JP2010145906A - On-vehicle display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle display device which is mounted with a microphone for voice input and can keep the quality of a picked-up voice constant regardless of the angle of a display. <P>SOLUTION: The on-vehicle display device has the microphone 3 whose direction can be changed in a display unit 2, and includes an angle detecting unit 7 which detects the angle of the display unit 2, a voicing direction specifying unit 5 which specifies a speaker position based upon a voice signal input from the microphone 3, and a microphone driving unit 4 which controls the direction of the microphone 3 to a direction aiming at the detected speaker position. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an in-vehicle display device in which a microphone is mounted on a display device.

In recent years, speech recognition technology has been remarkably developed and used in various fields. For example, in-vehicle navigation devices have been able to input voices for operations such as destination setting and screen switching. In such a navigation device, it is necessary to install the voice input microphone in the vehicle interior so as to collect the driver's voice well and minimize the influence of noise in the vehicle interior so as not to disturb the driver's view. There is. For this reason, there is a voice recognition device that can identify the direction of the speaker by attaching a plurality of microphones to the sun visor and can accurately identify the direction of the speaker and recognize the voice even when the direction of the sun visor changes ( Patent Document 1).
JP 2003-44092 A

  However, when a plurality of microphones are installed in the sun visor, it is necessary to detect complicated processing for obtaining a phase difference from detected speech, processing for specifying a speaker direction, height of a headrest, and the like.

  Therefore, the present invention has been made to solve the conventional problems, and a speech recognition device that collects speech uttered by a speaker and recognizes it without calculating a phase difference of detected speech. The purpose is to provide.

  The in-vehicle display device of the present invention includes a display unit, a display angle detection unit that detects a display angle of the display unit, a sound collection unit that is installed in the display unit and collects external sounds, and a direction of the sound collection unit The sound collection direction drive unit for changing the sound collection direction, the sound generation direction specifying unit for specifying the sound generation direction from the sound detected by the sound collection unit and the display angle detected by the display angle detection unit, and the sound generation And a drive control unit that controls the sound collection direction drive unit from the sound generation direction specified by the direction specifying unit.

  According to the in-vehicle display device of the present invention configured as described above, the sound collection is performed so that the display angle of the display unit is detected by the display angle detection unit and the sound collected by the sound collection unit is collected to the maximum. The direction of the sound collecting unit is controlled by the sound collecting direction driving unit, so the direction of the sound collecting unit is automatically changed to the direction of the voice emitted from the speaker without being affected by the angle of the display unit. Can be collected in an optimal state.

  The vehicle-mounted display device of the present invention further includes a voice recognition unit that recognizes the voice detected by the sound collection unit, and controls the operation based on a voice instruction of a recognition result recognized by the voice recognition unit. It is comprised with the part.

  According to the in-vehicle display device of the present invention configured as described above, the voice recognition unit performs voice recognition from the voice detected by the sound collection unit, and the operation control unit performs the voice recognition recognized by the voice recognition unit. The operation of the in-vehicle display device can be controlled. Here, the operation control unit can change a television channel, navigation operation, music or radio selection of a music device, volume adjustment, and the like provided in the in-vehicle display device.

  Moreover, the said sound collection part of the vehicle-mounted display apparatus of this invention is comprised with the unidirectional microphone.

  According to the vehicle-mounted display device of the present invention configured as described above, sound in a specific direction can be collected intensively by using a unidirectional microphone. In particular, the voice from the driver can be collected efficiently by directing the direction of the driver.

  Moreover, the vehicle-mounted display device of the present invention includes a music output unit that outputs music.

  According to the in-vehicle display device configured as described above, the music output unit capable of outputting radio, music, and the like can be used while listening to the radio and music. Further, when performing speech recognition, the accuracy of speech recognition can be improved by detecting the output state of the music output unit and using the waveform or signal of the sound output from the music output unit.

  Further, the in-vehicle display device of the present invention includes a current position detection unit that detects a current position, and a route search guide unit that searches and guides a route from the current position detected by the current position detection unit to an arbitrary destination. And is configured.

  According to the vehicle-mounted display device configured as described above, by providing the route search unit, it is possible to perform route guidance from the current position to the destination based on the voice result recognized by the voice recognition unit.

