CN2682743Y

CN2682743Y - Incoming call detector for dial-up subscriber

Info

Publication number: CN2682743Y
Application number: CN 200420021010
Authority: CN
Inventors: 林炜
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-03-18
Filing date: 2004-03-18
Publication date: 2005-03-02
Anticipated expiration: 2014-03-18

Abstract

The utility model relates to an incoming call detector for dial-up subscriber, comprising a power, a driving and executing part (3), a signal detecting part (2) which can check out the signal of the waiting tone and output the trigger signal. The output terminal of the signal detecting part (2) is connected with the input terminal of the driving and executing part (3), wherein, the input terminal of the band filter unit (8) is connected with the telephone circuit in parallel; the output terminal of the band filter unit (8) is connected with the input terminal of the rectifying detecting unit (9); the output terminal of the rectifying detecting unit (9) is connected with the input terminal of the comparative triggering unit (10); the output terminal of the comparative triggering unit (10) is connected with the input terminal of the driving and executing part (3). The utility model has the advantages that the detecting part can check the waiting tone signal transferred by the telephone exchange office and can notify the users when the users are online, and thus, the problem that the online users can not be contacted are solved.

Description

The dial-up user detects the device of incoming call

Technical field

The utility model relates to electronics and telecommunication technology.Relate in particular to the incoming call detection technique in the telecommunications service.

Background technology

At present in the user who dials up on the telephone, exist the problem that others dials in when online phone can't in time be answered, though and some user has the call waiting function of incoming call, but owing to there is not the prompting of incoming information, therefore also can't incoming call answering, so still the problem that others can't incoming call connection that do not solve when online.

Summary of the invention

The purpose of this utility model is to have under the situation of call waiting function for addressing the above problem, make the user who dials up on the telephone, and can in time detect the calling of incoming call, incoming call answering and a kind of dial-up user of designing detects the device of incoming call.

When the user that call waiting function is arranged uses phone, no matter be conversation, when still dialling up on the telephone, if someone dials into again, telephone call office can transmit call waiting tone audio signal clocklike to substation on the telephone wire of same road, be that frequency is 450Hz, sending the disconnected cycle of 4s with 0.4s is the stand by tone signal of 4.4s, the audio signal of the call waiting tone that in the specification of the present utility model telephone call office is transmitted to substation on telephone line abbreviates the stand by tone signal as, the time width of stand by tone signal is 0.4s, the utility model detects incoming call by detecting this stand by tone signal, and after detecting incoming call, notify the user directly or indirectly.

The utility model is finished the technical scheme that purpose adopted that detects incoming call for the dial-up user: a kind of dial-up user detects the device of incoming call, comprise power unit, driving operating part and the bandwidth-limited circuit formed by driver element and performance element, the rectification circuit, pierce circuit, counter circuit, integrator circuit, Schmitt trigger circuit, monostable flipflop circuit etc., it is characterized in that: various circuit are formed the input part that can detect the stand by tone signal and export triggering signal, and the output of input part connects the input that drives operating part; Described signal detecting part branch comprise can be by the stand by tone signal the bandpass filtering unit, can to wait for tone signal carry out rectification and export direct current signal the rectification unit, can detect the dc pulse signal of stand by tone signal time width and the timely comparison trigger element of output triggering signal; Wherein, the input of bandpass filtering unit is connected in parallel on the telephone line, the output of bandpass filtering unit connects the input of rectification unit, and the output of rectification unit connects the relatively input of trigger element, and relatively the output of trigger element connects the input that drives operating part; The dc pulse signal that described relatively trigger element can be a stand by tone signal time width reaches through the integrator integration and makes relatively trigger element of integration that trigger triggers behind the threshold values of setting, also can be that the counter of setting the input counting pulse signal overflows in stand by tone signal time width and the counting that triggers trigger element relatively; Performance element can be ring or voice suggestion integrated circuit in the described driving operating part, also can be the relay or the electronic switch (comprising bidirectional thyristor, bidirectional field-effect pipe, bidirectional analog switch integrated circuit etc.) of the modulation-demodulation device that is used for interrupting dialling up on the telephone (comprising the modulator-demodulator that computer is external and the modem card of interpolation) telephone wire.

