JP2006160160A - Operating environmental sound adjusting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the safety in driving a vehicle by transmitting certainly to the driver extra-vehicle sounds required to perform driving, in particular the sound necessary for acknowledging the hazardous situation, without emitting a larger volume than necessary. <P>SOLUTION: The waveforms of the different pieces of sound data of the extra-vehicle sounds A1 and intra-vehicle sounds A2 collected by an extra-vehicle sound collecting device 11 and an intra-vehicle sound collecting device 12 are superposed on the original voice waveform upon converting so that the phase of each piece of sound data is inverted 180 degrees. with respect to the original voice waveform in the place corresponding to the coordinates information of the driver's ears entered from a driver position locating device 13, and the volume ratios of the extra-vehicle sound to intra-vehicle sound are adjusted to optimum by subjecting the amplitude of each piece of sound data converted to a volume adjustment. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention enables the driver to reliably hear sounds necessary for confirming the surrounding dangerous situation while the vehicle is running, such as a crossing sound, a crossing signal sound, a vehicle sound and a horn sound traveling around the vehicle. The present invention relates to a driving environment sound adjusting device that adjusts driving environment sounds.

  In recent years, in the automobile industry, various safety functions such as an air bag and a rear-view camera have begun to be installed in order to protect the safety of drivers and passengers. In addition, in order to assist the driver to drive safely, an automatic driving system, a dozing detection / alarm generation system, and the like are gradually realized.

  When driving a car, the driver receives a sound in a state where sound including information necessary for driving and sound not related to driving are mixed. For the driver, the sound necessary for driving arrives from outside the vehicle, and the sound inside the vehicle is generally unnecessary for driving itself. Therefore, if the sound or sound inside the vehicle is louder than the sound outside the vehicle, the driver often cannot obtain important information.

As a volume adjustment method, for example, Patent Document 1 discloses an in-vehicle volume that adjusts the volume of a radio or the like by recognizing a driver and a passenger and referring to personal information such as a personal hearing ability stored in advance. An adjustment device is disclosed.
Japanese Patent Laid-Open No. 2001-60095

  However, since the conventional technique disclosed in Patent Document 1 is intended to adjust the volume of a radio or the like inside the vehicle, the sound generated outside the vehicle is handled as noise. For this reason, when a dangerous situation occurs, for example, a crossing sound, a crossing signal sound, a surrounding traveling vehicle sound, and a horn sound, there is a risk to driving that these driving environment sounds are not recognized by the driver.

  The present invention solves the above-mentioned conventional problems. When driving a vehicle, the driving environment sound outside the vehicle necessary for driving, in particular, the sound necessary for recognizing a dangerous situation is louder than necessary. It is an object of the present invention to provide a driving environment sound adjusting device that can improve the safety during driving of a vehicle by reliably delivering the sound to the driver without emitting a noise and also delivering the sound in the vehicle to the driver.

  The driving environment sound adjusting device according to the present invention includes an outside sound collecting means for collecting outside sound, an inside sound collecting means for collecting inside sound, a driver position specifying means for specifying a driver's ear position, and the outside collection. Sound synthesizing means for adjusting the sound volume and the vehicle exterior sound and the vehicle interior sound collected by the vehicle sound collecting means to respective volume ratios corresponding to the driver's ear position information from the driver position specifying means, and the sound synthesizing means And a sound output means for outputting the sound synthesized at the ear position of the driver, thereby achieving the above object.

  Preferably, the sound synthesizing means in the driving environment sound adjusting device according to the present invention is configured such that the collected sound outside the vehicle and the sound inside the vehicle have a phase of 180 degrees of each sound data at a location corresponding to the ear position information of the driver. The sound volume ratio between the outside sound and the inside sound is adjusted by converting the sound data to be inverted and adjusting the amplitude of each sound data to be converted.

