JP4407571B2 - In-vehicle system, vehicle interior sound field adjustment system, and portable terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide comfortable sound atmosphere for the place other than the driving seat in the mobile room. <P>SOLUTION: The vehicle-mounted system 2 requests, to a mobile phone 50, the measured data for test sound inputted to a microphone 51 of the mobile phone 50. When the measured data for the test sound is transmitted as the response signal from the mobile phone 50, the sound signal is outputted from speakers 18a to 18d through adjustment thereof with a sound circuit 12 on the basis of the measured data of the test sound. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

The present invention car mounting system for adjusting the sound field relates cabin sound field adjustment system and the mobile terminal.

  For example, in a passenger compartment of a vehicle (for example, an automobile), a plurality of speakers are generally arranged on the left and right sides of the passenger compartment, and sound is output from these speakers to the driver's seat, front passenger seat, rear seat, and the like. It has come to be. In this case, the driver's seat is not installed at the same distance from each speaker, so the timing at which the sound reaches the ear from each speaker does not match, and the loudness or phase of the sound at the driver's seat from each speaker does not match. Will be different.

  Therefore, for example, the arrival time difference and frequency characteristic difference to the microphone installed at a fixed position such as the headrest part of the driver's seat are measured, and the delay time of the sound output timing from each speaker is set or output from each speaker. A technique for setting frequency characteristics of sound is known. In this case, all phases can be substantially matched in the driver's seat, accurate sound image localization and a correct composite waveform can be obtained, and the driver is virtually located in the center of the sound field, and the driver Can enjoy a pleasant sound.

  As such a technique, Patent Document 1 discloses that left and right acoustic signals from an acoustic source are delayed by a delay circuit, and the level of the acoustic signal is corrected by a volume adjusting circuit and applied to each speaker. The higher the angle formed by the straight line connecting the speaker and the listening position, the higher the frequency is increased by the equalizer circuit according to the directivity of the speaker, and the sound pressure frequency characteristics from each speaker are corrected to be flat at the listening position. The structure to perform is disclosed.

  In addition, in Patent Document 2, a stereo speaker is disposed at one end of a vehicle interior and the like, and a sound field correcting speaker is disposed at the other end of the interior of the vehicle so as to be emitted from the speaker and propagate to an arbitrary listening position. A configuration is disclosed in which an acoustic signal is radiated from a sound field correcting speaker with respect to a reflected synthetic signal.

Japanese Patent Application Laid-Open No. 2004-228688 discloses an in-vehicle acoustic device that has at least one speaker in a vehicle interior and outputs a signal from a head unit to the speaker, and at least one microphone disposed in the vehicle interior; And a digital signal processor for processing the signal of the sound of the vehicle interior collected as a delayed signal, reflected wave and reverberation sound, and adjusting the frequency characteristic and phase characteristic of the sound signal of the vehicle interior. A configuration is disclosed in which the output of the processor and the output from the head unit are mixed and output from a speaker.
JP-A-7-162998 JP 2000-59882 A Utility model registration No. 2605693

However, with the above-described technology, even if the sound output from the speaker is adjusted in accordance with the driver's seat, the volume or the like cannot be adjusted at any place other than the driver's seat. Will be provided.
The present invention has been made in view of the above circumstances, and its object is the car mounting system was able to provide a pleasing sound to any location other than the driver's seat in the vehicle interior, vehicle interior sound field adjustment system And it is providing the portable terminal which comprises this system.

According to the in- vehicle system of the first aspect, it operates as follows. The portable terminal includes first short-range wireless communication means and sound input means. The requesting unit requests measurement data including at least one of the sound pressure, delay time, and frequency characteristics of the sound input to the sound input unit from the portable terminal through the second short-range wireless communication unit. The portable terminal inputs the sound output from the sound output means for outputting sound to the vehicle interior by the sound input means, and when the measurement data is requested from the request means, the measurement data of the input sound is used as a response signal. It transmits through the first and second short-range wireless communication means. When the sound measurement data is transmitted as a response signal, the sound field adjustment means adjusts the sound field for the sound output of the sound output means based on the sound measurement data. Therefore, since the sound field can be adjusted based on the sound measurement data at the place where the mobile terminal is located, even in any place other than the driver's seat, a comfortable sound is provided near the location where the mobile terminal is located become able to.

