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Mixing system, method and program 新技術説明会

外国特許コード F110005497
整理番号 K07701WO
掲載日 2011年9月7日
出願国 アメリカ合衆国
出願番号 99315306
公報番号 20090034766
公報番号 8023659
出願日 平成18年6月20日(2006.6.20)
公報発行日 平成21年2月5日(2009.2.5)
公報発行日 平成23年9月20日(2011.9.20)
国際出願番号 JP2006312332
国際公開番号 WO2006137400
国際出願日 平成18年6月20日(2006.6.20)
国際公開日 平成18年12月28日(2006.12.28)
優先権データ
  • 特願2005-180772 (2005.6.21) JP
  • 2006WO-JP312332 (2006.6.20) WO
発明の名称 (英語) Mixing system, method and program 新技術説明会
発明の概要(英語) (US8023659)
In a situation where a plurality of virtual sound sources are fixedly located, a mixing system allows a listener to increase or decrease the sound volumes of the virtual sound sources with a simple operation.
Directional angle difference detection means 24 detects a directional angle difference between a predetermined reference directional angle and an indicated directional angle which is determined by the listener by pointing with an operation unit 7 a certain direction in a virtual space where the virtual sound sources exist.
Mixing means 5 mixes a plurality of audio signals supplied from a plurality of audio channels and outputs a mixed audio signal without adjustment, when the directional angle difference is zero degrees.
When the directional angle difference is other than zero degrees, the mixing means 5 creates a situation where the plurality of virtual sound sources are fixedly located with respect to the reference directional angle, and mixed the plurality of audio signals so that the sound volumes of one or more sound sources arranged in a direction of the indicated directional angle may be larger than those of the one or more sound sources at the time that the directional angle difference is zero degrees.
特許請求の範囲(英語) [claim1]
1. A mixing system comprising: mixing means for mixing a plurality of audio signals and outputting a mixed audio signal to a sound reproducing apparatus which produces a plurality of virtual sound sources around a listener, the plurality of audio signals being supplied from a plurality of audio signal channels respectively associated with the plurality of virtual sound sources;
an operation unit to be operated by the listener; and
directional angle difference detection means provided in the operation unit, for detecting a directional angle difference between a predetermined reference directional angle and an indicated directional angle which the listener determines by indicating with the operation unit a certain direction within a virtual sound source space where the plurality of virtual sound sources exist,
wherein the mixing means
mixes the plurality of audio signals supplied from the plurality of audio signal channels without adjustment and outputs the mixed audio signal when the directional angle difference is zero degrees; and
creates a state where the plurality of virtual sound sources are fixedly located with respect to the reference directional angle, and mixes the plurality of audio signals supplied from the plurality of audio signal channels by performing sound volume adjustment and phase adjustment for the audio signals so that the sound volumes of one or more of the virtual sound sources located in a direction determined by the indicated directional angle may be higher than those of the one or more virtual sound sources at the time that the directional angle difference is zero degrees, and outputs the mixed audio signal when the directional angle difference is other than zero degrees.
[claim2]
2. The mixing system according to claim 1, further comprising angle range setting means for setting a given directional angle range centering on the indicated directional angle, wherein the mixing means performs, when the directional angle range is set, the sound volume adjustment for the plurality of audio signals supplied from the plurality of audio signal channels so that the sound volumes of one or more of the virtual sound sources located within the directional angle range may be higher than those of the one or more of the virtual sound sources when the directional angle difference is zero degrees, and that the sound volumes of other virtual sound sources located out of the directional angle range may be lower than those of the one or more of the virtual sound sources located within the directional angle range.
[claim3]
3. The mixing system according to claim 2, wherein the mixing means includes: a channel selection section for calculating a directional angle difference between the indicated directional angle and each directional angle of the plurality of virtual sound sources, and selecting one or more of the audio signal channels respectively associated with one or more of the virtual sound sources located within the directional angle range based on the calculated directional angle differences when the directional angle range is set; and
a mixing section for performing the sound volume adjustment for the plurality of audio signals supplied from the plurality of audio signal channels so that the sound volumes of one or more of the audio signals supplied from the one or more of the audio signal channels which have been selected by the channel selection section may be higher than those of other audio signal channels which have not been selected.
