JP3644173B2 - Vehicle-mounted telephone device, vehicle-mounted adapter, and mobile phone - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-vehicle telephone device including an in-vehicle adapter and a mobile phone that operates an echo canceller when mounted on the in-vehicle adapter, the in-vehicle adapter, and the mobile phone.
[0002]
[Problems to be solved by the invention]
In recent years, with the widespread use of mobile phones, mobile phones are used not only indoors and on the road but also in automobiles. When the mobile phone is used in an automobile, by attaching the mobile phone to an in-vehicle adapter attached to the inside of the car, a microphone and a speaker for calling can be used, for example, from the mobile phone microphone and the speaker to the in-vehicle adapter microphone and The speaker is switched to a so-called hands-free call.
[0003]
At this time, since the volume output from the speaker of the in-vehicle adapter is large, in order to suppress the echo generated when the sound output from the speaker of the in-vehicle adapter is input to the microphone of the in-vehicle adapter, An echo canceller is provided. That is, during a hands-free call, the echo canceller operates to provide a good call environment in the vehicle.
[0004]
By the way, as one of the factors that determine the characteristics of the echo canceller (for example, the convergence time of the echo), there is an internal variable (filter coefficient) that is used when computation is performed by an adaptive filter in the echo canceller. In other words, the characteristics of the echo canceller depend on internal variables.
[0005]
However, since this internal variable is fixedly set to the adaptive filter, that is, the echo canceller, in the conventional one as described above, for example, the vehicle-mounted adapter is replaced with another vehicle having a different vehicle type (for example, If you try to make a hands-free call with a mobile phone attached to the in-vehicle adapter, even if it was able to provide a good call environment according to the in-vehicle environment before the replacement, it was replaced After that, there was a problem that a good call environment could not be provided.
[0006]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a favorable call environment regardless of the type of vehicle when a hands-free call is made by mounting a mobile phone on an on-vehicle adapter. It is providing a telephone apparatus for vehicles, an in-vehicle adapter, and a mobile phone.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, when the mobile phone is mounted on the in-vehicle adapter, the internal variable read by the control unit of the in-vehicle adapter by the control unit of the mobile phone, that is, the plurality of variables corresponding to the vehicle type stored in the storage unit. The echo canceller is operated with the internal variable selected by the selecting means from the internal variables.
[0008]
In this way, when making a hands-free call with the mobile phone attached to the in-vehicle adapter, the optimal internal variable corresponding to the vehicle type is selected by the selection means, so that the interior environment of the vehicle with the in-vehicle adapter attached can be selected regardless of the vehicle type. It is possible to provide a favorable call environment according to the situation.
[0009]
According to the second and third aspects of the invention, when the mobile phone according to the third aspect is mounted on the in-vehicle adapter according to the second aspect, the internal variable read by the control means of the in-vehicle adapter by the control means of the mobile phone, that is, The echo canceller is operated with the optimum internal variable selected by the selection means from among the plurality of internal variables stored in the storage means and corresponding to the vehicle type.
Thus, the same effect as that of the first aspect of the invention can be obtained.
[0010]
Also, in this case, it is not necessary to have a one-to-one correspondence between the mobile phone and the in-vehicle adapter. For example, a plurality of in-vehicle adapters are attached to different types of vehicles, and internal variables corresponding to the vehicle type are selected by the selection means. By doing so, you can make a hands-free call in a car of a plurality of different cars using a single mobile phone, or you can make a hands-free call with a single in-vehicle adapter for a plurality of mobile phones, etc. Usability can be improved.
[0011]
According to the invention of claim 4, when the mobile phone is mounted on the in-vehicle adapter, the control unit of the mobile phone operates the noise canceller together with the echo canceller with the internal variable read by the control unit of the in-vehicle adapter.
This makes it possible to provide a better calling environment when a hands-free call is made by mounting the mobile phone on the in-vehicle adapter.
[0012]
According to the invention of claim 5, when the mobile phone according to claim 5 is attached to the in-vehicle adapter according to claim 2, the echo canceller and the internal variable read out by the control means of the in-vehicle adapter are combined with the echo canceller by the control means of the mobile phone. The noise canceller is operated.