  Further preferably, the vehicle exterior sound collection means and the vehicle interior sound collection means in the driving environment sound adjusting device of the present invention are respectively provided with a right sound collection means provided on the right side of the vehicle with respect to the driver, Left-side sound collecting means provided on the left side, and the sound synthesizing means corresponds to the information on the binaural positions of the driver from the driver position specifying means, respectively, Adjust each volume ratio.

  Further preferably, for the sound synthesis means in the driving environment sound adjusting device of the present invention, each volume ratio of at least one of the volume ratios of the outside sound and the interior sound and the volume ratios of the right and left sounds. Is further provided with a sound volume ratio specifying means.

  Further preferably, the sound synthesizing means in the driving environment sound adjusting device of the present invention synthesizes the sound so as to cancel out the in-vehicle sound and emphasize the out-of-vehicle sound out of the out-of-vehicle sound and the in-vehicle sound.

  Further preferably, the sound synthesizing means in the driving environment sound adjusting device of the present invention can adjust the position and directionality of the sound source by adjusting the volume ratio of the right and left sounds.

  Further preferably, the sound output means in the driving environment sound adjusting device of the present invention includes a right ear sound output means arranged on the driver right ear side to output sound for the right ear to the driver right ear, and the driver left A left ear sound output means disposed on the ear side for outputting a left ear sound to the driver's left ear;

  Further preferably, the sound output means for the right ear in the driving environment sound adjusting device of the present invention outputs a sound for the right ear based on a sound signal from the sound collecting means for the right side, and the sound output means for the left ear Outputs sound for the left ear using the sound signal from the left sound collecting means.

  Further preferably, the right-ear sound output means and the left-ear sound output means in the driving environment sound adjusting device of the present invention are each a speaker having directivity.

  Further preferably, the driver position specifying means in the driving environment sound adjusting device of the present invention comprises: light emitting means for emitting light to the front face of the driver; camera means for imaging the front face of the driver; and the camera A coordinate calculation unit that calculates the position coordinates of both ears from the imaging information of the front face of the driver imaged by the unit, and a coordinate output unit that outputs the coordinate information calculated by the coordinate calculation unit to the sound synthesis unit.

  Further preferably, the light emitting means in the operating environment sound adjusting device of the present invention is a light emitting element that emits invisible near-infrared light.

  Further preferably, the camera means in the driving environment sound adjusting device of the present invention images light reflected by both eyes of the driver as two adjacent light spots on the captured image.

  Further preferably, the coordinate calculation means in the driving environment sound adjusting device of the present invention calculates the position coordinates of the driver's binaural from the driver's binocular position of the driver's binocular reflected light on the image taken by the camera means.

  Further preferably, the coordinate calculation means in the driving environment sound adjusting device of the present invention searches for the contour of the driver's front face from the captured image captured by the camera means, and based on the contour of the driver's front face, Calculate location information.

  Further preferably, the driver position specifying means in the driving environment sound adjusting device of the present invention is configured to determine the positions of both ears of the transmission source from the transmitters respectively disposed on both ears of the driver and the radio waves transmitted from the transmitters. Coordinate calculation means for calculating, and coordinate output means for outputting the coordinate information calculated by the coordinate calculation means to the sound synthesis means.

  With the above configuration, the operation of the present invention will be described below.

  In the driving environment sound adjusting device of the present invention, the outside sound collecting means collects outside sound that can be heard by the driver if the inside of the vehicle is quiet, converts the sound to a sound signal, and outputs the sound signal to the sound synthesizing means. The in-vehicle sound collecting unit collects the sound in the vehicle, converts it into a sound signal, and outputs it to the sound synthesizing unit. Furthermore, the driver position specifying device specifies the position information (coordinates) of the driver's ear and outputs this to the sound synthesis means.

