JPS5493947A - Resistance hybrid circuit - Google Patents
Resistance hybrid circuitInfo
- 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
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
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) |
-
1978
- 1978-01-06 JP JP23978A patent/JPS5493947A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6138657B2 (en) | 1986-08-30 |
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