Thus, the same effect as that attained by the 4th aspect can be attained.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
First, in FIG. 2 showing the overall configuration of the mobile phone 1, a start key 2a, a redial key 2b, an end key 2c, numeric keys 2d of "0" to "9", * (asterisk) are provided on the front side of the mobile phone 1. Various keys 2 including a key 2e, a # (sharp) key 2f, a power key 2g, a clear key 2h and a function key 2i, a display 3 for displaying numbers and characters, a microphone (transmitter) 4 and a speaker (receiver) 5 Etc. are provided. Further, a 16-core connector 6 is provided on the back side of the mobile phone 1, and a telescopic antenna 7 is provided on the top.
[0014]
In FIG. 3 which shows the whole structure of the vehicle-mounted adapter 8, the vehicle-mounted adapter 8 is made into the shape where the said mobile telephone 1 is mounted so that attachment or detachment is possible, and when the mobile telephone 1 is mounted | worn on the upper surface side, a mobile telephone A 16-core connector 9 that is electrically and mechanically connected to one connector 6 and a hands-free speaker 10 are provided. The in-vehicle adapter 8 is connected with a hands-free microphone 12 attached to, for example, a steering wheel console of an automobile via a cord 11 and a dip switch 13 as a selection means to be described later. The operating power of the in-vehicle adapter 8 is supplied through a power cord 8a by inserting a plug (not shown) into a cigarette lighter socket provided in the vehicle.
[0015]
Now, the electrical block configuration of the mobile phone 1 and the in-vehicle adapter 8 will be described with reference to FIG. First, the electrical configuration of the mobile phone 1 will be described.
A control circuit 14 as a control means mainly composed of a microcomputer includes a connector 6, an RF circuit 15, an audio interface unit (hereinafter referred to as AIU) 16, and a digital signal processor (Digital). A signal processor (hereinafter referred to as DSP) 17 is connected.
[0016]
The RF circuit 15 is connected to the antenna 7 and outputs a transmission signal given from the DSP 17 via the control circuit 14 to the base station as a radio signal from the antenna 7, and also receives radio waves from the base station received by the antenna 7. The signal is output to the DSP 17 through the control circuit 14 as a received signal.
[0017]
The AIU 16 is controlled by the control circuit 14, and includes an A / D conversion unit, a D / A conversion unit, an amplification unit, and switching units 16a and 16b. In the AIU 16, the switching units 16a and 16b are turned on (closed) when the mobile phone 1 is not attached to the in-vehicle adapter 8, that is, when used alone. The given received signal is amplified by the amplifying unit, converted from an analog signal to a digital signal by the A / D conversion unit, output to the DSP 17 through the receiving line L1, and sent from the DSP 17 through the transmitting line L2. Is converted from a digital signal to an analog signal by a D / A converter, amplified by an amplifier, and output to the speaker 5.
[0018]
The reception line L1 is branched and connected to the reception line terminal 6a of the connector 6, and the transmission line L2 is branched and connected to the transmission line terminal 6b of the connector 6.
[0019]
Now, the DSP 17 will be described in detail. The DSP 17 is controlled by the control circuit 14 in the same manner as the AIU 16, and includes a hands-free echo canceller 17a, a hands-free noise canceller 17b, a handset noise canceller 17c, a memory unit 17d as a storage unit, and a speech encoding unit 17e. It is configured with.
[0020]
The hands-free echo canceller 17a and the hands-free noise canceller 17b are operated when the mobile phone 1 is attached to the in-vehicle adapter 8, that is, when a hands-free call is made. In contrast, the handset noise canceller 17c is operated when the mobile phone 1 is not attached to the in-vehicle adapter 8, that is, when the mobile phone 1 is used alone.
[0021]
A plurality of internal variables 1 to n are stored in the memory unit 17d, and the handset noise canceller 17c is provided with any given internal variable from among the internal variables 1 to n. It is designed to operate with characteristics based on. The internal variables 1 to n are reduced in manufacturing cost by adopting the same data structure as the internal variables stored on the vehicle-mounted adapter 8 described later, so that the echo canceller coefficient for hands-free, It consists of a hands-free noise canceller coefficient and a handset noise canceller coefficient.
[0022]
That is, since the internal variables 1 to n stored in the memory unit 17d of the DSP 17 are read at the time of the handset call as described above, actually, the internal variables are noise cancellers for the handset. Only the coefficient is used as data, and the echo canceller coefficient for hands-free and the noise canceller coefficient for hands-free are not used as data even if read.
