JPS63278427A - Network controller for automobile telephone system - Google Patents

Abstract

PURPOSE:To form a speech path between a radio equipment and a terminal equipment by driving a switching means based on an on-hook (a) signal from an automobile telephone set, an incoming signal from a radio equipment or an off-hook signal from a terminal equipment by means of a control means. CONSTITUTION:A control means 22 drives a switching means based on various control signals such as an incoming signal from a radio equipment 1, an on-hook signal from an automobile telephone set 2 or an on-hook signal from a terminal equipment. Thus, the radio equipment is connected to a calling circuit 15 and a channel is formed between the radio equipment 1 and the terminal equipment. Moreover, the control signal such as the incoming signal given from the radio equipment 1 to the terminal equipment or the control signal such as an off-hook signal or selection signal given from the terminal equipment to the radio equipment 1 is converted respectively into a control signal suited to an opposite party by a signal conversion means and transmitted to the opposite side as an effective control signal.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a car phone that enables connection of a two-wire terminal device, which is a terminal device for a general public telephone line, to a wireless device for a car phone. The present invention relates to a network control device.

[Conventional technology]

As shown in FIG. 2, the car telephone equipment is composed of a wireless device 1 and a car phone 2, and as long as the wireless device 1 is within a predetermined area, it is possible to form a wireless communication path with a telephone office. Through this wireless device 1, it is possible to make a call between the car phone m2 and a telephone connected to a general public line or another car phone.

[Problem that the invention seeks to solve]

By the way, the wireless communication path formed between the wireless device 1 and the telephone office consists of two channels, a transmission channel and a reception channel.
It consists of two channels. Accordingly, the wired communication path between the wireless device 1 and the car telephone 2 is also a four-wire communication path in which a transmission communication path and a reception communication path exist separately. Therefore, facsimile machines and modems for personal computers used on general public telephone lines, which are two-wire lines, are not connected to car telephones.
It is not possible to connect directly to the wireless device 1 instead.

In response, development is progressing on facsimile devices exclusively for car phones that can be directly connected to wireless devices, but they are significantly more expensive than popular facsimile devices for general public telephone lines. This is not practical. Furthermore, regarding other data terminal devices, the current situation is that little progress has been made in the development of devices applicable to car telephones.

Means for Solving Problem C] The network control device for a car telephone according to the present invention has been made in view of the above problems, and is capable of controlling a communication system that performs mutual conversion between a 2-wire call signal and a 4-wire call signal. a circuit, a switching means for selectively connecting a communication path terminal of a wireless device to either a four-wire communication path terminal of the communication circuit or a communication path terminal of a car telephone; A general public telephone line that converts a telephone control signal into a general public telephone line control signal and applies it to a communication path terminal of a terminal device connected to the two-wire communication path side of the communication circuit, which is obtained from the communication path terminal of the terminal device. a signal converting means that converts a line control signal into a control signal for a car phone and supplies it to the control signal terminal for the wireless device; and a control signal from the control signal terminal of the wireless device or the control signal terminal of the car phone or the terminal. and control means for driving and controlling the switching means based on a control signal from a communication path terminal of the device.

[Effect]

The control means drives the switching means based on various control signals such as an incoming call signal from a wireless device, an on-footer signal from a car telephone, or an off-hook signal from a terminal device. Thereby, the wireless device is connected to the communication circuit, and a communication path is formed between the wireless device and the terminal device. In addition, control signals such as an incoming call signal that should be given from the radio device to the terminal device, or control signals such as off-footer signals and selection signals that should be given from the terminal device to the radio device, are converted by the signal conversion means into control signals that are suitable for the other party. and transmitted to the other party as a valid control signal.

〔Example〕

Hereinafter, the present invention will be described in detail along with examples.

FIG. 1 is a block diagram showing one embodiment of the present invention. The terminal group 10 is a set of terminals connected to the wireless device 1 shown in FIG. 2, and the terminal group 11 is a set of terminals connected to the car phone 2 shown in FIG. Both terminal groups 10 and 11 have a transmission communication path Tx, a reception communication path Rx, and a signal line (
A bus) 13 and a power supply line 14 are respectively connected.

The other ends of the transmission channel Tx and the reception channel Rx connected to the terminal group 10 are connected to the movable contacts of the relay ryl, and the other ends of the transmission channel Tx and the reception channel Rx connected to the terminal group 11 are The other end is connected to one fixed contact of relay ryl.

A transmission communication path Tx and a reception communication path Rx connected to the communication circuit 15 are connected to the other fixed contact of the relay ryl.

The car telephone signal line 13 connecting the terminal group 10.11 is also connected to the CPU 22. However, regarding the signal line related to the hook signal and selection signal in the bus 13, relay ry3 is interposed, and when relay ry3 is "off", terminal group IO (wireless device l side) and terminal group 11
(car phone 2 side) is connected, relay ry3
Terminal group 10 (wireless device 1 side) is disconnected from terminal group 11 (car phone 2 side) by the "on" operation of cpU.
It is designed to connect to 22.

The communication circuit 15 is a circuit that connects a 4-wire communication path consisting of a transmission communication path 'rx and a reception communication path Rx and a 2-wire communication path 16, and the 2-wire communication path 16 is connected to a relay ry.
It is connected to a terminal 17 for a terminal device through two contacts.

A terminal device (not shown) for a general public telephone line is connected to the terminal 17. Also, the communication circuit 15 is 2'1a-4
In addition to the basic function of converting lines, it has a function of detecting a hook signal from a terminal device, converting it into a logic signal, and providing it to the CPU 22.

A PB signal receiving section 23 is connected to the transmission communication path Tx connected to the communication circuit 15. The PB signal receiving section 23 is
A selection signal, that is, a PB (button button) signal outputted from the terminal device to the transmission communication path Tx via the communication circuit 15 is received, and this is converted into an ethical signal and provided to the CPU 22 .

The relay "y2" has a movable contact connected to the terminal 17 side, one fixed contact connected to the two-wire communication path 16, and the other fixed contact connected to the calling signal generating means 18.

The calling signal generating means 18 is a transmitter 19 of 1611z.
, an amplifier circuit 20, a relay ry4, and a transformer 21, and provides a calling signal to a terminal device connected to the terminal 17. Transmitter 19 and relay ry
4 is controlled by the CPU 22. In addition, the amplifier circuit 20
, a voltage of 13.8 V from power line 14 is applied to relay r
Given via y4.

The relay drive circuit 24 is a circuit that appropriately drives the relays ryl to ry5 based on a relay drive signal from the CPU 22, and the drive power for each relay is obtained from the power supply line 14. Further, the power supply circuit 25 is a power supply circuit for driving the communication circuit 15, and generates a voltage of -24V.

Further, the power supply circuits 26 and 27 each generate a voltage of ±5 V, and serve as driving power for various control circuits.

Note that the relays ryl, ry2. As for ry5, FIG. 1 shows the "off" state.

Next, the operation of this embodiment will be explained. First, the incoming call processing operation will be explained. An incoming signal from the control signal terminal of the wireless device 1 is input from the terminal group 10 and sent to the car telephone 2 and the CPU 22 via the signal line 13. CPU22
Incoming call determination processing is performed within the terminal, and only when a predetermined condition is satisfied, the calling signal generation circuit 18 is driven to execute calling processing to the terminal device. Here, the predetermined conditions are: (a) There is an incoming call signal (BL out-of-range display signal is not present) (C) The car phone 2 is in an on-footer state (d)
) The terminal device is in an on-hook state.

Note that the out-of-range indication signal is a signal output from the wireless device 1 when the wireless device 1 enters an area where communication with the station is impossible.

The calling process for the terminal device is as follows: after energizing the amplifier circuit 20 by turning on relay ry4, waiting for 3 seconds, driving transmitter 19, sending a signal for 1 second by turning relay ry2 on and off, and pausing for 2 seconds. This is done through repetition.

In detecting off-hook of a terminal device, it is a condition that (a) to (C) of the above-mentioned incoming call determination conditions are also satisfied at the same time. Therefore, for example, if an off-footer is performed on the car phone 2 while transmitting a call signal, the call process is immediately stopped and the mobile phone returns to the standby state.

For now, assuming that the car telephone 2 does not perform off-hook, the terminal device will perform off-hook. If there is an off-hook signal from the terminal device, the off-hook signal is taken into the CPU 22 from the communication circuit 15.

When the CPU 22 detects the off-footer signal while satisfying the above conditions (a) to (C), it turns off relays ry2 and ry4 to stop sending out the call signal, and turns off relays ryl and ry3, respectively.
"on". This "on" action causes relay ryx to
Then, the movable contact is switched from the car phone 2 side to the communication circuit 15 side, and the movable contact in relay ry3 is switched from the car phone 2 side to the CPU 22 side, thereby completing the connection between the wireless device 1 and the terminal device.