The beneficial effects of the utility model: because the part of the input in the utility model can detect the stand by tone signal that telephone call office sends when the user surfs the Net, and in time directly with ring or after disconnecting the modulation-demodulation device that dials up on the telephone, make the mode of ringing telephone stations notify the user indirectly, thereby solved user's problem that others can't incoming call connection when surfing the Net.

Description of drawings

Fig. 1 detects the telephone connection block diagram of the device of incoming call for a kind of dial-up user.

Fig. 2 detects the schematic block circuit diagram of a kind of input part in the electric installation for the dial-up user.

Fig. 3 detects the schematic block circuit diagram of another kind of input part in the electric installation for the dial-up user.

Fig. 4 detects the schematic block circuit diagram of another input part in the electric installation for the dial-up user.

Fig. 5 is the circuit diagram of a kind of bandpass filtering unit in the input part.

Fig. 6 is the circuit diagram of another kind of bandpass filtering unit in the input part.

Fig. 7 detects a kind of circuit diagram of input part in the electric installation for the dial-up user.

Fig. 8 detects the another kind of circuit diagram of electric installation for the dial-up user.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

The telephone connection block diagram that a kind of dial-up user of the present utility model detects electric installation is as shown in Figure 1: subsets 4 in parallel and dial-up user detect the input of the input part 2 in the electric installation 1 on the telephone line, telephone wire detects the electronic switch that drives operating part 3 in the electric installation 1 through the dial-up user, with the modulation card connection of computer 5 interpolations; 6 is telephone call office's house lead in end; The output of input part 2 is connected with the input that drives operating part 3.When user's active computer 5 dials up on the telephone, when phone is dialled in, telephone call office can transmit stand by tone signal clocklike to substation through house lead in end 6 on telephone wire, when being connected in parallel on after input part 2 on the telephone wire detects the stand by tone signal, trigger and drive operating part 3, disconnect electronic switch, promptly disconnect being connected of modem card of telephone line and computer 5 interpolations, the bell signal of telephone call office can drive subsets 4 rings subsequently, has phone to dial in to notify the user.

The schematic block circuit diagram that dial-up user of the present utility model detects a kind of input part in the electric installation is as shown in Figure 2: the input of bandpass filtering unit 8 is connected in parallel on the telephone wire 7, the output of bandpass filtering unit 8 connects the input of rectification unit 9, the output of rectification unit 9 connects the relatively input of trigger element 10 of integration, and integration is the input 12 of the output connection driver element of trigger element 10 relatively; The operation principle of input part is: the stand by tone signal on the telephone wire 7 is by bandpass filtering unit 8, the 9 output direct current signals through the rectification unit, the dc pulse signal of stand by tone signal time width triggers trigger reach the threshold values of setting through the integrator integration after, and the output pulse triggering signal is given the input 12 of driver element.

The schematic block circuit diagram that dial-up user of the present utility model detects another kind of input part in the electric installation is as shown in Figure 3: the input of bandpass filtering unit 15 is connected in parallel on the telephone wire 7, the output of bandpass filtering unit 15 connects the input of rectification unit 16, the output of rectification unit 16 connects the input of voltage comparator 17, the output of voltage comparator 17 connects the input of timing comparator 18, the output of timing comparator 18 connects the input of trigger element 19, and the output of trigger element 19 connects the input 12 of driver element; The stand by tone signal is by bandpass filtering unit 15, the 16 output direct current signals through the rectification unit, the dc pulse signal of stand by tone signal time width makes trigger element 19 trigger behind the timing threshold values that reaches timing comparator 18 settings after voltage comparator 17 compares.

