Composite loudspeaker apparatus and driving method thereof

• US 5,621,804 A
• Filed: 07/29/1996
• Issued: 04/15/1997
• Est. Priority Date: 12/28/1993
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation), Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Beppu, Satoshi
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): LEE, PING
• Application Number:
  US08/688,219
• Time in Patent Office: 260 Days
• Field of Search: 381/159, 381/154, 381/153, 381/86, 381/24, 381/90, 381/88, 381/188, 381/205, 381/182, 381/186, 381/185, 181/145, 181/144, 181/148, 181/199
• US Class Current: 381/332
• CPC Class Codes: H04R 1/2819 for loudspeaker transducers
• CPC Class Codes: H04R 1/2834 for loudspeaker transducers
• CPC Class Codes: H04R 1/2842 for loudspeaker transducers
• CPC Class Codes: H04R 5/02 Spatial or constructional arrangements of loudspeakers

Abstract

A composite loudspeaker apparatus including a cabinet which has a first air chamber and a second air chamber having a sound port, a drone cone or a resonance duct, adjacent to each other, wherein the first air chamber has a first loudspeaker driven by the audio signal of one of the left (L) and right (R) channels, and the second air chamber has a second loudspeaker driven by the low frequency component of the synthesized audio signal of the L and R channels mounted therein. The apparatus has another cabinet wherein a third loudspeaker driven by the audio signal of the other of the L and R channels is mounted therein. Another cabinet has a sound port, a drone cone or a resonance duct.

Claims

1. A composite loudspeaker apparatus, comprising:

a cabinet including, a first air chamber and a second air chamber adjacent to said first air chamber;

a first loudspeaker, mounted in said first air chamber of said cabinet;

a second loudspeaker, mounted in said second air chamber of said cabinet, at a boundary of said first air chamber and said second air chamber;

means for driving said first loudspeaker with an entire frequency spectrum of one of a left and right channel audio signal; and

means for driving said second loudspeaker with a synthesized audio signal, synthesized from the left and right channel audio signals,

wherein said second air chamber includes a sound port, a drone cone or a resonance duct.

2. The composite loudspeaker apparatus of claim 1,

wherein said cabinet includes a third air chamber, having a sound port, a drone cone or a resonance duct, adjacent to said second air chamber.

3. The composite loudspeaker apparatus of claim 1,

wherein the signal component driving said second loudspeaker is in phase with the signal component driving said first loudspeaker.

4. The composite loudspeaker apparatus of claim 3, further comprising:

a low-pass filter for passing only low frequency components of the synthesized audio signal to said second loudspeaker.

5. The composite loudspeaker apparatus of claim 1,

wherein said second loudspeaker is disposed to oppose a back side of said first loudspeaker.

6. A composite loudspeaker apparatus, comprising:

a first cabinet having a first chamber and a second air chamber, adjacent to said first air chamber;

a first loudspeaker, mounted in said first air chamber of said first cabinet;

a second loudspeaker, mounted in said second air chamber of said first cabinet, at a boundary of said first air chamber and said second air chamber;

means for driving said first loudspeaker with an entire frequency spectrum of one of a left and right channel audio signal;

synthesizing means for synthesizing the left and right channel audio signals to produce a synthesized audio signal;

means for driving said second loudspeaker with the synthesized audio signal generated by said synthesizing means;

a second cabinet;

a third loudspeaker, mounted in said second cabinet; and

means for driving said third loudspeaker with an entire frequency spectrum of the other of the left and right channel audio signals,

wherein said second air chamber includes a sound port, a drone cone or a resonance duct.

7. The composite loudspeaker apparatus of claim 6,

wherein said first cabinet includes a third air chamber, having a sound port, a drone cone or a resonance duct, wherein said third air chamber is adjacent to said second air chamber.

8. The composite loudspeaker apparatus of claim 6,

wherein the signal component driving said second loudspeaker is in phase with the signal component driving said first loudspeaker.

9. The composite loudspeaker apparatus claim 8, further comprising:

a low-pass filter for passing only low frequency components of the synthesized audio signal obtained from said synthesizing means to said second loudspeaker.

10. The composite loudspeaker apparatus of claim 6,

wherein said second loudspeaker is mounted to oppose a back surface of said first loudspeaker.

11. The composite loudspeaker apparatus of claim 6,

wherein said second cabinet includes a third air chamber and a fourth air chamber including a sound port, a drone cone or a resonance duct;

said third loudspeaker, being disposed in said third air chamber; and

a fourth loudspeaker, disposed in said fourth air chamber.

12. The composite loudspeaker apparatus of claim 6,

wherein said second cabinet includes a third air chamber having a sound port or a drone cone and with a fourth air chamber including a sound port, a drone cone or a resonance duct and

said third loudspeaker being disposed in said third air chamber.

13. A method of driving a composite loudspeaker apparatus, comprising the steps of:

driving a loudspeaker for full-range reproduction, mounted in a first air chamber of a cabinet partitioned into at least two air chambers, with an entire frequency spectrum of one of a left and right channel audio signal; and

driving a low frequency range reproduction loudspeaker, mounted in a second air chamber at a boundary of the first air chamber and the second air chamber including a sound port, a drone cone or a resonance duct with a low frequency component of a synthesized audio signal, synthesized from the left and right channel audio signals.

14. The method of claim 13, wherein the low frequency range reproduction loudspeaker is driven in phase with the full-range reproduction loudspeaker.