JPH073741Y2 - Car phone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a car telephone set for use by connecting to a car radio.

[Prior Art] Conventionally, there are two types of telephones for car phones, a large capacity type and a conventional type, and the input / output interfaces such as a hook state and a dial signal are different between the two types. Here, the large-capacity method is a method in which the channel width allocated to one car telephone is narrowed so that many car phones can be used, and the conventional method is
This is a system in which a single mobile phone is provided with a channel interval twice as large as the large capacity, and the number of available channels is smaller than that of the large capacity system. Currently, there are two types of mobile phone sets, one for large-capacity systems and the other for conventional systems. When connecting different interfaces with two types of radios that support these two types of mobile phone sets. In this case, an adapter (signal converter) is used to convert the signal form.

It is considered that these two types of wireless devices will coexist in the future during the equal division. Moreover, when applying to subscribe to a car phone, in regions other than urban areas, which of the large-capacity radio device and the conventional radio device will be supplied differs depending on the region. Since it is unclear which radio is actually supplied, it is confirmed whether an adapter is required and the adapter is prepared.

FIG. 3 is a block diagram showing an example of such an adapter, in which a conventional radio device 1 and a large capacity telephone set 2 are connected by an adapter 3. The power-on / off request signal A, several types of ground E, and the power source V pass through the adapter 3 almost as they are, except that the power source V is connected to the adapter driving power source circuit 4. Two voice signals, a transmission signal S and a reception signal J, are connected to a large capacity telephone set via a buffer 5. In addition, the status signal B such as incoming call or out-of-range is once taken in by the microcomputer 6, converted into a serial signal form compatible with the large capacity system, and then outputted to the telephone. The state of a hook or dial input from the telephone in the form of a serial signal is also taken into the microcomputer 6, converted into a hook signal or a selection signal, and sent to the wireless device 1. Further, the large capacity radio device is supposed to have a memory for speed dial, whereas the conventional system does not have a memory. A speed dial memory memory 7 is provided.

[Problems to be Solved by the Invention] Conventional Problems As described above, two types of conventional car telephones are made to correspond to the radio system, and different types of radios are used. There is a problem that a separate adapter is required to connect the mobile phone and the telephone, and therefore the above problem must be solved.

The purpose of the invention This invention was made to solve the above-mentioned problems, and can be connected to a radio device of both a large capacity system and a conventional system without an adapter, without any special operation. It is an object of the present invention to obtain a car telephone set capable of automatically distinguishing between the large capacity system and the conventional system and switching the input / output interface.

[Means for Solving the Problems] A car telephone set according to the present invention includes a voice input / output unit including a microphone and a receiver, a voice amplification unit connected to the voice input / output unit and amplifying the input / output signal. The audio amplifier includes control means for controlling the audio amplifier, and an automobile telephone terminal connector for connecting input / output signals of the audio amplifier and the controller to a telephone for an automobile telephone. The control means has a function of discriminating whether the radio device for a car telephone connected to the car telephone terminal connector is a large capacity system or a conventional system. The present invention is characterized by automatically identifying the system of the automobile telephone set currently connected to the automobile telephone terminal connector and setting the input / output interface so as to correspond to the identified system.

[Operation] Since the car telephone set according to the present invention has the above-mentioned means, it can be connected to a radio device of either a large capacity type or a conventional type without an adapter. Also, when the input / output interface program is initially activated as a large capacity method in the microcomputer in the telephone and a signal different from the large capacity method is input when a conventional radio is connected, this is detected. Then, change to the conventional I / O interface program.

In this way, it is possible to automatically distinguish between the large capacity method and the conventional method and switch the input / output interface without any special operation.

[Embodiment] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall configuration diagram of a car telephone set according to the present invention, in which a microphone 10 and a receiver 12 are connected to a terminal of a car phone terminal connector 18 via a transmitting voice amplifying section 14 and a receiving voice amplifying section 16, respectively. It is connected to NO.1 and 2. The microcomputer 20 controls the transmitting voice amplifying section 14, the receiving voice amplifying section 16, the key input section 26, the display section 28, etc., and also functions as an input / output interface together with the automobile telephone terminal connector 18. Port NO.1, output port N
O.2, input port NO.3, output port NO.4, input port NO.
5 and each port is connected to terminals No. 3, 4, 8, 9, 10 of the car telephone terminal connector 18. Car phone terminal connector 18 terminal NO.5 is a switch
It is grounded via 22, and the terminal NO. 6 is connected to the power supply circuit 24.

As is apparent from FIG. 1, the car telephone terminal connector 18
The terminals Nos. 1, 2, 5, 6, and 7 are commonly used for connection between the large capacity radio and the conventional radio. Terminals Nos. 3 and 4 to which a down serial signal and an up serial signal are connected when a large capacity wireless device is connected are respectively connected to a clock signal and a selection signal when a conventional wireless device is connected.

