JP2016212312A - Acoustic characteristic measurement device, method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an acoustic characteristic measurement device, method and program that can suppress reduction in measurement accuracy of acoustic characteristics arising from directions of portable terminal devices.SOLUTION: An on-vehicle device 1 includes: an information acquisition unit 53 that outputs a measurement sound from a speaker 22FR to acquire characteristic information on sounds collected by a microphone 118 of a portable terminal device 90 while making a pose of the portable terminal device different; a difference calculation unit 54 that calculates difference data between two kinds of the characteristic information; a difference database 55A that acquires difference data calculated by the difference calculation unit in a similar way as changing a combination of two poses thereof in a state where the measurement sound is outputted from a sound source having a position relationship with the portable terminal device 90 known, and store the acquired difference data; a database retrieval unit 55 that retrieves the difference data closest to the difference data calculated by the difference calculation unit 54 from the database 55A; a sound source specification unit 56 that specifies a direction of the sound source on the basis of a retrieval result; and an acoustic characteristic determination unit 58 that determines an acoustic characteristic at a hearing position on the basis of the retrieval result.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an acoustic characteristic measuring apparatus, method, and program for measuring acoustic characteristics at a listening position of a user in a passenger compartment or the like.

  2. Description of the Related Art Conventionally, an in-vehicle system in which acoustic characteristics are measured using a microphone unit of a mobile phone disposed in a vehicle compartment is known (for example, see Patent Document 1). By using the microphone part of the cellular phone, sound measurement data can be obtained at any place other than the driver's seat of the vehicle, and a comfortable sound at this place can be provided.

Japanese Patent No. 4407571

  By the way, when the microphone part of the mobile phone is used for measuring the acoustic characteristics as in the in-vehicle system disclosed in Patent Document 1, there is an influence of the directivity of the microphone part itself or the case of the mobile phone. There is a problem that the measurement result of the sound characteristic varies greatly depending on the direction of the sound, and the measurement accuracy of the acoustic characteristics using the mobile phone (mobile terminal device) is lowered.

  The present invention was created in view of the above points, and an object of the present invention is to provide an acoustic characteristic measuring device, method, and method that can suppress a decrease in measurement accuracy of acoustic characteristics caused by the orientation of the mobile terminal device. To provide a program.

  In order to solve the above-described problems, an acoustic characteristic measuring apparatus according to the present invention includes a speaker installed in an acoustic space and a portable phone disposed at a position away from the speaker when a predetermined measurement sound is output from the speaker. Two types of characteristic information acquired by the characteristic acquisition means and characteristic acquisition means for acquiring the characteristic information of the sound collected by the microphone provided in the terminal device in correspondence with each posture by changing the posture of the mobile terminal device The difference calculation means for calculating the difference between the mobile terminal device and the mobile terminal device while changing the attitude of the mobile terminal device while measuring sound is output from a sound source whose positional relationship with the mobile terminal device is known. The difference which stored the result of having changed the combination of two postures, and calculating the difference of the characteristic information corresponding to two postures by measuring the characteristic information of the sound that was sounded Data storage means, difference data search means for searching difference data closest to the difference data calculated by the difference calculation means from the difference data storage means, and known data corresponding to the difference data searched by the difference data search means Based on the sound source direction specifying means for specifying the direction of the sound source having the positional relationship, and the direction of the sound source specified by the sound source direction specifying means, the characteristic information corresponding to the nearest difference data is specified, and this characteristic information is used. And an acoustic characteristic determining means for determining an acoustic characteristic at the position when the portable terminal device arranged in the acoustic space is set as the listening position.

  The acoustic characteristic measurement method of the present invention collects sound by a microphone provided in a mobile terminal device arranged at a position away from the speaker when a predetermined measurement sound is output from the speaker installed in the acoustic space. The characteristic acquisition unit calculates the difference between the two types of characteristic information acquired by the characteristic acquisition unit and the step of acquiring the characteristic information of the sound by the characteristic acquisition unit corresponding to each posture by changing the attitude of the mobile terminal device Characteristics of the sound collected by the microphone provided in the mobile terminal device while changing the attitude of the mobile terminal device in a state in which the measurement sound is output from a sound source whose positional relationship with the mobile terminal device is known The difference which stored the result which measured the information and calculated the difference of the characteristic information corresponding to two postures while changing the combination of two postures Using the data storage means, the step of searching the difference data closest to the difference data calculated by the difference calculation means from the difference data storage means by the difference data search means, and the difference searched by the difference data search means The step of specifying the direction of the sound source having a known positional relationship corresponding to the data by the sound source direction specifying means, and the characteristic information corresponding to the nearest difference data based on the direction of the sound source specified by the sound source direction specifying means Identifying and using this characteristic information, the acoustic characteristic determination means determines the acoustic characteristic at that position when the portable terminal device arranged in the acoustic space is set as the listening position.

