JPS62136955A - Public telephone set - Google Patents

Abstract

PURPOSE:To allow the user to recognize how many minutes of call still remains in a card immediately by providing a unit time arithmetic operation section and a remaining time arithmetic operation section. CONSTITUTION:Every time a charging signal is received, a remaining talking time calculation section 11 subtracts a unit monetary amount from the residual amount of a card to obtain a new residue and measures a period of the charging signal after the start of talking. The product between the result of measurement and the new residue is obtained, the time of minute unit or below in the product is rounded off to obtain the remaining talking allowable time, which is fed to a remaining talking time display section 12 and displayed on a display section 7. Thus, the user during talking recognizes how many minutes the user can talk further instantly through the display.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to public telephones such as cashless public telephones.

(Prior Art) Card-operated public telephones currently in general use are capable of making calls while off-hook and while there are coins left in the card or remaining balance on the card, and end the call when on-hook. It is composed of

(Problem to be solved by the invention) By the way, such conventional card-operated public telephones only have the function of displaying the remaining amount of the card on the display, so the user does not have to worry about anything else. The drawback was that it was not immediately obvious whether or not the person could speak in parts.

In view of the above circumstances, the present invention aims to provide a public telephone that allows the user to instantly know how many minutes they have left to talk.

(Means for solving the problems) In order to solve the above problems, the public telephone according to the present invention has the following features:
As long as there is a balance left on the inserted money or card, calls can be made off-hook, and the call can be terminated on-hook.The call time per unit amount is determined according to the charge signal sent during a 19 call at a public telephone. Remaining time calculation for calculating the remaining talkable time during a call and displaying it on a display based on the unit time calculation unit to calculate, and the remaining talkable time per unit amount obtained by the unit time calculation unit and the remaining amount. It is characterized by having a section.

(Embodiment) FIG. 1 is a perspective view showing an actual public telephone IMVA according to the present invention.

The public telephone 1 shown in this figure calculates the talkable time (unit talkable time) per unit amount (for example, 10 yen) based on the repetition interval of the charging signal (pulse) sent from the central office during a call. At the same time, the remaining talkable time during the call is calculated and displayed by multiplying this unit talkable time by the remaining amount of the inserted card.
The telephone includes a telephone main body 2 and a handset 3.

The telephone main body 2 is provided with a card insertion slot 4, a card return slot 5, a dial key 6, and a display 7 on its customer service side, and after the handset 3 is removed from the hook, the card can be inserted. While the card is inserted into the slot 4 and there is a balance on the card, the call circuit is turned on to enable a call to the other party specified by the dial key 6, and the remaining talk time is determined during the call. is displayed on the display 7, and when the handset 3 is hung on the hook or the remaining balance becomes zero, the call is hung up and the card is returned from the card return slot 5. Inside, as shown in FIG. 2, a telephone call circuit 8, a telephone call control circuit 9, a billing signal receiving circuit 10, a remaining call time calculation section 11, and a remaining call time display section 12 are provided.

The communication circuit 8 connects the handset 3 and a communication network,
It is equipped with an audio amplifier for making calls.

The telephone call ti111M1 circuit 9 is a circuit that is in charge of preventing collisions between incoming and outgoing calls, unauthorized outgoing calls, and unauthorized calls. , and supplies a control signal to the communication circuit 8 to connect, hold, or disconnect the communication loop including the communication circuit 8.

The charging signal receiving circuit 10 receives the charging signal output from the charging signal transmitting device 13 on the station side when the call control circuit 9 turns on the calling circuit 8. , and supplies this to the remaining call time calculation section 11.

Every time the remaining call time H1 calculation unit 11 receives a billing signal, it subtracts 111 charges from the remaining amount on the card (or the remaining amount on the card stored in the memory) to obtain a new remaining amount and starts a call. The method measures the repetition period of the subsequent billing signal, calculates the product of this measurement result and the new remaining amount, and then rounds this product down to the nearest minute to determine the remaining talkable time. The time is supplied to the remaining call time display section 12.

The remaining talk time display section 12 receives the remaining talkable time and displays it on the display section 7, and by this display, the user who is talking can instantly know how many more minutes he or she can talk.

In addition, in the above-described embodiment, the repetition period of the charging signal is measured at the time when the charging signal is supplied, but since the repetition period of the charging signal after the start of a call is usually constant, this repetition period is initially measured. When measuring the period,
If this is stored in memory, the number of measurements can be made only once.

(Effects of the Invention) As explained above, according to the present invention, it is possible to obtain the effect that the user can instantly know how many minutes left to speak.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a block diagram showing an example of the circuit configuration of the same embodiment. 7...Display device, 8...Telephone circuit, 11...Unit time calculation unit, remaining time calculation unit (remaining call time calculation unit).

Claims (1)

[Claims] In public telephones that allow calls off-hook and end calls while on-hook while there is a balance left on the inserted money or card, the callable time per unit amount is determined according to the charging signal sent during a call. Remaining time calculation for calculating the remaining talkable time during a call and displaying it on a display based on the unit time calculation unit to calculate, and the remaining talkable time per unit amount obtained by the unit time calculation unit and the remaining amount. A public telephone characterized by comprising: