CN2166564Y - Fee-metering and anti-illegal adding telephone set apparatus for domestic telephone - Google Patents

Abstract

The utility model relates to a fee-metering and anti-illegal adding telephone set apparatus for a domestic telephone, which is composed of a telephone set interface circuit, a 51 series single-chip computer, an intermittent operation control circuit, a liquid crystal display unit, a start control circuit, a standby power supply switching circuit, and a DTMF transceiver. The utility model uses batteries as a power supply, and can realizes multiple practical functions such as time and fee metering, data storage, data protection when the batteries are changed, and alarm when a telephone set is illegally added by using the simplest circuits.

Description

Fee-metering and anti-illegal adding telephone set apparatus for domestic telephone

This device belongs to the telephony field, be used for user itself calculate telephone charges with and prevent from illegally to add phone.

At present, home telephone is very universal, and particularly along with the development of telecommunications, home telephone will be obtained swifter and more violent development.Yet user and telecommunication department dispute quantitatively often occurs paying telephone charges.Reason mainly contains the following aspects, and the one, in paying the fees the Account Disposal process, phone makes a fault; The 2nd, illegally added phone in the subscriber's line; The 3rd, user record is wrong.Though reason is many-sided, the user ascribes the dispute reason to arbitrary imposition of fees mostly, and this will be a problem of home telephone development.As seen, be badly in need of being equipped with the pocket Telephone Time-Count of a kind of family practicality, the device that charges and prevent from illegally to add phone.Another aspect, electricity have ammeter, water to have water meter, taxi that taximeter is arranged, and in this sense, subscriber phone is equipped with timing, to charge and prevent from illegally to add the phone device also be that the institute of gesture becomes, and easily are everybody acceptance.

The purpose of this utility model, just provide a kind of easy and simple to handle, calculate accurately, not to be subjected to have a power failure and influence, by the long-distance call of single-chip microprocessor control, local telephone network timing, the device that charges and prevent from illegally to add phone.

The utility model is made up of phone machine external tapping circuit, DTMF transceiver (MT8870), single-chip microcomputer 80C51, stand-by power supply commutation circuit, start-up control circuit, RAM, liquid crystal display, clearance-type working control circuit, warning circuit etc.

The interface circuit (see figure 2) is made up of photoelectric coupled device A, diode B, capacitive interface G, resistance C, D and inverter E, F.Machine is carried in user's caller, the called signal of interests such as dial impulse of carrying machine and Pulse Electric phone reach the voltage that is measured by a ', b ' two ends by A, and information is inputed to the 80C51 single-chip microcomputer, thereby realizes timing.Specifically, when machine is carried in caller, at D two ends output voltage by high step-down, simultaneously, photoelectrical coupler A conducting; Dialing information can be collected simultaneously from A and D two ends, can prevent from better to disturb.Carry machine when conversation when called, a ', b ' both end voltage polarity become anti-, and A turn-offs simultaneously.Afterwards, if a ', b ' both end voltage uprises suddenly then for The Calling Party Hooks On, by audio signal identification, also can judge Called Onhook.If main dialing telephone is a double-tone phone frequently, then its dialing information reaches DTMF transceiver (MT8870) by G, and the output of this transceiver can directly meet 80C51, thereby realizes the double-tone identification of phone telephone number frequently.Prevent from illegally to add the phone function and judge together, if the illegal receiver off-book that adds, then A place no current and a ', b ' both end voltage step-down by a ', b ' both end voltage and the current signal that flows through A.

Composition frame chart of the present utility model is seen Fig. 1, and by the information among the interface circuit input 80C51, after routine processes, an aspect is sent into liquid crystal display 9 and shown, can show its air time simultaneously when the user makes a phone call.On the other hand, air time and telephone number corresponding will deposit in the random asccess memory 5.Even random asccess memory also can make data keep considerable time under the situation of main system power down (as changing battery).

As the family expenses metering device, the utility model solves following technical problem emphatically.

1,, adopts minimum Single Chip Microcomputer (SCM) system as far as possible, and adopt the simplest implementation method for reducing cost.

2, for the accuracy that guarantees to measure with regard to otherwise had a power failure, the influence of problem such as main line fault, for this reason, the utility model adopts No. 1 powered battery also to solve the problem that reduces system power dissipation.One of measure is the CMOS chip that all chips adopt low-power consumption as far as possible; It two is that whole system adopts substation to carry machine to start and single-chip microcomputer clearance-type working method.The clearance-type working control circuit is made up of crystal oscillator CD4060 and frequency dividing circuit CD4040.

3, stand-by power supply adopts chargeable battery.Before the main power source power down warning is arranged, in time changes battery to remind the user, if the user does not change the battery of dead electricity for a long time, the utility model will be in software mark, thereby also make the data of its record invalid.

Above-mentioned measures will fully guarantee practicality and the authority of the utility model as the telephone charges metering device.

The utility model can be shown easily that by button it can show total talk times, total air time, long-distance call talk times and total time, local telephone network talk times and total time.Go through as need, then can show the telephone number and the corresponding air time of each conversation.

Claims (2)

1, a kind of monolithic processor controlled local telephone network, long-distance call family expenses charge and prevent from illegally to add and the device of phone it is characterized in that it comprises:

A, from the phone the phone machine external tapping circuit of acquisition of information;

B, employing 80C51 or PIC16C5X single-chip microcomputer series need not to add in addition EPROM in the system;

C, power supply are provided and are provided with RAM power down protection circuit by battery;

D, start-up control circuit and gap working control circuit;

E, obtain double-tone information frequently by the MT8870 chip;

F, warning circuit;

The decoder and the address latch of G, necessity.

2, charge according to the said home telephone of claim 1 and prevent from illegally to add the phone device, it is characterized in that described phone machine external tapping circuit comprises:

A, receive phone information by being serially connected in a diode, the photoelectrical coupler in the phone circuit and being attempted by two electric capacity in the phone circuit (a ", b " meets MT8870), these information comprise the machine of proposing, conversation, on-hook, and this interface is adapted to pulse and double-tone frequency phone;

B, realize judgement to illegal adding phone by being connected in parallel on two divider resistances, inverter and aforesaid photoelectrical coupler in the phone circuit.

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