CN2198727Y - Pulse to two voice frequency automatic changing telephone set - Google Patents

Abstract

The utility model relates to a pulse to two voice frequency automatic changing telephone set, which is provided with a ringing circuit, a rectifying circuit, a dialing circuit, a communication circuit, keys, a hook switch and a shell body. The utility model is characterized in that an automatic changing module composed of detection circuits and control circuits is connected with signal lines in parallel after the rectification of the rectifying circuit is finished, and the output of the automatic changing module is connected with a dialing chip in the dialing circuit. The utility model reserves all characteristics of a two voice frequency telephone set, and can particularly establish a talking cord circuit in a pulse dialing mode. After the cord circuit is established, the utility model can automatically change into the telephone set which sends key signals in the two voice frequency mode so as to fit the requirements of various new telephone services.

Description

Pulse to two voice frequency automatic changing telephone set

The utility model relates to a kind of phone.

At present, both at home and abroad the dial mode of phone is divided into pulsed and double-tone two kinds of formulas frequently.It is generally acknowledged that dialing is and a kind of means of switch contact with foundation conversation cord circuit, after the conversation cord circuit is set up, be that both sides are can converse the time, dial-up circuit is ineffective, but many telecommunication services of current appearance all require after cord circuit is set up, continue to send relevant signal to the opposing party with dial-up circuit, the Private Branch Exchange PBX that comprises various subscribers feeder trunking schemes requires to dial extension number, phone is entrusted, corresponding service item is selected in dialing in the Help by Phone, mailbox is selected in dialing in the voice mail, the beeper automatic paging, remote telephone uses dial-up circuit to send control routine etc.Telephone set for pulse dialing, the pulse signal that its dialing produces can transmit distortion rapidly because of long distance after cord circuit is set up, so that the other side is difficult to identification, and dual tone phone machine dialing is sent is frequency signal, by long Distance Transmission, the other side still can easily detect the signal that is sent.Therefore, above-mentioned every new business almost requires bar none after the conversation cord circuit is set up, and uses double-tone frequency mode to send desired signal.The switch that uses in China, great majority be can only the received pulse signal the pulse system switch, for the switch that internal institution uses, then almost all be the pulse system switch.This just produces a contradiction, and a large amount of pulse system switch requests that use are set up cord circuit with pulse dialing in China, for this switch, uses the dual-tone dialing telephone set can't set up the conversation cord circuit.On the other hand, after cord circuit is set up, as mentioned above, require to use double-tone frequency mode to send signal again, to obtain the emerging service of modern science and technology to the other side.Current, a kind of telephone set with two class dial modes has appearred on the market, and its typical structure is formed ringing circuit, rectification circuit, dial-up circuit, speaking circuit, hook switch, button, housing.This phone is selected dial mode with a toggle switch, in the time of in being connected on pulse system switch telephone network, switch is dialled to " P " end and is used the pulse mode dialing, if be connected on double-tone when making in the switch telephone network frequently, switch dial to " T " end use double-tone frequently mode dial.The original idea of its design is the needs that adapt to different switches, sets up cord circuit so that can both dial in two kinds of telephone networks.But in order to remedy above-mentioned contradiction, as a kind of flexible usage, pulse system switch for a large amount of uses, can be when setting up cord circuit, the strobe pulse dial mode, after cord circuit is set up, toggle switch becomes the signal that double-tone frequency mode requires with transmission the other side, but this is very inconvenient, two kinds of dial modes because most user does not know to have taken on the telephone at all, even if know this point, also have only the people of only a few to know which kind of dial mode of this use under which kind of mode, let alone, because the toggle switch time is incorrect, cause phone not use, and send the loss that wrong answer signal brings to the user.

The purpose of this utility model provides a kind of use pulse dialing before the conversation cord circuit is set up, and converts the telephone set of dual-tone dialing after the conversation cord circuit is set up automatically to, is compatible with general dual tone phone machine simultaneously again.

The technical solution of the utility model is such: between the holding wire after the rectification circuit rectification with two class dial mode telephone sets, and automatic modular converter in parallel, it is made up of testing circuit and control circuit.Testing circuit is from numerous operating states of circuit, identifying circuit connects and the line idle two states, control circuit is with the detected signal of testing circuit, the control signal that changes into a definite form goes to select dial mode, it has memory function simultaneously, to keep control, dial mode is changed frequently in pulse and double-tone to dial-up circuit.Frequently make switch in order to be compatible with double-tone, kept selector switch, dial when " T " holds, just become dual tone phone, be applicable to that the double-tone that can receive double-audio signal makes switch frequently when switch; Dial when " P " holds when switch, just become and have pulse to the double-tone telephone set of auto-conversion function frequently, it is applicable to the pulse system switch, this phone is set up cord circuit with pulse dialing, cord circuit can be automatically converted to the dual-tone dialing mode after setting up, so that send desired signal.

Frequently to make switch still be the pulse system switch to the utility model no matter be used for double-tone, can both guarantee that the user normally sets up under the situation of conversation cord circuit, different conditions according to cord circuit, automatically change dial mode, so that the user after cord circuit is set up, can send the signal that the other side can discern freely and obtain all kinds of emerging telecommunications service.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is a theory diagram of the present utility model;

Fig. 2 is automatic modular converter circuit diagram.

