JPS561632A - Transmission/reception signal isolating circuit - Google Patents

Transmission/reception signal isolating circuit

Info

Publication number
JPS561632A
JPS561632A JP7706979A JP7706979A JPS561632A JP S561632 A JPS561632 A JP S561632A JP 7706979 A JP7706979 A JP 7706979A JP 7706979 A JP7706979 A JP 7706979A JP S561632 A JPS561632 A JP S561632A
Authority
JP
Japan
Prior art keywords
transmission
signal
reception
signals
transformer
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.)
Pending
Application number
JP7706979A
Other languages
Japanese (ja)
Inventor
Hitoshi Ito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP7706979A priority Critical patent/JPS561632A/en
Publication of JPS561632A publication Critical patent/JPS561632A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To ensure the steady isolation between the transmission and reception signals, by picking up each transmission signal by the 1st transformer and then the mixture signal of the transmission and reception signals by the 2nd transformer each to obtain the difference between both signals and then extracting the reception signal only. CONSTITUTION:The transmission signal sent from transmitter microphone T is supplied to the base of transistor TR2 via coils t1 and t2 of transformer T1. Transformer T2 picks up the mixture signal of the transmission signal emerging at the emitter of TRTR2 and the reception signal passing through resistor r3. Coil t3 of T1 picks up the transmission signal. The signals picked up by t3 and T2 are amplified to A1 and A2 each and then the level control is received by variable resistors VR1 and VR2 along with the substraction given at subtractor circuit MX. Then the sufficient attenuation is given to the transmission signal, and only the reception signals are nearly extracted out of T3. As a result, the steady isolation is always possible for the reception and transmission signals although the characteristic impedance of the line may vary.
JP7706979A 1979-06-19 1979-06-19 Transmission/reception signal isolating circuit Pending JPS561632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7706979A JPS561632A (en) 1979-06-19 1979-06-19 Transmission/reception signal isolating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7706979A JPS561632A (en) 1979-06-19 1979-06-19 Transmission/reception signal isolating circuit

Publications (1)

Publication Number Publication Date
JPS561632A true JPS561632A (en) 1981-01-09

Family

ID=13623500

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7706979A Pending JPS561632A (en) 1979-06-19 1979-06-19 Transmission/reception signal isolating circuit

Country Status (1)

Country Link
JP (1) JPS561632A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993001597A1 (en) * 1991-07-04 1993-01-21 Brian Kenneth Grant Allan Telephone recording device
AU656618B2 (en) * 1991-07-04 1995-02-09 David Frew Bonnin Telephone recording device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993001597A1 (en) * 1991-07-04 1993-01-21 Brian Kenneth Grant Allan Telephone recording device
AU656618B2 (en) * 1991-07-04 1995-02-09 David Frew Bonnin Telephone recording device

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