JPH0481909B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] In a car phone, the dial lock state that prohibits reception by unauthorized use is canceled by the same procedure as for making a call.By adding a function to automatically terminate a call, the busy tone is eliminated. prevent the occurrence of

[Industrial application field]

The present invention relates to a method for unlocking a car telephone.

[Conventional technology]

A car telephone installed in a car may be used without permission when the car is lent to someone else. In such cases, it is convenient to have a function that allows you to press the lock key to enter a state in which you can receive calls but cannot make outgoing calls (dial lock state).

Car phones are broadly divided into the phone itself and the radio device.
Once the radio remembers that it is in dial lock, it will not send the dialed number input during that time to the station. At the same time, the binary level out-of-service signal, which normally indicates whether or not the car's location is within the car phone's service area, is inverted at regular intervals, and the out-of-service indicator on the phone itself flashes to indicate that the dial is locked. Let me know.

This dial lock is released by inputting a predetermined password using the dial number input key and then pressing the start key.

[Problem that the invention seeks to solve]

However, since the start key has the same function as off-hook by handle set, the radio transmits a busy tone to the telephone body after unlocking. In order to stop this Vichy tone, you have to press the end key to end the call to the same state as on-hook, and during this time not only is it unpleasant to hear unnecessary Vichy tones, but also the extra operation of pressing the End key is required. There is a drawback.

The present invention attempts to solve the above-mentioned problems by automating the call termination process when the dial lock is released.

[Means for solving problems]

The present invention provides a dial lock release method for a car phone in which a dial signal and a hook signal are sent from the telephone body to a radio, and an out-of-range signal is sent from the radio to the telephone body. Detects the presence or absence of dial lock from
Furthermore, when the key input of a predetermined number of digits of the password and the unlock operation by inputting the start key are detected during the dial lock, the call is automatically terminated.

[Effect]

Normally, the end of a call process (turning off the hook signal to the radio) is performed on the telephone itself when it detects the on-hook by handle set or the end key is turned on, but in the present invention, the dial lock release operation is also performed on this occasion. Add time. In this way, when the wireless device performs the lock release process, the phone itself ends the call, which prevents the occurrence of a busy tone and eliminates the need to press the end key.

It would be a problem if such automatic call termination processing was performed during a normal call operation. Therefore, in the present invention, an out-of-service signal from the wireless device side is monitored, and only when the signal indicates that the dial is locked, a lock release operation is detected and the corresponding automatic call termination process is performed.

〔Example〕

FIG. 1 is a schematic diagram of the main body of a car phone, and a key switch 20 has various keys 21 to 25 shown in FIG. 2 arranged in a matrix. 31 is a microprocessor (MPU) that plays the central role in control, and its operating program is stored in a read-only memory (PROM).
It is stored in 32. Reference numeral 33 is a rewritable memory (RAM) that stores numbers for redialing, speed dialing, and the like.

The MPU 31 outputs display data (for example, dial number and time) to the number display 11 via the input/output interface 34, and also outputs display data (for example, dial number and time) to the key switch 20.
Capture key input from. In addition, it also sends and receives dial signals, clock signals, hook signals, and out-of-range signals to and from the wireless transceiver. When the out-of-service signal is at a constant H level (for example, out of service area), display 1
2 is lit continuously, and when the L level is constant (for example, within the range), the display 12 is continuously turned off.

35 is a microphone for sending calls, 36 is a sending amplifier for amplifying its output, 37 is a speaker for receiving calls, 38
is a receiver amplifier that amplifies the receiver signal.

FIG. 2 is a diagram showing an example of the operation panel of the main body of the telephone, where 11 is a 10-digit number display, 12 is an out-of-service area display, 21 is a start key, 22 is an end key, and 23 is a memory key for speed dialing ( *), 24 is a redial key (#), and 25 is a numeric keypad from 0 to 9. There is also a lock key, but this is not shown.

The original method for out-of-range signals is for the radio to detect the received field strength and set it to either H or L level, but during dial lock, it is used at a fixed period (( 1 second) and input it to the telephone main body. For this reason,
The MPU 31 causes the display 12 to blink at that period.
Also, the dial lock release sequence shown in FIG. 4 is executed.

In FIG. 4, it is detected whether or not the dial is locked based on whether or not the step out-of-range signal is 1 Hz. If the dial is locked, a flag is set (step, ); otherwise, the flag is cleared (step, ). If the dial lock flag is set (step),
Wait for the 4-digit key-in (PIN number) and start key to turn on (step).

When the MPU 31 receives a 4-digit key-in, it sends it all to the radio through the dial signal line. Also, when the start key is pressed, the hook signal is turned on. Therefore, since the radio device side can determine that it is an unlock operation, it performs operations such as returning the out-of-range signal and returning to a state in which dial reception is possible. This includes returning the busy tone, but since the telephone itself automatically terminates the call by taking a step immediately after the step, no busy tone is generated from the speaker 37 in FIG. 1, for example.
Further, there is no need to press the end key 22 manually.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to automatically prevent the generation of a busy tone in the telephone main body without changing the specifications of the radio device that sends the busy tone to the telephone main body when the dial lock is released.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of the car phone main body, Fig. 2 is a configuration diagram showing an example of the operation panel, Fig. 3 is an explanatory diagram of an out-of-service signal during dial lock, and Fig. 4 shows an embodiment of the present invention. It is a flowchart.

Claims (1)

[Claims] 1. In a dial lock release method for a car phone, a dial signal and a hook signal are sent from the telephone body to a radio, and an out-of-service signal is sent from the radio to the telephone body. Detecting the presence or absence of a dial lock, and further detecting a key entry of a predetermined number of digits of a password and a start key entry to release the lock while the dial is locked, the call is automatically terminated. How to unlock.