  Also, the acoustic characteristic measurement program of the present invention uses a microphone provided in a portable terminal device disposed at a position away from a speaker when a computer outputs a predetermined measurement sound from a speaker installed in an acoustic space. A characteristic acquisition unit that acquires characteristic information of the collected sound according to each attitude by changing the attitude of the mobile terminal device, and a difference calculation that calculates a difference between the two types of characteristic information acquired by the characteristic acquisition unit The characteristic information of the sound collected by the microphone provided in the mobile terminal device while changing the attitude of the mobile terminal device in a state where the measurement sound is output from the sound source whose positional relationship between the means and the mobile terminal device is known Difference data storage means storing the result of measuring the difference between the two postures and calculating the difference between the characteristic information corresponding to the two postures Difference data search means for searching the difference data closest to the difference data calculated by the difference calculation means from the difference data storage means, and a known positional relationship corresponding to the difference data searched by the difference data search means. Based on the direction of the sound source specified by the sound source direction specifying means and the sound source direction specifying means for specifying the direction of the sound source, characteristic information corresponding to the nearest difference data is specified, and using this characteristic information, the acoustic space When the mobile terminal device arranged inside is set as a listening position, the mobile terminal device is caused to function as an acoustic characteristic determining means for determining an acoustic characteristic at the position.

  In particular, it is desirable that the measurement of the characteristic information performed for calculating the difference data stored in the difference data storage means described above is performed in an anechoic room.

  Calculates the difference between the two poses of the characteristic information of the sound collected by the microphone of the mobile terminal device, and extracts similar data from the same type of difference data using a sound source whose positional relationship with the mobile terminal device is known By doing so, the direction of the sound source (speaker) relative to the mobile terminal device arranged in the acoustic space can be specified, so that the influence of the directivity of the microphone can be removed, and the sound caused by the orientation of the mobile terminal device A decrease in measurement accuracy of characteristics can be suppressed.

  Moreover, it is desirable that the measurement sound output from the above-described speaker and the measurement sound used for calculating the difference data stored in the difference data storage means include all frequency components within the audible band. . Thus, when the direction of the sound source is known, characteristics (directivity) that change depending on the orientation of the mobile terminal device can be obtained from the measurement results in the anechoic room. , And the deterioration of the measurement accuracy of the acoustic characteristics due to the orientation of the mobile terminal device can be further suppressed.

  In addition, it is desirable to further include a correction characteristic determination unit that determines a correction characteristic for the audio sound output from the speaker based on the acoustic characteristic determined by the acoustic characteristic determination unit. In particular, it is desirable that the above-described characteristic information is a frequency characteristic. The correction characteristic described above is preferably a characteristic that compensates for the attenuation of the frequency component that occurs before reaching the listening position from the speaker. This makes it possible to achieve ideal acoustic characteristics at the listening position.

  Further, distance calculation means for acquiring a required time until the measurement sound output from the speaker described above reaches the mobile terminal device, and calculating a distance from the speaker to the mobile terminal device based on the required time, distance calculation It is desirable to further include listening position determining means for determining the listening position based on the distance calculated by the means and the direction of the sound source specified by the sound source direction specifying means. Thereby, even when a microphone of a portable terminal device having directivity is used, an accurate listening position can be obtained.

  The acoustic space described above is preferably an indoor space of the vehicle. Alternatively, the acoustic space described above is desirably an indoor space. Thereby, it is possible to accurately obtain the acoustic characteristics at the listening position excluding the influence of reflection in the vehicle or indoors.

It is a figure which shows the structure of the vehicle-mounted system of one Embodiment. It is a figure which shows the structure of a portable terminal device. It is a figure which shows the preparation method of the difference database used with a vehicle-mounted apparatus. It is a figure which shows a set of frequency characteristics. It is a figure which shows the difference of a set of frequency characteristics shown in FIG. It is a flowchart which shows the operation | movement procedure which determines an acoustic characteristic in a vehicle-mounted apparatus. It is a flowchart which shows the operation | movement procedure of a portable terminal device. It is a figure which shows the modification of the control part in a vehicle-mounted apparatus required for listening position determination. It is a figure which shows the modification of the control part in a portable terminal device required for listening position determination. It is a flowchart which shows the operation | movement procedure of the vehicle-mounted apparatus required for distance calculation to a listening position. It is a flowchart which shows the operation | movement procedure of a portable terminal device required for the distance calculation to a listening position. It is a figure which shows an example of a phase characteristic. It is a figure which shows the result of having calculated the difference of two phase characteristics.

  Hereinafter, an in-vehicle system according to an embodiment to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of an in-vehicle system according to an embodiment. As shown in FIG. 1, the in-vehicle system according to the present embodiment includes an in-vehicle device 1 and a mobile terminal device 90.

  The in-vehicle device 1 includes a navigation processing unit 10, an audio processing unit 20, speakers 22FR, 22FL, 22RR, 22RL, an operation unit 30, an input control unit 32, a display processing unit 34, a display device 36, a hard disk device (HDD) 40, and a control. Unit 50 and Bluetooth (registered trademark) interface unit (BT IF) 70.

  The navigation processing unit 10 performs a navigation operation for guiding the traveling of the vehicle on which the in-vehicle device 1 is mounted, using the map data stored in the hard disk device 40. Used in conjunction with the GPS device 12 for detecting the position of the host vehicle, the navigation operation for guiding the running of the vehicle searches for and displays peripheral facilities and POIs (Point Of Interest) in addition to map display and route search / guidance. Etc. are included. The vehicle position detection may be performed using a combination of autonomous navigation sensors such as a gyro sensor and a vehicle speed sensor in addition to the GPS 12.

  The audio processing unit 20 performs a process of reading and reproducing music data and the like that are compressed and stored in the hard disk device 40. Note that music data or the like is read from a CD or DVD using a disk reader (not shown), or received from the mobile terminal device 90 or the like via the Bluetooth interface unit 70. May be used. In the present embodiment, there are four speakers at the front, rear, left and right in the vehicle, specifically, the speaker 22FR at the front right of the driver's seat, the speaker 22FL at the front left of the passenger seat, and the speaker 22RR at the right rear of the rear seat, A speaker 22RL is installed at the rear left of the rear seat. These four speakers 22FR, 22FL, 22RR, and 22RL receive audio signals that are controlled in sound pressure, output timing, phase, and the like from the audio processing unit 20 in consideration of a plurality of listening positions. A predetermined sound field is realized. Note that the number of speakers may be other than four.

  The operation unit 30 is for receiving an operation by the user on the in-vehicle device 1 and includes various operation keys, operation switches, operation knobs, and the like arranged around the display device 36. Further, when various operation screens and input screens are displayed on the display device 36, the display items of the operation screens and input screens can be obtained by directly pointing a part of these operation screens and input screens with a finger or the like. A touch panel that detects the position of the finger pointed to is a part of the operation unit 30 in order to enable operation using such an operation screen or an input screen. As provided. Instead of using the touch panel, a part of the operation screen or the input screen may be selected according to a user instruction using a remote control unit or the like. The input control unit 32 monitors the operation unit 30 and determines the operation content.

  The display processing unit 34 outputs video signals for displaying various operation screens, input screens, and the like, displays these screens on the display device 36, and displays map images and the like created by the navigation operation by the navigation processing unit 10. A video signal to be displayed is output and these screens are displayed on the display device 36. The display device 36 is installed in the center front of the driver seat and the passenger seat, and is configured by using, for example, a liquid crystal display device (LCD).

  The control part 50 is for controlling the whole vehicle-mounted apparatus 1, and is implement | achieved by running the predetermined program stored in ROM, RAM, etc. by CPU. The Bluetooth interface unit 70 is a communication device (Bluetooth device) that transmits and receives various data between the in-vehicle device 1 and the mobile terminal device 90 and the like by Bluetooth.

  In addition, the control unit 50 described above searches and pairs the surrounding Bluetooth devices, and measures the acoustic characteristics at the listening position when the position of the mobile terminal device 90 disposed in the vehicle interior is set as the listening position. BT (Bluetooth) processing unit 51, measurement sound output unit 52, information acquisition unit 53, difference calculation unit 54, database (DB) search unit 55, sound source direction identification unit 56, microphone directivity correction unit 57, An acoustic characteristic determination unit 58 and a correction characteristic determination unit 59 are included.

  The BT processing unit 51 performs settings necessary for transmitting / receiving data with the mobile terminal device 90 via Bluetooth, such as pairing settings.

  The measurement sound output unit 52 outputs a predetermined measurement sound from the speaker in order to create sound characteristic information in the mobile terminal device 90. For example, this measurement sound includes all frequency components within the audible band and is output from the speaker 22FR.

  When the measurement sound is output from the speaker 22FR, the information acquisition unit 53 uses the characteristic information of the sound collected by the microphone included in the mobile terminal device 90 disposed at a position separated from the speaker 22FR, as the mobile terminal device 90. Different postures are acquired to correspond to each posture. Specifically, frequency characteristics are used as the characteristic information.

  The difference calculation unit 54 calculates the difference between the two types of characteristic information (frequency characteristics) acquired by the information acquisition unit 53.

  The database search unit 55 searches the difference database (DB) 55A for difference data closest to the difference data calculated by the difference calculation unit 54. The difference database 55A is collected by a microphone provided in the mobile terminal device 90 while changing the attitude of the mobile terminal device 90 in a state where measurement sound is output from a sound source whose positional relationship with the mobile terminal device 90 is known. Stored is a result of measuring the characteristic information (frequency characteristic) of the sound that is sounded and calculating the difference between the characteristic information corresponding to the two postures by changing the combination of the two postures. The difference database 55A is stored in the hard disk device 40, for example.

  The sound source direction specifying unit 56 specifies the direction of the sound source (speaker 22FR) having a known positional relationship corresponding to the difference data searched by the database search unit 55.

  Based on the direction of the sound source specified by the sound source direction specifying unit 56, the acoustic characteristic determining unit 58 specifies the characteristic information corresponding to the nearest difference data from the difference database, and using this characteristic information, the acoustic space The acoustic characteristic at the position when the position of the portable terminal device 90 arranged inside (in the vehicle interior space) is set as the listening position is determined.

  The correction characteristic determination unit 59 determines a correction characteristic for the audio sound output from the speaker 22FR based on the acoustic characteristic determined by the acoustic characteristic determination unit 58.

  The information acquisition unit 53 described above is a characteristic acquisition unit, the difference calculation unit 54 is a difference calculation unit, the difference database 55A is a difference data storage unit, the database search unit 55 is a difference data search unit, and the sound source direction specifying unit 56 is a sound source. As the direction specifying means, the acoustic characteristic determination unit 58 corresponds to the acoustic characteristic determination means, and the correction characteristic determination unit 59 corresponds to the correction characteristic determination means.