As in the second aspect of the invention, even if a plurality of sound output means having different sound frequency characteristics are provided in the vehicle interior, the present invention can be applied in substantially the same manner as in the first aspect of the invention .

According to the third or fourth aspect of the invention, the sound input means inputs an external sound, the measurement means measures data of the sound input to the sound input means, and the transmission means measures the measurement means. When data is requested from the outside, the measurement data is transmitted as a response signal to the outside through the short-range wireless communication means. Therefore, when the sound data input from the outside to the portable terminal is requested, the measurement data is used as the response signal. It can be transmitted, and convenience is improved.
In addition , the characteristic difference at a plurality of predetermined frequencies in the frequency band in which sound can be input to the sound input means of the mobile terminal is corrected by applying a correction table stored corresponding to the plurality of predetermined frequencies. Alternatively, as in the invention described in claim 5 , the sound field adjusting means is provided with a bypass means for bypassing a filter means constituting a frequency band in which sound can be input to the sound input means of the portable terminal. You may comprise so that a characteristic difference may be correct | amended and a sound field may be adjusted. In such a case, the correction process can be performed quickly.

(First embodiment)
A vehicle interior sound field adjustment system according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a schematic configuration diagram of a vehicle interior sound field adjustment system of the present embodiment.

  As shown in FIG. 1, the vehicle interior sound field adjustment system 1 includes an in-vehicle system 2 mounted on a vehicle and a mobile phone 50 as a mobile terminal. The in-vehicle system 2 is an in-vehicle device having a car navigation function and an audio function. As shown in FIG. 1, the in-vehicle system 2 includes a control circuit 3, a position detector 4, a map data input device 5, an operation switch group 6, an external memory 7, a display device 8, an audio, and the control circuit 3. A microphone unit 17 serving as vehicle compartment sound input means and speakers 18a to 18d serving as sound output means are connected through the recognition device 9, the vehicle interface unit 10, the Bluetooth communication unit 11, and the voice circuit unit 12. Yes. The in-vehicle device 19 has a configuration in which the microphone unit 17 and the speakers 18a to 18d are excluded from the in-vehicle system 2, and the speakers 18a to 18d and the microphone unit 17 can be externally attached to the in-vehicle device 19. Has been.

  The control circuit 3 has a function of controlling the overall operation of the in-vehicle system 2 and is configured by a normal computer (for example, a microcomputer). The control circuit 3 has functions as request means and sound field adjustment means according to the present invention.

The position detector 4 includes a geomagnetic sensor 13, a gyroscope 14, a distance sensor 15, and a GPS (Global Positioning System) receiver 16. The position detector 4 is configured to detect the current position of the vehicle while interpolating with each other by the four sensors 13 to 16, and has a highly accurate position detection function. The map data input device 5 is constituted by a reading device capable of reading a CD-ROM, DVD-ROM, HDD, or the like, and inputs various data such as map data, map matching data, and voice recognition dictionary data. It is a device.
The operation switch group 5 includes a touch switch (touch panel) provided on the upper surface of the display screen of the display 8 and a mechanical push switch (not shown) provided in the periphery of the display 8. .

The external memory 7 is constituted by a reading device such as a memory card, and is a device for inputting map data, music data, video data, and the like. The display 8 is composed of, for example, a color liquid crystal display for displaying various screens. The voice recognition device 9 is a device that recognizes a voice input through the voice circuit unit 12. The vehicle interface unit 10 is an input / output device connected to an in-vehicle LAN (not shown).
The Bluetooth communication unit 11 has a function as a short-range wireless communication unit having a short-range wireless communication function compliant with the Bluetooth communication standard, and an external device having a wireless communication function compliant with the same standard (for example, This is a device that enables wireless communication connection with a mobile phone 50).

  The control circuit 3 has a function of automatically calculating and setting an optimum route from the current position (departure point) to the destination when the user operates the operation switch group 6 to set the destination. . Although not shown, a remote controller can be connected to the in-vehicle system 2, and when this remote controller is operated, the operation signal is given to the control circuit 3 via a remote controller sensor (not shown).

  The audio circuit unit 12 is connected to a microphone unit 17 and a plurality of speakers 18a to 18d. The audio circuit unit 12 is a circuit having a function for inputting sound from the microphone unit 17 and outputting sound from the speaker 17. FIG. 2 schematically shows the installation location of the microphone and the speaker and the detailed block configuration of the audio circuit unit.