  For example, near infrared light is emitted from the near infrared light emitting means installed near the front of the driver toward the front of the driver's face, and the reflected light reflected by the driver's eyes is imaged by the camera means. . Since this reflected light appears as two adjacent points that shine on the captured image of the camera unit, the coordinate calculation unit detects two adjacent points that shine from the captured image as the positions of both eyes of the driver, It is possible to calculate the position of both ears of the driver from the detected position of both eyes.

  The sound synthesizing means converts the original sounds collected by the outside sound collecting means and the inside sound collecting means to the phase of each sound data at a location corresponding to the position information of both ears of the driver inputted from the driver position specifying device. Can be inverted 180 degrees and the amplitude of each converted sound data can be adjusted to adjust the volume ratios outside and inside the vehicle. For example, when it is desired to reduce the volume, the amplitude of the sound that reaches the ear can be reduced by inverting the phase of the adjusted output sound by 180 ° with respect to the phase of the original sound. Further, when it is desired to completely cancel the original sound, the phase of the adjusted output sound and the original sound (original sound) are made the same and the phase is inverted by 180 °. Furthermore, when it is desired to increase the volume, the phase of the adjusted output sound may be inverted by 180 ° with respect to the phase of the original sound to increase the amplitude of the sound that reaches the ear.

  The speaker as the sound output means has directivity and outputs sound data to the driver. For example, by providing a right-ear speaker and a left-ear speaker and placing them near the driver's ear, the volume adjustment effect only affects the driver, and other passengers can hear the sound that is not normal It becomes possible.

  Furthermore, an outside sound collecting means and an inside sound collecting means are provided on the left and right sides of the vehicle, respectively, and the sound from the right sound collecting means is output from the right ear speaker, and the sound from the left sound collecting means is used for the left ear. By outputting from the speaker, the position and direction of the sound source can be confirmed.

  As described above, according to the present invention, the volume ratio of the vehicle exterior sound and the vehicle interior sound is adjusted and output to the driver. For example, by setting the volume ratio of the vehicle exterior sound higher than the volume ratio of the vehicle interior sound, The driving environment sounds of the sound, in particular, various environmental sounds for recognizing dangerous situations such as crossing sounds, crossing signal sounds, surrounding traveling vehicle sounds and horn sounds, etc. are surely secured to the driver without making the volume louder than necessary. And the sound inside the vehicle is also delivered to the driver as necessary, so that safety during driving can be improved.

  Hereinafter, an embodiment of a vehicle environmental sound adjusting device of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram illustrating a configuration example of a main part of a vehicle environmental sound adjustment device according to an embodiment of the present invention. Here, the solid arrow represents an electric signal, and the dotted arrow represents sound or light.

  In FIG. 1, a vehicle environmental sound adjusting device 10 includes an outside sound collecting device 11 as an outside sound collecting unit for collecting outside sound, an in-vehicle sound collecting device 12 as an inside sound collecting unit for collecting inside sound, A driver position specifying device 13 as a driver position specifying means for specifying the position of the driver, a sound synthesizer 14 as a sound synthesizing means for synthesizing a sound outside the vehicle and a sound inside the vehicle according to the position of the driver, and the synthesized sound Speakers 15a and 15b are provided as sound output means having directivity for output.

  The vehicle outside sound collector 11 collects the vehicle outside sound A1 and converts it into a sound signal, which is then output to the sound synthesizer 14.

  The vehicle interior sound collector 12 collects the vehicle interior sound A2 and converts it into a sound signal, which is then output to the sound synthesizer 14. Note that the sound inside and outside the vehicle includes horns, conversations, music, noise, and the like, and sounds useful and unnecessary for the driver are mixed, so the sound collecting device 11 outside the vehicle and the sound collecting device 12 inside the vehicle. May have a function of enhancing sounds such as human voice, siren, and horn, and a function of canceling noise. A specific method for realizing such a sound collecting device is described in detail, for example, in Japanese Patent Application No. Hei 5-231468 “Sound Output Circuit”, and the description thereof is omitted here.

