US1908574A - Impulse transmitting arrangement - Google Patents
Impulse transmitting arrangement Download PDFInfo
- Publication number
- US1908574A US1908574A US591741A US59174132A US1908574A US 1908574 A US1908574 A US 1908574A US 591741 A US591741 A US 591741A US 59174132 A US59174132 A US 59174132A US 1908574 A US1908574 A US 1908574A
- Authority
- US
- United States
- Prior art keywords
- impulse
- relay
- circuit
- current
- impulses
- 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 - Lifetime
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/48—Induced-current signalling arrangements
Definitions
- the present invention refers to arrangements for the transmission of impulses over long lines. More particularly the invention refers to plants in which the impulses on the transmission line are generated through reversals of the direction of the current in a local impulse circuit which is inductively connected to the line. The current in the local impulse circuit is thus subjected to variations 19 which are equal to the double current amplitude, said current variations in turn causing inductive current impulses on the line.
- impulse transmitting plants of the kind in question at least two impulses are generated in addition to the impulses belonging to the impulse series, namely one impulse when the intermediate impulse circuit is energized and another impulse when said intermediate circuit is deenergized. Said extra impulses may in some cases be used for different purposes, but in other cases they are less desirable.
- the present invention has for its object to provide a method for the elimination of said current impulses or other impulses which are not desirable and consists therein, that the transmission line is in one or more places provided with arrangements for suppressing certain impulses.
- Figure 2 is a current diagram
- FIG. 3 illustrates an application of the invention.
- the reference numeral 1 designates the impulse contact of an impulse send er, for instance a finger disc.
- the impulse contact 1 is connected in series with the wind ing 2 of a contact relay the contact set of which is arranged as .a current reverser or pole changer in a local intermediate circuit including the primary winding of a transformer T the secondary winding of which is connected to the telephone line L.
- the said intermediate circuit is interrupted when a conversation is not going on.
- the positive pole of the appertaining impulse battery is connected to one terminal of the transformer T by means of a choke coil 3 and a normally closed contact 4 belonging to the contact set of the relay 2, and'the negative pole is connected to the other terminal by means of a choke coil 3 and a normally closed contact 4 of the relay.
- the primary winding of the transformer T is then passed by a current in the direction of the arrow 7.
- the relay 2 attracts its armature the contacts 4, 4 are opened and the poles of the battery are instead connected to the transformer by means of the normally open contacts 5, 5, the direction of the current in the primary winding of the transformer being then. reversed.
- the secondary winding of the transformer may be arranged to be short-circuited by means of the contact 8 of a relay 9. Said relay is intended to beactuated only when not desirable currentsappear on the line.
- the intermediate imp-ulseci-rcuit including the primary winding of the transformer T is closed.
- thelocal circuit thusbegins to increase in a positive direction and will after a certain short time reach its full value L.
- the closing of the impulse circuit proper which circuit includes the relay winding 2
- the closing of the impulse circuit proper may, if desired, also be effectedwhen the microtelephone of the subscriber is lifted off but is delayed somewhat by av suitable mechanical or electromagneti cal delaying arrangement and therefore takes place first at the point of time 23 ( Figure 2a) when the current in the primary circuit of the transformer has already reached its fullvalue. WVhen' the current was closed in the intermediate circuit a. current impulse a" ( Figure 20). was, however, sent out on the line whichcurrent impulse may serve to set the polarized relay 6 in its starting-position in casethe relay does not already take up this position.
- A designates, for instance, a subscribers set or the impulse sender of an operator.
- The'impulses are sent through transformers T T and T T to or from a station not shown on the drawing, it being assumed in the following that the impulses are sent from the subscribers position A.
- the relay GY attracting its arma ture first and then the relay RU.
- the latter relay By means of its normally open contacts 16 and 17 the latter relay now closes the impulse circuit 15 through the primary windings of the transformers T T a call signal being then sent over the line to the call-ed station.
- the relay VR attracts its armature, said relay being slow-acting when energized over the circuit 18, and interrupts at its contact 19 the circuit 14 for the relays GrY and RU.
- Said relays are then deenergized in the following order. First the relay GY is deenergized, forming a circuit 20 for the relays GY and GY After some time the relay RU is deenergized, interrupting the call signal.
- the impulse induced through the current variation at the interruption is, howeveiysuppressed thereby, that the short-circuit of the windings of the transformers T T is maintained by means of the contacts 21, 22, 23 of the slow-acting relays GY GrY even for some time after the relay RU has been deenergized.