  The present invention provides a sound collecting unit capable of changing the direction on the display unit of the in-vehicle display device, so that the direction of the sound collecting unit can be automatically directed toward the speaker even when the angle of the display unit is changed. Therefore, the on-vehicle display device can be controlled by voice.

  Hereinafter, an in-vehicle display device (an in-vehicle display device) according to an embodiment of the present invention will be described with reference to the drawings.

  An in-vehicle display device according to a first embodiment of the present invention is shown in FIG.

  As shown in FIG. 1, an in-vehicle display device 1 (an in-vehicle display device) of the present invention includes a display unit 2 having a liquid crystal display and capable of displaying an image, a microphone 3 built in the display unit 2, Detected by a microphone drive unit 4 that can move the direction of the microphone 3 in the direction of the speaker, an angle detection unit 7 that detects the display angle of the display unit 2, and an audio signal collected by the microphone 3 and the angle detection unit 7 The sound generation direction specifying unit 5 that specifies the sound generation direction from the displayed display angle, the drive control unit 6 that controls the microphone drive unit 4 from the sound generation direction specified by the sound generation direction specifying unit 5, and the audio signal collected by the microphone 3 And a voice recognition unit 8 that performs conversion processing to character data, and an operation control unit 9 that controls radio, CD, car navigation, and the like based on the character data from the voice recognition unit 8. Yes.

  The display unit 2 is configured to display an audio operation menu such as an audio track or radio channel selection, to display a map display or traffic information in route guidance, or to display a DVD or TV image. Has been. In addition, the display unit 2 can change its installed inclination by the user's operation (FIG. 3).

  The microphone 3 has unidirectionality, is built in the display unit 2, and can change the direction of the microphone with the microphone driving unit 4.

  The microphone drive unit 4 can move the direction of the microphone 3 in the direction of the speaker under the control of the drive control unit 6.

  The angle detection unit 7 has a sensor for detecting the angle of the display unit 2 and can notify the sound generation direction specifying unit 5 of information on the specified angle.

  The sound generation direction specifying unit 5 can specify the position where the sound signal level is maximum based on the sound signal collected by the microphone 3 and the angle information of the display unit specified by the angle detection unit 7, and can notify the drive control unit 6 of the position. It is like that.

  The drive control unit 6 can output a control signal for directing the microphone 3 in the sound generation direction specified by the sound generation direction specifying unit 5 to the microphone drive unit 4.

  The voice recognition unit 8 can convert the voice signal collected by the microphone 3 into character data by voice recognition processing and output it to the operation control unit 9.

  The operation control unit 9 can control the operation of the device according to the character data from the voice recognition unit 8.

  The in-vehicle display device 1 configured in this manner moves the direction of the microphone to a position where the sound signal collected by the microphone is maximized whenever the driver makes a sound and inputs the sound, Recognition accuracy can be improved.

  Next, the operation of the in-vehicle display display device 1 will be specifically described with reference to a flowchart. FIG. 4 is a flowchart showing a microphone orientation control processing procedure when the power is turned on or when the angle of the display unit 2 is changed by the user. This processing program is executed when the in-vehicle display device 1 is activated or when the angle of the display unit 3 is changed by the user.

  First, the sound generation direction specifying unit 5 reads the angle θ (FIG. 3) of the display unit 3 detected by the angle detection unit 7 (step S11).

  The sound generation direction specifying unit 5 specifies the angle of the microphone 3 from the data table (FIG. 7) showing the relationship between the angle θ of the display unit in the internal memory and the direction of the microphone 3. Alternatively, the angle of the microphone 3 is read from the memory storing the position where the audio signal is maximized at the angle θ until the previous time (step S12).

  The drive control unit 6 outputs a control signal to the microphone drive unit 4 based on the information on the angle of the microphone 3, changes the direction of the microphone 3 (step S13), and ends this process.

  FIG. 5 is a flowchart showing a procedure for controlling the microphone direction during a voice recognition operation.

  This microphone orientation control processing program is executed simultaneously with the speech recognition processing when operating the speech recognition function.

  First, the sound signal collected by the microphone 3 is input to the sound generation direction specifying unit 5 and the signal level is measured (step S21), and at the same time, the sound signal is output to the sound recognition unit.