  The driver position specifying device 13 specifies the position coordinates of both ears of the driver and outputs the specified position coordinates to the sound synthesizer 14. The driver position specifying device 13 can be realized in various ways. For example, a near-infrared light emitting diode (LED) 13a as a light emitting means for emitting invisible near-infrared light, a driver's face. Coordinate calculation as a camera 13b as a camera means for imaging near-infrared light reflected by both eyes while imaging the front, and a coordinate calculation means for calculating the position coordinates of both ears from the positions of both eyes of the imaged driver. And a coordinate output unit 13d as coordinate output means for outputting the calculation result (coordinate information of both ears) to the sound synthesizer 14.

  In the driver position specifying device 13, a near infrared LED 13a installed near the front of the driver emits light toward the driver. Since the near-infrared light from the near-infrared LED 13a is invisible light, the front of the driver can be irradiated without diverting the driver's attention. The light from the near-infrared light LED 13a irradiated to the driver is reflected by the driver's eyes (fundus) (application of the red-eye phenomenon). When a person's face is normally imaged, an image as shown in FIG. 2A is obtained, but it is placed in front of the driver's face by irradiating near infrared light from the near infrared LED 13a. As shown in FIG. 2B, the image picked up with the aperture of the camera 13b appears as two adjacent illuminated points of the eye (black eye). Using this image information (image signal), the coordinate computing unit 13c identifies two adjacent illuminated points as eyes from the image, calculates the position coordinates of both ears of the driver from the position of the eyes, and calculates the calculation. The result (coordinate information) is output from the coordinate output unit 13d to the sound synthesizer 14.

  The near-infrared light LED 13a emits invisible light and preferably does not emit visible light. When emitting visible light, the near-infrared light LED 13a attenuates the visible light so that it is not recognized by the driver. It is preferable to cover the light emitting source with a filter that does not transmit visible light. In addition, the near-infrared light LED 13a may be installed side by side when a single LED cannot provide sufficient illuminance.

  The sound synthesizer 14 has a function of internally converting sound signals and outputting them from the speakers 15a and 15b. The sound synthesizer 14 corresponds to the coordinate information of both ears of the driver inputted from the driver position specifying device 13 with the original sounds (original sounds) collected by the outside sound collecting device 11 and the inside sound collecting device 12. The sound data is converted so that the phase of each sound data is inverted by 180 degrees at the place where the sound is to be transmitted, and the volume ratio between the sound outside the vehicle and the sound inside the vehicle is adjusted as appropriate by adjusting the amplitude of the sound data to be converted. Sound signals are output to 15a and 15b, respectively. At this time, a plurality of types of volume ratios may be determined in advance and selectively used, and a volume ratio designating unit (not shown) that enables input of the volume ratio from the outside can be provided.

  FIG. 3A is a side view schematically showing an installation example of components that perform each process in the vehicle environmental sound adjusting device 10 of the present embodiment, and FIG. 3B is a plan view thereof.

  As shown in FIGS. 3 (a) and 3 (b), an outside sound collecting device 11a is provided on the right side outside the vehicle, and an inside sound collecting device 12a as in-vehicle sound collecting means for the right side is provided on the right side of the driver inside the vehicle. A vehicle outside sound collecting device 11b is provided on the left side outside the vehicle, and a vehicle inside sound collecting device 12b is provided on the left side of the driver inside the vehicle as left side vehicle sound collecting means. The sounds A1 and A2 collected by the outside sound collecting device 11a and the inside sound collecting device 12a are sounded as sound B1 from the sound synthesizing device 14 to the right ear of the driver through the speaker 15a as right sound output means. The sounds A1 and A2 that are output and collected by the outside sound collecting device 11b and the inside sound collecting device 12b are output from the speaker 15b as sound output means for the left ear via the sound synthesizer 14 to the left ear of the driver (driver). Is output as sound B2. With this configuration, it is possible to let the driver hear the sound after adjusting the volume and sound output position without impairing the directionality of the sound source.