[0023]
The internal variables 1 to n of the memory unit 17 are those in which the optimum internal variable is selected by actually making a call when the mobile phone 1 is used alone. Is done by executing.
[0024]
The voice encoding unit 17e generates the transmission signal by encoding the reception signal given from the microphone 4 via the AIU 16, outputs the transmission signal to the RF circuit 15 via the control circuit 14, and The transmission signal is generated by decoding the reception signal given from the RF circuit 15 via the control circuit 14, and the transmission signal is output to the speaker 5 via the AIU 16.
[0025]
Next, the electrical configuration of the in-vehicle adapter 8 will be described.
The connector 9, the DIP switch 13, the AIU 19, the memory 20 as the storage means, and the RF circuit 21 are connected to the control circuit 18 as the control means composed mainly of the microcomputer.
[0026]
The AIU 19 is controlled by the control circuit 18 and includes an A / D conversion unit, a D / A conversion unit, an amplification unit, and switching units 19a and 19b in the same manner as the AIU 16 described above. Yes. As the mobile phone 1 is mounted on the in-vehicle adapter 8, the switching units 19a and 19b are electrically and mechanically connected to the connector 6 of the mobile phone 1 and the connector 9 of the in-vehicle adapter 8, that is, When the detection terminal 6c of the connector 6 and the detection terminal 9c of the connector 9 are connected, the reception line terminal 6a of the connector 6 and the reception line terminal 9a of the connector 9 are connected, and the transmission line terminal 6b and the transmission line are connected. The terminal 9b is connected to be in an on state (closed state). At that time, the switching units 16a and 16b of the AIU 16 of the mobile phone 1 are in an off state (open state).
[0027]
That is, when the mobile phone 1 is attached to the in-vehicle adapter 8, the AIU 19 amplifies the reception signal given from the microphone 12 by the amplification unit, converts the analog signal to the digital signal by the A / D conversion unit, and receives the reception. In addition to outputting to the DSP 17 through the lines L3 and L1, the transmission signal given from the DSP 17 through the transmission lines L2 and L4 is converted from a digital signal to an analog signal by the D / A conversion unit, amplified by the amplification unit, and the speaker. 10 is output.
[0028]
The dip switch 13 can set a vehicle type such as a luxury car, an intermediate car, a van, or a truck, for example, and the control circuit 18 can identify the setting state of the dip switch 13. In this case, the dip switch 13 is set by an operator so that when an in-vehicle adapter is set in a vehicle, an optimal internal variable corresponding to the vehicle type of the vehicle is selected. If the setting can be easily performed, the user may set it.
[0029]
The memory unit 20 stores the same internal variables 1 to n as those stored in the memory unit 17d of the DSP 17 described above. The internal variables 1 to n correspond to the setting of the dip switch 13 on a one-to-one basis, so that the control circuit 18 sets the dip switch 13 when the mobile phone 1 is attached to the in-vehicle adapter 8. The internal variable selected by can be read out. The internal variable read by the control circuit 18 is output to the DSP 17 via the control circuit 14 on the mobile phone 1 side and expanded in a predetermined RAM area in the DSP 17. The echo canceller 17a and the hands-free noise canceller 17b operate with characteristics based on the developed internal variables.
[0030]
The internal variables 1 to n stored in the memory unit 20 are read out during a hands-free call as the mobile phone 1 is attached to the in-vehicle adapter 8 as described above. Actually, in the case of internal variables, the echo canceller coefficient for hands-free and the noise canceller coefficient for hands-free are used as data, and the noise canceller coefficient for handsets is not used as data even if it is read out.
[0031]
The RF circuit 21 is connected to a vehicle-mounted diversity antenna 22 attached to a vehicle window or the like (see FIGS. 3 and 4). When the cellular phone 1 is attached to the in-vehicle adapter 8, radio signals are transmitted to and received from the base station via the in-vehicle diversity antenna 22. That is, when the mobile phone 1 is attached to the in-vehicle adapter 8, the RF circuit 21 outputs a transmission signal given from the DSP 17 via the control circuits 14 and 18 from the in-vehicle diversity antenna 22 to the base station as a radio wave signal. The radio signal from the base station received by the in-vehicle diversity antenna 22 is output as a received signal to the DSP 17 via the control circuits 18 and 14.
[0032]
Next, the operation of the above configuration will be described with reference to FIGS.
First, when the user uses the mobile phone 1 alone, for example, indoors or on the road, as described above, the switching units 16a and 16b of the AIU 16 of the mobile phone 1 are turned on. The received reception signal is output to the DSP 17 through the reception line L1, is encoded in the DSP 17, is output to the RF circuit 15 as a transmission signal, and is output from the antenna 7 to the base station as a radio wave signal. The radio signal from the base station received by the antenna 7 is output as a received signal from the RF circuit 15 to the DSP 17 and decoded in the DSP 17 to be output as a transmitted signal to the speaker 5 through the transmission line L2. Sound is output from the speaker 5.
[0033]
At this time, in the DSP 17, the handset noise canceller 17c operates with characteristics based on the internal variables given from the memory unit 17d, thereby providing a favorable call environment.
[0034]
Now, a case where the user brings the mobile phone 1 into the car and attaches the mobile phone 1 to the in-vehicle adapter 8 will be described with reference to the flowcharts shown in FIGS. 5 is a flowchart showing the control contents of the control circuit 18 of the in-vehicle adapter 8, and FIG. 6 is a flowchart showing the control contents of the control circuit 14 of the mobile phone 1.
[0035]
When the user attaches the mobile phone 1 to the in-vehicle adapter 8, as shown in FIG. 4, first, in the in-vehicle adapter 8, the control circuit 18 indicates that the mobile phone 1 is attached, that is, the detection terminal of the connector 6. 6c and the detection terminal 9c of the connector 9 are detected ("YES" is determined in step S1), and the switching units 19a and 19b of the AIU 19 are turned on (step S2). As a result, the DSP 17 in the mobile phone 1 and the microphone 12 of the in-vehicle adapter 8 are connected through the receiving lines L1, L3 and the AIU 19, and the DSP 17 and the speaker 10 are connected through the transmitting lines L2, L4 and the AIU 19.
[0036]
That is, the reception signal received by the microphone 12 is output to the DSP 17 through the reception lines L3 and L1, and is encoded in the DSP 17, and is output to the RF circuit 21 through the control circuits 14 and 18 as a transmission signal. The radio wave signal is output from the antenna 22 to the base station. The radio signal from the base station received by the in-vehicle diversity antenna 22 is output as a received signal from the RF circuit 21 through the control circuits 18 and 14 to the DSP 17 and is decoded in the DSP 17 to be transmitted as a transmission signal. The sound is output to the speaker 10 through the lines L2 and L4, and the sound is output from the speaker 10.
[0037]
Next, the control circuit 18 reads the internal variable selected based on the setting state of the DIP switch 13 from the memory unit 20 (step S3), and when the reading of the internal variable is completed (determined as “YES” in step S4). The read internal variable is transmitted to the control circuit 14 of the mobile phone 1 through the connectors 9 and 6 (step S5). At this time, if the reading of the internal variable is not completed within a predetermined time due to some malfunction ("NO" in step S4, "YES" in step S6), the control circuit 18 determines that a predetermined error has occurred. Processing is executed (step S7).
[0038]
On the other hand, in the mobile phone 1, the control circuit 14 detects that the mobile phone 1 is attached to the in-vehicle adapter 8 ("YES" is determined in step T1), and a predetermined RAM area in the DSP 17 is detected. Is cleared (step T2), and the switching units 16a and 16b of the AIU 16 are turned off (step T3). As a result, the DSP 17, the microphone 4, and the speaker 5 in the mobile phone 1 are blocked.
[0039]
Then, the control circuit 14 determines whether or not the internal variable transmitted from the control circuit 18 of the in-vehicle adapter 8 is received in accordance with step S5 described above, and when it is received (determined as “YES” in step T4). The received internal variable is developed in a predetermined RAM area in the DSP 17 (step T5).
[0040]
At this time, in response to this, the hands-free echo canceller 17a and the hands-free noise canceller 17b operate with characteristics based on the developed internal variables, and a hands-free call is made (step T6). At this time, if the internal variable cannot be received within a predetermined time due to some trouble ("NO" at step T4, "YES" at step T7), the control circuit 14 performs predetermined error processing. It is to be executed (step T8).
[0041]
In this way, in this embodiment, the in-vehicle adapter 8 stores different internal variables 1 to n in the memory unit 20 depending on the vehicle type, and the dip switch 13 selects the optimum internal variable from among the internal variables 1 to n. When the mobile phone 1 is mounted by the control circuit 18, the selected internal variable is read out, and when the mobile phone 1 is mounted on the in-vehicle adapter 8, The control circuit 14 is configured to operate the hands-free call echo canceller 17a with characteristics based on the read internal variables.