  FIG. 2 is a diagram illustrating a configuration of the mobile terminal device 90. As shown in FIG. 2, the mobile terminal device 90 of this embodiment is generally called a smartphone, and has functions of a mobile phone and a mobile information terminal. The portable terminal device 90 includes a control unit 100, an operation unit 110, a display unit 112, a digital-analog converter (D / A) 114, a speaker 116, a microphone 118, an analog-digital converter (A / D) 120, a GPS. (Global Positioning System) A receiver 130, an attitude sensor 132, a telephone processing unit 140, and a Bluetooth interface unit (BT I / F) 150 are provided.

  The control unit 100 is for controlling the entire mobile terminal device 90, and includes a CPU, a RAM, a ROM, etc., and is stored in a program or memory (not shown) stored in the RAM or ROM. Various operations are performed by executing various application programs.

  The operation unit 110 includes a numeric keypad, other keys, and various switches, and accepts user operation instructions and various inputs. Using the operation unit 110 configured with a touch panel, the user may point the numeric keypad displayed on the screen with a finger or the like. The display unit 112 is configured by an LCD (Liquid Crystal Display) or the like, and displays operation content using the operation unit 110, control content and processing content (such as map display) by the control unit 100, and the like.

  The digital-analog converter 114 converts voice data and measured sound data when the mobile terminal device 90 is used as a telephone into an analog signal and outputs the analog signal from the speaker 116. The microphone 118 collects ambient sound and measurement sound output from the speaker 22FR of the in-vehicle device 1. The collected sound and measurement sound are converted into digital data by the analog-digital converter 120.

  The GPS receiver 130 receives signals transmitted from a plurality of GPS satellites, and outputs positioning data indicating the position of the own device (own vehicle position) at predetermined time intervals. The orientation sensor 132 is a sensor that detects the orientation of the mobile terminal device 90, and specifically, a 3-axis sensor is used. For example, when the casing of the mobile terminal device 90 is a thin rectangular parallelepiped, the X axis, the Y axis, and the Z axis are set in parallel to the opposing surfaces, and the angles around the respective axes (example shown in FIG. 3) Then, a pitch around the X axis, a roll around the Y axis, and a yaw around the Z axis are detected.

  The telephone processing unit 140 performs processing as a mobile phone. For example, the telephone processing unit 140 performs outgoing / incoming processing with a base station to perform telephone call processing, Internet connection processing, and the like. The Bluetooth interface unit 150 is a communication device (Bluetooth device) that transmits and receives various data between the mobile terminal device 90 and the in-vehicle device 1 by Bluetooth.

  In addition, the control unit 100 described above searches and pairs with surrounding Bluetooth devices, detects the attitude of the mobile terminal device 90, collects measurement sound, and creates characteristic information. 1, a BT processing unit 101, an attitude detection unit 102, a measurement sound collection unit 103, a characteristic information creation unit 104, and an information transmission unit 105 are included.

  The BT processing unit 101 performs settings necessary for transmitting and receiving data with Bluetooth from the in-vehicle device 1, for example, pairing settings.

  The posture detection unit 102 detects the posture of the mobile terminal device 90 based on the output of the posture sensor 132 and creates posture information including the detection result.

  The measurement sound collection unit 103 collects the measurement sound output from the speaker 22FR of the in-vehicle device 1 with the microphone 118.

  The characteristic information creation unit 104 creates characteristic information of the measurement sound based on the measurement sound collected by the measurement sound collection unit 103. Specifically, the frequency characteristic of the measurement sound collected for a certain time is created.

  The information transmission unit 105 transmits the posture information created by the posture detection unit 102 and the characteristic information created by the characteristic information creation unit 104 to the in-vehicle device 1 via Bluetooth.

  The in-vehicle system of the present embodiment has such a configuration. Next, the in-vehicle device 1 and the mobile terminal device 90 are linked to each other, and the acoustic characteristics at the listening position of the user in which the mobile terminal device 90 is arranged. The operation for determining the above will be described.

  FIG. 3 is a diagram illustrating a method of creating the difference database 55A used in the in-vehicle device 1. The speaker SP and the mobile terminal device 90 shown in FIG. 3 have a known positional relationship and are arranged in an anechoic chamber. Then, measurement sound including all frequency components within the audible band is output from the speaker SP, and the frequency characteristics are calculated based on the result of sound collection by the microphone 118 (FIG. 2) provided in the mobile terminal device 90. Such measurement sound output, sound collection, and frequency characteristic calculation are performed while changing the attitude of the mobile terminal device 90. For example, assuming that the attitude of the mobile terminal device 90 is expressed by angles around three axes (pitch around the X axis, roll around the Y axis, yaw around the Z axis), each of the pitch, roll, and yaw is 10 °. The measurement sound output, sound collection and frequency characteristics are calculated while shifting by (or 15 °). Further, the two frequency characteristics obtained in this way are taken out, and the difference between them is calculated. Difference data obtained by this calculation exists in the number corresponding to the combination of two frequency characteristics, and each difference data, the frequency characteristic that is the basis of the calculation, and the posture information corresponding to each frequency characteristic are a set. Thus, the difference database 55A is created. The differential database 55A created in advance in this way is stored in the hard disk device 40 of the in-vehicle device 1.

