JP2017171095A - Vehicular notification system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular notification system that can suppress occurrence of acoustic echo even if a condition set by an occupant is varied.SOLUTION: The vehicular notification system is an emergency notification device 10 for communication with a vehicle exterior notification device, which comprises: a sound processing portion 30 that receives transmission signals picked up by a microphone 16 and generates audio output by outputting reception signals received from the vehicle exterior notification device to a speaker 17; and a control portion 11 that controls the sound processing portion 30. The sound processing portion 30 has an echo canceller circuit 31 and an echo suppressor circuit 35 which have acoustic echo removal characteristics which can be set according to predetermined control parameters (G, D and K), which remove at lest acoustic echo components included in the transmission signals. The control portion 11 sets the acoustic echo removal characteristics by correcting the control parameters, according to states of a vehicle including at least a position of an occupant 6 on a driver seat 60 with respect to the microphone 16 and the speaker 17.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicular call system, and more particularly to a vehicular call system in which a vehicle occupant can make a hands-free call with an external operator.

  Conventionally, there has been proposed a sound input control device in which a vehicle occupant can make a hands-free call with the outside (see, for example, Patent Document 1). In the device described in Patent Document 1, in an emergency (for example, at the time of a collision), the occupant can make a hands-free call, and the voice uttered by the occupant is collected by a microphone installed near the vehicle ceiling. It is like that.

  In Patent Document 1, an array microphone that can control the sound input directivity is adopted as the microphone. The sound input directivity of the microphone is appropriately controlled in normal times and in an emergency, so that the sound emitted by the occupant can be obtained. It is configured to be able to collect sound.

JP 2014-175696 A

  However, the array microphone is expensive, and even if the sound input directivity is appropriately controlled according to the situation, the occupant's voice cannot be reliably collected. The present inventor has also found that an acoustic echo may be generated from the speaker when the position or posture of the occupant changes during a call in an emergency or the like. In particular, in an emergency in which a collision or the like occurs, the driver's posture may be different from the normal time, and it is required to suppress acoustic echo in a call in an emergency.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a vehicle notification system capable of suppressing the generation of acoustic echoes even when conditions caused by occupants change. It is said.

  In order to achieve the above object, the present invention provides a vehicular call system for making a call with an off-vehicle call device, which receives a transmission signal collected by a microphone arranged in the vehicle, and calls outside the vehicle. A sound processing unit that outputs a reception signal received from the device to a speaker disposed in the vehicle to generate a sound output; and a control unit that controls the sound processing unit, the sound processing unit having predetermined control parameters An echo canceling unit having acoustic echo canceling characteristics that can be set by the control unit. The echo canceling unit is configured to remove at least an acoustic echo component included in the transmission signal. The control unit includes at least a microphone and a speaker. The acoustic echo cancellation characteristic is set by correcting the control parameter in accordance with the vehicle state including the position of the passenger in the driver's seat.

  According to the present invention configured as described above, at least a transmission signal is transmitted by the echo removing unit of the sound processing unit when an occupant in the vehicle makes a hands-free call with the outside call device using the vehicle call system. The acoustic echo component contained in can be removed. In the present invention, the acoustic echo removal characteristic of the echo removal unit is configured to be changed according to the position of the driver's occupant. Conventionally, if the position of the occupant who is the speaker changes, the positional relationship between the microphone and the speaker that is fixedly arranged in the vehicle and the occupant greatly changes. Even if the removal characteristics are finely adjusted, it is difficult to sufficiently remove the acoustic echo component. However, in the present invention, the acoustic echo component can be efficiently removed according to the vehicle state including the position of the occupant by changing the acoustic echo removal characteristic according to the control parameter according to at least the position of the occupant.

In the present invention, it is preferable to further include a control parameter table in which parameter values of control parameters are set corresponding to the position of the driver's seat occupant, and the control unit controls the control parameter table according to the position of the driver's occupant. The control parameter is corrected by selecting the corresponding parameter value from.
According to the present invention configured as described above, by using a control parameter table in which control parameters are set in advance according to the position of the occupant, the control parameter can be corrected by a simple process according to the position of the occupant. Can do.

  Specifically, the control unit can determine the position of the occupant in the driver seat based on a seat position signal received from a seat position sensor that detects the seat slide position of the driver seat.