The sound generation direction specifying unit 5 compares the signal level measured in step S21 with the appropriate target sound level stored in the memory (step S22), and if it has reached the level, the process is terminated. If the level has not been reached, the angle of the microphone 3 and the measured signal level are stored in the memory (step S23), and step S23 is repeated a predetermined number of times or compared (step S24). (S24, NO), the angle of the microphone 3 is changed (step S26), and the process returns to step S22. When the angle of the microphone 3 is changed, the microphone 3 may be moved in increments of 5 °, for example, with a priority of up → down → left → right.

  If the appropriate target audio level is not reached when step S23 is performed a predetermined number of times, the angle of the microphone 3 having a signal level close to the appropriate target audio level is specified in the stored data, and the angle of the specified microphone 3 is set. The direction of the microphone 3 is changed (step S25), and this process ends.

  According to the in-vehicle display device 1 of the first embodiment of the present invention, by providing a mechanism that can change the direction of the microphone 3 mounted inside the display, the angle of the display can be changed, or the driver can Even if it changes, the direction of the microphone 3 can be directed toward the speaker. Therefore, stable voice control can be performed.

  Next, an in-vehicle display device according to a second embodiment of the present invention is shown in FIG.

  As shown in FIG. 2, the in-vehicle display device 21 (in-vehicle display device) of the present invention includes a display unit 22 that has a liquid crystal display and can display an image, a microphone 23 built in the display unit 22, A microphone drive unit 24 that can move the direction of the microphone 23 toward the speaker, an angle detection unit 27 that detects a display angle of the display unit 22, and an audio signal processing unit 30 that performs signal processing such as noise reduction. The sound generation direction specifying unit 25 that specifies the sound generation direction from the sound signal of the microphone 23 that has been signal-processed by the sound signal processing unit 30 and the display angle detected by the angle detection unit 27, and the sound generation direction specifying unit 25 A drive control unit 26 that controls the microphone drive unit 24 from the sound generation direction, and a voice recognition unit that performs conversion processing to character data based on the voice signal of the microphone 23 that has been signal-processed by the voice signal processing unit 30 8, an operation control unit 29 that controls radio, CD, car navigation, and the like based on character data from the voice recognition unit 28, a music output unit 31 that outputs music, and a current position detection unit that detects the current position 32 and a route search guide unit 33 for searching and guiding a route from the current position detected by the current position detection unit 32 to an arbitrary destination.

  The display unit 22, the microphone 23, the microphone drive unit 24, the angle detection unit 27, the sound generation direction specifying unit 25, the drive control unit 26, the voice recognition unit 28, and the operation control unit 29 are configured in the same manner as in the first embodiment. Therefore, detailed description is omitted.

  The audio signal processing unit 30 can reduce the influence of music from the speaker by using the speaker output signal from the music output unit 31. In addition, the internal memory is provided with a data table showing the relationship between road information and road noise patterns of expressways and ordinary roads, and road noise can be reduced by specifying a road that is currently being traveled by the current position detection unit 32. It is like that.

  The music output unit 31 can output music such as radio and CD, and voice guidance of the route search guide unit 33 to the speaker and the voice signal processing unit 30, and can receive the voice recognition operation notification from the voice recognition unit 28. The music output to can be muted.

  The current position detection unit 32 can specify the current position from vehicle signals such as GPS and vehicle speed signals and map information, and can output road information on the road to the audio signal processing unit 30.

The route search guide unit 33 can search and guide a route from the current position detected by the current position detection unit 32 to an arbitrary destination, and can output the voice at the time of guidance to the music output unit 31. It has become.

  The in-vehicle display device 21 configured as described above is configured such that when the driver makes a voice and inputs a voice, the direction of the microphone is moved to a position where the voice signal collected by the microphone is maximized, and the speaker This reduces the influence of music guidance and voice guidance for car navigation, so that the accuracy of voice recognition can be improved.

  Next, the operation of the in-vehicle display device 21 will be specifically described with reference to a flowchart.

  FIG. 6 is a flowchart illustrating a microphone orientation control processing procedure during a voice recognition operation according to the second embodiment. This microphone orientation control processing program is executed simultaneously with the speech recognition processing when operating the speech recognition function.

