GB1115216A - Hybrid transformer - Google Patents
Hybrid transformerInfo
- Publication number
- GB1115216A GB1115216A GB936067A GB936067A GB1115216A GB 1115216 A GB1115216 A GB 1115216A GB 936067 A GB936067 A GB 936067A GB 936067 A GB936067 A GB 936067A GB 1115216 A GB1115216 A GB 1115216A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filter
- signals
- line
- signal
- output
- 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
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
- H04B1/581—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 using a transformer
- H04B1/582—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 using a transformer with automatic balancing
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Networks Using Active Elements (AREA)
Abstract
1,115,216. Hybrid transformer circuits. STANDARD TELEPHONES & CABLES Ltd. 28 Feb., 1967, No. 9360/67. Heading H4R. The balancing network of a two-to-four wire hybrid transformer circuit is automatically adjusted in accordance with error signals which are derived from signals in a narrow frequency band extracted from the send pair and the receiving pair. Fig. 2 shows one embodiment in which the balancing network for the hybrid circuit includes variable resistors R 1 and R 2 which are adjusted in accordance with error signals derived by filtering from the incoming signals on line 3 frequencies of, e.g., 800 c.p.s., by filter F1. The output of filter F1 is applied to a phase shifter 6 in order to obtain signals in quadrature which are applied to multipliers 7 and 9, to the other inputs of which are applied the signals selected from the outgoing line 4 by the filter F2, which is tuned to the same frequency as filter F1 The output of the multipliers is integrated in integrators 8 and 10 and the resulting signals adjust the values of the respective resistors R1 and R2, which may be field effect transistors, Fig. 3 (not shown). The integrator output signal are representative of the echo signal fed from the receive line to the send line via the unbalanced hybrid circuit. Signals from the subscriber's line 5 have no effect on the integrator outputs since they do not reach the input of filter F1 due to the presence of amplifier A1 while components of the subscriber's line signal which pass through filter F2 are uncorrelated with the signals from filter F1 and do not therefore produce an output from the integrators. In a modified system, Fig. 4 (not shown), the input of filter F1 is connected across the balance network since no signal from the subs line 5 reaches this point. In an alternative arrangement only one error signal is derived, and the resistors R1 and R2 are adjusted simultaneously, Fig. 5 (not shown).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB936067A GB1115216A (en) | 1967-02-28 | 1967-02-28 | Hybrid transformer |
ES351041A ES351041A1 (en) | 1967-02-28 | 1968-02-28 | Hybrid transformer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB936067A GB1115216A (en) | 1967-02-28 | 1967-02-28 | Hybrid transformer |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1115216A true GB1115216A (en) | 1968-05-29 |
Family
ID=9870441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB936067A Expired GB1115216A (en) | 1967-02-28 | 1967-02-28 | Hybrid transformer |
Country Status (2)
Country | Link |
---|---|
ES (1) | ES351041A1 (en) |
GB (1) | GB1115216A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2818432A1 (en) * | 1978-04-27 | 1979-11-08 | Licentia Gmbh | Hybrid circuit with active components - has current source in balancing network which is controlled by four-wire incoming voltage |
FR2426365A1 (en) * | 1978-05-19 | 1979-12-14 | Philips Nv | HYBRID CIRCUIT FOR A TWO-FOUR WIRE AUTOMATICALLY ADJUSTED LINK |
FR2438941A1 (en) * | 1978-10-10 | 1980-05-09 | Western Electric Co | ELECTRONIC HYBRID CIRCUIT |
US4278848A (en) * | 1979-08-06 | 1981-07-14 | Bell Telephone Laboratories, Incorporated | Automatically adjustable bidirectional-to-unidirectional transmission network |
FR2515903A1 (en) * | 1981-11-05 | 1983-05-06 | Telecommunications Sa | Telephonic system two to four wire matching circuit - contains echo balancing circuit having voltage controlled variable resistance and capacitance |
EP0155569A2 (en) * | 1984-03-17 | 1985-09-25 | Neumann Elektronik GmbH | Device for matching a bidirectional amplifying circuit arranged in a transmission line with the transmission line |
EP0167234A1 (en) * | 1984-05-09 | 1986-01-08 | Northern Telecom Limited | An adaptive hybrid |
DE3514983A1 (en) * | 1984-02-21 | 1986-10-30 | Plessey Overseas Ltd., Ilford, Essex | ADAPTIVE CANCEL BRIDGE |
GB2180121A (en) * | 1985-08-14 | 1987-03-18 | Gavan Edward Kelly | A portable device for use by a news reporter |
US4757530A (en) * | 1984-05-14 | 1988-07-12 | Northern Telecom Limited | Adaptive hybrid |
US4993060A (en) * | 1988-02-23 | 1991-02-12 | Kelly Gavan E | Portable device for use by a news reporter |
-
1967
- 1967-02-28 GB GB936067A patent/GB1115216A/en not_active Expired
-
1968
- 1968-02-28 ES ES351041A patent/ES351041A1/en not_active Expired
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2818432A1 (en) * | 1978-04-27 | 1979-11-08 | Licentia Gmbh | Hybrid circuit with active components - has current source in balancing network which is controlled by four-wire incoming voltage |
FR2426365A1 (en) * | 1978-05-19 | 1979-12-14 | Philips Nv | HYBRID CIRCUIT FOR A TWO-FOUR WIRE AUTOMATICALLY ADJUSTED LINK |
FR2438941A1 (en) * | 1978-10-10 | 1980-05-09 | Western Electric Co | ELECTRONIC HYBRID CIRCUIT |
US4278848A (en) * | 1979-08-06 | 1981-07-14 | Bell Telephone Laboratories, Incorporated | Automatically adjustable bidirectional-to-unidirectional transmission network |
FR2515903A1 (en) * | 1981-11-05 | 1983-05-06 | Telecommunications Sa | Telephonic system two to four wire matching circuit - contains echo balancing circuit having voltage controlled variable resistance and capacitance |
DE3514983A1 (en) * | 1984-02-21 | 1986-10-30 | Plessey Overseas Ltd., Ilford, Essex | ADAPTIVE CANCEL BRIDGE |
EP0155569A2 (en) * | 1984-03-17 | 1985-09-25 | Neumann Elektronik GmbH | Device for matching a bidirectional amplifying circuit arranged in a transmission line with the transmission line |
EP0155569A3 (en) * | 1984-03-17 | 1986-11-20 | Neumann Elektronik Gmbh | Device for matching a bidirectional amplifying circuit arranged in a transmission line with the transmission line |
EP0167234A1 (en) * | 1984-05-09 | 1986-01-08 | Northern Telecom Limited | An adaptive hybrid |
US4757530A (en) * | 1984-05-14 | 1988-07-12 | Northern Telecom Limited | Adaptive hybrid |
GB2180121A (en) * | 1985-08-14 | 1987-03-18 | Gavan Edward Kelly | A portable device for use by a news reporter |
US4993060A (en) * | 1988-02-23 | 1991-02-12 | Kelly Gavan E | Portable device for use by a news reporter |
Also Published As
Publication number | Publication date |
---|---|
ES351041A1 (en) | 1969-05-16 |
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