SOUND SIGNAL OUTPUTTING DEVICE, SOUND SIGNAL OUTPUTTING METHOD, AND COMPUTER-READABLE RECORDING MEDIUM

• US 20090225992A1
• Filed: 03/04/2009
• Published: 09/10/2009
• Est. Priority Date: 03/05/2008
• Status: Active Grant

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: KONAGAI, Yusuke
• Granted Patent: US 8,189,795 B2
• Time in Patent Office: Days
• US Class Current: 381/17
• CPC Class Codes: H04R 1/26 Spatial arrangements of separate transducers responsive to two or more frequency ranges
• CPC Class Codes: H04R 2203/12 Beamforming aspects for stereophonic sound reproduction with loudspeaker arrays
• CPC Class Codes: H04R 2205/022 Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure
• CPC Class Codes: H04R 3/12 for distributing signals to two or more loudspeakers specially adapted for hearing aids H04R25/407
• CPC Class Codes: H04S 1/002 Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution control circuits for electronic adaptation of the sound field H04S7/30
• CPC Class Codes: H04S 2420/07 Synergistic effects of band splitting and sub-band processing
• CPC Class Codes: H04S 3/00 Systems employing more than two channels, e.g. quadraphonic H04S5/00, H04S7/00 take precedence
• CPC Class Codes: H04S 3/002 Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution control circuits for electronic adaptation of the sound field H04S7/30
• CPC Class Codes: H04S 7/305 Electronic adaptation of stereophonic audio signals to reverberation of the listening space H04S7/301 takes precedence

Abstract

A sound signal outputting device includes a receiving section which receives signals on a plurality of channels, a band splitting section which splits the signals on the plurality of channels to produce low-frequency signals whose frequencies are lower than a predetermined frequency respectively, a separating section which separates a correlated component and uncorrelated components between predetermined channels from the low-frequency signals on the plurality of channels, an uncorrelated component outputting section which applies a first directivity to the uncorrelated components of the signals on respective channels to output applied components, and a correlated component outputting section applies a second directivity to the correlated component of the signals on respective channels to output an applied component.

Claims

1. A sound signal outputting device, comprising:

a receiving section which receives signals on a plurality of channels;

a band splitting section which splits the signals on the plurality of channels to produce low-frequency signals whose frequencies are lower than a predetermined frequency respectively;

a separating section which separates a correlated component and uncorrelated components between predetermined channels from the low-frequency signals on the plurality of channels;

an uncorrelated component outputting section which applies a first directivity to the uncorrelated components of the signals on respective channels to output applied components; and

a correlated component outputting section applies a second directivity to the correlated component of the signals on respective channels to output an applied component.

2. The sound signal outputting device according to claim 1, wherein the first directivity is set to a right direction or a left direction with respect to a front direction as a directivity center, and the uncorrelated components produce a surround sound field by a reverberation in a sound field space.

3. The sound signal outputting device according to claim 1, further comprising:

an instantaneous signal level measuring section which measures instantaneous sound pressures of the low-frequency signals on the predetermined channels,

wherein the separating section separates the correlated component and the uncorrelated components from the low-frequency signals on the plurality of channels, based on the instantaneous sound pressures.

4. The sound signal outputting device according to claim 1, further comprising:

a filtering section which processes predetermined signals contained in the low-frequency signals on the plurality of channels by using adaptive filters, the adaptive filters employing the low-frequency signals on other plurality of channels as a target signal respectively, to produce a simulated signal,

wherein the separating section separates the correlated component and the uncorrelated components based on the simulated signal.

5. The sound signal outputting device according to claim 1, wherein the band splitting section splits the signals on the plurality of channels received by the receiving section to produce high-frequency signals whose frequencies are higher than a predetermined frequency respectively, and

the sound signal outputting device further comprising:

a high-frequency surround outputting section which outputs the high-frequency signals on the plurality of channels as a surround sound reproduction.

6. The sound signal outputting device according to claim 5, wherein the uncorrelated component outputting section and the correlated component outputting section are a plurality of low-frequency reproducing woofers;

and

wherein the high-frequency surround outputting section is an array speaker having a plurality of speaker units.

7. A sound signal outputting method, comprising:

receiving signals on a plurality of channels;

splitting the signals on the plurality of channels to produce low-frequency signals whose frequencies are lower than a predetermined frequency respectively;

separating a correlated component and uncorrelated components between predetermined channels from the low-frequency signals on the plurality of channels;

applying a first directivity to the uncorrelated components of the signals on respective channels to output applied components; and

applying a second directivity to the correlated component of the signals on respective channels to output an applied component.

8. A computer-readable recording medium recording a program for causing a computer to execute a sound signal outputting method, comprising:

receiving signals on a plurality of channels;

splitting the signals on the plurality of channels to produce low-frequency signals whose frequencies are lower than a predetermined frequency respectively;

separating a correlated component and uncorrelated components between predetermined channels from the low-frequency signals on the plurality of channels;

applying a first directivity to the uncorrelated components of the signals on respective channels to output applied components; and

applying a second directivity to the correlated component of the signals on respective channels to output an applied component.