  As shown in FIG. 2, the microphone unit 17 is fixedly installed with respect to the headrest portion A1a of the driver seat A1 in the automobile C. The speakers 18a to 18d are arranged at four front and rear, right and left corners in the automobile C, and output sound toward the seats A1 to A3 in the passenger compartment of the automobile C. Further, the Bluetooth communication unit 11 is disposed in the front part of the automobile C and can perform near field communication with the mobile phone 50 located in the vicinity.

  The control circuit 3 and the Bluetooth communication unit 11 are disposed in the center console in the automobile C. The audio circuit unit 12 includes an interface unit 19, an audio processing unit 20, a phase control unit 21, an equalizer adjustment unit 22, an amplitude phase detection unit 23, an interface unit 24, a plurality of phase adjustment circuits 25a to 25d, and a plurality of equalizers 26a to 26a. 26d. In the audio circuit unit 12, a plurality of amplifiers 27a to 27d may be provided as components corresponding to the speakers 18a to 18d as necessary.

  An audio processing unit 20, a phase control unit 21, an equalizer adjustment unit 22, and an amplitude / phase detection unit 23 are connected to the control circuit 3 through an interface unit 19. The sound processing unit 20 receives a control signal from the control circuit 3 based on the reference sound source data (test sound data) stored in the sound source storage unit 20a, and outputs sound signals to the phase adjustment circuits 25a to 25d. Supply. The sound source storage unit 20a stores reference sound source data (for example, sound source data of a single frequency sound) so that the gain frequency characteristics of the microphone unit 51 (corresponding to sound input means) of the mobile phone 50 can be easily measured. Has been.

  The phase control unit 21 receives the control signal from the control circuit 3 and controls the degree of phase change by the phase adjustment circuits 25a to 25d. The equalizer adjusting unit 22 receives the control signal from the control circuit 3 and adjusts the filtering characteristics for each predetermined frequency band by the equalizers 26a to 26d. The amplitude phase detection unit 23 detects the amplitude and phase of the sound signal input to the microphone unit 17 and transmits this data to the control circuit 3 through the interface unit 19. The control circuit 3 can compare the amplitude and phase detected by the amplitude / phase detection unit 23 with the amplitude and phase of the sound signal input to the microphone unit 51 transmitted from the mobile phone 50 as necessary. It has become. As will be described later, this is for adjusting the sound field near the location where the mobile phone 50 is present.

  When the sound processing unit 20 supplies a sound signal to the phase adjustment circuits 25a to 25d, the gain of the sound signal is increased or decreased for each predetermined frequency band of the sound band by the phase adjustment circuits 25a to 25d and the equalizers 26a to 26d. At the same time, the sound is output from the speakers 18a to 18d after the phase is adjusted and amplified by the amplifiers 27a to 27d. The phase adjustment circuits 25a to 25d and the phase adjustment circuits 25a to 25d are individually provided corresponding to the speakers 18a to 18d.

Hereinafter, the electrical configuration of the mobile phone 50 will be described with reference to FIG.
The cellular phone 50 includes a control circuit 52 configured by, for example, a microcomputer, a microphone unit 51 connected to the control circuit 52, a speaker 53, a Bluetooth communication unit 54 as a short-range wireless communication unit, a display unit 55, and wireless communication. A unit 56, an operation switch group 57, and a memory 58 are provided. The microphone unit 51 and the speaker 53 are configured to achieve a transmission / reception function by inputting and outputting sound. The microphone unit 51 is constituted by a capacitor microphone, for example. The wireless communication unit 56 is configured to enable wireless communication with a mobile phone base station (not shown), and is hardware for achieving a voice transmission / reception function, a data transmission / reception function such as an electronic mail, and the like. The control circuit 52 functions as a measurement unit and a transmission unit.

  Similarly to the Bluetooth communication unit 11, the Bluetooth communication unit 54 is a wireless communication unit configured to be able to realize wireless communication compliant with the Bluetooth standard, and a wireless communication device compliant with the Bluetooth standard installed outside Are configured to be able to communicate with each other. The operation switch group 57 is a switch configured to be operable by a user. The display unit 55 is composed of, for example, a liquid crystal display, and has a function of receiving a control signal from the control circuit 52 and displaying a response when the operation switch group 57 is operated by a user, and at the time of transmission / reception. The other party's phone number and the contents of the e-mail are displayed. With this configuration, the control circuit 52 achieves voice communication and data communication functions as a mobile phone, and also achieves a short-range wireless communication function based on the Bluetooth standard.