[claim4]
4. The mixing system according to claim 2, wherein the operation unit includes a range-control switch, and the angle range setting means narrows the directional angle range when the range-control switch is operated in a closing direction, and expands the directional angle range when the range-control switch is operated in an opening direction.
[claim5]
5. The mixing system according to claim 1, further comprising elevation angle difference detection means for defining as a reference elevation angle an elevation angle of the operation unit when the reference directional angle is determined, and for detecting a difference between the reference elevation angle and an elevation angle of the operation unit as an elevation angle difference and for outputting the elevation angle difference, the elevation angle being a positive angle when the elevation angle is formed as the operation unit is directed upward from a posture with which the reference directional angle has been determined, and a negative angle when the elevation angle is formed as the operation unit is directed downward from the posture, wherein the mixing means performs the sound volume adjustment for the plurality of audio signals supplied from the plurality of audio signal channels respectively associated with the plurality of virtual sound sources located in a direction of the indicated directional angle so that, when the elevation angle difference detection means is outputting a positive elevation angle difference, the sound volumes of the plurality of virtual sound sources located in the direction of the indicated directional angle may be increased in proportion to the elevation angle difference, and when the elevation angle difference detection means is outputting a negative elevation angle difference, the sound volumes of the plurality of virtual sound sources located in the direction of the indicated directional angle may be decreased in proportion to the elevation angle difference.
[claim6]
6. The mixing system according to claim 4, wherein the operation unit is constituted from a headphone as a main unit component, which the listener wears on the head; and
the headphone is equipped with at least a directional angle detection sensor used for the directional angle difference detection means, an elevation angle detection sensor used for the elevation angle difference detection means, and an operation portion of the angle range setting means.
[claim7]
7. The mixing system according to claim 6, wherein the range-control switch is mounted onto an outside of at least one of left and right speakers of the headphone, and is operated toward the closing direction as the listener brings the hand close to the speaker, and is operated toward the opening direction automatically as the listener brings the hand away from the speaker.
[claim8]
8. The mixing system according to claim 2, wherein the operation unit is constituted from a remote controller as a main unit component, which the listener holds by hand for operation, and
the remote controller is equipped with at least a directional angle detection sensor used for the directional angle difference detection means, an elevation angle detection sensor used for the elevation angle difference detection means, and an operation portion of the angle range setting means.
[claim9]
9. The mixing system according to claim 8, wherein the directional angle detection sensor and the elevation angle detection sensor are constituted from an electronic compass.
[claim10]
10. A mixing method of mixing a plurality of audio signals and outputting a mixed audio signal to a sound reproducing apparatus which produces a plurality of virtual sound sources around a listener, the plurality of audio signals being supplied from a plurality of audio signal channels respectively associated with the plurality of virtual sound sources, the method comprising the steps of: preparing an operation unit to be operated by the listener;
detecting a directional angle difference between a predetermined reference directional angle and an indicated directional angle which the listener determines by indicating with the operation unit a certain direction within a virtual sound source space where the plurality of virtual sound sources exist;
mixing the plurality of audio signals supplied from the plurality of audio signal channels without adjustment and outputting the mixed audio signal when the directional angle difference is zero degrees; and creating a state where the plurality of virtual sound sources are fixedly located with respect to the reference directional angle, and mixing the plurality of audio signals supplied from the plurality of audio signal channels by performing sound volume adjustment and phase adjustment for the audio signals so that the sound volumes of one or more of the virtual sound sources located in a direction of the indicated directional angle may be higher than those of the one or more virtual sound sources at the time that the directional angle difference is zero degrees, and outputting the mixed audio signal when the directional angle difference is other than zero degrees.
[claim11]
11. The mixing method according to claim 10, further comprising the step of setting a given directional angle range centering on the indicated directional angle, wherein in the step of mixing, when the directional angle range is set, the sound volume adjustment for the plurality of audio signals supplied from the plurality of audio signal channels is performed so that the sound volumes of one or more of the virtual sound sources located within the directional angle range may be higher than those of the one or more of the virtual sound sources when the directional angle difference is zero degrees, and that the sound volumes of other virtual sound sources located out of the directional angle range may be lower than those of the one or more of the virtual sound sources located within the directional angle range.