Preferably, in the present invention, the vehicle state includes an attitude of the driver's seat occupant, and the control unit is configured to detect the occupant of the driver's seat based on image data of the occupant received from the in-vehicle camera that images the driver's occupant. The posture is determined, and the control parameter is corrected according to the determined posture of the occupant of the driver seat.
According to the present invention configured as described above, the acoustic echo canceling characteristic is more effectively corrected by correcting the control parameter in accordance with the position of the occupant and the posture of the occupant affecting the generation of the acoustic echo. Can be optimized.

In the present invention, it is preferable that the vehicle state includes an opening / closing position of the vehicle window, and the control unit determines the opening / closing position of the vehicle window based on a window position signal received from a window position sensor that detects the opening / closing position of the vehicle window. The control parameter is corrected according to the determined opening / closing position of the vehicle window.
According to the present invention configured as described above, the acoustic echo is more effectively corrected by correcting the control parameter according to the opening / closing position of the vehicle window that affects the generation of the acoustic echo in addition to the position of the occupant. The removal characteristics can be optimized.

  Preferably, in the present invention, the echo canceller includes an echo canceller circuit, the echo canceller circuit generates a pseudo echo signal by multiplying the received signal by a predetermined gain, and determines a predetermined value from the sound emission timing of the received signal. It is configured to subtract the pseudo echo component from the transmission signal after the delay time, and the control unit corrects the magnitude of the gain and the length of the delay time as control parameters.

  Preferably, in the present invention, the echo removing unit includes an echo suppressor circuit, and the echo suppressor circuit includes an attenuation unit that attenuates at least a transmission signal or a reception signal by a predetermined attenuation amount, and the control unit includes a control parameter. As shown in FIG.

  ADVANTAGE OF THE INVENTION According to this invention, even if the conditions resulting from a passenger | crew change, the notification system for vehicles which can suppress generation | occurrence | production of an acoustic echo can be provided.

It is explanatory drawing of the emergency call system of embodiment of this invention. It is an electrical block diagram of the emergency call apparatus of embodiment of this invention. It is explanatory drawing which shows arrangement | positioning of the relevant unit of the emergency call apparatus of embodiment of this invention. It is explanatory drawing of the sound processing part of the emergency call apparatus of embodiment of this invention. It is explanatory drawing of the control parameter table of the emergency call apparatus of embodiment of this invention. It is a processing flow of the control parameter selection process of the emergency call apparatus of embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The vehicle call system of the present invention is a call system for performing a hands-free call with an outside call device. In the following embodiment, an example applied to an emergency call device mounted on a vehicle will be described.

First, with reference to FIGS. 1-3, the outline | summary of the emergency call system and emergency call apparatus of embodiment of this invention is demonstrated. FIG. 1 is an explanatory diagram of an emergency call system, FIG. 2 is an electrical block diagram of the emergency call device, and FIG. 3 is an explanatory view showing an arrangement of related units of the emergency call device.
As shown in FIG. 1, a vehicle 1 equipped with an emergency call device 10 is a call device of an emergency call center 2 via an base station 3 and a communication line network 4 in an emergency (for example, a vehicle collision or a passenger's sudden illness). A communication line can be established with the (external communication device). The vehicle 1 acquires the current position information of the own vehicle using the GPS satellite 5, and performs data communication of the current position information, the vehicle identification information, and the like via the established communication line. In addition, a voice call can be made between the passenger and the operator of the emergency call center 2. Thereby, necessary measures such as arrangement of an ambulance can be quickly performed via the emergency call center 2.

  As shown in FIG. 2, the emergency notification device 10 includes a control unit 11, a positioning module 12, a wireless communication processing unit 13, a storage unit 14, a manual notification switch 18, an auxiliary battery 19, and a power supply unit 20. The sound processing unit 30 is provided. The emergency call device 10 is connected to a microphone 16, a speaker 17, a seat position sensor 40, an in-vehicle camera 41, a window position sensor 42, and the like.