  In the present embodiment, as shown in FIG. 3, two speakers 15a and 15b are provided. The speaker 15a is arranged near the right ear of the driver and outputs sound data to the right ear as a speaker. 15b is arranged near the driver's left ear and outputs sound data to the left ear. With this configuration, it is possible to suppress the diffusion of sound emitted from the speakers 15a and 15b. Also, by providing the speakers 15a and 15b with directivity, only necessary sounds reach only the driver. It is possible to prevent the sound from 15b from reaching the passenger so as not to affect the passenger's conversation and radio listening.

  Furthermore, in this embodiment, as shown in FIG. 3, the camera 13b is installed on the attic (ceiling side) of the vehicle body in front of the driver so as to face the front face of the driver. With this configuration, it is possible to photograph the vicinity of the face in front of the driver and specify the positions of the eyes and ears.

  Furthermore, according to the present embodiment, by specifying the position of the driver and outputting sound from the speakers 15a and 15b as sound, the earphone is not required (cordless), and the degree of freedom of the driver's operation during driving can be increased. it can.

  Furthermore, according to the present embodiment, it is possible to cancel the sound heard by the driver's ear and adjust the volume by inverting the phase of various sounds collected from inside and outside the vehicle and synthesizing the sound, which is necessary for driving. In-vehicle conversation and radio viewing can be established while ensuring sound information.

  FIG. 4 shows the relationship between the original sound waveform and the sound waveform after sound adjustment by the sound synthesizer 14. Here, the horizontal axis indicates time, and the vertical axis indicates amplitude.

  4 (a) shows the waveform of the original sound, and FIG. 4 (b) shows the time lag (time difference correction time t1-t0 until the sound actually reaches the driver's ear) in order to cancel it. The waveform is inverted. In order to cancel the original sound, it is necessary to invert 180 degrees from the original waveform and set the amplitude to be the same as the original sound.

  FIG. 4C shows an example of a waveform when the original sound is weakened, and FIG. 4D shows an example of a waveform when the original sound is strengthened. In order to weaken the original sound, the amplitude is set smaller than the original sound by inverting 180 degrees from the original waveform. When the original sound is strengthened, the amplitude is set to at least twice the original sound by reversing the original waveform by 180 degrees.

  FIG. 4 (e) shows a waveform when the sound entering the driver's ear is strengthened using the waveform of FIG. 4 (d). The broken line is the original sound and the waveform in FIG. 4D, and the solid line is the waveform strengthened by the waveform in FIG.

  Here, the attenuation of the sound from the collected location to the driver's ears is not taken into account, but it is easy to output a waveform that takes into account the attenuation.

  As described above, according to the present embodiment, the waveforms of the sound data of the outside sound A1 and the inside sound A2 collected by the outside sound collecting device 11 and the inside sound collecting device 12 are input from the driver position specifying device 13, respectively. In the place corresponding to the coordinate information of the driver's both ears, each sound data is converted so that the phase is inverted by 180 degrees with respect to the original sound waveform and superimposed on the original sound waveform, and each converted sound By adjusting the volume of the data amplitude, it is possible to optimally adjust the volume ratio of the sound outside the vehicle and the sound inside the vehicle. In this case, when the volume is reduced, the phase is inverted by 180 ° to reduce the amplitude, when the original sound is completely canceled, the amplitude is the same and the phase is inverted by 180 °, and when the volume is increased, the phase is increased. Is rotated 180 ° to increase the amplitude. Further, the speakers 15a and 15b having directivity can be arranged near the driver's ears to output the sounds B1 and B2 to the driver. For example, by setting the volume ratio of outside sound higher than the volume ratio of inside sound, it recognizes dangerous situations such as outside sound, especially sound of crossing and crossing signals, horn sound generated by vehicles traveling around. Therefore, it is possible to improve the safety when driving a car by reliably delivering various environmental sounds to the driver without generating louder sound than necessary and also delivering the in-vehicle sound to the driver to the minimum necessary. Therefore, it is possible to improve the safety when driving the vehicle by reliably delivering to the driver the sound outside the vehicle necessary for driving, especially the sound necessary for recognizing the dangerous situation, without producing a louder sound than necessary. .

