JPS5493947A - Resistance hybrid circuit - Google Patents

Resistance hybrid circuit

Info

Publication number
JPS5493947A
JPS5493947A JP23978A JP23978A JPS5493947A JP S5493947 A JPS5493947 A JP S5493947A JP 23978 A JP23978 A JP 23978A JP 23978 A JP23978 A JP 23978A JP S5493947 A JPS5493947 A JP S5493947A
Authority
JP
Japan
Prior art keywords
wire
expression
impedance
input
hybrid 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.)
Granted
Application number
JP23978A
Other languages
Japanese (ja)
Other versions
JPS6138657B2 (en
Inventor
Kozo Kamata
Yoshinori Nagoya
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP23978A priority Critical patent/JPS5493947A/en
Publication of JPS5493947A publication Critical patent/JPS5493947A/en
Publication of JPS6138657B2 publication Critical patent/JPS6138657B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Networks Using Active Elements (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE: To restrain the transmission power of a voice amplifier as small as possible by reducing the transmission loss in the four wire two wire direction in a four- wire local telephone exchange.
CONSTITUTION: When the characteristic impedance of a two-wire line, the characteristic impedance of balancing connection network 6, the output impedance of operational amplifier 11, the input impedance of operational amplifier 12, and values of resistances 9 and 10 are denoted as Z01, Z02, R0, infinitive, R1, and R2 respectively, values of R1 and R2 are selected to satisfy expression (1), and in this case, conditions where the impedance of a resistance hybrid circuit at the view from the two-wire line side is equal to Z01 are as shown in expression (2). Next, when R1 is cancelled from expressions (1) and (2), expression (3) is obtained, and R2 is obtained as shwon in expression (4) on a basis of expression (3). At this time, the echoattenuation from the four-wire input to the four-wire output can be made sufficiently large practically, and most of the power of the four-wire input is transmitted to the two-wire side.
COPYRIGHT: (C)1979,JPO&Japio
JP23978A 1978-01-06 1978-01-06 Resistance hybrid circuit Granted JPS5493947A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23978A JPS5493947A (en) 1978-01-06 1978-01-06 Resistance hybrid circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23978A JPS5493947A (en) 1978-01-06 1978-01-06 Resistance hybrid circuit

Publications (2)

Publication Number Publication Date
JPS5493947A true JPS5493947A (en) 1979-07-25
JPS6138657B2 JPS6138657B2 (en) 1986-08-30

Family

ID=11468409

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23978A Granted JPS5493947A (en) 1978-01-06 1978-01-06 Resistance hybrid circuit

Country Status (1)

Country Link
JP (1) JPS5493947A (en)

Also Published As

Publication number Publication date
JPS6138657B2 (en) 1986-08-30

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