The control part 11 is comprised, for example by CPU etc., and responds to a vehicle emergency signal, and performs the emergency call process demonstrated below.
The positioning module 12 receives a GPS signal from the GPS satellite 5 and acquires current position information. The wireless communication processing unit 13 performs wireless communication (data communication and voice communication) with the emergency call center 2 via the base station 3 and the communication line network 4. The storage unit 14 stores vehicle identification information, a communication address (telephone number) of the emergency call center 2, a control parameter table 14a described later, and the like.

  The sound processing unit 30 is connected to the microphone 16 and the speaker 17 arranged at predetermined positions in the vehicle, and processes the audio signal when the occupant talks with the operator of the emergency call center 2. Specifically, the sound processing unit 30 collects the sound uttered by the occupant 6 of the driver's seat 60 with the microphone 16 and receives the sound signal (transmission signal). The emergency call device 10 transmits this transmission signal to the emergency call center 2. On the other hand, the sound processing unit 30 inputs the voice signal (received signal) received from the emergency call center 2 to the speaker 17 and outputs it as voice. The sound processing unit 30 is configured to execute an acoustic echo removal process for removing an acoustic echo component from the audio signal.

  The microphone 16 is fixedly attached to a specified position above the driver's seat 60 in the passenger compartment, and directivity is set so as to mainly collect the sound emitted by the occupant 6 (see FIG. 3). The speaker 17 is fixedly attached to a specified position of the instrument panel in front of the driver's seat 60 in the passenger compartment, and is set to emit sound mainly toward the occupant 6 (see FIG. 3). .

  The manual notification switch 18 is configured to be able to input a vehicle emergency signal to the control unit 11 when operated by the occupant when it becomes necessary to report to the emergency notification center 2 due to a sudden illness of the occupant.

The auxiliary battery 19 is a primary battery, and is not always used, and can function as a power source for emergency notification processing or the like only for a predetermined period in place of the external power source when the external power source is lost.
The power supply unit 20 is connected to a vehicle battery 54 mounted on the vehicle 1. The power supply unit 20 is normally supplied with power from the vehicle battery 54, and receives the control unit 11, the positioning module 12, the wireless communication processing unit 13, and the storage unit 14. , A predetermined power is supplied to the sound processing unit 30 and the like.

  The emergency call device 10 is connected to an in-vehicle communication line 50 (for example, CAN which is an in-vehicle LAN; Local Area Network) via an interface circuit (not shown). Various ECUs in the vehicle 1 are connected to the in-vehicle communication line 50, and these ECUs transmit and receive communication data via the in-vehicle communication line 50. For example, the airbag ECU 55 is connected to the in-vehicle communication line 50.

  The airbag ECU 55 includes a vehicle collision detection sensor that detects a collision of the vehicle 1 using an acceleration sensor or the like (not shown), and is configured to deploy the airbag in a predetermined manner when a vehicle collision is detected. . At this time, the airbag ECU 55 transmits a collision detection signal, which is a vehicle emergency signal, via the in-vehicle communication line 50. The emergency notification device 10 can read a collision detection signal on the in-vehicle communication line 50 as a vehicle emergency signal.

  The emergency call device 10 executes an emergency call process in response to receiving the vehicle emergency signal. Specifically, the control unit 11 establishes a communication line between the emergency call center 2 having the communication address stored in the storage unit 14 and the vehicle 1 via the wireless communication processing unit 13 and stores predetermined data. While performing communication (current position information, vehicle identification information, etc.), voice communication with the emergency call center 2 is enabled. For example, when the operator of the emergency call center 2 on-hooks the telephone and the communication line is disconnected, the emergency call with the emergency call center 2 ends.

  The seat position sensor 40 detects the seat slide position of the vehicle seat including the driver's seat 60 and transmits a seat position signal Ss representing the seat slide position to the emergency notification device 10. The vehicle seat is arranged to be slidable on the seat rail 61 arranged on the floor panel of the vehicle 1 in the vehicle front-rear direction. The seat slide position is specified by a distance x from the front end position of the seat rail 61 (see FIG. 3).

The in-vehicle camera 41 is arranged in the passenger compartment so as to image the occupant 6 seated in the driver's seat 60 (see FIG. 3), and transmits image data Si including the occupant 6 to the emergency call device 10.
The window position sensor 42 detects the opening / closing position of the window glass that can be opened / closed of the vehicle 1, and transmits a window position signal Sw representing the opening / closing position to the emergency notification device 10.