  In this embodiment, as the driver position specifying device 13, the configuration example in which the coordinate position of both ears is calculated by the camera 13b, the near infrared light LED 13a, the coordinate calculator 13c, and the coordinate output unit 13d is shown. It is also possible to use the binaural position calculation method, for example, to find the contour of the front face in the image and calculate the position of both ears, or attach the transmitter to the driver and the ears from the radio waves oscillated from the transmitter In the present invention, such as a method for calculating the position of both ears, any position calculation method for both ears may be used.

  Further, in the present embodiment, in-vehicle sound collecting device 11 and in-vehicle sound collecting device 12 are provided on each of the left and right in order to take into account the direction of the sound source. Furthermore, more sounds may be installed (a plurality of vehicle sound collectors 11 and a plurality of vehicle sound collectors 12 are installed at a plurality of positions) so that the sound can be accurately reproduced.

  As mentioned above, although this invention has been illustrated using preferable embodiment of this invention, this invention should not be limited and limited to this embodiment. It is understood that the scope of the present invention should be construed only by the claims. It is understood that those skilled in the art can implement an equivalent range based on the description of the present invention and the common general technical knowledge from the description of specific preferred embodiments of the present invention. Patents, patent applications, and documents cited herein should be incorporated by reference in their entirety, as if the contents themselves were specifically described herein. Understood.

  In the field of vehicle-mounted devices that are mounted on vehicles such as automobiles, trucks, and even trains in order to protect the safety of drivers and passengers, the present invention adjusts the volume ratio of outside sound and inside sound of the driver. It is possible to optimize the sound input to both ears, and various environments necessary for checking the danger situation of the surroundings while driving the vehicle, such as crossing sound, crossing signal sound, horn sound generated by the vehicle traveling around The volume can be adjusted so that the driver can hear the sound reliably, and the safety when driving the vehicle can be further enhanced.

It is a block diagram which shows the principal part structural example of the vehicle environmental sound adjustment apparatus which concerns on embodiment of this invention. It is a conceptual diagram for demonstrating extraction of the binocular position using a red eye, (a) is a figure which shows the example of an image at the time of imaging a person's face normally from the front, (b) is LED It is a figure which shows the example of an image at the time of irradiating the near-infrared light from to the face front, and narrowing down the aperture of the camera installed in front of the face. (A) is the side view which shows typically the installation example of the structural member which performs each process in the vehicle environmental sound adjustment apparatus of this embodiment, (b) is the top view. It is a waveform diagram showing the relationship between the waveform of the original sound and the waveform after sound adjustment by the sound synthesizer, (a) is a waveform diagram showing the waveform of the original sound, (b) is for canceling the original sound (C) is a waveform diagram showing a waveform example when the original sound is weakened, (d) is a waveform diagram showing a waveform example when the original sound is strengthened, (e) FIG. 6 is a waveform diagram showing an example of a waveform when a sound entering a driver's ear is strengthened using the waveform of (d).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle environmental sound adjustment device 11, 11a, 11b Outside-vehicle sound collection device 12, 12a, 12b In-vehicle sound collection device 13D Liver position specification device 13a Near-infrared light LED
13b Camera 13c Coordinate calculator 13d Coordinate output unit 14 Sound synthesizer 15a, 15b Speaker A1, A2 Sound emitted from sound source B1, B2 Sound adjusted by the present invention

Claims (15)

