JP2000078271A - Hands-free telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide with a simple configuration a 'hands-free telephone set' that conducts switch control with high discrimination accuracy. SOLUTION: A controller 11 has two input terminals 112, 113 and a discrimination circuit 114, that conducts prescribed discrimination based on the combination of a high level signal or a low level signal given respectively to the input terminals. An operation device 12 has plural operation switches 122, 123, 124 and an output circuit 126 that outputs a high level signal and a low level signal according to a prescribed combination to the two input terminals 112, 113 of the controller.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hands-free telephone device used for a vehicle or the like, and more particularly to a hands-free telephone device having a simplified circuit structure for discriminating a control signal from an operation switch.

[0002]

2. Description of the Related Art In recent years, automobile telephones have become extremely popular, and in addition to conventional handset telephones, hands-free telephones have been developed in order to avoid one-handed driving during the operation of the handset.

[0003] In this case, since a car-dedicated telephone cannot be used once the user leaves the car, a conventional general-purpose portable telephone is configured to be connectable to a hands-free set telephone device, and can be used as a car telephone while traveling. so,
There has also been proposed one that can be used as a mobile phone when leaving a car.

[0004] The hands-free telephone device comprises a switch box for an occupant to perform operations such as on-hook and the like, and a main body box to which a telephone is connected and which performs various controls.

[0005]

However, when making a call using a hands-free telephone device, it is necessary to perform some switch control from the switch box to the main box. For example, there are an on-hook switch when receiving a telephone call from outside, an off-hook switch when ending the call, and a memory selection switch for selecting the other party's telephone number from memory when making a call from the user.

Conventionally, as this type of switch control, a so-called voltage dividing system (for example, Japanese Patent Application Laid-Open No. In other words, a so-called communication code system in which a communication IC is provided in a switch box and a communication code corresponding to the type of switch input is transmitted to a main body box has been developed.

However, in such a voltage dividing system, whether the switch input is correctly determined or the erroneous input of a plurality of switches is inadvertently performed depending on the setting of the voltage threshold as a determination reference. There are problems such as signal transmission, and to solve these problems in the irregular mode, the discrimination control circuit becomes extremely complicated. Further, the communication code method has a problem that the cost is high because a communication IC is required.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and has as its object to provide a hands-free telephone device capable of performing switch control with a simple configuration and high discrimination accuracy. I do.

[0009]

In order to achieve the above object, a hands-free telephone device (1) of the present invention comprises a controller (11) to which a telephone (2) is connected and a control signal to the controller. A hands-free telephone device having an operating device (12) for transmitting, and inputting the voice of the occupant from an external microphone (121) and outputting the voice of the other party from an external speaker (111). Is a discriminating circuit that performs a predetermined discrimination based on a combination of at least two input terminals (112, 113) and a first level signal (Hi) or a second level signal (Lo) input to each of these input terminals. 114), and the operation device (12) includes a plurality of operation switches (122, 123,
124) and an output circuit (125) that outputs a first level signal (Hi) and a second level signal (Lo) in a predetermined combination to two input terminals of the controller when the respective operation switches are input. ).

In the hands-free telephone device of the present invention, when any one of the plurality of operation switches is operated, a combination signal of the first level signal and the second level signal corresponding to the operation switch is applied to two input terminals of the controller. Sent to. The discriminating circuit of the controller discriminates the combination signal of the first level signal and the second level signal thus inputted by a predetermined discriminating logic. Thereby, the control corresponding to the operation switch is executed.

As described above, in the hands-free telephone device of the present invention, since the control signal is determined based on the combination signal of the two types of level signals to the two input terminals, the setting of the voltage threshold in the voltage division method is performed. It is possible to avoid erroneous determination due to annoyance or erroneous operation. Further, an expensive communication IC such as a communication code system is not required.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view showing a hands-free telephone device according to an embodiment of the present invention, FIG. 2 is a circuit block diagram of the embodiment, and FIG. 3 is a matrix diagram showing an example of switch control in the embodiment.

The hands-free telephone device 1 of the present embodiment is
The mobile phone 2 can be connected to be used as an automobile phone or as a general-purpose mobile phone 2 itself, and includes a controller 11 and an operating device 12.

The operation unit 12 has an external speaker 121 for taking in the voice of the occupant to be transmitted to the other party. Further, an on-hook switch 122 for receiving a call and an up switch 123 and a down switch 124 for selecting the other party's telephone number when making a call and selecting various operations are button-type switches. Provided. This operating device 12
For example, a right-hand drive vehicle is mounted on a right front pillar in a room so that a driver can operate the vehicle as it is.

As shown in FIG. 2, the controller 12 and a controller 11, which will be described later, are connected by a harness 125 having a 4-pin pin jack. Two of the four poles are a power supply line 125a and a ground line. 125d, and the remaining two poles are signal lines 125b and 125c.

One of the signal lines 125b is connected to an external microphone 121, and transmits an audio signal input to the external microphone 121. On the other hand, the other signal line 125c transmits switch signals from three operation switches 122, 123, and 124 provided on the operation device 12. This will be described later.