Next, with reference to FIG.4 and FIG.5, the sound processing part of the emergency call apparatus of this embodiment is demonstrated. 4 is an explanatory diagram of a sound processing unit, and FIG. 5 is an explanatory diagram of a control parameter table.
First, acoustic echo will be briefly described. When the occupant 6 makes a hands-free call with the operator of the emergency call center 2, the operator's voice is emitted from the speaker 17, but a part of the voice circulates to the microphone 16 as an acoustic echo component and passes through the same transmission path. Then, it can return to the operator side (see FIG. 4). Similarly, the voice of the occupant 6 can be returned via the operator side. The returned voice is delayed as compared with the voice of the speaker, and is detected as an acoustic echo. The sound processing unit 30 of the present embodiment includes an echo removal unit (that is, an echo canceller circuit 31 and an echo suppressor circuit 35) having a predetermined acoustic echo removal characteristic in order to remove or reduce such acoustic echo. .

  In principle, the echo canceller circuit 31 is configured to remove the acoustic echo component by subtracting the pseudo echo signal generated with reference to the received signal from the transmitted signal. For this reason, the echo canceller circuit 31 includes a pseudo echo generator 32 and a subtractor 33.

  The pseudo echo generation unit 32 generates a pseudo echo signal by multiplying the reception signal by a predetermined gain G, and sends the reception signal to the subtracter 33 after a predetermined delay time D from the timing when the reception signal is emitted by the speaker 17. Output. In other words, the acoustic echo component is a part of the received signal that is reflected in the passenger compartment, so that the acoustic echo component wraps around the microphone 16 with a time delay corresponding to the propagation path and is mixed with the transmitted signal. By multiplying G, a pseudo echo signal in which an acoustic echo component is estimated can be generated. The subtractor 33 subtracts the pseudo echo signal from the reception signal and outputs a reception signal with reduced acoustic echo components. In addition, you may comprise the pseudo echo production | generation part 32 of this embodiment using an adaptive filter.

  The echo suppressor circuit 35 is configured to suppress the generation of acoustic echo components that cannot be removed by the echo canceller circuit 31. In the present embodiment, a two-way call is performed between the occupant 6 and the operator. For this reason, as a call state, there are a double talk state where both the occupant 6 and the operator speak, a single talk state where one of them speaks, and a silent state where both do not speak.

  For example, in a single talk state where only the operator utters or a double talk state (particularly, the operator is louder than the occupant 6), the transmitted signal may include an acoustic echo component. Becomes higher. Therefore, acoustic echo can be suppressed by attenuating the transmission signal by a predetermined gain (attenuation amount). For this reason, the echo suppressor circuit 35 includes a comparison unit 36 and an attenuation unit 37.

The comparison unit 36 is configured to compare the signal levels of the transmission signal and the reception signal, and output an attenuation command to the attenuation unit 37 when the signal level of the reception signal is higher than the signal level of the transmission signal. Has been.
The attenuation unit 37 is configured to attenuate the transmission signal by a predetermined attenuation amount K when receiving an attenuation command from the comparison unit 36.

  In the present embodiment, the attenuating unit is configured to attenuate only the transmission signal, but may be configured to attenuate both the transmission signal and the reception signal. For this reason, in addition to the transmission side attenuation unit 37, a reception side attenuation unit can be provided. In this case, for example, when the comparison unit determines that the signal level of the transmission signal is higher than the signal level of the reception signal, the reception-side attenuation unit attenuates the reception signal by the attenuation amount K. be able to.

  In the present embodiment, the sound processing unit 30 is configured to process the transmission signal with the echo canceller circuit 31 and then with the echo suppressor circuit 35. However, the present invention is not limited to this. The circuit 35 may be configured to process the transmission signal.

  The control unit 11 outputs the gain G and delay time D, which are control parameters of the echo canceller circuit 31, and the attenuation amount K, which is a control parameter of the echo suppressor circuit 35, to the sound processing unit 30. Specifically, the control unit 11 stores the seat position signal Ss of the driver's seat 60 from the seat position sensor 40, the image data Si of the occupant 6 from the in-vehicle camera 41, and the window position signal Sw from the window position sensor 42. A control parameter set consisting of gain G, delay time D, and attenuation K is selected from the control parameter table 14 a stored in the unit 14, and the selected control parameter set is output to the sound processing unit 30.

  Even if the microphone 16 and the speaker 17 are arranged at a predetermined fixed position, the inventor generates acoustic echoes depending on the seating position (seat slide position) of the occupant 6, the call posture of the occupant 6, and the open / closed state of the vehicle window. We found that the conditions (transfer functions) changed. For this reason, in the emergency notification device 10 of the present embodiment, the acoustic echo of the sound processing unit 30 depends on the vehicle state, that is, the position, posture, and vehicle environment of the occupant of the driver seat 60 with respect to the microphone 16 and the speaker 17. A control parameter capable of setting the removal characteristic is appropriately corrected or selected for use.

  For example, when the position of the driver's seat 60 changes, the relative positional relationship between the head of the occupant 6, the microphone 16, and the speaker 17 changes, so that the voice of the received signal emitted by the speaker 17 and the voice emitted by the occupant 6 are transmitted. The route is changed. Further, if the position of the head of the occupant 6 and the portion other than the head changes, the sound reflection state changes, and thus the transmission path is similarly affected.

In addition, the position of the occupant 6 (for example, the “normal posture” in which the driver is seated in the driver's seat 60 and the face is facing the front in front of the headrest, the “front posture” in which the head is covered on the steering wheel by a collision, etc. The transmission path is also changed when the upper body slides due to an impact such as “sliding posture” with the face facing the ceiling.
Also, since the sound reflection changes depending on the open / close state of the vehicle window (for example, the door window on the side of the occupant 6), the transmission path is also changed.

  The inventor has optimized the control parameters (G, D, K) in accordance with the difference in the transmission path. That is, for each combination of vehicle state (seat position, driver posture, opening / closing position of the vehicle window), a control parameter set consisting of G, D, and K that is optimal for removing the acoustic echo component is experimentally obtained and controlled. A parameter table 14a was created. Thereby, in this embodiment, an optimized acoustic echo removal characteristic is set by selecting a control parameter set according to the vehicle state and correcting each control parameter of the sound processing unit 30 by the selected control parameter set. can do.

  Therefore, the control parameter table 14a specifies the vehicle state, that is, the seat position, the occupant posture, and the window open / closed state, so that the gain G (Ga to Gr), the delay time D (Da to Dr), and the attenuation K (Ka ˜Kr), the control parameter set (A˜R) can be specified.

  In the present embodiment, the occupant posture is set in three stages: the above-mentioned “normal posture”, “front leaning posture”, and “sliding posture”. The seat position is set in three stages: “front position” (distance x <predetermined threshold S), “middle position” (S ≦ x <predetermined threshold T), and “rear position” (T ≦ x). . The window open / close state is set in two stages: an “open position” in which the window on the passenger 6 side is open even a little, and a “closed position” in which the window is completely closed. In the present embodiment, the variables of each vehicle state are set in two or three stages, but the present invention is not limited to this and may be set in any number of stages (2 to infinite stages).

  In the present embodiment, the open / close state of the vehicle window is adopted as the vehicle environment that affects the acoustic echo generation conditions. However, the present invention is not limited to this, and the noise level inside the vehicle or outside the vehicle by the noise level sensor (engine speed) May be inferred from measured values by sensors and speed sensors), rain level by rain sensors, acceleration fluctuations by accelerometers (for example, estimation of road surface conditions or bad road conditions by acceleration fluctuations), temperature inside the vehicle by temperature sensors The presence or absence of an occupant other than the occupant 6 in the driver's seat 60 by the occupant detection sensor may be added as the vehicle environment.

  Moreover, in this embodiment, although the position of the passenger | crew 6 is simply estimated with the seat position, you may specify other than a seat position. For example, even if the occupant 6 having a different physique is seated even at the same seat position, the position of the head of the occupant 6 can change according to the physique difference. Specifically, the position of the head and upper body in the front-rear direction is different between an occupant whose back is stretched and an occupant who is lying on the back. Further, the position of the head and the upper body in the left-right direction differs between when the occupant 6 is seated in the center of the driver's seat 60 and when the upper body is tilted to the left or right. Therefore, for example, the position of the occupant (left and right position, front and back position) may be determined from the image data captured by the in-vehicle camera 41, and the position of the occupant may be specified.