Vehicle sound collecting means for collecting sound outside the vehicle;
In-vehicle sound collection means for collecting in-vehicle sound,
A driver position specifying means for specifying a driver's ear position;
Sound synthesizing means for adjusting the outside sound and the inside sound collected by the outside sound collecting means and the inside sound collecting means to respective volume ratios corresponding to the ear position information of the driver from the driver position specifying means;
A driving environment sound adjusting device having sound output means for outputting the sound synthesized by the sound synthesis means to the ear position of the driver.   The sound synthesizer converts the collected outside sound and in-vehicle sound so that the phase of each sound data is inverted by 180 degrees at a location corresponding to the driver's ear position information, and each sound to be converted The driving environment sound adjusting device according to claim 1, wherein the volume ratio of the outside sound and the inside sound is adjusted by adjusting an amplitude of data. Each of the outside sound collecting means and the inside sound collecting means has a right sound collecting means provided on the right side of the vehicle and a left sound collecting means provided on the left side of the vehicle with respect to the driver. And
3. The sound synthesis unit according to claim 1, wherein the sound synthesis unit adjusts the collected sounds on the right side and the left side to respective volume ratios corresponding to the binaural position information of the driver from the driver position specifying unit. Driving environment sound adjustment device.   And further comprising a volume ratio designating unit that allows the sound synthesizing unit to designate at least one of the volume ratios of the outside and in-vehicle sounds and the right and left volume ratios. The driving environment sound adjusting device according to any one of Items 1 to 3.   5. The driving environment sound adjusting device according to claim 2, wherein the sound synthesizing unit synthesizes the sound so as to cancel out the vehicle interior sound and emphasize the vehicle exterior sound out of the vehicle exterior sound and the vehicle interior sound.   5. The driving environment sound adjustment device according to claim 3, wherein the sound synthesis unit is capable of adjusting a position and directionality of a sound source by adjusting a volume ratio of the right and left sounds.   The sound output means is disposed on the right ear side of the driver and outputs sound for the right ear to the right ear of the driver, and the sound output means for right ear is disposed on the driver left ear side of the left ear to the driver left ear. The driving environment sound adjusting device according to claim 1, further comprising left ear sound output means for performing sound output for a vehicle.   The right ear sound output means outputs sound for the right ear based on the sound signal from the right sound collection means, and the left ear sound output means outputs the sound signal from the left sound collection means. The driving environment sound adjusting device according to claim 7, wherein the sound is output for the left ear.   The driving environment sound adjusting device according to claim 7 or 8, wherein each of the right ear sound output means and the left ear sound output means is a directional speaker.   The driver position specifying means includes both a light emitting means for emitting light to the front face of the driver, a camera means for taking an image of the front face of the driver, and imaging information of the front face of the driver taken by the camera means. The driving environment sound adjusting device according to claim 1, further comprising coordinate calculation means for calculating ear position coordinates and coordinate output means for outputting coordinate information calculated by the coordinate calculation means to the sound synthesis means.   The driving environment sound adjusting device according to claim 10, wherein the light-emitting means is a light-emitting element that emits invisible near-infrared light.   The driving environment sound adjusting device according to claim 10 or 11, wherein the camera means images light reflected by both eyes of the driver as two adjacent light spots on the captured image.   The driving environment sound adjustment device according to any one of claims 10 to 12, wherein the coordinate calculation means calculates position coordinates of a driver's binaural from a driver's binocular position of reflected light of the driver's binocular on an image captured by the camera means. .   The coordinate calculation means finds the outline of the driver's front face from the captured image taken by the camera means, and calculates position information of the driver's ears based on the outline of the driver's front face. The driving environment sound adjusting device according to 1.   The driver position specifying means includes a transmitter disposed in each ear of the driver, a coordinate calculation means for calculating the position of both ears of the transmission source from radio waves transmitted from the transmitter, and calculated by the coordinate calculation means. The driving environment sound adjusting device according to claim 1, further comprising coordinate output means for outputting the coordinate information to the sound synthesizing means.

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