KR910000382Y1 - Telephone circuit for preventing unauthorized calls - Google Patents

Telephone circuit for preventing unauthorized calls Download PDF

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Publication number
KR910000382Y1
KR910000382Y1 KR2019860018567U KR860018567U KR910000382Y1 KR 910000382 Y1 KR910000382 Y1 KR 910000382Y1 KR 2019860018567 U KR2019860018567 U KR 2019860018567U KR 860018567 U KR860018567 U KR 860018567U KR 910000382 Y1 KR910000382 Y1 KR 910000382Y1
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KR
South Korea
Prior art keywords
transistor
terminal
grounded
resistor
circuit
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KR2019860018567U
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Korean (ko)
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KR880010908U (en
Inventor
유재석
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대우전자 주식회사
김용원
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Priority to KR2019860018567U priority Critical patent/KR910000382Y1/en
Publication of KR880010908U publication Critical patent/KR880010908U/en
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Publication of KR910000382Y1 publication Critical patent/KR910000382Y1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/667—Preventing unauthorised calls from a telephone set
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2201/00—Electronic components, circuits, software, systems or apparatus used in telephone systems
    • H04M2201/04—Transistors

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

내용 없음.No content.

Description

무선전화기 도용방지 회로Cordless phone theft prevention circuit

제1도는 본 고안의 회로도이다.1 is a circuit diagram of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

D2: 역전압 방지 다이오드 LD1: 충전상태로 표시기(Charge Indicator)D 2 : Reverse voltage prevention diode LD 1 : Charge indicator

R7: LD1보호저항 RL-1 : 릴레이R 7 : LD 1 protection resistor RL-1: Relay

본 고안은 일반 무선전화기에 있어서, 통화를 하지 않는 상태일 때, 도용방지를 위한 무선전화기 도용방지 회로에 관한 것이다.The present invention relates to a radiotelephone theft prevention circuit for preventing theft when a call is not in a normal radiotelephone.

일반적으로 무선전화기를 아파트 등과 같은 밀집 주거지역에서 사용할 경우, 무선전화기간의 사용 주파수가 별반 차이가 없으므로 통화를 하지 않을 때 이웃 가구의 무선전화기를 도용할 수도 있었고, 또한 이웃가구가 자신의 무선전화를 도용할 수 있음으로 인해 오는 상호간의 불이익을 막는데 본 고안의 목적이 있다.In general, when a cordless phone is used in a dense residential area such as an apartment, there is no difference in the frequency of use of the radiotelephone, so that a neighbor's household could use a cordless phone when not making a call. The purpose of the present invention is to prevent the mutual disadvantages coming from being able to steal.

통상적으로 일반 무선전화기는 제1도의(가)부분과 같이 구성되어 있어, 통화를 하지 않는 상태 즉 고정장치에 이동장치가 결합되어 있는 상태일때도 톤 데코더(IC2)가 FMIF(IC1)에서 나오는 5.3KHz의 파이롯트(Pilot)신호를 받아 톤 데코더가 자체 발진하고 있는 5.3KHz의 주파수와 일치하게 되면 톤 데코더(IC2)의 출력 전압이 로우(low)가 되어 트랜지스터(Q2)를 도통시켜 릴레이(RL-1)를 동작시키게 되어 있어서, 쉽게 전화를 도용할 수 있다.In general, a general cordless telephone is configured as shown in FIG. 1, so that the tone decoder (IC 2 ) is connected to the FMIF (IC 1 ) even when there is no call, that is, when the mobile device is coupled to the fixed device. When the output of the tone decoder IC 2 becomes low when the received tone signal of 5.3KHz is matched with the frequency of 5.3KHz which the oscillator itself oscillates, the transistor Q 2 is turned on. The relay RL-1 is operated so that the phone can be stolen easily.

본 고안은 상기와 같은 점을 감안하여 고정장치에 이동장치를 올려 놓고 사용하지 않을 때(충전시)에는 FMIF(IC1)에서 5.3KHz의 파이롯트 신호가 나와도, 이 신호가 톤 데코더로 전가되지 못하게 하므로서, 전체적인 회로가 동작을 못하여 도용을 방지할 수 있도록 한 것으로서, 이하 첨부도면에 의하여 상세히 설명하면 다음과 같다.In consideration of the above, the present invention prevents the signal from being transferred to the tone decoder even when a pilot signal of 5.3 KHz is output from the FMIF (IC 1 ) when it is not in use (when charging). Therefore, as a whole circuit to prevent theft by failing to operate, it will be described in detail by the accompanying drawings as follows.

FMIF(IC1)의 출력단자는 톤 데코더(Tone Dicoder, IC2)의 입력단자와 연결되고, 톤 데코더의 각 단자는 콘덴서(C1,C2,C3,C4) 저항(R1,R2,R3,R4)과 트랜지스터(Q2)와 연결되고, 상기 트랜지스터(Q2)의 콜렉터는 릴레이(RL-1)와 다이오드(D1)가 병렬로 접속되어 있는 기존의 무선전화기회로에 있어서, 톤 데코더(IC2)의 입력단자에 트랜지스터(Q1)의 콜렉터를 연결하고, 에미터는 접지시켰으며, 베이스는 저항(R5,R7)과 발광다이오드(LD1)를 거쳐 접지되었고, 저항(R5)의 한 끝에는 접지된 콘덴서(C5)를 두고, 다른 한끝은 접지저항(R6) 충전단자(G)의 (-)단자와 연결시켰으며 충전단자(G)의 (+)단자는 B+전원과 연결하였다.The output terminal of FMIF (IC 1 ) is connected to the input terminal of tone decoder (IC 2 ), and each terminal of the tone decoder is capacitor (C 1 , C 2 , C 3 , C 4 ) resistor (R 1 , R 2 , R 3 , R 4 ) and a transistor Q 2 , and the collector of the transistor Q 2 is a conventional radiotelephone circuit in which a relay RL-1 and a diode D 1 are connected in parallel. In this case, the collector of transistor Q 1 is connected to the input terminal of tone decoder IC 2 , the emitter is grounded, and the base is grounded via resistors R 5 and R 7 and light emitting diode LD 1 . One end of resistor (R 5 ) has a grounded capacitor (C 5 ), and the other end is connected to the negative terminal of grounding resistor (R 6 ) charging terminal (G). +) Terminal is connected to B + power.

이와 같이 구성된 본 고안에서는 이동장치(T)가 고정장치(F)위에 놓여 있는 비통화 상태일때(충전시)는 이동장치(T)의 (+)(-)단자와 충전밧데리 그리고 다이오드(D2), (-)단자를 통하여 저항(R5)를 통해 트랜지스터(Q1)의 베이스에 가해지므로서 트랜지스터(Q1)의 에미터와 콜렉터간이 도통하게 되어 아무리 FMIF(IC1)에서 5.3KHz의 파이롯트 신호가 나와도, 이 신호는 톤 데코드로 인가되지 못하고, 트랜지스터(Q1)을 통해 그라운드 되어 버리므로 톤 데코더가 작동하지 않아 릴레이(RL-1)가 동작을 하지 못하므로 절대 도용을 할수 없다.In the present invention configured as described above, when the mobile device T is in a non-call state (at the time of charging), which is placed on the fixing device F, the (+) (-) terminal of the mobile device T, the charging battery and the diode D 2 Is applied to the base of transistor Q 1 through resistor R 5 through terminal (-) and (-), so that the emitter and collector of transistor Q 1 become conductive so no matter how much is 5.3KHz at FMIF (IC 1 ) Even when the pilot signal is output, the signal is not applied to the tone decode and is grounded through the transistor Q 1 , so the tone decoder does not operate and the relay RL-1 does not operate so that the signal cannot be stolen.

한편 상기와 같이 비통화 상태일때(충전시)회선을 타고오는 링 신호는 정상적으로 처리가 되는데 그 이유는 본 고안에서는 고정장치의 수신회로만 제어하므로 회선을 타고오르는 링 신호는 고정장치의 송신회로를 통하여 이동장치로 전달되어 정상적인 동작을 하게 된다.On the other hand, when the non-call state (when charging) as described above, the ring signal coming from the line is processed normally. The reason is that in the present invention, only the receiving circuit of the fixing device is controlled, so the ring signal coming up the line is connected to the transmitting circuit of the fixing device. It is delivered to the mobile device through the normal operation.

한편 이동장치(T)를 들고 통화를 할 경우에는 B+전원이 트랜지스터(Q1)의 베이스에 인가되지 못하여 트랜지스터(Q1)의 베이스가 영 전위가 되므로 트랜지스터(Q1)은 통작하지 않는다.On the other hand, when making a call with the mobile device T, B + power is not applied to the base of the transistor Q 1 , and the base of the transistor Q 1 becomes a zero potential, so that the transistor Q 1 does not operate.

따라서 회로는 정상적으로 동작을 해 통화를 할 수 있게 된다.Therefore, the circuit can operate normally and make a call.

상기와 같이 본 고안은 이동장치(T)가 고정장치(F)상에 놓여있는 통화중이 아닌 상태에서 트랜지스터(Q1)가 동작하여 톤데코더(IC2)로 들어가는 입력을 차단하므로서, 무선 전화기의 도용을 막을 수 있다는 장점이 있다.As described above, the present invention operates the transistor Q 1 in a state where the mobile device T is not in a call on the fixed device F, thereby blocking the input to the tone decoder IC 2 , thereby making the wireless telephone The advantage is that it can prevent theft.

Claims (1)

공지의 무선전화기 회로(a)에 있어서, 톤 데코더(IC2)의 입력단자에 트랜지스터(Q1)의 콜렉터를 연결하고, 에미터는 접지시켰으며, 베이스는 저항(R5,R7)과 발광다이오드(LD1)를 거쳐 접지되었고, 저항(R5)의 한 끝에는 접지된 콘덴서(C5)를 접지하고, 상기 저항(R5)의 다른 끝은 접지저항(R6)과 충전단자(G)의 (-)단자와 연결하였으며 충전단자(G)의 (+)측은 B+전원과 연결하여서 된, 무선전화기용 도용방지회로.In the known radiotelephone circuit (a), the collector of transistor Q 1 is connected to the input terminal of tone decoder IC 2 , the emitter is grounded, and the base is resistors R 5 , R 7 and light emission. Grounded via diode LD 1 , one end of resistor R 5 is grounded capacitor C 5 , and the other end of resistor R 5 is grounded resistor R 6 and charging terminal G. Anti-theft circuit for wireless telephone, which is connected with (-) terminal of) and (+) side of charging terminal (G) is connected with B + power.
KR2019860018567U 1986-11-27 1986-11-27 Telephone circuit for preventing unauthorized calls KR910000382Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019860018567U KR910000382Y1 (en) 1986-11-27 1986-11-27 Telephone circuit for preventing unauthorized calls

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019860018567U KR910000382Y1 (en) 1986-11-27 1986-11-27 Telephone circuit for preventing unauthorized calls

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KR880010908U KR880010908U (en) 1988-07-28
KR910000382Y1 true KR910000382Y1 (en) 1991-01-18

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KR2019860018567U KR910000382Y1 (en) 1986-11-27 1986-11-27 Telephone circuit for preventing unauthorized calls

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