  In the present embodiment, the control parameter is selected based on the combination of the seat position, the occupant posture, and the window open / closed state as the vehicle state variable. The control parameter may be selected based on one of the combinations, the control parameter may be selected based on one combination of the seat position and the occupant posture or the window open / closed state. You may comprise so that a control parameter may be selected based on any one or arbitrary combinations of a position, a passenger | crew attitude | position, a window opening / closing state, and other vehicle environmental conditions. In such a case, a table corresponding to the variable used as the vehicle state can be newly created as the control parameter table 14a.

Next, with reference to FIG. 6, the control parameter selection process of the emergency call apparatus of this embodiment is demonstrated. FIG. 6 is a process flow of the control parameter selection process.
In the present embodiment, when the emergency call device 10 starts the emergency call process by the input of the vehicle emergency signal, the process of FIG. 6 is executed. This process is repeatedly executed during a voice call by the emergency call process.

  First, the control part 11 detects the attitude | position of the passenger | crew 6 based on the image data Si received from the vehicle-mounted camera 41 (step S10). At this time, the control unit 11 performs image processing on the image data Si, determines the position and orientation of the head of the occupant 6, and the occupant posture is any one of “normal posture”, “front leaning posture”, and “sliding posture”. It is determined whether it is.

  Next, the control unit 11 determines whether the opening / closing position of the vehicle window is the “open position” or the “closed position” based on the window position signal Sw received from the window position sensor 42 ( Step S11). Further, based on the seat position signal Ss received from the seat position sensor 40, the control unit 11 has any one of the “front position”, “middle position”, and “rear position” as the seat slide position of the driver seat 60. Is determined (step S12).

  Next, the control unit 11 selects one control parameter set from the control parameter table 14a on the basis of the occupant posture, the opening / closing position of the vehicle window, and the seat position determined in the processes of steps S10 to S12 (step S13). The process is terminated.

  The control unit 11 outputs the control parameters (G, D, K) of the selected control parameter set to the sound processing unit 30. Thereby, the echo canceller circuit 31 and the echo suppressor circuit 35 of the sound processing unit 30 can execute the echo removal process with the acoustic echo removal characteristic defined by the control parameter according to the vehicle state during an emergency call.

  For example, referring to FIG. 5, when the passenger posture is “normal posture”, the opening / closing position of the vehicle window is “closed position”, and the seat position is “medium position”, the control parameter set E (gain Ge, delay time) De, attenuation Ke) is selected. Therefore, the acoustic echo removal characteristic of the sound processing unit 30 is defined by the control parameter set E.

Next, the operation of the emergency call device according to this embodiment will be described.
In this embodiment, when an occupant 6 in the vehicle makes a hands-free call with the outside call device using the emergency call device 10, the echo removal unit (echo canceller circuit 31, echo suppressor circuit 35) of the sound processing unit 30 is used. Thus, at least the acoustic echo component included in the transmitted signal can be removed. In the present embodiment, the acoustic echo removal characteristic of the echo removal unit is changed according to the position of the occupant 6 of the driver seat 60. Conventionally, if the position of the occupant 6 who is a speaker changes, the positional relationship between the microphone 16 and the speaker 17 fixedly arranged in the vehicle and the occupant 6 changes greatly. Even if the acoustic echo removal characteristics are finely adjusted by the technology, it is difficult to sufficiently remove the acoustic echo component. However, in this embodiment, the acoustic echo component is efficiently removed according to the vehicle state including the position of the occupant by changing the acoustic echo removal characteristics according to the control parameters G, D, and K according to the position of the occupant 6 at least. can do.

  In the present embodiment, the control parameters G, D, K are set according to the position of the occupant 6 by using the control parameter table 14a in which the control parameters G, D, K are set in advance according to the position of the occupant 6. Can be corrected by a simple process.

  For example, the control unit 11 can determine the position of the occupant 6 of the driver seat 60 based on the seat position signal Ss received from the seat position sensor 40 that detects the seat slide position of the driver seat 60.