- the times of operation of the relays GY and GrY are determined so that the subscriber may start the impulse sending immediately. Therelays PR IE and SR then pulsate in a predetermined sequence.
- the relays RU and GrY keep their armature attracted and the current impulses are therefore, through the intermedium of the impulse circuit 15, sent through the transformers T and T to the called station.
- the relay GY is during the impulse series maintained energized through the intermittently closed circuit 47.
- the primary windings of the transformers T5, T are short-circuited and the impulse sending is improved.
- the extra impulse z' occuring after each impulse series is suppressed in the above described manner thereby, that the relay GrY is deenergized previously to the relay RU, the former relay then closing the circuit for the relays GY and GY.
- an inductive impulse is sent through the transformers T and T which impulse shifts the armature of the relay PR and closes a circuit 24 for the relayVIR Said latter relay is energized and closes a circuit 25 through the relay VR-
- This relay attracts its armature and removes the short-circuit of the secondary winding of the transformers T and T which are thereby prepared for receiving the speech, and closes a circuit 26 for the relay GY. which attracts its 7 armature and closes a speaking circuit for the subscriber A,
- a transformer a direct current circuit connected to the said telephone line by means of the said transformer, an impulse relay controlling the said direct current circuit and an auxiliary relay set adapted in cooperation with the said impulse relay to suppress extra impulses generated at the transmission.
- auxiliary relay set is adapted to prevent a current interruption in the direct current circuit following upon a current closing in said circuit from causing impulse generation in the telephone line.
- a telephone line a transformer, a direct current circuit connected to the said telephone line by means of the said transformer, an impulse relay controlling the said direct current circuit, an auxiliary relay set adapted in cooperation with the said impulse relay to suppress extra impulses generated at the transmission and to effect a current closing of short duration in the direct current circuit so as to bring about such an alteration in the circuit during the time interval between the current closing and the subsequent current interruption that the influence of the current interruption on the telephone line is neutralized.
- the secondary winding of the transformer is adapted to be short-circuited in the time interval between the current closing and the current interruption in the direct current circuit.
- a telephone line a transformer, a direct current circuit connected to the said telephone line by means of the said transformer, an impulse relay controlling the said direct current circuit and adapted to effect a reversion of the direction of the current in the direct current circuit each time said relay attracts or drops its armature respectively, and an auxiliary relay set adapted in cooperation with the said impulse relay to suppress extra impulses generated at the transmission.
- a telephone line a transformer, a direct current circuit connected to the said telephone line by means of the said transformer, an impulse relay controlling the said direct current circuit, an auxiliary relay set adapted in cooperation with the said impulse relay to suppress extra impulses generated at the transmission and comprising two mutually cooperating slowacting relays one of which is adapted to effect a closing of short duration of the direct current circuit when the impulse relay attracts its armature whereas the other relay is adapted to short-circuit the secondary Winding of the transformer which shortcircuit lasts until the direct current circuit is interrupted.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1845571X | 1929-08-20 | ||
SE621696X | 1929-08-20 | ||
SE1908574X | 1931-02-11 | ||
SE396719X | 1931-02-11 | ||
SE731244X | 1931-02-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
US1908574A true US1908574A (en) | 1933-05-09 |
Family
ID=27532734
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US591741A Expired - Lifetime US1908574A (en) | 1929-08-20 | 1932-02-08 | Impulse transmitting arrangement |
Country Status (2)
Country | Link |
---|---|
US (1) | US1908574A (de) |
DE (1) | DE621696C (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2563311A (en) * | 1944-06-02 | 1951-08-07 | Comp Generale Electricite | Antidistortion device for receiving and retransmitting impulses |
US2839605A (en) * | 1952-06-27 | 1958-06-17 | Int Standard Electric Corp | Telegraph repeaters |
-
1930
- 1930-08-19 DE DE1930621696D patent/DE621696C/de not_active Expired
-
1932
- 1932-02-08 US US591741A patent/US1908574A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2563311A (en) * | 1944-06-02 | 1951-08-07 | Comp Generale Electricite | Antidistortion device for receiving and retransmitting impulses |
US2839605A (en) * | 1952-06-27 | 1958-06-17 | Int Standard Electric Corp | Telegraph repeaters |
Also Published As
Publication number | Publication date |
---|---|
DE621696C (de) | 1935-11-12 |
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