JPS6161533A - Data communication equipment - Google Patents

Abstract

PURPOSE:To attain data transmission even if no driver exists in an automobile by detecting a call signal to bring an automobile telephone set into off-hook state. CONSTITUTION:A radio transmission/reception section 1 outputs a call tone to a reception signal line (b). A call tone detection circuit 5 detects the call tone and outputs an H level to an OR circuit 6. Then the OR circuit 6 outputs H level to a hook signal line (d) to set the device to the off-hook state. Then the transmission/reception section 1 receives an off-hook signal and transmits/ receives data with a base station, then transmits an operating signal (e) representing the under-operation to a control section 2 and stops the call tone transmitted to the signal line (b). Thus, even when no driver exists in the automobile, the data is transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a data communication device using a car telephone device.

(Prior art and its problems) When using a car phone effectively, it is desirable to be able to automatically receive calls and exchange necessary information even when no operator is present.

However, conventional car telephone devices can only receive calls from the other party when the operator is present in the mobile body, and the telephone line is not connected when the operator is not present.

(Objective) In order to eliminate this drawback, the present invention detects a ringing signal of a car telephone device and automatically answers the call signal.

(Example) An embodiment of the present invention will be described below with reference to FIG.

The wireless transmitting/receiving section 1 and the control section 2 of the car telephone device include a transmitting signal line (a), a receiving signal line (b), and a funk signal line (td) indicating on-hook or off-hook of the handset.
and are connected by a data line for sending and receiving control data. The transmission signal line ta) and the reception signal line tb) are connected to a modem 3, and the modem 3 is connected to a data terminal device 4 via a data line. Reception signal line (b)
is further connected to a ring detection circuit 5, and the output of the ring detection circuit 5 is connected to one input terminal of an OR circuit 6.
The in-use signal output line te) of the control section 2 is connected to the other input terminal of the OR circuit 6, and the output of the OR circuit 6 is connected to the hook signal line (d).

This operation will be explained below.

When the wireless transmitter/receiver 1 receives a call from a partner station via the base station, the wireless transmitter/receiver 1 outputs a ringing tone to the reception signal line tb (FIG. 2(b)). The ring detection circuit 5 detects this ring tone and outputs "H" level to the OR circuit 6 (second
Figure (C)). Next, the OR circuit 6 is connected to the hook signal line td)
outputs "H" to set the device to off-hook state (equivalent to the state where the handset is lifted) (Figure 2 (d)
). Next, the wireless transmitting/receiving unit 1 receives the off-hook signal and after exchanging data with the base station, maintains the designated call line.

A busy signal (e) indicating that the controller 2 is in use is transmitted to the control unit 2, and the ringing tone that was being transmitted to the receiving signal line (b) is stopped (FIG. 2(b)). The control section 2 receives the in-use data from the wireless transmitting/receiving section 1 and outputs the "H" level to the OR circuit 6 (FIG. 2(e)).

On the other hand, when the ringing tone detection circuit 5 no longer detects a ringing tone, the output becomes "L" and is outputted to the OR circuit 6.

Since the in-use signal "H°" level is input to the other input terminal, the off-hook state continues (Fig. 2 (d))
). After the above series of operations, a data line is established, and data is transmitted between the data terminal device of the partner station and the data terminal device 4 of the mobile body via the modulation/demodulation device 3. Next, when the data transmission is finished.

The base station disconnects the call line when the other station goes on-hook or performs an equivalent operation. The control unit 2 is the wireless transmitting/receiving unit 1
Upon receiving the data from the in-use signal ° "L" level (off state) (see Figure 2)), the output of the OR circuit 6 becomes "L" level and becomes an on-hook state (see Figure 2).
Figure (d)) All calls are terminated.

(Effects) The data communication device according to the present invention is capable of automatically detecting a call from the other party, responding to the other party, and transmitting data even when there is no operator in the car. Enables efficient operation.

[Brief explanation of drawings]

FIG. 1 is a system diagram of the apparatus of this invention, and FIG. 2 is a timing diagram showing the timing of each part in FIG. 1: Radio transmitting/receiving section, 2: Control section, 3: Modulation/demodulation device, 4: Data terminal device, 5: Ringing tone detection circuit, 6: OR circuit. Agent Patent Attorney Akio Takahashi Figure 1 Figure 2

Claims (1)

[Claims] A car telephone device comprising a wireless transmitting/receiving section and a control section for controlling the wireless transmitting/receiving section; and a car telephone device that reproduces received data from an audio frequency output signal of the car phone device, converts transmitted data into an audio frequency signal, and transmits data to the vehicle. A modulation/demodulation device for outputting to a telephone device, a data terminal device for exchanging received data and transmission data between the modulation and demodulation device, and a calling signal detection circuit for detecting a calling signal from an audio frequency output signal of the car telephone device. , an OR circuit that outputs an off-hook signal to the car phone device when either an in-use signal indicating that the car phone device is in use or a detection signal of the ringing signal detection circuit is detected. A data communication device characterized by: