Signal Processing Device, Signal Processing Method, and Sound Emitting System

• US 20100067716A1
• Filed: 09/01/2009
• Published: 03/18/2010
• Est. Priority Date: 09/12/2008
• Status: Active Grant

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: KATAYAMA, Masaki
• Granted Patent: US 8,848,943 B2
• Time in Patent Office: Days
• US Class Current: 381/99
• CPC Class Codes: H03G 5/025 Equalizers; Volume or gain control in limited frequency bands

Abstract

A signal processing device for supplying sound signals to a first speaker for emitting a sound on a low-pitched sound side and a second speaker for emitting a sound on a high-pitched sound side higher than the low-pitched sound side, includes a control portion that controls a characteristic of the sound signal supplied to the first speaker so that an output level of the first speaker is maintained at a crossover frequency between the first speaker and the second speaker, when an output level of the sound signal supplied to the first speaker is changed.

Claims

1. A signal processing device for supplying sound signals to a first speaker for emitting a sound on a low-pitched sound side and a second speaker for emitting a sound on a high-pitched sound side higher than the low-pitched sound side, comprising:

a control portion that controls a characteristic of the sound signal supplied to the first speaker so that an output level of the first speaker is maintained at a crossover frequency between the first speaker and the second speaker when an output level of the sound signal supplied to the first speaker is changed.

2. The signal processing device according to claim 1, wherein the control portion shifts a cut-off frequency of a filter portion for the first speaker to the low-pitched sound side or the high-pitched sound side in response to an amount of change of the output level of the sound signal that is supplied to the first speaker.

3. The signal processing device according to claim 2, wherein the control portion controls an amount of shift of the cut-off frequency so that the output level of the first speaker is maintained in a frequency band higher than the crossover frequency.

4. The signal processing device according to claim 1, wherein the control portion changes a filter order of a filter portion for the first speaker to high or low in response to an amount of change of the output level of the sound signal that is supplied to the first speaker.

5. A signal processing method, comprising:

supplying a sound signal to a first speaker for emitting a sound on a low-pitched sound side;

supplying a sound signal to a second speaker for emitting a sound on a high-pitched sound side higher than the low-pitched sound side; and

controlling a characteristic of the sound signal supplied to the first speaker so that an output level of the first speaker is maintained at a crossover frequency between the first speaker and the second speaker, when an output level of the sound signal supplied to the first speaker is changed.

6. The signal processing method according to claim 5, wherein in the controlling process, a cut-off frequency of a filter portion for the first speaker is shifted to the low-pitched sound side or the high-pitched sound side in response to an amount of change of the output level of the sound signal that is supplied to the first speaker.

7. The signal processing method according to claim 6, wherein in the controlling process, an amount of shift of the cut-off frequency is controlled so that the output level of the first speaker is maintained in a frequency band higher than the crossover frequency.

8. The signal processing method according to claim 5, wherein in the controlling process, a filter order of a filter portion for the first speaker is changed to high or low in response to an amount of change of the output level of the sound signal that is supplied to the first speaker.

9. A sound emitting system, comprising:

a first speaker that emits a sound on a low-pitched sound side;

a second speaker that emits a sound on a high-pitched sound side higher than the low-pitched sound side; and

a signal processing portion that supplies sound signals to the first speaker and the second speaker;

wherein, when an output level of the sound signal supplied to the first speaker is changed, the signal processing portion controls a characteristic of the sound signal supplied to the first speaker so that an output level of the first speaker is maintained at a crossover frequency between the first speaker and the second speaker.

10. The sound emitting system according to claim 9, wherein the signal processing portion shifts a cut-off frequency of a filter portion for the first speaker to the low-pitched sound side or the high-pitched sound side in response to an amount of change of the output level of the sound signal that is supplied to the first speaker.

11. The sound emitting system according to claim 10, wherein the signal processing portion controls an amount of shift of the cut-off frequency so that the output level of the first speaker is maintained in a frequency band higher than the crossover frequency.

12. The sound emitting system according to claim 9, wherein the signal processing portion changes a filter order of a filter portion for the first speaker to high or low in response to an amount of change of the output level of the sound signal that is supplied to the first speaker.