GB367616A - Improvements in or relating to two-path two-way telephone and like transmission systems - Google Patents
Improvements in or relating to two-path two-way telephone and like transmission systemsInfo
- Publication number
- GB367616A GB367616A GB10526/31A GB1052631A GB367616A GB 367616 A GB367616 A GB 367616A GB 10526/31 A GB10526/31 A GB 10526/31A GB 1052631 A GB1052631 A GB 1052631A GB 367616 A GB367616 A GB 367616A
- Authority
- GB
- United Kingdom
- Prior art keywords
- outgoing
- condenser
- relay
- valves
- currents
- 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
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/06—Control of transmission; Equalising by the transmitted signal
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Emergency Protection Circuit Devices (AREA)
- Interface Circuits In Exchanges (AREA)
- Amplifiers (AREA)
Abstract
367,616. Valve amplifying circuits. ELECTRICAL RESEARCH PRODUCTS, Inc., 195, Broadway, New York, U.S.A.- (Assignees of Hogg, J. L. ; 18, Webster Place, East Orange, New Jersey, and Doba, S. ; 2038, East 24th Street, Brooklyn, New York, both in U.S.A.) April 9, 1931, No. 10526. Convention date, April 19, 1930. [Class 40 (v).] A two-way amplifier is adapted to diminish the gain of outgoing signals and to increase that of incoming signals when the outgoing amplitude exceeds an upper limit, and to reverse these effects when the outgoing amplitude falls below a lower limit. Outgoing voice-currents pass from the two-wire circuit 1, 2 to the outgoing circuit T through amplifiers 5, 7, 8 and a loss circuit 6 wherein the signal currents pass through the series-connected anode-cathode paths of the valves 9, 10, so that a negative charge on the grids of these valves diminishes the gain of outgoing voice-currents. Incoming voice-currents pass from incoming channel R to the two-wire circuit 1, 2, through step-up transformers 23, 24, step-down transformers 25, 26, amplifier 98, and a loss circuit 27 which contains as shunts the cathodeanode paths of the valves 28, 29, so that a negative charge on the grids of these valves increases the gain of incoming signals. The grids of all four valves 9, 10, 28, 29 are connected to the plate 35 of a condenser, so that the state of this condenser determines the gain. Before conversation begins, relays 48, 50 are in the released position as shown and condenser-plate 35 is insulated. As soon as valve 5 is influenced by speech, relay 48 is operated (through valves 57, 59, 61) and discharges any negative charge on condenser-plate 35, so as to establish a high gain for outgoing signals. When the strength of the amplified currents outgoing from valve 8 rises above a prescribed lower limit, relay 50 is operated through valves 8, 65, 66 and, by causing battery 64 to block the grid of valve 57, it releases relay 48 so as to insulate the condenser-plate 35. During normal speech, relay 48 remains de-energized, as shown, while relay 50 remains energized. If, however, the strength of the currents outgoing from valve 8 rises above a prescribed upper limit, a negative charge is supplied by valves 36 .. 39 to condenserplate 35 so as to reduce the gain of outgoing and increase that of incoming speech-currents. When the strength of the outgoing speechcurrents again falls below its prescribed upper limit, the charging of condenser-plate 35 ceases, but the relays 48, 50 remain in the resting and operated positions, respectively. When the outgoing speech currents cease after having been at normal strength, relay 50 releases, but if speech recommences after a brief interval the relay 48 remains at rest as shown, since the valve 57 is blocked by the charge on condenser 62. If during speech the outgoing signal strength falls permanently below the lower limit, relay 50 releases and thereafter relay 48 operates and discharges the condenser-plate 35 as soon as the charge on condenser 62 has leaked away.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US445543A US1853974A (en) | 1930-04-19 | 1930-04-19 | Transmission system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB367616A true GB367616A (en) | 1932-02-25 |
Family
ID=23769324
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB10526/31A Expired GB367616A (en) | 1930-04-19 | 1931-04-09 | Improvements in or relating to two-path two-way telephone and like transmission systems |
Country Status (4)
Country | Link |
---|---|
US (1) | US1853974A (en) |
DE (1) | DE565904C (en) |
FR (1) | FR715569A (en) |
GB (1) | GB367616A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE882420C (en) * | 1938-04-12 | 1953-07-09 | Siemens Ag | Circuit arrangement for feedback locks in loudspeaker systems |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2164344A (en) * | 1938-04-28 | 1939-07-04 | Bell Telephone Labor Inc | Signal transmission system |
-
1930
- 1930-04-19 US US445543A patent/US1853974A/en not_active Expired - Lifetime
-
1931
- 1931-04-09 GB GB10526/31A patent/GB367616A/en not_active Expired
- 1931-04-11 DE DEE40997D patent/DE565904C/en not_active Expired
- 1931-04-17 FR FR715569D patent/FR715569A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE882420C (en) * | 1938-04-12 | 1953-07-09 | Siemens Ag | Circuit arrangement for feedback locks in loudspeaker systems |
Also Published As
Publication number | Publication date |
---|---|
US1853974A (en) | 1932-04-12 |
DE565904C (en) | 1932-12-07 |
FR715569A (en) | 1931-12-05 |
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