  FIG. 3 shows the relationship between the gain frequency characteristic of the microphone unit 17 installed in the headrest part A1a of the driver's seat A1 in the car C and the gain frequency characteristic of the microphone unit 51 provided in the mobile phone 50. As shown in FIG. 4, the microphone unit 51 of the mobile phone 50 has a narrower bandwidth and a lower overall gain than the gain frequency characteristic of the microphone unit 17 installed in the automobile C.

  Therefore, the memory 58 in the mobile phone 50 stores a correction table T for correcting this frequency characteristic. FIG. 5 shows an example of the correction table T. In this correction table T, a mobile phone 3 serving as a reference is installed in the vicinity of the microphone unit 17 in the car C, and the frequency characteristics of the known microphone unit 17 and the microphone unit built in the mobile phone 50 are included. 5 is a table showing gain frequency characteristic differences created in advance based on the results of comparison with 51 frequency characteristics. Note that data indicating the phase difference between the microphone unit 17 and the microphone unit 51 may be added to the correction table T. In the automobile C, not only the speakers 18a to 18d having the same characteristics, but also a woofer may be installed at the rear part of the automobile C, for example, although not shown.

  For example, as shown in FIG. 3, the gain difference between the microphone unit 17 fixedly installed on the headrest unit A1a and the microphone unit 51 of the mobile phone 50 is + AdB at a frequency of 100 Hz, + BdB at a frequency of 2 kHz, and + CdB at a frequency of 10 kHz. Sometimes, the memory of the mobile phone 50 stores these pieces of information as a correction table T as shown in FIG. When such a correction table T is stored in advance in the memory 58 of the mobile phone 50, the correction process can be performed quickly.

The operation of the above configuration will be described with reference to FIGS.
FIG. 5 shows a sequence diagram between the mobile phone 50 and the in-vehicle system 2. FIG. 6 shows a processing operation of the control circuit 3 of the in-vehicle system in a flowchart, and FIG. 7 shows a processing operation of the control circuit 52 of the mobile phone in a flowchart.

  As shown in FIGS. 5 to 7, the in-vehicle system 2 and the mobile phone 50 perform communication processing after establishing a wireless communication link through the Bluetooth communication units 11 and 54. As shown in FIG. 6, the in-vehicle system 2 side determines whether or not the wireless communication link by the Bluetooth communication unit 54 has been established (step S1), and will be described later on condition that the wireless communication link has been established. Processing of ~ S5 is performed. However, if the wireless communication link by the Bluetooth communication unit 54 has not been established on the in-vehicle system 2 side (step S1: NO), it is determined whether or not the wireless communication link is instantaneously disconnected (step S7). When it is determined that the state has not elapsed for a predetermined time (step S9: YES), or when it is determined that the state is not an instantaneous disconnection state (step S7: NO), initial sound field parameters are set (step S8), The sound circuit unit 20 adjusts the sound field in the automobile C that is output from the speakers 18a to 18d. The initial sound field parameter at this time is a parameter that represents the frequency characteristic of the initialized sound, and is a parameter that is determined in advance in consideration of the acoustic environment in the passenger compartment of the automobile C.

  On the other hand, as shown in FIG. 7, on the mobile phone 50 side, the control circuit 52 determines whether or not the sound field adjustment software and profile are installed (step T1). This is performed in order to determine whether or not the sound field adjustment request function is incorporated on the mobile phone 50 side. Further, the control circuit 52 determines whether or not the wireless communication link by the Bluetooth communication unit 11 is established (step T2). On condition that the conditions of these steps T1 and T2 are satisfied, a sound field adjustment request signal is transmitted to the in-vehicle system 2 (step T3), and in particular at step T2 until this request signal is transmitted. It is determined whether or not the wireless communication link by the Bluetooth communication device 54 is continued.

  As shown in FIG. 5, on the mobile phone 50 side, when the sound field adjustment command button provided in the operation switch group 57 is turned on (step U1), the control circuit 52 receives the operation signal and adjusts the sound field. A request signal is transmitted to the in-vehicle system 2 through the Bluetooth communication unit 54 (step U2). On the in-vehicle system 2 side, it is determined whether or not the sound field can be adjusted (step U3). If the sound field cannot be adjusted, a sound field adjustment disapproval signal is transmitted (step U4). In this case, the process ends on the mobile phone 50 side (step U5).

