Apparatus for stereophonic sound positioning
First Claim
1. A vehicular stereophonic sound apparatus for presenting an object condition of an object based on sensor information that is representative of an in-and-about condition of a vehicle and for outputting notification sound from a virtual sound source toward an occupant of the vehicle, the apparatus comprising:
- a right and a left main-speakers installed respectively equidistantly on a right side and a left side relative to a right ear and a left ear of the occupant;
a sub-speaker installed on a right-front position of the occupant;
a control unit for outputting a control signal for generating virtual sound based on determination of the object condition to be presented for the occupant according to the sensor information;
a positioning unit for positioning a sound image of the object in an actual direction by performing, for a right and a left audio signals respectively directed to the right and the left main-speakers, signal processing that utilizes Head-Related Transfer Function that reflects a position of the object based on the control signal from the control unit;
an enhance unit for enhancing the sound image by performing, for the right and the left audio signals respectively directed to the right and the left main-speakers, signal processing according to the position of the object;
a delay unit for correcting a difference of sound arrival times to the right and the left ears due to a difference of speaker-to-ear distances between the right and left main-speakers and the sub-speakers relative to the right and the left ears based on the control signal from the control unit according to the actual direction of the object;
a filter unit for processing the audio signal directed to the sub-speaker based on the control signal from the control unit according to the actual direction of the object; and
a volume adjustment unit for adjusting sound volume of the right and the left main-speakers and the sub-speaker independently based on the control signal from the control unit according to the actual direction and a distance of the object.
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Accused Products
Abstract
A stereophonic apparatus uses three speakers respectively installed toward a front of a vehicle on both shoulders of a seat back of a driver'"'"'s seat and toward a back of the vehicle on an exact center in front of a driver. This configuration provides more effectively exerted positioning effects for a virtual sound source realized by using the three speakers, especially for the effects in a frontward field of sound.
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Citations
9 Claims
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1. A vehicular stereophonic sound apparatus for presenting an object condition of an object based on sensor information that is representative of an in-and-about condition of a vehicle and for outputting notification sound from a virtual sound source toward an occupant of the vehicle, the apparatus comprising:
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a right and a left main-speakers installed respectively equidistantly on a right side and a left side relative to a right ear and a left ear of the occupant; a sub-speaker installed on a right-front position of the occupant; a control unit for outputting a control signal for generating virtual sound based on determination of the object condition to be presented for the occupant according to the sensor information; a positioning unit for positioning a sound image of the object in an actual direction by performing, for a right and a left audio signals respectively directed to the right and the left main-speakers, signal processing that utilizes Head-Related Transfer Function that reflects a position of the object based on the control signal from the control unit; an enhance unit for enhancing the sound image by performing, for the right and the left audio signals respectively directed to the right and the left main-speakers, signal processing according to the position of the object; a delay unit for correcting a difference of sound arrival times to the right and the left ears due to a difference of speaker-to-ear distances between the right and left main-speakers and the sub-speakers relative to the right and the left ears based on the control signal from the control unit according to the actual direction of the object; a filter unit for processing the audio signal directed to the sub-speaker based on the control signal from the control unit according to the actual direction of the object; and a volume adjustment unit for adjusting sound volume of the right and the left main-speakers and the sub-speaker independently based on the control signal from the control unit according to the actual direction and a distance of the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification