CN2192994Y - Charging telephone - Google Patents

Abstract

The utility model relates to a message accounting device of a telephone, particularly a message accounting device with dual functions of message accounting and call, namely a message accounting telephone. The utility model comprises a microprocessor, a program memory, a data memory, an I/O interface and a telephone set circuit. A keyboard is connected with the microprocessor via a keyboard interface circuit, and the program memory of the microprocessor and the data memory is connected with the chip of a telephone code sending circuit in a telephone circuit via a matrix interface. The utility model has the advantages of novel structure, integration with the function of message accounting and a telephone, convenient operation, accuracy of message accounting, etc.

Description

Charging telephone

The utility model relates to a kind of telephone charge counter, particularly relates to a kind of telephone charge counter with call function, i.e. Charging telephone.

The connected mode of existing telephone charge counter is that taximeter is between switch and communication equipment terminal (referring to telephone).That is to say that its suitable four-terminal network is imported two termination switches, exports two termination general user telephone sets, its inside constitutes microprocessor, memory under program, data memory, timer (being included in processor inside), I/O interface circuit.Subsets are transferred to switch with outgoing call by taximeter, and taximeter has write down outgoing call simultaneously.Switch is delivered to the purpose that taximeter reaches charging with called off hook signal.

Taximeter is when transmitting signal, and the anti-polar signal (electric polarity is opposite with initial condition) by the switch feedback is come starts microprocessor work, adds writing time and takes advantage of rate, finally calculates the expense of conversation.Though existing telephone charges practical, but owing to be the unit form, problem below inevitable existence the: at first be the error of omission cost of the phone call, this mainly is because switch drain passes anti-polar signal, though can normal talking, accounting routine is not activated, thereby can not normal billing, next is because the user must cause expense to increase to message accounting and twice investment of telephone set.

The purpose of this utility model is to provide a kind of telephone charge counter that not only can overcome above-mentioned deficiency but also strengthen the reliability of system, i.e. Charging telephone.

The utility model includes microprocessor, memory under program, data memory, I/O circuit and phone circuit, be characterised in that keyboard joins by keyboard interface and microprocessor, wherein a key is for forcing key for keyboard, and memory under program and data memory join by phone signaling circuit chip in fabric interface circuit and the phone circuit.

Advantages such as it is accurate, reliable to the utlity model has charging, does not fail to record ticket and charging, and phone unites two into one, and cost is lower, and telephone office is manageable.

Accompanying drawing 1 is an electrical schematic diagram of the present utility model.

Accompanying drawing 2 is block diagrams.

The utility model will be further described below in conjunction with accompanying drawing.

Fig. 2 is the whole block diagram of Charging telephone, and it is divided into three parts: receive bell part, phone part, computer part.

Receive bell and partly comprise receipts bell circuit and electric bell, be responsible for receiving ringing signal and also start the electric bell sounding.

The phone part is the same with the plain old telephone machine circuit, is responsible for sending and receiving voice signal, controlled by microprocessor but send voice signal here.When anti-polar signal (fee charging signal) arrived or presses " forcing " key, microprocessor just allowed to send voice signal.

Microcomputer circuit is the major part of Charging telephone.It comprises microprocessor, display, memory, keyboard and signaling circuit, microprocessor is equivalent to the brain of this part, it is responsible for receiving various signals, and with these information storages in memory, constantly carrying out logic analysis judges, after drawing correct conclusion, the work of control various piece, for example, when the user carries the machine button microprocessor immediately with these keypad code information storages in memory, and by the signaling circuit to outside line send the user by keypad code, simultaneously send signal to display, show and send out a number number.

In Fig. 1, U2 is a microprocessor, and U3 is address latch (addressing is used), and U4 is a memory under program, and U16 is a data memory, and U31 is the I/O interface, and U14 is an address distributor, all has in the former taximeter of said integrated circuit, and wiring is identical.The below of figure is a phone circuit, is the regular phone machine circuit, and U25 is a phone signaling circuit, and U29 is the telephone set chip, and U21 is an integrated amplifier, and U11 is for receiving the bell circuit, and U22 is a LCD interface, and U24 is the printer socket.A keyboard K(wherein key can be provided with arbitrarily for forcing key) join by keyboard interface U18 and microprocessor U2, memory under program U4, data memory U16 join with phone signaling circuit chip U25 by fabric interface circuit U 19.FH1 is a mouthpiece, and SP2 is for being subjected to microphone.

Set forth its operation principle below.

Predetermined keyboard scan signal among the utility model U2, scanning information is latched among the interface circuit U18 by latching line by address bus.When the user presses keyboard dialing, interface circuit U18 send signal among the U2, procedure identification by the U4 memory under program, microprocessor U2 gating matrix interface circuit makes it corresponding node closure, send dialing signal (going to switch) by phone signaling circuit chip U25 to a, b line (phone interface) then, this is the number process of transmitting.

The identification of anti-polar signal: when user's off-hook, the polarity of a, b line is sent among the U2 by photoelectrical coupler IS01 and ISO2, when called subscriber's off-hook, switch is sent anti-polar signal (opposite with initial condition polarity) here, the state counter-rotating of ISO1 and ISO2, thereby recognize called subscriber's off-hook, pick up counting, meanwhile I/O interface U31 sends control signal, and transistor Q7 conducting Q6 is ended, FH1(send microphone) power up, the user gets final product normal talking.

If Subscriber Number has been dialled, the called subscriber is off-hook, and switch is not sent " anti-polar signal " here or do not had anti-polar signal, this moment, the utility model can only hear that the other side talks, and can not give orders or instructions, as long as at this moment the user presses and forces key, microprocessor reads in the user and forces key signals, be compelled to work immediately, control I/O interface U31 sends control signal, make the Q7 conducting, Q6 ends, and FH1 powers up, and makes user both sides' normal talking.

Above-mentioned anti-polar signal and force key signals all can make the charging operate as normal, and accurately calculate cost of the phone call, expense can be used liquid crystal display, also can get with printer.

The utility model does not have specific (special) requirements to resistance, electric capacity, transistor, and market is all on sale.

U2 can be 8031, U3 can be that 74HC373, U4 can be 2764, U16 can be that 74HC373, U31 can be that 74HC373, U18 can be that 74HC373, U14 can be that 16V8, U19 can be that CD22100, U29 can be that TEA1062, U25 can be that UM91210, U21 can be that LM386, U11 can be that KA2410, U22 can be 1602, U24 can be 16PIM.Certainly they also can use other integrated circuit, use said integrated circuit, can be used as an embodiment of the present utility model.

Reliability is set forth:

This Charging telephone realizes that the reliability of chargeing is guaranteed by " artificial strong meter " mode.Because " artificial strong meter " is passive type, realize by calling party's button, do not remove to trigger " artificial strong meter " as the calling party, as long as Charging telephone is not activated Fare determined by travel time, so, this machine can only hear that the other side talks and can not give orders or instructions, and with this calling party must be started by button, thereby guaranteed the reliability that starts, accomplished not leak ticket.

Claims (1)

1. A kind of Charging telephone, contain microprocessor U2, memory under program U4, data memory U16, I/O circuit and phone circuit, it is characterized in that keyboard K (wherein a key is for forcing key) joins by keyboard interface circuit U18 and microprocessor U2, and the memory under program U3 of microprocessor U2 and data memory U4 join with phone signaling circuit chip U25 in the phone by fabric interface circuit U 19.

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