The schematic block circuit diagram that dial-up user of the present utility model detects in the electric installation another input part is as shown in Figure 4: the input of bandpass filtering unit 20 is connected in parallel on the telephone wire 7, the output of bandpass filtering unit 20 connects the input of rectification unit 21, the output connection count of rectification unit 21 is thresholding (or zero clearing) input of trigger element 23 relatively, counting is the input 12 of the output connection driver element of trigger element 23 relatively, and the output connection count of count pulse generating unit 22 is the count pulse input of trigger element 23 relatively; The operation principle of input part is: the stand by tone signal on the telephone wire 7 is by bandpass filtering unit 20, the 21 output direct current high level pulse signals through the rectification unit, both exported direct current high level pulse signal with stand by tone signal time width, the counter of setting input count pulse generating unit 22 counting pulse signals overflows in the stand by tone signal time width of the high level pulse signal of rectification unit 21 outputs and trigger is triggered, and the output pulse triggering signal is to the input 12 of driver element; And other signal on the telephone wire 7 can not pass through bandpass filtering unit 20, that is to say and to make rectification unit 21 output direct current high level pulse signals, so counter is not counted, even the clutter that has can pass through bandpass filtering unit 20, but the burst length width of the direct current high level pulse signal that the burst length width of the direct current high level pulse signal that noise signal is exported after the rectification shaping is produced less than the stand by tone signal, so counter can not overflow yet, thereby got rid of the interference of other noise signal, guaranteed to have only the stand by tone signal of telephone call office could trigger startup.

In the input of the present utility model part circuit diagram of a kind of bandpass filtering unit as shown in Figure 5, the resonance frequency of this filter can be regulated by gang potentiometer, resonance frequency can change to 1.5KHz from 150Hz; For ease of calculating, potentiometer is threaded to the upper end, the resonance frequency Fo=1/2 π RC of filter, wherein, C=C1=C2, R=R1=R2.

In the input of the present utility model part circuit diagram of another kind of bandpass filtering unit as shown in Figure 6, the resonance frequency of this narrow band filter can be regulated by R1, R2 wire-wound gang potentiometer, resonance frequency can change to 1.6KHz from 160Hz; The resonance frequency Fo=1/2 π √ R1R2C1C2 of narrow band filter, regulator potentiometer R3 can change the Q value of circuit.

The filter of Fig. 5, Fig. 6 is a prior art, can consult " integrated electronic line design handbook " ISBN7-5335-1934-5/TN.255 of publishing Fujian science tech publishing house in May, 2002 the 168th page.

Dial-up user of the present utility model detect the part of input in the electric installation a kind of embodiment circuit diagram as shown in Figure 7: comprise relatively trigger element 103 of bandpass filtering unit 101, rectification unit 102, integration, the second order voltage controlled voltage source band pass filter circuit that bandpass filtering unit 101 is formed for operational amplifier IC1, rectification unit 102 comprises rectifier diode D and RC detecting circuit, and integration comparison trigger element 103 comprises the noninverting integrator of being made up of operational amplifier IC3 and is used for shaping and anti-phase Schmidt's input nand gate IC2; The input Vi of bandpass filtering unit 101 is connected in parallel on the telephone line, the output of bandpass filtering unit 101 is the rectifier diode D that the output of operational amplifier IC1 connects rectification unit 102, rectifier diode D connects the RC detecting circuit, the RC detecting circuit connects the potentiometer W1 of rectification unit 102 outputs, the potentiometer W1 output of rectification unit 102 connects the relatively 1A of the Schmidt trigger of trigger element 103 inputs of integration, the 2Y of the Schmidt trigger of input connects the resistance R 7 of noninverting integrator input, the noninverting integrator output is that the output of operational amplifier IC3 connects the relatively 3A of the Schmidt trigger of trigger element 103 outputs of integration through potentiometer W2, and the 3Y of the Schmidt trigger of output connects the input that drives operating part.

After user's online, when people's incoming call is arranged, telephone call office's transmission frequency on telephone line is the stand by tone signal of Fo, and the second order voltage controlled voltage source band pass filter circuit of bandpass filtering unit 101 can only allow the frequency be that the audio signal of Fo=1/2 π C √ 1/R3 (1/R1+1/R2) (C=C1=C2 in the formula) is passed through, the audio signal of the band pass filter circuit by bandpass filtering unit 101 is through the rectifier diode D and the RC detecting circuit output direct current signal of rectification unit 102, direct current signal is through Schmidt's input nand gate IC2 shaping output constant amplitude direct current high level signal, adjusting potentiometer W1 can make the stand by tone signal be constant amplitude direct current high level pulse signal after the rectification shaping, the noninverting integrator integration that constant amplitude direct current high level pulse signal is formed via operational amplifier IC3 reaches the Schmidt's input nand gate IC2 that makes integration compare trigger element 103 outputs behind the threshold values of setting to be triggered, and output negative pulse triggering signal needs the triggering of positive pulse triggering signal can insert inverter to driving operating part if drive operating part; Adjust the threshold values that potentiometer W2 can adjust setting, can trigger startup with the stand by tone signal of guaranteeing telephone call office, though can be by band pass filter but the burst length width of the direct current high level pulse signal that the burst length width of the direct current high level pulse signal that noise signal is exported after the rectification shaping is produced less than the stand by tone signal and other clutter has, so the direct current high level pulse signal of noise signal output can not reach the threshold values of setting behind the noninverting integrator integration, can not make relatively Schmidt's input nand gate IC2 triggering of trigger element 103 outputs of integration, thereby got rid of the interference of other noise signal, therefore this device has stronger antijamming capability, generally has only the stand by tone signal of telephone call office could trigger startup; In the embodiment of Fig. 7, establish the stand by tone signal frequency Fo=450Hz that telephone call office transmits on telephone line, obtain R=R1=R2=R3=50K by Fo=1/2 π C √ 1/R3 (1/R1+1/R2), C=C1=C2=0.01 μ; If the output end vo=2tVi/RC of noninverting integrator, t are the time width of the stand by tone signal of telephone call office, establish t=0.4s, Vo=Vi, R=R7=R8=8K then, C=C4=100P, R4=R5=R9=R10=20K in addition, W1=W2=20K, R6=800 Ω, C3=10 μ; The model of IC1, IC3 is LM324 in the embodiment of Fig. 7, also can use single supply general-purpose operation amplifiers such as MAX473/474, MAX492/495, LM7131, TL091/092/094, TL321/322, F124, SF324, F358,8FC7, the model of IC2 is 74LS132, also can be with 7414, Schmidt's input nand gate such as 47LS19.

Dial-up user of the present utility model detect electric installation another kind of embodiment circuit diagram as shown in Figure 8: comprise bandpass filtering unit 201, rectification unit 202, count pulse generating unit 203, counting relatively trigger element 204 the input part and drive operating part 205; The active second-order bandpass filter circuit of unlimited gain multichannel negative feedback that bandpass filtering unit 201 is formed for operational amplifier IC1, rectification unit 202 comprises rectifier diode D1 and π type RC detecting circuit, count pulse generating unit 203 is the astable oscillator of being made up of 555 time-base integrated circuit IC2, counting relatively trigger element 204 comprises by two 42 advancing the counter that asynchronous counter IC3 and single 8 input nand gate IC4 form and being used for shaping and anti-phase Schmidt's input nand gate IC5, and driving operating part 205 comprises monostable flipflop and the relay J of being made up of 555 time-base integrated circuit IC6; The input Vi of bandpass filtering unit 201 is connected in parallel on the telephone line, the output of bandpass filtering unit 201 is the rectifier diode D1 that the output of operational amplifier IC1 connects rectification unit 202, rectifier diode D1 connects π type RC detecting circuit, π type RC detecting circuit connects the potentiometer W1 of rectification unit 202 outputs, the potentiometer output connection count of rectification unit 202 is the 1A of the Schmidt trigger of trigger element 204 inputs relatively, the 1Y of the Schmidt trigger of input connects two 42 and advances asynchronous counter IC3 zero clearing input RD, the output pin 3 of 555 time-base integrated circuit IC2 of count pulse generating unit 203 connects two 42 and advances asynchronous counter IC3 input end of clock 1CP, two 42 1QD that advance asynchronous counter IC3 connect 2CP, two 42 output 2QA that advance asynchronous counter IC3,2QB, 2QC, 2QD, 1QA, 1QB, 1QC, 1QD connects the input A of single 8 input nand gate IC4 respectively, B, C, D, E, F, G, H, the output Y of single 8 input nand gate IC4 connects the input capacitance C7 that drives the monostable flipflop of being made up of 555 time-base integrated circuit IC6 in the operating part 205, the output pin 3 that drives 555 time-base integrated circuit IC6 in the operating part 205 connects relay J, the other end ground connection of relay J, diode D2 is connected in parallel on two ends of relay J, the telephone line that the input Vi of the end connecting band pass filter unit 201 of the normally closed switch J1 of relay J is connected, the other end connects the modulation-demodulation device that links to each other with computer.

In the embodiment of the utility model Fig. 8, the second order voltage controlled voltage source band pass filter circuit of bandpass filtering unit 201 can only allow the frequency be that the audio signal of Fo=1/2 π C √ 1/R3 (1/R1+1/R2) (C=C1=C2 in the formula) is passed through, the audio signal of the band pass filter circuit by bandpass filtering unit 201 is through the rectifier diode D1 and the π shape RC detecting circuit output direct current high level signal of rectification unit 102, the direct current high level signal is through the dc pulse signal of Schmidt's input nand gate IC2 shaping output constant amplitude, adjusting potentiometer W1 can make the stand by tone signal be constant amplitude high level pulse signal after the rectification shaping, if the time width of the stand by tone signal of telephone call office is T1, period T 2=07 (R5+2R6) C5 of the counting pulse signal of the 555 time-base integrated circuit IC2 output of count pulse generating unit 203, advancing asynchronous counter IC3 by two 42 overflows when counting surpasses 256 (2 4+4 powers) time with the counter that single 8 input nand gate IC4 form, select the R5 of count pulse generating unit 203, R6, C5 makes 256T2＜T1; After user's online, when people's incoming call is arranged, then telephone call office's transmission frequency on telephone line is the stand by tone signal of Fo, because the time width T1＞256T2 of stand by tone signal, so counter can overflow, the triggering signal of the output Y output low level of promptly single 8 input nand gate IC4, import the pin 2 of 555 time-base integrated circuit IC6 through input capacitance C7, trigger the monostable flipflop that drives in the operating part 205, make the drive signal of the pin 3 output high level of 555 time-base integrated circuit IC6, make the relay J adhesive, normally closed switch J1 is disconnected; Though and other clutter has can be by band pass filter but the burst length width of the pulse triggering signal that noise signal produces at the 1Y of the Schmidt trigger of input after the rectification shaping less than 256T2, so counter can not overflow, thereby got rid of the interference of other noise signal, guaranteed to have only the stand by tone signal of telephone call office could trigger startup; In the embodiment of Fig. 8, establish the stand by tone signal frequency Fo=450Hz that telephone call office transmits on telephone line, obtain R=R1=R2=R3=50K by Fo=1/2 π C √ 1/R3 (1/R1+1/R2), C=C1=C2=0.01 μ; If the time width T1=0.4s of the stand by tone signal of telephone call office obtains T2＜0.0015625s by T1＞256T2, obtain R5=300 Ω by T2=0.7 (R5+2R6) C5, R6=10K, C5=0.1 μ, in addition, C3=C4=10 μ, R4=1K, W1=20K.

The model of IC1 is LM324 in the embodiment of Fig. 8, also can use MAX473/474, MAX492/495, LM7131, TL091/092/094, TL321/322, F124, SF324, F358, single supply general-purpose operation amplifiers such as 8FC7, IC2, the model of IC6IC6 is NE555, also can be with other 555 time-base integrated circuit, the model of IC3 is 74LS393, the model of IC4 is 74LS30, IC3, IC4 also can be with the identical counter of other digital integrated circuit composition function, the model of IC5 is 74LS132, also can be with 7414, Schmidt's input nand gates such as 47LS19, the model of relay J is JRC-14M, also can use JRX-13F series; In the embodiment of Fig. 8, drive in the operating part 205 and form monostable flipflop, in other embodiment of the present utility model, also can be 74121, the digital integrated circuit of CT74221, monostable flipflops such as 4047 with model by 555 time-base integrated circuit IC6; In the embodiment of Fig. 8, the bandpass filtering unit is the active band-pass filter circuit that operational amplifier is formed, and the passive bandwidth-limited circuit that RC, LC etc. form also can be used in the bandpass filtering unit in other embodiment of the present utility model; In the embodiment of Fig. 8, performance element is a relay J in the driving operating part 205, and performance element also can be used electronic switches such as solid state relay SSR, bidirectional thyristor, bidirectional analog switch integrated circuit in other embodiment of the present utility model; Perhaps directly notify the user with ring.

The power supply that the dial-up user detects the device of incoming call in the utility model can be used dry cell, rechargeable battery, the also DC power supply that can after rectification, detection, voltage stabilizing, obtain with the AC and DC signal of telecommunication in the telephone line, the perhaps DC power supply that obtains after rectification, detection, voltage stabilizing of 220V civil power is arranged in the computer (device is inserted on the mainboard of computer as computer card) then can computed DC power supply if the dial-up user detects the device of incoming call.

At the various bandwidth-limited circuits described in the embodiment of the present utility model, the rectification circuit, the non-steady-state oscillation circuit of pulsing, the count comparator circuit, schmidt shaping circuit and single-shot trigger circuit etc. all are prior aries, and the circuit of described function is too numerous to mention in the prior art, of the present utility model being characterised in that made up these circuit of the prior art, the function that the utility model that generation makes new advances is required, promptly in time detect the stand by tone signal in the telephone signal, and after detecting incoming call, directly ring or the modulation-demodulation device that dials up on the telephone with interruption indirectly make the mode of ringing telephone stations notify the user, thereby have solved when the user surfs the Net the problem that others can't incoming call connection.So reaching under the situation of identical function, except that the utility model listed examples, can also make up with non-steady-state oscillation circuit, count comparator circuit, schmidt shaping circuit and the single-shot trigger circuit of other various bandwidth-limited circuits, rectification circuit, pulsing, detect incoming call and notify the user, this specification has been enumerated no longer one by one.

Claims

1. a dial-up user detects the device of incoming call, comprise power unit, driving operating part (3) and the bandwidth-limited circuit formed by driver element and performance element, the rectification circuit, pierce circuit, counter circuit, integrator circuit, Schmitt trigger circuit, monostable flipflop circuit etc., it is characterized in that: various circuit are formed the input part (2) that can detect the stand by tone signal and export triggering signal, and the output of input part (2) connects the input that drives operating part (3): described input part (2) comprises can be by the bandpass filtering unit (8) of stand by tone signal, can carry out rectification and export the rectification unit (9) of direct current signal waiting for tone signal, can detect the dc pulse signal of stand by tone signal time width and the comparison trigger element (10) of timely output triggering signal; Wherein, the input of bandpass filtering unit (8) is connected in parallel on the telephone line, the output of bandpass filtering unit (8) connects the input of rectification unit (9), the output of rectification unit (9) connects the relatively input of trigger element (10), and relatively the output of trigger element (10) connects the input that drives operating part (3).

2. dial-up user according to claim 1 detects the device of incoming call, it is characterized in that: the dc pulse signal that described relatively trigger element is a stand by tone signal time width reaches the integration that behind the threshold values of setting trigger is triggered and compares trigger element (103) through the integrator integration.

3. dial-up user according to claim 1 detects the device of incoming call, it is characterized in that: described relatively trigger element is that the counter of setting the input counting pulse signal overflows in stand by tone signal time width and the counting that triggers trigger element (204) relatively.

4. detect the device of incoming call according to claim 1 or 2 or 3 described dial-up users, it is characterized in that: described performance element is ring or voice suggestion integrated circuit.

5. detect the device of incoming call according to claim 1 or 2 or 3 described dial-up users, it is characterized in that: described performance element is to be used for the relay of the modulation-demodulation device telephone wire that interrupts dialling up on the telephone.

6. detect the device of incoming call according to claim 1 or 2 or 3 described dial-up users, it is characterized in that: described performance element is to be used for the electronic switch of the modulation-demodulation device telephone wire that interrupts dialling up on the telephone.