loudspeaker device comprising:

a cabinet having an opening;

a loudspeaker unit mounted to the opening so as to close said cabinet; and

a microphone placed in said cabinet for detecting an acoustic output of said loudspeaker unit,

wherein said microphone is placed substantially at a position where sound pressure of resonance occurring in a closed space in said cabinet is a minimum for said closed space.

8. The loudspeaker device according to claim 7 further comprising a bracket used for placing and mounting said microphone in said cabinet.

9. A loudspeaker device comprising:

a cabinet having an opening;

a loudspeaker unit mounted to the opening so as to close said cabinet and being mounted to the opening so as to close said cabinet; and

a microphone placed in said cabinet for detecting an acoustic output of said loudspeaker unit,

wherein said microphone is placed substantially at a position where sound pressure of resonance occurring in a closed space for one of height, width, and depth of an inside of said cabinet is a minimum for said closed space.

10. The loudspeaker device according to claim 9 further comprising a bracket for placing and mounting said microphone in said cabinet.

11. A loudspeaker device comprising:

a cabinet having an opening;

a loudspeaker unit mounted to the opening so as to close said cabinet and being mounted to the opening so as to close said cabinet; and

a microphone placed in said cabinet for detecting an acoustic output of said loudspeaker unit,

wherein said microphone is placed substantially at a position where sound pressure of resonance occurring in a closed space for at least two of height, width, and depth of an inside of said cabinet is a minimum for said closed space.

12. The loudspeaker device according to claim 11 further comprising a bracket for placing and mounting said microphone in said cabinet.