[claim12]
12. The mixing method according to claim 10, further comprising the step of defining as a reference elevation angle an elevation angle of the operation unit when the reference directional angle is determined, detecting a difference between the reference elevation angle and an elevation angle of the operation unit as an elevation angle difference, and outputting the elevation angle difference, the elevation angle being a positive angle when the elevation angle is formed as the operation unit is directed upward from a posture with which the reference directional angle has been determined, and a negative angle when the elevation angle is formed as the operation unit is directed downward from the posture, wherein in the step of mixing, the sound volume adjustment is performed for the plurality of audio signals supplied from the plurality of audio signal channels respectively associated with the plurality of virtual sound sources located in a direction of the indicated directional angle so that, when a positive elevation angle difference is being detected, the sound volumes of the plurality of virtual sound sources located in the direction of the indicated directional angle may be increased in proportion to the elevation angle difference, and when a negative elevation angle difference is being detected, the sound volume of the plurality of virtual sound sources located in the direction of the indicated directional angle may be decreased in proportion to the elevation angle difference.
[claim13]
13. A computer program for mixing a plurality of audio signals and outputting a mixed audio signal to a sound reproducing apparatus which produces a plurality of virtual sound sources around a listener, the plurality of audio signals being supplied from a plurality of audio signal channels respectively associated with the plurality of virtual sound sources, the program causing a computer to perform the steps of: detecting a directional angle difference between a predetermined reference directional angle and an indicated directional angle which the listener determines by indicating with an operation unit a certain direction within a virtual sound source space where the plurality of virtual sound sources exist;
setting a given directional angle range centering on the indicated directional angle;
defining as a reference elevation angle an elevation angle of the operation unit when the reference directional angle is determined, detecting a difference between the reference elevation angle and an elevation angle of the operation unit as an elevation angle difference, and outputting the elevation angle difference, the elevation angle being a positive angle when the elevation angle is formed as the operation unit is directed upward from a posture with which the reference directional angle has been determined, and a negative angle when the elevation angle is formed as the operation unit is directed downward from the posture; and
mixing the plurality of audio signals supplied from the plurality of audio signal channels without adjustment and outputting the mixed audio signal when the directional angle difference is zero degrees; and
creating a state where the plurality of virtual sound sources are fixedly located with respect to the reference directional angle, and mixing the plurality of audio signals supplied from the plurality of audio signal channels by performing sound volume adjustment and phase adjustment for the audio signals so that the sound volumes of one or more of the virtual sound sources located in a direction of the indicated directional angle may be higher than those of the one or more virtual sound sources at the time that the directional angle difference is zero degrees, and outputting the mixed audio signal when the directional angle difference is other than zero degrees, and by performing the sound volume adjustment for the plurality of audio signals supplied from the plurality of audio signal channels, when the directional angle range is set, so that the sound volumes of one or more of the virtual sound sources located within the directional angle range may be higher than those of the one or more of the virtual sound sources when the directional angle difference is zero degrees, and that the sound volumes of other virtual sound sources located out of the directional angle range may be lower than those of the one or more of the virtual sound sources located within the directional angle range, and by performing the sound volume adjustment for the plurality of audio signals supplied from the plurality of audio signal channels respectively associated with the plurality of virtual sound sources located in a direction of the indicated directional angle so that, when a positive elevation angle difference is being detected, the sound volumes of the plurality of virtual sound sources located in the direction of the indicated directional angle may be increased in proportion to the elevation angle difference, and when a negative elevation angle difference is being detected, the sound volumes of the plurality of virtual sound sources located in the direction of the indicated directional angle may be decreased in proportion to the elevation angle difference.
  • 発明者/出願人(英語)
  • HAMANAKA MASATOSHI
  • IKETUKI YUUYA
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
参考情報 (研究プロジェクト等) PRESTO Foundation of technology supporting the creation of digital media contents AREA
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