CN2228695Y - 16 restrainer double acoustic frequency telephone - Google Patents
16 restrainer double acoustic frequency telephone Download PDFInfo
- Publication number
- CN2228695Y CN2228695Y CN95200453U CN95200453U CN2228695Y CN 2228695 Y CN2228695 Y CN 2228695Y CN 95200453 U CN95200453 U CN 95200453U CN 95200453 U CN95200453 U CN 95200453U CN 2228695 Y CN2228695 Y CN 2228695Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- phone
- electric capacity
- limiters
- integrated circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a telephone limiting unit, which particularly overcomes the problem of overburdensome cost burden of work phones. The telephone limiting unit comprises a power supply, a reset circuit, a double acoustic frequency receiving circuit connected with the reset circuit, a decoding circuit, a shift circuit, a latching and controlling circuit of which the input end is connected with the decoding circuit and the shift circuit, wherein, the input ends of the decoding circuit and the shift circuit are connected with the double acoustic frequency receiving circuit. The telephone limiting unit is mainly used for carrying out AC short circuit for a dialogue machine after a user dials 16 firstly for achieving a limiting purpose further. The utility model can not affect the normal use of a telephone.
Description
The utility model relates to a kind of phone limiter.
The present telephone communication of China open-minded along with information station such as 160,168, for people obtain various information and amusement provides convenience, but because of telephone charges is very high, the thing followed is that the telephone charges of factories and miness, enterprise and office rolls up, and has increased the weight of business burden.
Goal of the invention of the present utility model is to design a kind of can the controller that limit after the first appearance 16 of phone being can be used to the part phone of factories and miness, enterprise is limited, to save the spending that telephone charges is used.
Technical solution of the present utility model is: dual tone phone 16 limiters, it has the double-tone frequency receiving circuit that input is connected with outside line, the output of this circuit is connected to decoding circuit and shift circuit, the output of decoding circuit is connected with latching with control circuit, the output of latching with control circuit is connected to phone, and power supply is responsible for providing power supply and reset signal to whole system with reset circuit.
Below in conjunction with accompanying drawing enforcement of the present utility model is described in detail.
Fig. 1 is a circuit block diagram of the present utility model, and as Figure of abstract.
Fig. 2 is an electrical schematic diagram.
As shown in Figure 1, the utlity model has power supply and reset circuit, double-tone receiving circuit, shift circuit, decoding circuit and latch and control circuit frequently.
As shown in Figure 2, power supply of the present utility model and reset circuit are by voltage-stabiliser tube CW, capacitor C
1, C
2, resistance R
1With diode D
1Form.The forward of this circuit (being voltage-stabiliser tube and the positive pole of electric capacity) and outside line (IN)+be connected, simultaneously for this system provides+the 5V power supply, negative sense is connected with an end of phone (OUT), provides ground wire for native system simultaneously.C
2With R
1The junction be reset terminal (RESET), it and U
2(9) end and U
5(10) end, (4) end connect, when user's off-hook, the voltage of CW two ends jumps to 5V from 0V, C
1Charge to 5V simultaneously, CW and C
1For whole system provides+the 5V power supply, energising is after C
2Produce a differential signal at reset terminal (RESET), make U
2And U
5Reset to initial condition.
As shown in Figure 2, double-tone frequency receiving circuit of the present utility model is by integrated circuit U
1, resistance R
2, R
3, R
4, capacitor C
3, C
4Form integrated circuit U with crystal oscillator Z
1Adopt MT8870, crystal oscillator Z is 3.579MHZ, and the input of this circuit (2), (3) are through R
2, R
3And C
3With outside line (IN)-be connected with an end of phone (OUT), output terminals A, B, C, D are connected U with input A, B, C, the D of decoding circuit
1(15) and (10) end with shift circuit U
2(10) end connect, behind user's off-hook, crystal oscillator Z vibrates immediately, the double-tone of pressing phone as the user is frequently during button, U
1Bring out existing high level in (15), the edge is as U thereafter
2Shift pulse, simultaneously bring out now corresponding binary-coded decimal at A, B, C, D.
As shown in Figure 2, shift circuit of the present utility model adopts integrated circuit U
2, U
2Be by CD4021 (8 setable shift registers) that its P1, P2, P3, P4, P6, P7, P8 put 0, P5 puts 1, and Q6, Q7 are connected to U respectively
4(1), (4) end, behind user's off-hook, reset signal P/S shifts forward P5, after the user dials the first number, by CLK pulse Q6 output 1, can detect the 1st number, dial the 2nd number after, shift circuit shifts forward, Q6 is 0, and Q7 is 1, and the 2nd number detected.
As shown in Figure 2, decoding circuit of the present utility model is by integrated circuit U
3And capacitor C
5, C
6Form integrated circuit U
3Adopt CD4028 (4-10 decoder), it receives U in A, B, C, D termination
1The binary-coded decimal of sending here, and, bring out existing high level at corresponding Q with after its decoding, have only Q1 and Q6 output here, form detection to " 16 ", output Q1, the Q6 of decoding circuit insert U respectively
4(2), (5) end.
As shown in Figure 2, of the present utility model latch with control circuit by integrated circuit U
4(74HC08-42 and door), U
5(CD4013-double D trigger), resistance R
5, R
6, triode G, relay KR, relay normally opened contact J, diode D
2And capacitor C
7Form, relay KR adopts 4100 (6V), the normally opened contact J and the capacitor C of relay KR
7Be connected between phone (OUT) two wires, during subscriber dialing, as U
4(1) end for " 1 ", (2) end also is " 1 ", represents that the 1st item sign indicating number dials " 1 ", at U
4(3) end output positive transition, trigger U
5(13) end become high level.During the input of the 2nd item sign indicating number, U
4(4) end be 1, represent that the 2nd item sign indicating number is " 6 " if (5) end also be " 1 ", U
4(6) bring out existing high level, trigger U
5(3) end, make (1) end become high level.When figure place and number have one not right, output low level then.U
5(1) end, (13) end all be high level, represent that the user dials " 16 ", at U
4(12), (13) end with, (11) are held and are become " 1 " from " 0 ", through resistance R
5Make triode G conducting, the relay KR adhesive makes between the substation two wires ac short circuit to occur, reaches the purpose of restriction " 16 ".
Claims (6)
1. dual tone phone 16 limiters, it is characterized in that: power supply and reset circuit and outside line (IN)+, one end of phone (OUT), double-tone is receiving circuit frequently, shift circuit, decoding circuit is connected with latching with control circuit, double-tone input and the outside line (IN) of receiving circuit frequently-be connected with the other end of phone (OUT), output is connected with the input of shift circuit and decoding circuit, the output of decoding circuit and shift circuit is connected with latching with control circuit, latch with the output of control circuit and be connected with phone (OUT)
2. according to described dual tone phone 16 limiters of claim 1, it is characterized in that: power supply comprises with reset circuit: voltage-stabiliser tube (CW), electric capacity (C
1), (C
2), resistance (R
1) and diode (D
1), its forward (positive pole of voltage-stabiliser tube and electric capacity) and outside line (IN)+be connected, and provide+the 5V power supply for entire circuit, its negative sense is connected with an end of phone (OUT), and for entire circuit provides ground wire, its reset terminal (RESET) is connected with (9) end of (U2) and (10), (4) end of (U5).
3. according to described dual tone phone 16 limiters of claim 1, it is characterized in that: double-tone frequency receiving circuit is by integrated circuit (U
1), resistance (R
2), (R
3), (R
4), electric capacity (C
3), (C
4) and crystal oscillator (Z) composition, integrated circuit (U
1) adopting MT8870, its input (2), (3) are through resistance (R
2), (R
3) and electric capacity (C
3) with outside line (IN)-be connected integrated circuit (U with an end of phone (OUT)
1) (15), (10) end and (U
2) (10) end connect, (A), (B), (C), (D) end respectively with (U
3) (A), (B), (C), (D) hold connection.
4. according to claim 1 or 2 described dual tone phone 16 limiters, it is characterized in that: shift circuit (U
2) adopt CD4021, its (1), (15), (14), (4), (5), (6), (7), (11), (8) end ground connection, (13), (16) termination+5V, output (2), (12) end are connected with (1), (4) end of (U4) respectively.
5. according to claim 1 or 3 described dual tone phone 16 limiters, it is characterized in that: decoding circuit is by integrated circuit (U
3) and electric capacity (C
5), (C
6) form integrated circuit (U
3) adopt CD4028, its output (14), (7) end respectively with (U
4) (2), (5) end connect.
6. according to claim 1,4,5 described dual tone phone 16 limiters, it is characterized in that: latch with control circuit by integrated circuit (U
4), (U
5), resistance (R
5), (R
6), triode (G), relay (KR), diode (D
2) and electric capacity (C
7) form integrated circuit (U
4) employing 74HC08, (U
5) adopting CD4013, relay (KR) adopts 4100, contact of relay (J) and electric capacity (C
7) be connected between the phone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95200453U CN2228695Y (en) | 1995-01-06 | 1995-01-06 | 16 restrainer double acoustic frequency telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95200453U CN2228695Y (en) | 1995-01-06 | 1995-01-06 | 16 restrainer double acoustic frequency telephone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2228695Y true CN2228695Y (en) | 1996-06-05 |
Family
ID=33854189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95200453U Expired - Fee Related CN2228695Y (en) | 1995-01-06 | 1995-01-06 | 16 restrainer double acoustic frequency telephone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2228695Y (en) |
-
1995
- 1995-01-06 CN CN95200453U patent/CN2228695Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |