Audio Signal Processing System

• US 20080089524A1
• Filed: 09/24/2007
• Published: 04/17/2008
• Est. Priority Date: 09/25/2006
• Status: Active Grant

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: Takeuchi, Eiji
• Granted Patent: US 8,737,629 B2
• Time in Patent Office: Days
• US Class Current: 381/57
• CPC Class Codes: G10K 11/1752 Masking
• CPC Class Codes: H03G 3/32 the control being dependent upon ambient noise level or sound level
• CPC Class Codes: H04K 2203/12 for acoustic communication
• CPC Class Codes: H04K 3/42 characterized by the control of the jamming frequency or wavelength
• CPC Class Codes: H04K 3/43 characterized by the control of the jamming power, signal-to-noise ratio or geographic coverage area
• CPC Class Codes: H04K 3/45 characterized by including monitoring of the target or target signal, e.g. in reactive jammers or follower jammers for example by means of an alternation of jamming phases and monitoring phases, called "look-through mode"
• CPC Class Codes: H04K 3/825 by jamming
• CPC Class Codes: H04R 29/00 Monitoring arrangements; Testing arrangements for hearing aids H04R25/30; detection of loudspeaker connection H04R5/04; sound-field adaptation dependent on speaker detection H04S7/308

Abstract

An audio signal processing system includes: a receiving section which receives a plurality of audio signals, a process period specifying section which specifies a silent period in other audio signals except a particular audio signal that are received by the receiving section, respectively, a sound volume level adjusting section which decreases a sound volume level of the particular audio signal, in a period specified by the process period specifying section as a silent period in any of the other audio signals, and an outputting section which outputs the particular audio signal whose sound volume level is adjusted by the sound volume level adjusting section.

Claims

1. An audio signal processing system, comprising:

a receiving section which receives a plurality of audio signals;

a process period specifying section which specifies a silent period in other audio signals except a particular audio signal that are received by the receiving section, respectively;

a sound volume level adjusting section which decreases a sound volume level of the particular audio signal, in a period specified by the process period specifying section as a silent period in any of the other audio signals; and

an outputting section which outputs the particular audio signal whose sound volume level is adjusted by the sound volume level adjusting section.

9. The audio signal processing system according to claim 1, wherein the process period specifying section includes:

a sound volume level sensing section which senses sound volume levels of the plurality of audio signals that are received by the receiving section; and

a specifying section which specifies a period during which the sound volume level that is sensed by the sound volume level sensing section is below a predetermined level continuously in excess of a predetermined time, as the silent period.

11. The audio signal processing system according to claim 1, wherein the process period specifying section has a specifying section which receives data indicating silent periods attached to the plurality of audio signals, and specifies the silent periods of the plurality of audio signals from the data.

2. An audio signal processing system, comprising:

a receiving section which receives a plurality of audio signals;

a process period specifying section which specifies a silent period in other audio signals except a particular audio signal that are received by the receiving section, respectively;

a frequency characteristic correcting section which executes either a process of removing a predetermined frequency band component from the particular audio signal or a process of correcting the particular audio signal into an audio signal having a frequency characteristic that is similar to the other audio signals, in a period specified by the process period specifying section as the silent period in any of the other audio signals; and

an outputting section which outputs the particular audio signal whose frequency characteristic is corrected by the frequency characteristic correcting section.

15. The audio signal processing system according to claim 2, wherein the process period specifying section includes:

a sound volume level sensing section which senses sound volume levels of the plurality of audio signals that are received by the receiving section; and

a specifying section which specifies a period during which the sound volume level that is sensed by the sound volume level sensing section is below a predetermined level continuously in excess of a predetermined time, as the silent period.

19. The audio signal processing system according to claim 2, wherein the process period specifying section has a specifying section which receives data indicating silent periods attached to the plurality of audio signals, and specifies the silent periods of the plurality of audio signals from the data.

3. An audio signal processing system, comprising:

a receiving section which receives a plurality of audio signals;

a process period specifying section which specifies a silent period in a particular audio signal received by the receiving section;

an audio signal generating section which generates a second audio signal with respect to the particular audio signal, in a period specified by the process period specifying section as the silent period in the particular audio signal; and

an outputting section which superposes the second audio signal on the particular audio signal to output a resultant audio signal.

7. The audio signal processing system according to claim 3, wherein the audio signal generating section includes:

a frequency characteristic sensing section which senses frequency characteristic of the other audio signals; and

a similar characteristic signal generating section which generates the second audio signal having a frequency characteristic that is similar to the frequency characteristic sensed by the frequency characteristic sensing section and that has a low similarity to the frequency characteristic of the particular audio signal.

8. The audio signal processing system according to claim 3, wherein the audio signal generating section generates the second audio signal whose phase is opposite to phases of the other audio signals.

16. The audio signal processing system according to claim 3, wherein the process period specifying section includes:

a sound volume level sensing section which senses sound volume levels of the plurality of audio signals that are received by the receiving section; and

a specifying section which specifies a period during which the sound volume level that is sensed by the sound volume level sensing section is below a predetermined level continuously in excess of a predetermined time, as the silent period.

20. The audio signal processing system according to claim 3, wherein the process period specifying section has a specifying section which receives data indicating silent periods attached to the plurality of audio signals, and specifies the silent periods of the plurality of audio signals from the data.

4. An audio signal processing system, comprising:

a receiving section which receives a plurality of audio signals;

a process period specifying section which specifies a non-silent period in the plurality of audio signals that are received by the receiving section, respectively;

a sound volume level adjusting section which adjusts a sound volume level of the particular audio signal received by the receiving section to come close to a mean value of the sound volume levels of the plurality of audio signals, in a period specified by the process period specifying section as a non-silent period in all of the plurality of audio signals; and

an outputting section which outputs the particular audio signal whose sound volume level is adjusted by the sound volume level adjusting section.

10. The audio signal processing system according to claim 4, wherein the process period specifying section includes:

a sound volume level sensing section which senses sound volume levels of the plurality of audio signals that is received by the receiving section; and

a specifying section which specifies a period during which the sound volume level that is sensed by the sound volume level sensing section exceeds a predetermined level as the non-silent period.

12. The audio signal processing system according to claim 4, wherein the process period specifying section has a specifying section which receives data indicating non-silent periods attached to the plurality of audio signals, and specifies the non-silent periods of the plurality of audio signals from the data.

5. An audio signal processing system, comprising:

a receiving section which receives a plurality of audio signals;

a process period specifying section which specifies a non-silent period in the plurality of audio signals that are received by the receiving section, respectively;

a frequency characteristic correcting section which executes either a process of removing a predetermined frequency band component from the particular audio signal received by the receiving section or a process of correcting the particular audio signal into an audio signal having a frequency characteristic that is similar to the other audio signals except the particular audio signal received by the receiving section, in a period specified by the process period specifying section as the non-silent period in all of the plurality of audio signals; and

an outputting section which outputs the particular audio signal whose frequency characteristic is corrected by the frequency characteristic correcting section.

17. The audio signal processing system according to claim 5, wherein the process period specifying section includes:

a sound volume level sensing section which senses sound volume levels of the plurality of audio signals that is received by the receiving section; and

a specifying section which specifies a period during which the sound volume level that is sensed by the sound volume level sensing section exceeds a predetermined level as the non-silent period.

21. The audio signal processing system according to claim 5, wherein the process period specifying section has a specifying section which receives data indicating non-silent periods attached to the plurality of audio signals, and specifies the non-silent periods of the plurality of audio signals from the data.

6. An audio signal processing system, comprising:

a receiving section which receives a plurality of audio signals;

a process period specifying section which specifies a non-silent period in the plurality of audio signals that are received by the receiving section, respectively;

an audio signal generating section which generates a second audio signal to correspond to the particular audio signal that the receiving section received, in a period specified by the process period specifying section as the non-silent period in all of the plurality of audio signals; and

an outputting section which superposes the second audio signal on the particular audio signal to output a resultant audio signal.

13. The audio signal processing system according to claim 6, wherein the audio signal generating section includes:

a frequency characteristic sensing section which senses frequency characteristic of the other audio signals; and

a similar characteristic signal generating section which generates the second audio signal having a frequency characteristic that is similar to the frequency characteristic sensed by the frequency characteristic sensing section and that has a low similarity to the frequency characteristic of the particular audio signal.

14. The audio signal processing system according to claim 6, wherein the audio signal generating section generates the second audio signal whose phase is opposite to phases of the other audio signals.

18. The audio signal processing system according to claim 6, wherein the process period specifying section includes:

a sound volume level sensing section which senses sound volume levels of the plurality of audio signals that is received by the receiving section; and

a specifying section which specifies a period during which the sound volume level that is sensed by the sound volume level sensing section exceeds a predetermined level as the non-silent period.

22. The audio signal processing system according to claim 6, wherein the process period specifying section has a specifying section which receives data indicating non-silent periods attached to the plurality of audio signals, and specifies the non-silent periods of the plurality of audio signals from the data.