  Further, in the present embodiment, the acoustic echo is more effectively corrected by correcting the control parameters G, D, and K according to the posture of the occupant 6 that affects the generation of the acoustic echo in addition to the position of the occupant 6. The removal characteristics can be optimized.

  In the present embodiment, in addition to the position of the occupant 6, the control parameters G, D, and K are corrected in accordance with the opening / closing position of the vehicle window that affects the generation of acoustic echoes, so that the acoustics can be more effectively sounded. The echo cancellation characteristics can be optimized.

  In the present embodiment, the echo canceller includes an echo canceller circuit 31. The echo canceller circuit 31 multiplies the received signal by a predetermined gain G to generate a pseudo echo signal, and from the sound emission timing of the received signal. After the predetermined delay time D, the pseudo echo component is subtracted from the transmission signal, and the control unit 11 corrects the magnitude of the gain G and the length of the delay time D as control parameters.

  In the present embodiment, the echo removing unit includes an echo suppressor circuit 35. The echo suppressor circuit 35 includes an attenuation unit 37 that attenuates at least a transmission signal or a reception signal by a predetermined attenuation K, and the control unit 11 Corrects the attenuation K as a control parameter.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Emergency call center 6 Crew 10 Emergency call device 11 Control part 14 Storage part 14a Control parameter table 16 Microphone 17 Speaker 30 Sound processing part 31 Echo canceller circuit 32 Pseudo echo generation part 33 Subtractor 35 Echo suppressor circuit 36 Comparison part 37 Attenuator 40 Seat position sensor 41 Vehicle-mounted camera 42 Window position sensor 50 In-car communication line 60 Driver's seat 61 Seat rail D Delay time G Gain K Attenuation amount Si Image data Ss Seat position signal Sw Window position signal x Distance

Claims (7)

A vehicle call system for making a call with an outside call device,
A sound processing unit that receives a transmission signal collected by a microphone disposed in a vehicle and outputs a reception signal received from an out-of-vehicle communication device to a speaker disposed in the vehicle to generate a sound output; A control unit for controlling the sound processing unit,
The sound processing unit includes an echo removal unit having an acoustic echo removal characteristic that can be set by a predetermined control parameter, and is configured to remove at least an acoustic echo component included in the transmission signal by the echo removal unit. And
The vehicle communication system, wherein the control unit sets the acoustic echo removal characteristic by correcting the control parameter according to a vehicle state including at least a position of a driver's seat occupant with respect to the microphone and the speaker. Further comprising a control parameter table in which parameter values of the control parameters are set corresponding to the position of the driver's occupant,
The vehicle control system according to claim 1, wherein the control unit corrects the control parameter by selecting a corresponding parameter value from the control parameter table in accordance with a position of an occupant in the driver seat.   The vehicle call system according to claim 1, wherein the control unit determines the position of an occupant in the driver seat based on a seat position signal received from a seat position sensor that detects a seat slide position of the driver seat. . The vehicle state includes an occupant posture of the driver seat,
The control unit determines an attitude of the occupant of the driver seat based on an occupant image data received from an in-vehicle camera that images the occupant of the driver seat, and according to the determined attitude of the occupant of the driver seat, The vehicle call system according to any one of claims 1 to 3, wherein the control parameter is corrected. The vehicle state includes an opening / closing position of a vehicle window,
The control unit determines an opening / closing position of the vehicle window based on a window position signal received from a window position sensor that detects an opening / closing position of the vehicle window, and the control parameter is determined according to the determined opening / closing position of the vehicle window. The vehicle call system according to any one of claims 1 to 4, wherein The echo removal unit includes an echo canceller circuit,
The echo canceller circuit generates a pseudo echo signal by multiplying the reception signal by a predetermined gain, and subtracts the pseudo echo component from the transmission signal after a predetermined delay time from the sound emission timing of the reception signal. Is composed of
The vehicle control system according to any one of claims 1 to 5, wherein the control unit corrects the magnitude of the gain and the length of the delay time as the control parameter. The echo removing unit includes an echo suppressor circuit,
The echo suppressor circuit includes an attenuation unit that attenuates at least the transmission signal or the reception signal by a predetermined attenuation amount,
The vehicle call system according to claim 1, wherein the control unit corrects the attenuation amount as the control parameter.

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