  FIG. 4 is a diagram illustrating a set of frequency characteristics. FIG. 4A shows frequency characteristics when the posture is a (for example, roll = 0 °, pitch = 0 °, yaw = 0 °), the horizontal axis indicates the frequency, and the vertical axis indicates the signal intensity of each frequency component. Is shown. FIG. 4B shows frequency characteristics when the posture is b (for example, roll = 0 °, pitch = 0 °, yaw = 90 °), the horizontal axis represents frequency, and the vertical axis represents each frequency component. Signal strength is shown.

  FIG. 5 is a diagram showing the difference between the set of frequency characteristics shown in FIG. In the difference data shown in FIG. 5, the horizontal axis indicates the frequency, and the vertical axis indicates the difference value of the signal intensity. The difference data shown in FIG. 5 is stored in the difference database 55A together with the set of frequency characteristics shown in FIG. 4 and the corresponding postures a and b.

  FIG. 6 is a flowchart showing an operation procedure for determining acoustic characteristics in the in-vehicle device 1. It is assumed that the mobile terminal device 90 is held at the listening position (for example, the position of the face or ear) by the user at the time of starting this operation procedure.

  First, the measurement sound output unit 52 determines whether or not the preparation of the mobile terminal device 90 is completed while maintaining the posture A (step 100). In the present embodiment, one posture of the mobile terminal device 90 that acquires frequency characteristics is A, and the other posture is B. A negative determination is made until the preparation of the posture A is completed, and this determination is repeated. Further, when the preparation for the posture A is completed, an affirmative determination is made in the determination of step 100.

  The measurement sound output unit 52 outputs a predetermined measurement sound from the speaker 22FR (step 102). Thereafter, the information acquisition unit 53 receives and acquires posture information and characteristic information corresponding to the posture A sent from the mobile terminal device 90 by Bluetooth (step 104).

  Thereafter, the same operation is performed for the posture B. That is, the measurement sound output unit 52 determines whether or not the preparation of the mobile terminal device 90 is completed while maintaining the posture B (step 106). A negative determination is made until the preparation of posture B is completed, and this determination is repeated. Further, when the preparation for the posture B is completed, an affirmative determination is made in the determination of step 106. Next, the measurement sound output unit 52 outputs a predetermined measurement sound from the speaker 22FR (step 108). Further, the information acquisition unit 53 receives and acquires posture information and characteristic information corresponding to the posture B sent from the mobile terminal device 90 via Bluetooth (step 110).

  Next, the difference calculation unit 54 calculates the difference between the two types of characteristic information (frequency characteristics) acquired in Steps 104 and 110 (Step 112). Further, the database search unit 55 extracts difference data closest to the difference data calculated by the difference calculation unit 54 from the difference database 55A (step 114).

  Next, the sound source direction specifying unit 56 specifies the direction of the sound source (speaker 22FR) having a known positional relationship corresponding to the difference data searched by the database search unit 55 (step 116). As shown in FIG. 3, since the relationship between the two types of postures a and b used to create the difference data and the speaker SP is known in advance, if the difference data to be used can be specified, the speaker It is possible to know the postures a and b of the mobile terminal device 90 corresponding to 22FR, that is, the direction of the sound source (speaker 22FR) viewed from the mobile terminal device 90. Further, it can be specified that one frequency characteristic used for calculating the difference data corresponds to the posture a, and the other frequency characteristic corresponds to the posture b. These frequency characteristics indicate the directivity of the microphone 118 in each of the postures a and b, and the degree of attenuation of each frequency component in each of the postures a and b can be known along with the directivity of the microphone 118. it can.

  Next, the acoustic characteristic determination unit 58 specifies the characteristic information (frequency characteristic) corresponding to the nearest difference data from the difference database 55A based on the direction of the sound source specified by the sound source direction specifying unit 56. Using the frequency characteristic, the acoustic characteristic at the position when the position of the mobile terminal device 90 arranged in the acoustic space is set as the listening position is determined (step 118).

  As described above, the frequency characteristics of the postures a and b corresponding to the closest difference data specified from the difference database 55A indicate the degree of attenuation of each frequency component in each posture. On the other hand, it can be said that the frequency characteristics acquired in steps 104 and 110 take into account other factors such as the influence of wall surfaces and seats forming the vehicle interior space in addition to the attenuation due to the directivity of the microphone 118. . Therefore, the acoustic characteristics at the listening position in the actual acoustic space are determined by correcting the frequency characteristics acquired in steps 104 and 110 so as to cancel out the degree of attenuation of each frequency component in each posture. can do.

  Next, the correction characteristic determination unit 59 determines a correction characteristic for the audio sound output from the speaker 22FR based on the acoustic characteristic determined by the acoustic characteristic determination unit 58 (step 120). This correction characteristic is a characteristic for canceling the attenuation of the frequency characteristic due to factors other than the directivity of the microphone 118, and a filter for returning the acoustic characteristic specified in step 118 to a frequency characteristic in which each frequency component is flat. It corresponds to a characteristic. If such a correction characteristic can be determined, an ideal sound field can be realized by offsetting the difference between actual acoustic spaces.

  FIG. 7 is a flowchart showing an operation procedure of the mobile terminal device 90. First, the posture detection unit 102 determines whether or not the preparation of the posture A is completed based on the output of the posture sensor 132 (step 200). For example, it is assumed that the preparation of the posture A is completed when the user holds the mobile terminal device 90 in the posture A and performs a predetermined operation using the operation unit 110. If the preparation is not completed, a negative determination is made and this determination is repeated. Further, when the preparation for the posture A is completed, an affirmative determination is made in the determination of step 200. In this case, the posture detection unit 102 notifies the in-vehicle device 1 via Bluetooth that the preparation of the posture A has been completed (step 202).

  Next, the posture detection unit 102 detects the posture of the mobile terminal device 90 based on the output of the posture sensor 132 (step 204), and creates posture information including the detection result (step 206).

  In addition, the measurement sound collection unit 103 collects the measurement sound output from the speaker 22FR of the in-vehicle device 1 with the microphone 118 (step 208). The characteristic information creation unit 104 creates characteristic information (calculates frequency characteristics) of the measurement sound based on the measurement sound collected by the measurement sound collection unit 103 (step 210). Thereafter, the information transmission unit 105 transmits the posture information created by the posture detection unit 102 and the characteristic information created by the characteristic information creation unit 104 to the in-vehicle device 1 via Bluetooth (step 212).

  Thereafter, the same operation is performed for the posture B. That is, the posture detection unit 102 determines whether or not the preparation for the posture B is completed based on the output of the posture sensor 132 (step 214). For example, it is assumed that the preparation of the posture B is completed when the user holds the mobile terminal device 90 in the posture B and performs a predetermined operation using the operation unit 110. If the preparation is not completed, a negative determination is made and this determination is repeated. When the preparation for posture B is completed, an affirmative determination is made in the determination of step 214. In this case, the posture detection unit 102 notifies the in-vehicle device 1 via Bluetooth that the preparation of the posture B is completed (step 216).

  Next, the posture detection unit 102 detects the posture of the mobile terminal device 90 based on the output of the posture sensor 132 (step 218), and creates posture information including the detection result (step 220).

  In addition, the measurement sound collection unit 103 collects the measurement sound output from the speaker 22FR of the in-vehicle device 1 with the microphone 118 (step 222). The characteristic information creation unit 104 creates characteristic information (calculates frequency characteristics) of the measurement sound based on the measurement sound collected by the measurement sound collection unit 103 (step 224). Thereafter, the information transmission unit 105 transmits the posture information created by the posture detection unit 102 and the characteristic information created by the characteristic information creation unit 104 to the in-vehicle device 1 via Bluetooth (step 226).

  As described above, in the in-vehicle system of the present embodiment, the difference between the two postures of the characteristic information of the sound collected by the microphone 118 of the portable terminal device 90 is calculated, and the positional relationship with the portable terminal device 90 is known. By extracting close ones of the same kind of difference data using the sound source, the direction of the sound source (speaker 22FR) with respect to the mobile terminal device 90 arranged in the acoustic space can be specified. The influence by the property can be removed, and the decrease in the measurement accuracy of the acoustic characteristics due to the orientation of the mobile terminal device 90 can be suppressed.

  In addition, the measurement sound output from the speaker 22FR and the measurement sound used for calculating the difference data stored in the difference database 55A include all frequency components within the audible band. Thereby, when the direction of the sound source is known, a characteristic (directivity) that changes depending on the orientation of the mobile terminal device 90 can be obtained from the measurement result in the anechoic chamber. The actual directivity of 118 can be known, and the deterioration of the measurement accuracy of the acoustic characteristics due to the orientation of the mobile terminal device 90 can be further suppressed.

  In addition, a correction characteristic determination unit 59 that determines a correction characteristic for the audio sound output from the speaker 22FR based on the acoustic characteristic determined by the acoustic characteristic determination unit 58 is provided. In particular, it is possible to realize ideal acoustic characteristics at the listening position by making the correction characteristic compensate for the attenuation of the frequency component generated before reaching the listening position from the speaker 22FR.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the above-described embodiment, the acoustic characteristics of the listening position in the vehicle interior space and the correction characteristics necessary for realizing the ideal acoustic characteristics at the listening position are obtained. Since the direction of the speaker 22FR) is known, the position (listening position) of the mobile terminal device 90 in the vehicle interior space may be determined by obtaining the distance between them.

  FIG. 8 is a diagram illustrating a modification of the control unit in the in-vehicle device 1 necessary for determining the listening position. The control unit 50A shown in FIG. 8 differs from the control unit 50 shown in FIG. 1 in that a time setting unit 60, an arrival time acquisition unit 61, a distance calculation unit 62, and a listening position determination unit 63 are added. Yes. Other configurations are the same as those of the in-vehicle device 1 shown in FIG. 1, and detailed description thereof is omitted.

  The time setting unit 60 sets a time common to these operations in order to perform the operation of the in-vehicle device 1 and the operation of the mobile terminal device 90 at timing synchronized with each other. For example, the time is set so as to be synchronized with the time information included in the signal received from the GPS satellite by the GPS receiver 12.