During a call, the hook status of the terminal device is constantly monitored, and if there is an on-footer on the terminal device, the on-footer signal is taken from the call circuit 15 to the CPU 22 and sent to the CPU 22.
Then, relays ryl and ry4 are respectively turned off and returned to the standby state. Further, the CPU 22 simultaneously monitors and applies an out-of-range indication signal from the wireless device 1, and also switches to a standby state when the out-of-range indication signal is input.

Next, the transmission processing operation from the terminal device will be explained. C.P.
When the following four conditions are satisfied: ■ There is an off-footer signal from the terminal device. ■ There is no incoming signal from the wireless device. ■ The car phone 2 is on-footer. ■ There is no out-of-range display signal. Then, the relay ry3 is turned on and a transmission request is made to the wireless device 1. As explained in the incoming call operation, the off-hook signal of the terminal device is taken into the CPU 22 from the call circuit 15.

After the off-footer, the PB multiplied signal as a selection signal from the terminal device is converted into a logic signal by the PB signal receiving section 23 and input to the CPU 22 . At this time, when the first selection signal is input to the CPU 22, the relay ryl is once turned "off" to cut off the dial tone. In this state, the PB signal receiving section 2
The selection signal input to the CPU 22 from time to time via C
The selection signal is stored in the memory in the PU 22, and it is determined that the selection signal has ended when no new selection signal is input for a maximum of 6 seconds.

Thereafter, the accumulated selection signal is converted into a selection signal for a car telephone and sent to the wireless device 1 via the relay ry3 in accordance with the periodic clock. After sending the selection signal,
By turning the relay ryl, which had been turned OFF, back on and connecting the communication path, it becomes possible to talk when the other party responds.

In the call termination process at the time of outgoing call, the hook state of the terminal device is constantly monitored, and when an on-footer is detected, the call is terminated and the relays ryl and ry4 are turned off to disconnect the connection. At the same time, out-of-range indication signals are also monitored.
Relays ryl and ry are activated even when an out-of-range indication signal is input.
4 to "off" each to disconnect.

In this embodiment, the PB signal receiving unit 23 is provided to enable connection of a PB type terminal device, but instead of this, or in addition, a DP (dial pulse)
If a signal receiving section is provided, connection of a DP type terminal device is also possible.

Furthermore, in this embodiment, when making a call, all the series of selection signals from the terminal device are temporarily stored in the memory, and then converted into selection signals for the car telephone and sent to the wireless device 1. Alternatively, each time each selection signal is input from the terminal device, it may be sequentially converted into a selection signal for a car telephone and sent to the wireless device.

〔Effect of the invention〕

As explained above, according to the network control device for a car telephone of the present invention, the control means is configured to control signals based on various control signals such as an incoming call signal from a wireless device, an on-footer signal from a car phone, or an off-footer signal from a terminal device. driving the switching means; Thereby, the wireless device is connected to the communication circuit, and a communication path is formed between the wireless device and the terminal device.

In addition, control signals such as incoming call signals given from the wireless device to the terminal device, or control signals such as off-footer signals and selection signals given from the terminal device to the wireless device, are converted by the signal conversion means into control signals suitable for the other party. . Therefore, the terminal device for the -i public telephone line can be easily used as a terminal device for a car telephone, which is extremely convenient. This means that the range of use of car phones will be expanded dramatically, and will greatly contribute to the spread of car phones.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing the general configuration of a car telephone facility. ■...Wireless device, 2...Car phone, IO...
Group of terminals for connecting radio equipment, 11... Group of terminals for connecting car phone, 13... Signal line, 15... Call circuit, 16
...2-wire communication path, 17...terminal device connection terminal,
18...Call signal generation circuit, 22...CPU,
23...PB signal receiving unit, Tx...transmission channel,
Rx...Reception communication path, ryl~ry4...Relay.

Claims (1)

[Claims] A communication circuit that mutually converts a 2-wire communication signal and a 4-wire communication signal, and a communication path terminal of a wireless device connected to either the 4-wire communication path terminal of the communication circuit or the communication path terminal of a car telephone. a switching means for selectively connecting; and a terminal device connected to the two-wire communication path side of the communication circuit by converting a control signal for a car telephone from a control signal terminal of the wireless device into a control signal for a general public telephone line. a signal conversion means for converting a general public telephone line control signal applied to a communication path terminal and obtained from the communication path terminal of the terminal device into a car telephone control signal and applying it to the radio device control signal terminal; A network control device for a car telephone, comprising a control means for driving and controlling the switching means based on a control signal terminal, a control signal from a control signal terminal of the car phone, or a control signal from a communication path terminal of the terminal device.