  First, when the speech recognition process is activated, it is confirmed whether or not the mute function of the speaker output is ON / OFF (step S31). If it is ON, the output of the music output unit 31 is muted (step S32). The sound signal collected by the microphone 23 is input to the sound signal processing unit 30 without performing the process. The audio signal processing unit 30 inputs the speaker output signal from the music output unit 31 and the road information from the current position detection unit 32, and performs noise reduction processing on the audio signal from the microphone 23 (step S33). Next, the microphone sound signal from the sound signal processing unit 30 is output to the sound generation direction specifying unit 25 and simultaneously to the sound recognition unit 28.

  The sound generation direction specifying unit 25 measures the input voice signal (step S34), compares the measured signal level with the appropriate target voice level stored in the memory (step S35), and if the level has been reached, this processing is performed. Exit. If the level has not been reached, the angle of the microphone 23 and the measured signal level are stored in the memory (step S36), and step S36 is repeated a predetermined number of times or compared (step S36). (S37, NO), the angle of the microphone 23 is changed (step S39), and the process returns to step S34. When changing the angle of the microphone 23, for example, the microphone 23 may be moved in increments of 5 ° with the priority of up → down → left → right.

  When the appropriate target audio level is not reached when the step S35 is performed a predetermined number of times, the angle of the microphone 23 having a signal level close to the appropriate target audio level is specified in the stored data, and the angle of the specified microphone 23 is set. The direction of the microphone 23 is changed (step S38), and this process ends.

  Thus, according to the vehicle-mounted display device 21 of the second embodiment of the present invention, by providing a mechanism that can change the direction of the microphone mounted inside the display, the angle of the display can be changed or the driver can be changed. In addition, the microphone can be turned to the direction of the speaker, and the music output function and the current position detection function can reduce the effects of speaker output and road noise. Voice control can be performed.

  The in-vehicle display device according to the present invention is provided with a microphone that can change the direction inside the in-vehicle display, so that the direction of the microphone can be directed toward the speaker even if the angle of the display is changed. Therefore, it has the effect that stable voice control can be performed, and is useful as a car navigation system or the like in which the angle of the display can be changed by the user.

The block diagram of the vehicle-mounted display apparatus in the 1st Embodiment of this invention The block diagram of the vehicle-mounted display apparatus in the 2nd Embodiment of this invention The schematic diagram which shows the display part operation | movement of the display apparatus of this invention The flowchart for operation | movement explanation at the time of starting and display angle change in the 1st Embodiment of this invention Flow chart for explaining the operation at the time of voice recognition in the first embodiment of the present invention The flowchart for operation | movement description at the time of voice recognition implementation in the 2nd Embodiment of this invention The table | surface and schematic diagram which show the relationship between the angle of the display part of this invention, and the directionality of a microphone

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 In-vehicle display apparatus 2 Display part 3 Microphone part 4 Microphone drive part 5 Sound generation direction drive part 6 Drive control part 7 Angle detection part 8 Speech recognition part 9 Operation control part 21 Car-mounted display apparatus 22 Display part 23 Microphone part 24 Microphone drive part 25 Sound generation direction drive unit 26 Drive control unit 27 Angle detection unit 28 Speech recognition unit 29 Operation control unit 30 Audio signal processing unit 31 Music output unit 32 Current position detection unit 33 Route search guide unit

Claims (5)

A display unit;
A display angle detection unit for detecting a display angle of the display unit;
A sound collection unit that is installed in the display unit and collects external sounds;
A sound collection direction drive unit that changes the direction of the sound collection unit and changes the sound collection direction;
A sound generation direction specifying unit that specifies a sound generation direction from the sound detected by the sound collection unit and the display angle detected by the display angle detection unit;
A vehicle-mounted display device comprising: a drive control unit that controls the sound collection direction drive unit from the sound generation direction specified by the sound generation direction specifying unit.   A speech recognition unit for recognizing the speech detected by the sound collection unit, and an operation control unit for controlling the operation of the in-vehicle display device based on a speech instruction of a recognition result recognized by the speech recognition unit. The in-vehicle display device according to claim 1, wherein the display device is an on-vehicle display device.   The in-vehicle display device according to claim 1, wherein the sound collection unit is configured by a unidirectional microphone.   The in-vehicle display device according to any one of claims 1 to 3, further comprising a music output unit that outputs music. A current position detector for detecting the current position;
The route search guide part which searches and guides the route from the current position detected by the current position detection part to an arbitrary destination is provided. In-vehicle display device.

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