[0042]
Therefore, when the mobile phone 1 is attached to the in-vehicle adapter 8 and makes a hands-free call, the setting of the dip switch 13 is set to the setting state corresponding to the vehicle type, so that the vehicle mounted with the in-vehicle adapter 8 can be used regardless of the vehicle type. It becomes possible to provide a favorable call environment according to the in-vehicle environment.
[0043]
In addition, since the hands-free noise canceller 17b as well as the hands-free echo canceller 17a are configured to operate with the internal variables, the mobile phone 1 is mounted on the in-vehicle adapter 8 for better hands-free calling. It becomes possible to provide a simple call environment.
[0044]
Further, in this case, there is no need to make the mobile phone 1 and the in-vehicle adapter 8 correspond one-to-one. For example, a plurality of in-vehicle adapters 8 are attached to automobiles of different vehicle types, and the dip switch 13 is used in accordance with the vehicle type. By selecting a variable, a single mobile phone 1 can be used to make a hands-free call in a plurality of automobiles with different vehicle types, or a single in-vehicle adapter 8 can be used for a plurality of mobile phones 1. This makes it possible to improve usability by making hands-free calls.
[0045]
In addition, this invention is not limited to the said Example, It can deform | transform and expand as follows.
The internal variables 1 to n stored in the memory unit 17d of the DSP 17 of the mobile phone 1 are configured from the noise canceller coefficients for the handset, and the internal variables 1 to n stored in the memory unit 20 of the in-vehicle adapter 8 are used for hands-free. The echo canceller coefficient and the hands-free noise canceller coefficient may be used.
[0046]
In place of the switch units 16a, 16b and 19a, 19b of the AIUs 16 and 19, the AIU 16 is provided with the same switches, and the switches are operated in accordance with the control of the control circuit 14, whereby the handset microphone. 4. The switching operation between the speaker 5, the hands-free microphone 12, and the speaker 10 may be performed.
[Brief description of the drawings]
FIG. 1 is an electrical block configuration diagram of a mobile phone and an in-vehicle adapter according to an embodiment of the present invention. FIG. 2 is an external perspective view of the mobile phone. FIG. 3 is an external perspective view of an in-vehicle adapter. FIG. 5 is a flowchart showing the control contents of the control circuit of the in-vehicle adapter. FIG. 6 is a flowchart showing the control contents of the control circuit of the mobile phone.
In the drawings, 1 is a mobile phone, 8 is an in-vehicle adapter, 13 is a dip switch (selection means), 14 is a control circuit (control means), 17a is an echo canceller, 17b is a noise canceller, 18 is a control circuit (control means), 20 Is a memory (storage means).

Claims (5)

Storage means storing a plurality of internal variables corresponding to the vehicle type, selection means for selecting an arbitrary internal variable from the plurality of internal variables, and reading the internal variables selected by the selection means from the storage means. An in-vehicle adapter having a control means for
A mobile phone comprising: an echo canceller whose characteristics change according to the internal variable; and a control means for operating the echo canceller with an internal variable read by the control means of the in-vehicle adapter when attached to the in-vehicle adapter; An in-vehicle telephone device comprising: A storage means for storing a plurality of internal variables corresponding to the vehicle type;
Selecting means for selecting an arbitrary internal variable from the plurality of internal variables;
An in-vehicle adapter comprising: control means for reading the internal variable selected by the selection means from the storage means. An echo canceller whose characteristics change according to the internal variable, and a control means for operating the echo canceller with the internal variable read by the control means of the in-vehicle adapter when mounted on the in-vehicle adapter according to claim 2. A mobile phone characterized by that. The mobile phone comprises a noise canceller whose characteristics change according to the internal variable,
2. The on-vehicle telephone device according to claim 1, wherein the control unit of the mobile phone operates the noise canceller with an internal variable read by the control unit of the on-vehicle adapter when attached to the on-vehicle adapter. A noise canceller whose characteristics change according to the internal variable,
4. The mobile phone according to claim 3, wherein the control means operates the noise canceller with an internal variable read by the control means of the in-vehicle adapter when attached to the in-vehicle adapter.

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