On the other hand, the controller 11 has a built-in external speaker 111 for outputting the voice of the other party into the room, and the controller 11 is placed at an appropriate place in the vehicle compartment. The controller 11 is supplied with 12 V power from a vehicle-mounted battery by a power harness 115, and is connected to the mobile phone 2 by a telephone harness 116 having a 16-core connector.

The voice signal of the other party received by the portable telephone 2 reaches the reception voice terminal 116a through the telephone harness 116, is subjected to voice processing by the voice processing circuit 117, and then is processed by the attenuator 118 and the power amplifier 11
9 and output from the external speaker 111. on the other hand,
The driver's voice signal input from the external microphone 121 of the operation device 12 reaches a voice processing circuit 117 via a signal line 125b, where the voice signal is processed, and then transmitted from a transmission voice terminal 116b to a telephone harness 116. Sent to the mobile phone 2.

Note that among the signal line terminals of the telephone harness 116, 116c is a reception serial signal terminal, and 116c is a reception serial signal terminal.
A transmission serial signal terminal d communicates control signals between the mobile phone 2 and the communication processing circuit of the microcomputer 114.

The microcomputer 114 of the controller 11
Are the operation switches 122, 123, and 124 of the operation device 12.
In addition to various controls in accordance with operation signals from the user, the driver's voice signal input to the external microphone 121 is transmitted to the mobile phone 2.
And the control to output the voice signal of the other party transmitted from the mobile phone 2 to the external speaker 111.

In the controller 12 of the present embodiment, two signal lines 125b and 125c of the harness 125 having a four-pole pin jack are connected to the microcomputer 1
14 first input port 112 and second input port 11
3 and the three operation switches 122, 123, and 124 are determined using these two signal lines.

That is, an example of the output circuit 126 of the present invention is shown in the circuit block diagram of FIG. 2. According to this, when the signal power is applied to the power line 125a, the on-hook switch 122 is input. Yes (close)
And the first input port 112 is at the same level of H as the signal power.
i, the second input port 113 is at the ground level Lo of the on-hook switch 112.

When the up switch 123 is input (closed), the second input port 113 maintains the same level Hi as the signal power supply, but the first input port 112 is at the ground level Lo of the up switch 123.

Further, when the down switch 124 is input (closed), both the first input port 112 and the second input port 113 become the ground level Lo of the down switch 124.

That is, as shown in FIG. 3, when each of the three operation switches 122, 123, and 124 is input, the combination of the level of the input signal to the first input port 112 and the second input port 113 is changed. Since these are different from each other, the microcomputer 114 can easily determine this, and based on this, the operation switches 122, 123, and 12 stored in the microcomputer are used.
The control logic corresponding to No. 4 is executed.

As described above, in the hands-free telephone device 1 of the present embodiment, the three operation signals from the operation device 12 are
Since the determination is made based on the combination of the i / Lo level, the communication I
C is not required, and the discrimination is much easier.

The embodiments described above have been described in order to facilitate understanding of the present invention, but are not described to limit the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

In the embodiment described above, three operation switches 122, 123, and 124 and two input ports 112,
Although the present invention has been described at 113, when there are two input ports, four operation switches can be provided. If the number of input ports is three or more, five or more operation switches can be provided.

[0029]

As described above, according to the present invention, the control signal is determined by the combination signal of the two types of level signals to the two input terminals. It is possible to avoid erroneous determination due to annoyance or erroneous operation. Further, an expensive communication IC such as a communication code system is not required.

[Brief description of the drawings]

FIG. 1 is an external view showing an embodiment of a hands-free telephone device of the present invention.

FIG. 2 is a circuit block diagram showing an embodiment of the hands-free telephone device of the present invention.

FIG. 3 is a matrix diagram showing an example of switch control in the hands-free telephone device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Hands-free telephone device 11 ... Controller 111 ... External speaker 112 ... 1st input port (input terminal) 113 ... 2nd input port (input terminal) 114 ... Microcomputer (discrimination circuit) 12 ... Operating device 121 ... External microphone Reference numeral 122: On-hook switch (operation switch) 123: Up switch (operation switch) 124: Down switch (operation switch) 126: Output circuit 2: Mobile phone (telephone)

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Kobayashi F-term (reference) in Calsonic Co., Ltd. 5-24-15 Minamidai, Nakano-ku, Tokyo 3D020 BA07 BA10 BA11 BD14 BE03 5K011 AA04 AA09 AA10 FA05 FA06 GA03 GA07 JA01 KA13 5K023 AA09 BB20 EE12 EE13 GG04 GG12 5K027 AA16 BB05 EE01 EE11 HH03 KK01 5K067 AA33 BB03 FF38 GG01 GG11 GG21

Claims (1)

[Claims] 1. A hands-free telephone having a controller including a telephone and an operation unit for transmitting a control signal to the controller, wherein a hands-on voice is input from an external microphone and a voice of a call partner is output from an external speaker. In the apparatus, the controller includes at least two input terminals, and a determination circuit that performs a predetermined determination based on a combination of a first level signal or a second level signal input to each of the input terminals, The operation device includes a plurality of operation switches and an output circuit that outputs a first level signal and a second level signal in a predetermined combination to two input terminals of the controller when each operation switch is input. A hands-free telephone device comprising: