JPH10209951A - On-vehicle telephone system, on-vehicle adapter and portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a satisfactory speaking environment regardless of car type in the case of hands-free speaking while mounting a portable telephone set on an on-vehicle adapter. SOLUTION: An on-vehicle adapter 8 is constituted so as to store internal parameters from '1' to 'n' different corresponding to car types in a memory part 20, to select any arbitrary internal parameter out of these internal parameters from '1' to 'n' through a dip switch 13 and to read out the selected internal parameter when a portable telephone set 1 is mounted by a control circuit 18. Besides, the portable telephone set 1 is constituted so as to operate an echo canceler 17a for hands-free speaking with characteristics based on the read internal parameter through a control circuit 14 when it is mounted on the on-vehicle adapter 8. By turning the setting of the dip switch 13 to a setting state corresponding to the car type, the satisfactory hands-free speaking environment corresponding to the inside environment of automobile, to which the on-vehicle adapter 8 is attached, is provided regardless of the car type.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vehicle-mounted adapter,
The present invention relates to an in-vehicle telephone device including a mobile phone that operates an echo canceller when attached to the in-vehicle adapter, the in-vehicle adapter, and the mobile phone.

[0002]

In recent years, with the spread of portable telephones, portable telephones have come to be used not only indoors and on roads but also in automobiles. When the mobile phone is used in a car, the microphone and the speaker for the telephone call are changed from the microphone and the speaker of the mobile phone to the microphone of the vehicle adapter by attaching the mobile phone to the in-vehicle adapter mounted in the car. The speaker is switched to a so-called hands-free call.

At this time, since the sound volume output from the speaker of the vehicle-mounted adapter is large, the sound output from the speaker of the vehicle-mounted adapter is input to the microphone of the vehicle-mounted adapter. The telephone has an echo canceller. In other words, during a hands-free call, the operation of the echo canceller provides a good call environment in the vehicle.

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) used when the calculation is performed by the adaptive filter in the echo canceller. In other words, the characteristics of the echo canceller also depend on the internal variables.

However, since these internal variables are fixedly set for the adaptive filter, that is, for the echo canceller,
For example, if you change the in-vehicle adapter to another car of a different model (for example, change from a car to a truck) and try to make a hands-free call by attaching a mobile phone to the in-vehicle adapter, depending on the in-vehicle environment before the change, However, even if a good communication environment can be provided, there is a problem that a good communication environment cannot be provided after replacement.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a good call environment regardless of a vehicle type when a portable telephone is attached to an in-vehicle adapter to perform a hands-free call. It is an object of the present invention to provide an in-vehicle telephone device, an in-vehicle adapter, and a mobile phone which can be used.

[0007]

According to the first aspect of the present invention, when the portable telephone is mounted on the in-vehicle adapter, the internal means read by the control means of the in-vehicle adapter by the control means of the portable telephone, that is, the storage means. The echo canceller is operated with an internal variable selected by the selecting means from among a plurality of internal variables corresponding to the vehicle type and stored in the echo canceller.

Thus, when a portable telephone is mounted on a vehicle-mounted adapter and hands-free talking is performed, the selection means selects an optimum internal variable according to the vehicle type, thereby enabling the vehicle equipped with the vehicle-mounted adapter regardless of the vehicle type. It is possible to provide a favorable communication environment according to the vehicle interior environment.

According to the second and third aspects of the present invention, when the portable telephone according to the third aspect is mounted on the in-vehicle adapter according to the second aspect, the internal means read by the control means of the in-vehicle adapter by the control means of the cellular telephone. The echo canceller is operated with the variable, that is, 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. Thereby, the same effect as that of the first aspect can be obtained.

In this case, it is not necessary to make the above-mentioned portable telephone correspond to the vehicle-mounted adapter in a one-to-one correspondence. For example, a plurality of vehicle-mounted adapters are mounted on vehicles of different vehicle types, and the internal means corresponding to the vehicle type is selected by selection means. By selecting a variable, a single mobile phone can be used for hands-free communication in a plurality of vehicles of different types of vehicles, or a single vehicle-mounted adapter can be used for multiple mobile phones. For example, it is possible to improve usability.

According to the fourth aspect of the present invention, when the mobile phone is mounted on the in-vehicle adapter, the control means of the mobile phone operates the noise canceller together with the echo canceller based on the internal variables read out by the control means of the on-vehicle adapter. This makes it possible to provide a better call environment when the mobile phone is attached to the in-vehicle adapter to make a hands-free call.

According to the fifth aspect of the present invention, when the portable telephone according to the fifth aspect is mounted on the in-vehicle adapter according to the second aspect, the control means of the cellular phone uses the internal variables read by the control means of the on-vehicle adapter. A noise canceller is operated together with the echo canceller. As a result, the same effect as that of the fourth aspect can be obtained.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. First, in FIG. 2 showing the entire configuration of the mobile phone 1, on the front side of the mobile phone 1, a start key 2a, a redial key 2b, an end key 2c, "0"
~ "9" numeric key 2d, * (asterisk) key 2
e, # (sharp) key 2f, power key 2g, clear key 2h, various keys 2 including function key 2i, display 3 for displaying numbers and characters, microphone (transmitter) 4, speaker (receiver) 5, etc. Is provided. A 16-pin connector 6 is provided on the back side of the mobile phone 1, and a telescopic antenna 7 is provided on the upper side.

In FIG. 3, which shows the entire configuration of the vehicle-mounted adapter 8, the vehicle-mounted adapter 8 is shaped such that the mobile phone 1 is removably mounted thereon. A 16-core connector 9 electrically and mechanically connected to the connector 6 of the mobile phone 1 and a hands-free speaker 10 are provided. The in-vehicle adapter 8 is connected to a hands-free microphone 12 attached to, for example, a console of a steering wheel of the automobile via a cord 11, and has a built-in dip switch 13 as a selection means 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.

Now, an electric block configuration of the above-described portable telephone 1 and the vehicle-mounted adapter 8 will be described with reference to FIG. First, the electrical configuration of the mobile phone 1 will be described. The control circuit 14 as control means mainly composed of a microcomputer includes the connector 6, the RF circuit 15, the audio interface
Unit (Audio Interface Unit, hereinafter referred to as AIU) 16 and a digital signal processor (Digi).
tal Signal Processor (hereinafter referred to as DSP) 17 is connected.

The RF circuit 15 is connected to the antenna 7, outputs a transmission signal provided from the DSP 17 via the control circuit 14 to the base station as a radio signal from the antenna 7, and outputs the base station received by the antenna 7 to the base station. From the DSP 1 via the control circuit 14 using the radio signal from the
7 is output.

The AIU 16 is controlled by the control circuit 14 and includes an A / D converter, a D / A converter, an amplifier, and switching units 16a and 16b, and is constituted by one chip. The AIU 16 switches the switching units 16a and 16b into an ON state (closed state) when the mobile phone 1 is not attached to the in-vehicle adapter 8, that is, when the mobile phone 1 is used alone. The given reception signal is amplified by an amplification unit, converted from an analog signal to a digital signal by an A / D conversion unit, and received by a reception line L1.
Through the transmission line L2 from the DSP 17 to the D / A
The conversion unit converts the digital signal into an analog signal, amplifies the amplified signal, and outputs the amplified signal to the speaker 5.

The receiving line L1 is branched and connected to the receiving line terminal 6a of the connector 6.
The transmission line L2 is branched and connected to a transmission line terminal 6b of the connector 6.

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 and a hands-free noise canceller 17a.
b, a noise canceller 17c for a handset, a memory unit 17d as storage means, and an audio encoding unit 17e.

The hands-free echo canceller 17a and the hands-free noise canceller 17b are operated when the portable telephone 1 is mounted on the vehicle-mounted adapter 8, that is, when a hands-free call is made. On the other hand, the handset noise canceller 17c is operated when the mobile phone 1 is not mounted on the in-vehicle adapter 8, that is, when the mobile phone 1 is used alone.

A plurality of internal variables 1 to n are stored in the memory 17d.
The handset noise canceller 17c is configured to operate with a characteristic based on the given internal variable when an arbitrary internal variable is given from the internal variables 1 to n.
Since the internal variables 1 to n have the same data structure as the internal variables stored in the on-vehicle adapter 8 described later to reduce the manufacturing cost, a hands-free echo canceller coefficient, It is composed of a hands-free noise canceller coefficient and a handset noise canceller coefficient.

That is, since the internal variables 1 to n stored in the memory unit 17d of the DSP 17 are read out during a handset call as described above, actually, the internal variables Only the noise canceller coefficient for use is used as data, and the echo canceller coefficient for hands-free and the noise canceler coefficient for hands-free are not used as data even when read.

The internal variables 1 to n of the memory unit 17
When the mobile phone 1 is used alone, an optimum internal variable is selected by actually making a call, and this is performed, for example, by executing an internal variable selection program.

The audio encoding unit 17e sends the AI
The transmission signal is generated by encoding the reception signal given via U16, the transmission signal is output to the RF circuit 15 via the control circuit 14, and the transmission signal is output from the RF circuit 15 via the control circuit 14 The transmission signal is generated by decoding the given reception signal, and the transmission signal is output to the speaker 5 via the AIU 16.

Next, the electrical configuration of the vehicle-mounted adapter 8 will be described. The connector 9, the DIP switch 13, the AIU 19, the memory 20 as a storage unit, and the RF circuit 21 are connected to a control circuit 18 as a control unit mainly composed of a microcomputer.

The AIU 19 is controlled by the control circuit 18, and has an A / D converter, a D / A converter, an amplifier and a switching unit 19 in the same manner as the AIU 16 described above.
a, 19b, etc., and is constituted by one chip. The switching units 19a and 19b are connected to the mobile phone 1 by attaching the mobile phone 1 to the in-vehicle adapter 8.
When the connector 6 of the connector 6 is electrically and mechanically connected to 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 of the connector 6 6a and the receiving line terminal 9a of the connector 9 are connected, and the transmitting line terminal 6b and the transmitting line terminal 9b are connected to each other to be turned on (closed state).
At this time, the switching units 16a and 16b of the AIU 16 of the mobile phone 1 are turned off (opened).

That is, when the mobile phone 1 is attached to the on-vehicle adapter 8, the AIU 19 amplifies the reception signal given from the microphone 12 by the amplifier, and converts the analog signal into a digital signal by the A / D converter. And the receiving line L3,
Output to the DSP 17 through L1 and the DSP 17
The D / A converter converts a digital signal into an analog signal, amplifies the signal in an amplifying section, and outputs the signal to the speaker 10 through the transmitting lines L2 and L4.

The dip switch 13 is, for example, a luxury car,
The type of the vehicle such as an intermediate car, a van, and a truck can be set. In this case, the dip switch 13 is set by an operator so that when the vehicle-mounted adapter is set in the vehicle, an optimum internal variable according to the type of the vehicle is selected. If the setting can be easily performed, the setting may be performed by the user.

The memory unit 20 stores the same internal variable 1 as that stored in the memory unit 17d of the DSP 17 described above.
To n are stored. The internal variables 1 to n correspond to the setting of the dip switch 13 on a one-to-one basis, whereby the control circuit 18 sets the dip switch 13 when the mobile phone 1 is mounted on the in-vehicle adapter 8. , The selected internal variable can be read. The internal variables read by the control circuit 18 are transmitted to the DSP 17 via the control circuit 14 of the mobile phone 1.
Is output to a predetermined RAM area in the DSP 17, and the hands-free echo canceller 17a and the hands-free noise canceller 17b in the DSP 17 operate according to the characteristics based on the expanded internal variables. It has become.

As described above, the internal variables 1 to n stored in the memory unit 20 are read out during a hands-free call when the mobile phone 1 is mounted on the vehicle-mounted adapter 8. Therefore, actually, in the internal variables, the hands-free echo canceller coefficient and the hands-free noise canceller coefficient are used as data, and the noise canceller coefficient for the handset is not used as data even when read. is there.

The RF circuit 21 is connected to a diversity antenna 22 mounted on a vehicle or the like (see FIGS. 3 and 4). When the mobile phone 1 is attached to the on-vehicle adapter 8, radio signals are transmitted / received to / from the base station via the on-vehicle diversity antenna 22. That is, the RF circuit 2
When the mobile phone 1 is attached to the on-vehicle adapter 8, a transmission signal provided from the DSP 17 via the control circuits 14 and 18 is output from the on-vehicle diversity antenna 22 to the base station as a radio signal, and the on-board diversity is transmitted. The radio signal from the base station received by the antenna 22 is used as a reception signal by the DSP via the control circuits 18 and 14.
17 is output.

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, so that the microphone 4 The received reception signal is transmitted to the DSP through the reception line L1.
The signal is output to the RF circuit 15 as a transmission signal by being coded in the DSP 17, and is output from the antenna 7 to the base station as a radio signal. Also,
The radio signal from the base station received by the antenna 7 is output from the RF circuit 15 to the DSP 17 as a reception signal.
17 is output to the speaker 5 through the transmission line L2 as a transmission signal by being decoded in the speaker 17.
Outputs a voice.

At this time, in the DSP 17, the handset noise canceller 17c operates with characteristics based on internal variables given from the memory unit 17d, thereby providing a favorable communication environment.

Now, a case where the user brings the mobile phone 1 into a car and mounts the mobile phone 1 on the on-vehicle adapter 8 will be described with reference to flowcharts shown in FIGS. FIG. 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.

As shown in FIG. 4, when the user attaches the mobile phone 1 to the in-vehicle adapter 8, first, in the in-vehicle adapter 8, the control circuit 18 determines that the mobile phone 1 has been attached, that is, the connector 6 Is detected (step S1: YES), and the switching units 19a, 19b of the AIU 19 are turned on (step S1).
2). 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 and L3 and the AIU 19, and the DSP 17 and the speaker 10 are connected through the transmitting lines L2 and L4 and the AIU19.

That is, the reception signal received by the microphone 12 is output to the DSP 17 through the reception lines L3 and L1, and
After being encoded in the SP 17, it is output as a transmission signal to the RF circuit 21 through the control circuits 14 and 18, and is output from the in-vehicle diversity antenna 22 to the base station as a radio signal. The radio signal from the base station received by the onboard diversity antenna 22 is output from the RF circuit 21 to the DSP 17 through the control circuits 18 and 14 as a reception signal, 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.

Next, the control circuit 18 reads the selected internal variable from the memory unit 20 based on the setting state of the DIP switch 13 (step S3), and when the reading of the internal variable is completed ("YES" in step S4). Judgment),
The read internal variables are transmitted to the control circuit 14 of the mobile phone 1 through the connectors 9 and 6 (step S5).
At this time, when reading of the internal variables is not completed within a predetermined time due to some trouble (step S4).
Is "NO" and step S6 is "YES"), the control circuit 18 executes a predetermined error process (step S6).
7).

On the other hand, in the portable telephone 1,
The control circuit 14 detects that the mobile phone 1 is attached to the in-vehicle adapter 8 (determined “YES” in step T1), clears a predetermined RAM area in the DSP 17 (step T2), and switches the AIU 16 Parts 16a, 1
6b is turned off (step T3). This allows
The DSP 17, the microphone 4, and the speaker 5 are shut off in the mobile phone 1.

The control circuit 14 determines whether or not the internal variable transmitted from the control circuit 18 of the in-vehicle adapter 8 has been received according to the above-described step S5, and when the internal variable has been received ("YES" in step T4). ), And expands the received internal variable in a predetermined RAM area in the DSP 17 (step T5).

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 expanded internal variables, and a hands-free call is made (step T6). . At this time, if an internal variable cannot be received within a predetermined time due to some trouble (“NO” in step T4, “YES” in step T7)
Control circuit 14 executes predetermined error processing (step T8).

As described above, in this embodiment, the in-vehicle adapter 8 stores the internal variables 1 to n which differ depending on the vehicle type in the memory unit 20, and the dip switch 13 selects the optimum one among the internal variables 1 to n. The internal variables can be selected, and the selected internal variables are read out when the mobile phone 1 is mounted by the control circuit 18, and the mobile phone 1 is mounted on the vehicle-mounted adapter 8. Sometimes, the control circuit 14 is configured to operate the hands-free call echo canceller 17a with characteristics based on the read internal variables.

Therefore, when the portable telephone 1 is mounted on the in-vehicle adapter 8 and hands-free communication is performed, the setting of the dip switch 13 is set to a setting state corresponding to the vehicle type, so that the in-vehicle adapter 8 is attached regardless of the vehicle type. It is possible to provide a favorable communication environment according to the environment inside the car.

In addition to the hands-free echo canceller 17a, a hands-free noise canceller 1a is also provided.
7b is also configured to operate with its internal variables,
When hands-free calling is performed by attaching the mobile phone 1 to the in-vehicle adapter 8, a better calling environment can be provided.

Further, in this case, it is not necessary to make the mobile phone 1 correspond to the vehicle-mounted adapter 8 on a one-to-one basis. By selecting a corresponding internal variable, one mobile phone 1 can be used for hands-free communication in a plurality of vehicles of different types of vehicles, or one mobile phone adapter can be provided for a plurality of mobile phones 1 For example, hands-free communication can be performed using the communication device 8, thereby improving usability.

The present invention is not limited to the above embodiment, but can be modified and expanded 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 by noise canceller coefficients for a handset,
May be composed of a hands-free echo canceller coefficient and a hands-free noise canceller coefficient.

Instead of the switches 16a, 16b and 19a, 19b of the AIUs 16 and 19, similar switches are provided in the AIU 16 and the switches are operated under the control of the control circuit 14, whereby the handset is operated. The switching operation between the microphone 4 and the speaker 5 and the hands-free microphone 12 and the speaker 10 may be performed.

[Brief description of the drawings]

FIG. 1 is an electric block diagram of a mobile phone and a vehicle-mounted adapter according to an embodiment of the present invention.

FIG. 2 is an external perspective view of a mobile phone.

FIG. 3 is an external perspective view of a vehicle adapter.

FIG. 4 is a diagram showing a state in which the mobile phone is mounted on a vehicle-mounted adapter.

FIG. 5 is a flowchart showing control contents of a control circuit of the vehicle-mounted adapter.

FIG. 6 is a flowchart showing control contents of a control circuit of the mobile phone.

[Explanation of symbols]

In the drawing, 1 is a mobile phone, 8 is a 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).

Continuation of front page (72) Inventor Hiroshige Asada 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside DENSO Corporation

Claims (5)

[Claims] 1. A storage device in which a plurality of internal variables corresponding to a vehicle type are stored, a selection device for selecting an arbitrary internal variable from the plurality of internal variables, and an internal variable selected by the selection device. An in-vehicle adapter having control means for reading from the storage means, an echo canceller whose characteristics change in accordance with the internal variables, and an internal variable read by the control means of the in-vehicle adapter when mounted on the in-vehicle adapter And a control means for operating the echo canceller. 2. A storage means for storing a plurality of internal variables corresponding to a vehicle type; a selection means for selecting an arbitrary internal variable from the plurality of internal variables; and an internal variable selected by the selection means. A vehicle-mounted adapter comprising: a control unit for reading from the storage unit. 3. An echo canceller whose characteristics change in accordance with said internal variable, and said echo canceller is operated by an internal variable read by control means of said on-vehicle adapter when mounted on said on-vehicle adapter. A mobile phone comprising control means. 4. The mobile phone includes a noise canceller whose characteristics change in accordance with the internal variables, and the control means of the mobile phone reads out the control means of the vehicle-mounted adapter when the mobile phone is mounted on the vehicle-mounted adapter. The on-vehicle telephone device according to claim 1, wherein the noise canceller is operated by an internal variable. 5. A noise canceller whose characteristic changes according to the internal variable, wherein the control means operates the noise canceller with the internal variable read by the control means of the vehicle-mounted adapter when the noise canceller is mounted on the vehicle-mounted adapter. The mobile phone according to claim 3, wherein: