JPS62260432A - Misoperation preventing system in transmission and reception equipment - Google Patents

Abstract

PURPOSE:To improve the operability by preventing the operation of a transmission/reception switch in the standby state of the reception when a keylock switch for misoperation prevention is turned on and attaining the answer by a Push to Talk(PTT) switch through the operation of the switch after the reception of an incoming call. CONSTITUTION:A keylock switch 20 is connected to a circuit for the titled system, and a system controller 4 inhibits the reception of the operation of a PTT switch 16 and also other switches when the switch 20 is closed in the call standby state. When a call coincident with a preset group number exists (when a code detector 6 detects an incoming call), or the signal is judged to be present by an electric field strength input, only the PTT switch 16 is operated, and when the talking is performed while the PTT switch 16 is being depressed after the reception of the call, the signal is given to an opposite party from an antenna 1 via a modulator 9. The talking state is attained until the opposite party operates a line cutoff switch or the caller operates the end of call switch.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a transmitting/receiving device, for example, a personal radio, even if another operation switch is operated during the standby state after setting a group number, the standby state Concerning a system to prevent erroneous operation from being released.

[Conventional technology]

Conventionally, the above-mentioned erroneous operation prevention system has been provided with a switch called a key lock switch that sets various switches in a non-operating state.

This key lock switch is connected to the various switches connected to the system controller that performs various controls, and also connected to the PTT connected to the system controller.
It was connected in series with a switch (Push to talk). Note that here, the system controller refers to, for example, an application that has already been published by the same applicant (
Since it is similar to the system controller described in Japanese Patent Application Laid-Open No. 59-72825, the details will be omitted, but the point is that it operates according to the on/off of various operation switches, performs transmission and reception, and performs various functions as a personal radio. It causes an action to take place.・Therefore, when the key lock switch is operated, the PTT
The switch and other operating switches are disconnected from the system controller to ensure a waiting state.

[Problem that the invention seeks to solve]

By the way, although the erroneous operation prevention device with the above configuration eliminates the possibility of erroneous operation, the PTT switch is also separated from the system controller, so when there is an incoming call, first release the key lock switch and then switch the PTT switch.
Transmission and reception are possible by operating a switch. Therefore, two operations are required when receiving a call, which is troublesome and causes problems such as the operator pressing the PTT switch and performing the transmission operation while thinking that the key lock switch has been released. Note that even if the PTT switch is pressed while the key lock switch is in the ON state, no signal can be transmitted, and the person in question cannot know it until the other party points it out.

[Purpose of the invention]

The present invention is intended to solve the above-mentioned problems, and eliminates the problem of not being unable to respond due to erroneous operation of the operation switch in the standby state, and also prevents calls from being made by mistake, and when a call is received. The object of the present invention is to provide a system for preventing erroneous operation in a transmitting/receiving device that can respond only with a PTT switch.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention provides a key lock switch for preventing erroneous operation in a transmitting/receiving device such as a personal radio. The gist of the system is that the switching device operates only when a call is made, and a response by the PTT switch becomes possible.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit block diagram of an embodiment of the present invention, in which reception input from a transmitting/receiving antenna 1 is introduced into a demodulator 3 via a transmitting/receiving switch 2. In FIG. This demodulated output is applied to the system controller 4 to drive the speaker 5, and
A digital code signal (see FIG. 2) applied to the code detector 6 and sent from the other station (another communication device) is detected.

The system controller 4 variously controls other circuit blocks in accordance with this detection output. A carrier detector 7 is also provided to detect the presence or absence of an IF (intermediate frequency) carrier in the received signal, and the system controller similarly controls other circuit blocks based on this detection signal.

On the other hand, the audio input from the microphone 8 is applied to the modulator 9 via the system controller 4, but in this case, the outputs of the code generator 10 and the a tone signal generator 11 are applied to the modulator 9 as necessary. It will be applied to and changed rotation.

The signal from the audible tone generator 11 is, for example, 1.8KH.
z monotone sine wave and system controller 4
Generated when necessary under the control of

The output of modulator 9 is transmitted from antenna 1 via switch 2. This switching device 2 is also controlled by the controller 4. Further, a channel controller 12 is provided, which sets the channel (frequency) of the communication device based on output control data from the controller 4.

The timer 13 is activated by a trigger signal from the controller 4 to count time, and the controller 4 performs a timed operation based on the timer output. Reference numeral 14 denotes a memory, which has a RAM (Random Access Memory) configuration, and is used to store communication channels and ATIS (Autonomous Access Memory) of communication partner stations.
+atic Transmitter Identity
ction Signal) codes, etc. are stored. Further, 15 is a ROM (read only memory) in which own station ATIS codes and the like are stored.

Reference numeral 16 denotes a PTT switch, and when this switch is pressed, it becomes a transmitting state. 17 is a call sign setting switch;
Group number and call mode selection can be set. Reference numeral 18 denotes a call end switch, which is used to notify the system of the end of communication, and 19, a reception request switch, which is used to designate an interrupt to a busy channel.

The above is a known configuration, for example, the above-mentioned Japanese Patent Application Laid-open No. 59
It is disclosed in Japanese Patent No.-72825.

In the present invention, a key lock switch 20 is connected to the circuit, and when this switch 20 is closed in the incoming call standby state, the system controller 4
When there is an incoming call that matches the preset group number (when the code detector 6 detects the incoming call), it operates so as not to accept the operation of other switches including the switch 16. Or when it is determined that the electric field strength input is a signal,
Only the PTT switch 16 can be operated. Therefore, if a call is received and the PTT switch 16 is pressed while speaking, a signal is sent to the other party from the antenna 1 via the modulator 9.

Note that this communication state remains possible until the other party operates the line disconnection switch or the other party operates the termination switch.

In addition, when making a call yourself in the standby state,
By releasing the key lock switch 20, normal telephone conversation becomes possible.

FIG. 2 is a flowchart showing only the above-mentioned main parts of the present invention.

〔Effect of the invention〕

As described above, by operating the key lock switch in the receiving standby state after setting the group number, the present invention prevents the inability to respond due to erroneous operation of various switches, and prevents calls from being made by mistake. In addition, when a call arrives, you can respond by operating only the PTT switch, which eliminates the need to release the key lock switch, which is required in the past, and has the effect of improving operability. be.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram showing one embodiment of the present invention, and FIG.
The figure is a flowchart of an embodiment of the invention.

Claims (1)

[Claims] In the reception standby state after setting the group number, the key lock switch is turned on to prevent operation of the operation switches including the PTT switch, and when it is determined that there is a signal from an incoming call or field strength input for the group number. A system for preventing erroneous operation in a transmitting/receiving device, characterized in that only the operation of the PTT switch is accepted.