  The arrival time acquisition unit 61 acquires the time when the measurement sound output from the speaker 22FR reaches the mobile terminal device 90. For example, information including the arrival time of the measurement sound is transmitted from the mobile terminal device 90 via Bluetooth, and the arrival time is extracted from this information.

  The distance calculation unit 62 acquires a required time until the measurement sound output from the speaker 22FR reaches the mobile terminal device 90, and calculates a distance from the speaker 22FR to the mobile terminal device 90 based on the required time.

  The listening position determination unit 63 determines the listening position (the position of the mobile terminal device 90) based on the distance calculated by the distance calculation unit 62 and the direction of the sound source (speaker 22FR) specified by the sound source direction specifying unit 56. decide.

  FIG. 9 is a diagram illustrating a modification of the control unit in the mobile terminal device 90 necessary for determining the listening position. The control unit 100A illustrated in FIG. 9 is different from the control unit 100 illustrated in FIG. 2 in that a time setting unit 106 and an arrival time transmission unit 107 are added. The other configuration is the same as that of the mobile terminal device 90 shown in FIG. 2, and detailed description thereof is omitted.

  The time setting unit 106 sets a time common to these operations in order to perform the operation of the in-vehicle device 1 and the operation of the mobile terminal device 90 at timing synchronized with each other. For example, the time is set so as to be synchronized with the time information included in the signal received from the GPS satellite by the GPS receiver 130.

  The arrival time transmitting unit 107 transmits information including the arrival time of the measurement sound collected by the measurement sound collecting unit 103 to the in-vehicle device 1 via Bluetooth.

  FIG. 10 is a flowchart showing an operation procedure of the in-vehicle device 1 necessary for calculating the distance to the listening position. First, the time setting unit 60 sets the time so as to synchronize with the time information included in the signal received from the GPS satellite (step 300).

  Next, the measurement sound output unit 52 outputs the measurement sound from the speaker 22FR at a predetermined time t1 (step 302). When the measurement sound reaches the mobile terminal device 90, the arrival time of the measurement sound is transmitted from the mobile terminal device 90, and the arrival time acquisition unit 61 receives and acquires the arrival time (step 304).

  Next, the distance calculation unit 62 acquires (calculates) a required time until the measurement sound output from the speaker 22FR reaches the mobile terminal device 90, and from the speaker 22FR to the mobile terminal device 90 based on the required time. Is calculated (step 306).

  FIG. 11 is a flowchart showing an operation procedure of the mobile terminal device 90 necessary for calculating the distance to the listening position. First, the time setting unit 106 sets the time so as to synchronize with the time information included in the signal received from the GPS satellite (step 400). Next, the measurement sound collecting unit 103 collects the measurement sound output from the speaker 22FR of the in-vehicle device 1 with the microphone 118 (step 402), and the arrival time transmitting unit 107 determines the arrival time of the measurement sound on the vehicle. It transmits toward the apparatus 1 (step 404).

  The listening position determination unit 63 of the in-vehicle device 1 performs the distance calculated in this manner by the distance calculation unit 62 (step 306 in FIG. 10) and the direction of the sound source specified by the sound source direction specifying unit 56 (step in FIG. 6). 116), the position of the mobile terminal device 90 as the listening position can be determined. Thereby, even when a microphone of a portable terminal device having directivity is used, an accurate listening position can be obtained.

  In the above-described embodiment, the frequency characteristic is used as the two characteristic information for which the difference is calculated. However, other characteristic information may be used. For example, phase characteristics may be used instead of frequency characteristics. FIG. 12 is a diagram illustrating an example of phase characteristics. In FIG. 12, the horizontal axis represents elapsed time, and the vertical axis represents signal intensity. FIG. 13 is a diagram illustrating a result of calculating a difference between two phase characteristics. In FIG. 13, the horizontal axis indicates the elapsed time, and the vertical axis indicates the difference value of the signal intensity.

  In the above-described embodiment, the present invention is applied with the vehicle interior space as the acoustic space. However, the present invention is also applied to the case where the indoor interior space is the acoustic space, or the outdoor acoustic space. The acoustic characteristics at the listening position may be determined.

  As described above, according to the present invention, the difference between the two postures of the characteristic information of the sound collected by the microphone of the mobile terminal device is calculated, and the sound source whose positional relationship with the mobile terminal device is known is used. By extracting the closest of the same type of difference data, the direction of the sound source (speaker) with respect to the mobile terminal device arranged in the acoustic space can be specified, so that the influence of the directivity of the microphone can be removed. It is possible to suppress a decrease in measurement accuracy of acoustic characteristics due to the orientation of the mobile terminal device.

1 In-vehicle device 12, 130 GPS receiver 22FR, 22FL, 22RR, 22R, 116 Speaker 50, 100 Control unit 70, 150 Bluetooth interface unit (BT IF)
51, 101 BT (Bluetooth) processing unit 52 Measurement sound output unit 53 Information acquisition unit 54 Difference calculation unit 55 Database (DB) search unit 56 Sound source direction identification unit 58 Acoustic characteristic determination unit 59 Correction characteristic determination unit 60, 106 Time setting unit 61 arrival time acquisition unit 62 distance calculation unit 63 listening position calculation unit 90 mobile terminal device 118 microphone

Claims (11)

A speaker installed in the acoustic space;
When the predetermined measurement sound is output from the speaker, the characteristic information of the sound collected by the microphone provided in the mobile terminal device arranged at a position separated from the speaker is changed to the posture of the mobile terminal device. Characteristic acquisition means for acquiring corresponding to each posture;
A difference calculating means for calculating a difference between two types of characteristic information acquired by the characteristic acquiring means;
Characteristics of sound collected by the microphone provided in the mobile terminal device while changing the attitude of the mobile terminal device in a state where measurement sound is output from a sound source whose positional relationship with the mobile terminal device is known A difference data storage unit that stores a result of measuring information and calculating a difference between the characteristic information corresponding to two postures by changing a combination of the two postures;
Difference data search means for searching the difference data closest to the difference data calculated by the difference calculation means from the difference data storage means;
Sound source direction specifying means for specifying the direction of the sound source having a known positional relationship corresponding to the difference data searched by the difference data search means;
Based on the direction of the sound source specified by the sound source direction specifying means, characteristic information corresponding to the nearest difference data is specified, and the portable terminal device arranged in the acoustic space using this characteristic information Acoustic characteristic determining means for determining the acoustic characteristics at that position when
An acoustic characteristic measuring apparatus comprising: In claim 1,
The acoustic characteristic measurement apparatus according to claim 1, wherein the measurement of the characteristic information performed to calculate the differential data stored in the differential data storage means is performed in an anechoic room. In claim 2,
The measurement sound output from the speaker and the measurement sound used for calculating the difference data stored in the difference data storage means include all frequency components within an audible band. A characteristic acoustic characteristic measuring device. In any one of Claims 1-3,
An acoustic characteristic measuring apparatus, further comprising: a correction characteristic determining unit that determines a correction characteristic for the audio sound output from the speaker based on the acoustic characteristic determined by the acoustic characteristic determining unit. In claim 4,
The acoustic characteristic measuring device, wherein the characteristic information is a frequency characteristic. In claim 5,
The acoustic specific measurement apparatus according to claim 1, wherein the correction characteristic is a characteristic that compensates for an attenuation of a frequency component that occurs before the speaker reaches the listening position. In any one of Claims 1-6,
A distance calculating unit that obtains a required time until the measurement sound output from the speaker reaches the mobile terminal device, and calculates a distance from the speaker to the mobile terminal device based on the required time;
Listening position determining means for determining the listening position based on the distance calculated by the distance calculating means and the direction of the sound source specified by the sound source direction specifying means;
An acoustic characteristic measuring device further comprising: In any one of Claims 1-7,
The acoustic characteristic measuring apparatus, wherein the acoustic space is an interior space of a vehicle. In any one of Claims 1-7,
The acoustic characteristic measuring apparatus, wherein the acoustic space is an indoor space. When the predetermined measurement sound is output from the speaker installed in the acoustic space, the characteristic information of the sound collected by the microphone provided in the portable terminal device arranged at a position away from the speaker is obtained from the portable terminal. Obtaining the characteristic acquisition means corresponding to each posture by changing the posture of the device;
Calculating a difference between the two types of characteristic information acquired by the characteristic acquisition means by a difference calculation means;
Characteristics of sound collected by the microphone provided in the mobile terminal device while changing the attitude of the mobile terminal device in a state where measurement sound is output from a sound source whose positional relationship with the mobile terminal device is known Measuring the information and calculating the difference between the characteristic information corresponding to two postures, using a difference data storage means storing a result obtained by changing the combination of the two postures, Searching for difference data closest to the difference data calculated by the difference calculation means from the difference data storage means by the difference data search means;
Identifying a direction of the sound source having a known positional relationship corresponding to the difference data searched by the difference data search means by a sound source direction specifying means;
Based on the direction of the sound source specified by the sound source direction specifying means, characteristic information corresponding to the nearest difference data is specified, and the portable terminal device arranged in the acoustic space using this characteristic information Determining the acoustic characteristics at the position when the position is the listening position by the acoustic characteristic determination means;
A method for measuring acoustic characteristics, comprising: Computer
When the predetermined measurement sound is output from the speaker installed in the acoustic space, the characteristic information of the sound collected by the microphone provided in the portable terminal device arranged at a position away from the speaker is obtained from the portable terminal. Characteristic acquisition means for acquiring the device according to each posture by changing the posture of the device,
A difference calculating means for calculating a difference between two types of characteristic information acquired by the characteristic acquiring means;
Characteristics of sound collected by the microphone provided in the mobile terminal device while changing the attitude of the mobile terminal device in a state where measurement sound is output from a sound source whose positional relationship with the mobile terminal device is known The difference calculation unit uses a difference data storage unit that stores a result of measuring information and calculating a difference between the characteristic information corresponding to two postures by changing a combination of the two postures. Difference data search means for searching the difference data closest to the difference data calculated by the difference data storage means;
Sound source direction specifying means for specifying the direction of the sound source having a known positional relationship corresponding to the difference data searched by the difference data search means;
Based on the direction of the sound source specified by the sound source direction specifying means, characteristic information corresponding to the nearest difference data is specified, and the portable terminal device arranged in the acoustic space using this characteristic information Acoustic characteristic determining means for determining the acoustic characteristics at that position when
Acoustic characteristic measurement program to make it function.

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