As shown in FIG. 6, when the in-vehicle system 2 receives the sound field adjustment request signal from the mobile phone 50 in step S2, a test sound having a single frequency is transmitted for each speaker among the speakers 18a to 18d (step S2). S3). Thereafter, on the in-vehicle system 2 side, a request signal for the measurement data of the test sound transmitted from the speakers 18a to 18d is transmitted to the mobile phone 50 (step S4 in FIG. 6: step U6 in FIG. 5). And it waits until measurement data are transmitted from the mobile telephone 50 (step S5).
As shown in FIG. 7, when a measurement data request signal is transmitted from the in-vehicle system 2 on the mobile phone 50 side, the measurement data request signal is received in step T <b> 4 to correct the microphone unit 51 of the mobile phone 50. It is determined whether or not the table is stored (step T5).

  At this time, if it is determined that the correction table T of the microphone unit 51 of the mobile phone 50 is stored on the mobile phone 50 side, the control circuit 54 of the mobile phone 50 uses the built-in microphone unit 51. Then, the gain frequency characteristic and the phase frequency characteristic corresponding to the sound pressure level are measured (step T6), and the measurement data is transmitted as a response signal to the in-vehicle system 2 (step T7 in FIG. 7: step U7 in FIG. 5). These processes are continued until all the reference test sounds from the speakers 18a to 18d are measured on the mobile phone 50 side (step T8). Thereafter, on the in-vehicle system 2 side, on the condition that the measurement data is received (step S5: YES), a new sound field parameter is set (step S6 in FIG. 6), and the sound field is adjusted. The adjustment setting is changed so that the location where the mobile phone 50 is located is virtually located at the center of the sound field (step U8 in FIG. 5), and a setting change completion signal is transmitted to the mobile phone 2 side (FIG. 5). Step U9). Thereby, an accurate sound image localization and a correct composite waveform can be obtained at the place where the mobile phone 50 is located.

  A case will be described where it is determined in step T5 in FIG. 7 that the correction table of the microphone unit 51 of the mobile phone 50 is not stored. If the correction table is not stored, it is difficult to perform performance correction. The microphone unit 51 of the mobile phone 50 can measure the phase difference of the sounds emitted from the speakers 18a to 18d and the difference between the relative sound pressure levels, but cannot correct the gain frequency characteristic. Therefore, processing is performed as follows.

  On the mobile phone 50 side, for example, when a speaker (not shown) having a good low sound characteristic such as a woofer is installed in the car C in addition to the speakers 18a to 18d having the same characteristic, the sound field by the low sound speaker is set. There is a need to. At this time, if a woofer is installed, the passenger carrying the mobile phone 50 sits in a predetermined seat, and the passenger presses the sound field adjustment command button of the mobile phone 50 while sitting in this seat. When turned on, sound is output from the bass speaker. The passenger manually adjusts the volume while listening to the sound output from the bass speaker by operating the cellular phone 50 possessed by the passenger. Instead of this manual adjustment, the difference between a predetermined sound pressure level and phase correction amount for the driver's seat A1 from the rear speakers 18c to 18d and the current sound pressure level and phase correction amount is used. You may comprise so that a difference may be applied as a correction amount of the woofer installed only in the rear part.

  When the speakers 18a to 18d have the same characteristics, the gain and phase characteristics are measured using a predetermined volume output at a predetermined single frequency (for example, 2 kHz) from the speakers 18a to 18d, and used as a reference correction. Data is prepared (step T9).

  The mobile phone 50 side measures the gain / phase frequency characteristics while correcting the gain / phase frequency characteristics using the reference correction data (step T10), and transmits the measurement data to the in-vehicle system 2 ( In step T11), it is confirmed that the measurement of each of the speakers 18a to 18d has been completed (step T12), and the process ends.

  Conventionally, sound pressure level correction and phase correction have been performed based on a sound signal input to a microphone portion 17 fixedly installed on the headrest portion A1a of the driver seat A1. However, the optimum sound field correction can be performed only for the driver's seat A1, and the rear seat cannot be adjusted to the optimum sound field when the passenger gets on, for example, a taxi.