With reference to Fig. 1, ringing circuit 1 of the present utility model is connected in parallel on the two ends of telephone wire, produces ring when the phone incoming call is arranged.2 pairs of input signals of rectification circuit carry out rectification.Automatically the testing circuit 3 of modular converter is connected between holding wire after rectification circuit 2 rectifications, identifying circuit from numerous operating states of circuit connects and the line idle two states, with detected off status arranged by control circuit 4, the control signal that changes into a definite form goes to select dial mode, has memory function simultaneously, to keep control to dialing chip in the dial-up circuit 5.Here require the dialing chip should have two kinds of dial modes, by control to its selecting side, its dial mode is changed frequently in pulse and double-tone, the dialing chip is accepted the input of button 6 simultaneously, and will send into speaking circuit 7 and control circuit 4 about signal, the function of speaking circuit 7 is to finish both sides' conversation.

Work as line idle, then indicating next time the arriving of dialling, setting up cord circuit, the dial mode of this moment should be a pulse mode, and after testing circuit detected this state, by the conversion of control circuit 4, the dial mode of control dialing chip was a pulse mode; If after detecting the circuit on-state, by the conversion of control circuit 4, the dial mode of control dialing chip is converted to double-tone mode frequently; If pulse dialing finishes, detect the cord circuit access failure, circuit will not have operation, and dial mode remains unchanged, and becomes aforesaid line idle state again if the user depresses hook switch 8.

In addition, as another kind of implementation, control circuit also can cooperate the output of testing circuit 3 to discern the cord circuit state with the state of hook switch 8 as a kind of input, and at this moment, dial-up circuit 4 can be to the control circuit backhaul signals.

In frame of broken lines among Fig. 2, it has provided a kind of implementation method of the automatic modular converter that testing circuit 3 and control circuit 4 are formed among Fig. 1, wherein audio decoder IC ₁, not gate g ₁, g ₂, g ₃, triode T ₁, diode D ₁, D ₂, D ₃, resistance R ₁, R ₂, R ₃, R ₄, R ₅, R ₆, R ₇, capacitor C ₁, C ₂, C ₃, C ₄, C ₅Form testing circuit 3, trigger IC ₂, with the door g ₄, or the door g ₅, not gate g ₆ Form control circuit 4, audio decoder IC ₁Model be LM567, trigger IC ₂Model be 74LS74.Conversion components and parts and corresponding composition can obtain multiple realization circuit, but its basic principle is connected and line idle two class states nothing more than circuit on the signal lines, and the certain control signal of corresponding generation, act on dialing chip with two kinds of dial modes, strobe pulse or dual-tone dialing mode are to reach the purpose of automatic conversion.IC wherein ₃It is the dialing chip in the dial-up circuit 5; SW is the manual selection switch of original double-tone frequency of phone or pulse dialing method.

Automatically the course of work of modular converter is such, when phone is idle, is high level on the circuit, triode T ₁Collector electrode is output as " 0 ", and model is the dialing chip IC of HM9102/A ₃Quiet (mute) output be " 0 ", or the door g ₅The trigger IC of output " 0 " set model 74LS74 ₂Make it to be output as " 1 ", if selector switch SW dials the end at " P ", then with door g ₄Be output as " 1 ", send into the dialing chip IC ₃Mode selection terminal (mode), its corresponding dial mode is a pulse mode, the signal that transfer to this moment is a pulse signal.If selector switch SW then becomes the dual tone phone machine at " T " end, a whole set of circuit is invalid.

After pulse dialing finishes, connect as circuit, on the cord circuit with loopback " ring-back tone ", at this moment not gate g ₁The square wave that output frequency is lower (high level 1 second, low level 4 seconds), this high level that reaches 1 second is through resistance R ₄Give capacitor C ₅Charge to high level, not gate g ₃Output is uprised by low, and this rising edge of a pulse triggers trigger IC ₂, make output Q become " 0 ", with door g by " 1 " ₄Output " 0 ", control dialing chip IC ₃Mode selection terminal (mode), make dial mode become double-tone mode frequently.If FD finished dialing, circuit are illogical, loopback " busy tone ", then not gate g ₁Output frequency higher (high-low level respectively is 0.35 second), deficiency makes capacitor C ₅On level be charged to high level, so trigger IC ₂Do not trigger, dial mode remains pulse mode, and in any case, in a single day the user puts machine and do not dial, i.e. set flip-flop IC by force ₂, make it be output as " 1 ", then with door g ₄Also output " 1 ", dial mode becomes pulse dialing method.

Claims (3)

1, a kind of pulse is to the automatic frequently telephone set of changing of double-tone, comprise ringing circuit [1], rectification circuit [2], dial-up circuit [5], button [6], speaking circuit [7], hook switch [8], housing, it is characterized in that between the holding wire after rectification circuit [2] rectification, automatic modular converter of forming by testing circuit [3], control circuit [4] in parallel, output connection dial-up circuit [5] of its control dial mode.

2, pulse according to claim 1 is characterized in that to the automatic frequently telephone set of changing of double-tone said testing circuit ［ 3 ］ is mainly by audio decoder ［ IC ₁, not gate ［ g ₁, g ₂, g ₃, triode ［ T ₁, diode ［ D ₁, D ₂, D ₃, resistance ［ R ₁, R ₂, R ₃, R ₄, R ₅, R ₆, R ₇, electric capacity ［ C ₁, C ₂, C ₃, C ₄, C ₅Form.

3, pulse according to claim 1 is characterized in that to the automatic frequently telephone set of changing of double-tone said control circuit ［ 4 ］ is by trigger ［ IC ₂, with the door ［ a g ₄Or door ［ g ₅, not gate ［ g ₆Form.

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