The terminals NO. 8, 9 and 10 to which the out-of-range display signal, the hook signal and the option 5 signal are connected when the conventional method is connected are empty when the large capacity method is connected.

Next, a flow chart shown in FIG. 2 for a method of determining which of the two methods the radio is connected to when connecting the car telephone to the car telephone as shown in FIG. It will be explained based on. In order to discriminate which one of the two methods is being connected to the radio, attention is paid to the signal input from the terminal No. 3 of the automobile telephone terminal connector 18. The signal content of the terminal NO.3 varies depending on which type of signal is connected, as shown in FIG. 2B. In the case of the large capacity method, it is a signal of 11-bit serial signal format, and in the case of the conventional method, it is a 600 Hz clock signal that is continuously output immediately after power is turned on.
The discrimination can be easily done by software.

FIG. 2A shows an example of a flowchart for performing automatic identification of the method in this way. After the start, in step 100, the judgment counter is set to 0, and in step 1
At 02, it is determined whether the identification period has ended. If the identification period has ended, the large capacity method is set in step 104, and the automatic identification operation ends. On the other hand, when the identification period has not ended, the interrupt interval T is measured in step 106,
Next, it is judged whether or not this interrupt interval T is within 1/600 (seconds) ± ΔT, and if it is within this interval, step 110
In step 112, the value of the judgment counter is incremented by 1, and in step 112 it is judged whether or not the value of the judgment counter is equal to or more than a predetermined value N. If the value is equal to or more than the predetermined value, the process proceeds to step 114, the conventional method is set, and the automatic determination operation is ended.

If the determination in step 108 is negative, step 1
The determination counter is cleared at 16 and the process returns to immediately before step 102. When the result in step 112 is negative, the process similarly returns to step 102.

The identification program based on the flowchart described above is
Immediately after the power is turned on, it is operated only during the preset identification period. About one second is sufficient for this operation period because the clock signal at the time of connection in the conventional method is continuously output immediately after the power is turned on. Connect the signal of terminal NO.3 to the serial input port internal NO.1 and connect it in parallel to the interrupt terminal to which the interrupt permission is given only during the interrupt period. If this interrupt is set to occur at every falling edge or rising edge of terminal NO.3, the interval (T) at which this interrupt is applied becomes 1/300 seconds or more when a serial signal is input. for,
When the clock is input, the interval is 1/600 second.
This difference is clear, and since it can be completed in a short identification period after the power is turned on, usually about 1 second, it is very effective in practice.

Further, ΔT and the integer N of 1 or more in the flowchart are values that define the margin for noise, and are set to values that can eliminate identification errors.

As described above, it is possible to realize a car telephone set that can handle both the large-capacity system and the conventional system without using an adapter. Compared with the conventional one that can support only one of these methods, in the present embodiment, several I / O ports are added in hardware, and an identification part and another interface part are added in software. It has a merit that it can be configured by simply doing so, and most of the voice part, the display part, and the control of the key input part can be shared.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made to the arrangement of terminals of the automobile telephone terminal contactor 18 and the configuration of the identification program of the large capacity type and the conventional type.

[Advantages of the Invention] As described above, the invention is an automobile telephone terminal connector formed so as to be connectable to both a large capacity radio device and a conventional radio device, and an automobile connected to the automobile phone terminal connector. With the configuration provided with the control means having a function of discriminating whether the telephone wire machine is the large capacity type or the conventional type, the connection between the wireless device and the telephone is unified, and the large capacity type and the conventional type are connected. It is possible to connect to any type of wireless device without an adapter. And
It does not require any special setting operation from the outside, such as an external switch, and automatically identifies which of the large-capacity method and conventional method the wireless device is connected to and sets the input / output interface. However, there is an effect that it is possible to support any of the above-described wireless systems.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of one embodiment of the present invention, FIG. 2A is a flow chart diagram for explaining the system identification function of the microcomputer of FIG. 1, and FIG. 2B is a car telephone terminal connector terminal NO. FIG. 3 is a block diagram of an adapter for connecting a conventional radio equipment of the related art and a large capacity telephone set in FIG. 10 …… Microphone 12 …… Receiver 14 …… Sending voice amplification section 16 …… Reception voice amplification section 18 …… Car phone terminal connector 20 …… Microcomputer

Claims (1)

[Scope of utility model registration request] 1. A voice input / output unit including a microphone and a receiver, a voice amplification unit connected to the voice input / output unit for amplifying the input / output signal, a control unit for controlling the voice amplification unit, and the voice amplification unit. And a car telephone terminal connector for connecting input / output signals of the control means to the car telephone radio device, and the control means has a large capacity for the car telephone radio device connected to the car telephone terminal connector. It has a function to identify whether it is a system or a conventional system,
A car telephone set characterized in that an input / output interface is set so as to correspond to the identified system.