  According to the present embodiment, the in-vehicle system 2 requests measurement data (gain frequency characteristics (sound pressure level) and phase frequency characteristics) regarding the test sound input to the microphone unit 51 of the mobile phone 50, and the mobile phone 50. When the measurement data corresponding to the test sound is transmitted as a response signal, the sound signal is adjusted by the phase adjustment circuit 25 and the equalizers 26a to 26d based on the measurement data related to the test sound, and the speakers 18a to 18d via the amplifiers 27a to 27d. Output sound.

  In this case, since the sound field is adjusted in a state corrected by the correction table T stored in the mobile phone 50, the characteristic difference of the microphone unit 51 can be eliminated and adjustment can be performed. Further, since the frequency characteristics of the microphone unit 17 installed in the automobile C and the frequency characteristics of the microphone unit 51 of the mobile phone 50 are compared and corrected by the correction table T obtained as a result of the comparison, The sound field can be provided by taking into account the difference in characteristics of the microphone. At this time, the gain frequency characteristic (sound pressure level) and the phase frequency characteristic are corrected based on the sound signal input to the microphone part 17 fixedly installed on the headrest part A1a, and an appropriate sound field is provided in the vicinity of the driver seat A1. In addition, the gain frequency characteristic (sound pressure level) and the phase frequency characteristic are corrected based on the sound signal input to the microphone unit 51 of the mobile phone 50, and other seats (auxiliary seat A2, rear seat A3) are corrected. An appropriate sound field can be provided to the vicinity.

(Second Embodiment)
FIG. 8 shows a second embodiment of the present invention. The difference from the first embodiment is that the configuration of the microphone unit of the mobile phone 50 is changed in place of the correction table T, and the microphone characteristic difference is changed. It is in the place where it was made to cancel. The same parts as those in the first embodiment are denoted by the same reference numerals, and only different parts will be described below.

  FIG. 8 shows a configuration of a microphone unit 60 that replaces the microphone unit 51 in the mobile phone 50. The microphone unit 60 includes a microphone 61 for inputting sound, a filter circuit 62 as a filter means for limiting the output signal of the microphone 61 to a predetermined bandwidth, and an amplifier 63 connected to the output of the filter circuit 62. And a switch circuit 64 as a bypass means for bypassing the input / output of the filter circuit 62. The control terminal of the switch circuit 64 is connected to the control circuit 52 of the mobile phone 50, and the switch circuit 64 is configured to be able to open and close the switch circuit by a control signal from the control circuit 52. As shown in FIG. 3, the microphone unit 60 of the mobile phone 50 has a bandwidth characteristic of about several hundred kHz to several kHz, and this characteristic is almost the characteristic of the filter circuit 62. Accordingly, when the test sound is input, when the control circuit 52 switches the switch circuit 64 so as to bypass the filter circuit 62, the control circuit 52 almost matches the frequency characteristic of the microphone unit 17 of the in-vehicle system 2. As a result, the correction process can be performed quickly with a simple configuration.

(Other embodiments)
The present invention is not limited to the above embodiment, and for example, the following modifications or expansions are possible.
The microphone unit 17 may be installed as necessary. Although the embodiment in which the correction table T is stored in the memory 58 of the mobile phone 50 is shown, the present invention is not limited to this. For example, the correction table T is stored in the control circuit 3 of the in-vehicle system 2 or in the external memory 7. May be.
Although the embodiment in which the speakers 18a to 18a are provided together with a low-frequency speaker such as a woofer is shown, the present invention is not limited to this, and any form may be provided as long as a plurality of speakers are provided.

Schematic system configuration diagram in the first embodiment of the present invention The figure which shows schematically the arrangement state of the speaker in a vehicle interior, and the block configuration of an audio | voice circuit part The figure which shows roughly the gain frequency characteristic of the microphone part installed in the vehicle interior, and the gain frequency characteristic of the microphone part of the mobile phone The figure which shows an example of the table for correction | amendment Sequence diagram showing communication status between in-vehicle system and mobile phone Flow chart showing processing operation of in-vehicle system Flow chart showing processing operation of mobile phone The circuit block diagram of the microphone part of the mobile telephone which shows the 2nd Embodiment of this invention

Explanation of symbols

  In the drawings, 1 is a vehicle interior sound field adjustment system, 2 is an in-vehicle system, 3 is a control circuit (request means, sound field adjustment means), 11 is a Bluetooth communication unit (short-range wireless communication means), and 17 is a microphone unit (vehicle). Room sound input means), 18a to 18d are speakers (sound output means), 19 is an in-vehicle device, 51 is a microphone part (sound input means), 50 is a mobile phone (mobile terminal), and 54 is a Bluetooth communication part (short-range wireless). (Communication means) and 64 are switch circuits (bypass means).

Claims (5)

Sound output means for outputting sound to the passenger compartment;
Vehicle interior sound input means for inputting sound in the vehicle interior;
An in-vehicle system comprising: an in-vehicle device;
The in-vehicle device is
A second short-range wireless communication means configured to be capable of short-range wireless communication with the portable terminal including the first short-range wireless communication means and the sound input means ;
And request means for requesting through the first and second short-range wireless communication unit measurement data and a sound pressure level and the phase frequency characteristics of the sound input to the sound input unit with respect to the front Symbol mobile terminal,
From the mobile terminal requested by previous SL request means of said sound output means based on the measured data of the transmitted the sound as a response signal via the measurement data of the first and second short-range wireless communication means of the sound An in-vehicle system comprising sound field adjusting means for adjusting a sound field for sound output. The in- vehicle system according to claim 1, wherein a plurality of the sound output means having different sound frequency characteristics are provided in the vehicle interior.   A vehicle interior sound field adjustment system comprising an in-vehicle device mounted on a vehicle and a portable terminal possessed by a passenger of the vehicle,
  The portable terminal is
  A first short-range wireless communication means capable of short-range wireless communication with the in-vehicle device;
  Sound input means for inputting external sound;
  Measuring means for measuring measurement data including the sound pressure level and phase frequency characteristics of the sound input to the sound input means;
  A control circuit having correction means for correcting the measurement data measured by the measurement means according to the frequency characteristics of the sound input means,
  When the measurement data of the sound input to the sound input means is configured to be transmitted through the short-range wireless communication means, and a correction table for correcting the frequency characteristics of the sound input means is stored in the memory When the measurement data measured by the measuring means is corrected by the control circuit based on the correction table and transmitted to the in-vehicle device, and the correction table is not stored in the memory, the vehicle of the vehicle A correction table is created by receiving the signal output from the sound output means provided in the room by the sound input means of the mobile phone, and the measurement data measured by the measurement means based on the correction table Is corrected and transmitted to the in-vehicle device,
  The in-vehicle device is
  A second short-range wireless communication means capable of short-range wireless communication with the portable terminal;
  The sound output means for outputting sound to the passenger compartment is input with the sound input means, and the measurement data of the input sound is requested to the portable terminal through the second short-range wireless communication means. Requesting means, and
  When the sound measurement data is transmitted from the portable terminal as a response signal through the short-range wireless communication means in response to the request by the request means, the sound field of the sound output means is output based on the sound measurement data. A vehicle interior sound field adjustment system comprising a sound field adjustment means for adjusting the sound field.   Sound input means for inputting external sound;
  Short-range wireless communication means configured to be capable of short-range wireless communication according to a predetermined wireless communication standard;
  Measuring means for measuring measurement data including the sound pressure level and phase frequency characteristics of the sound input to the sound input means;
  Transmitting means for transmitting the measurement data as a response signal to the outside through the short-range wireless communication means when the measurement data of the measurement means is requested from the outside;
  A memory for storing a correction table set corresponding to the plurality of predetermined frequencies with respect to characteristic differences at a plurality of predetermined frequencies in a frequency band in which sound can be input to the sound input unit;
  A correction unit configured to correct the frequency according to the frequency characteristics of the sound input unit, and when the correction table is stored in the memory, the measurement data measured by the measurement unit is converted into the correction table by the control circuit; When the correction table is not stored in the memory, the signal output from the sound output means provided in the passenger compartment of the vehicle is transmitted to the in-vehicle device. A control circuit that creates a correction table by receiving the sound input means, corrects the measurement data measured by the measurement means based on the correction table, and transmits the correction data to the in-vehicle device;
  A portable terminal characterized by comprising:   The control circuit includes a filter unit that configures a frequency band in which sound can be input to the sound input unit, and a bypass unit that bypasses the filter unit.
  The mobile terminal according to claim 4, wherein a frequency characteristic difference of the sound input unit is corrected.

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