US1460814A - Voice-current telephone repeater - Google Patents

Description

July 3, 1923.

1,460,814 1 .J. H. HOIMRIGHOUS VOICE CURRENT TELEPHONE REPEATER Filed March 27 1919 J/Jhn figgummghnus.

Patented July 3, 1923.

.UNITEDSTATES PATENT orrice.

JOHN H. HOMRIGHOUS, OF OAK PARK, ILLINOIS, ASSIGNOR TO AUTOMATIC ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

VOICE--CUEEENT TELEPHONE REPEATER.

Application filed March 27, 1919. Serial No. 285,586.

To all whom it may concern:

Be it known that I, JOHN H. Homers- I-rous, a citizen of the United States of America and resident of Oak Park, in the county of (look and State of Illinois, have invented certain new and useful Improvements in Voice-Current Telephone Eepeaters, of which the following is a specification.

My invention relates in general to voice current repeaters for use intelephone systems, and more specifically to the amplification and transmission of voice currentsin both directions. Among the features of my invention is to provide in such a system a repeater circuit, which is normally in full repeating relation in both directions, that is, it does notrequire a voice controlled switch for putting into communicationthe two terminating telephone stations, further teaturesare the provision of voice operated circuit changing means so as to prevent the so called singing of the repeater system, by controlling the circuits of the system in such a manner thatthe amplifying device in the end opposite to that of thereceiving end is inoperative during speech transmi sion. A further object of the system described herein is the provision of a special form of alternating current relay for use in the repeater circuit.

Repeaters for accomplishing certain. of

the above results have been used, but so far none have been designed which, while in normally full repeating relations in both directions will automatically adjust itself with reference to the desired direction of speech transmission, without a complicated arrangement of circuits and devices being used or without a large loss of energy. It is thought that the following description of my improved repeater will make clear to one skilled in the art that these results have been accomplished by the arrangement shown in the drawings in a very highly desirable form in which the transmission loss is practicallynegligible. Having pointed out the features of my invention and the general method of accomplishing the desired results, I will now describe theoperation in detail by. referring to the accompanying drawings.

In the drawings Fig. 1 represents the out my invention.

core pieces 14 and 15 for the coils 16. Above the core pieces 14. and 15 a narrow strip of flexible material 17 which irorms the arma ture for the relay is suspended. betweeirthe upper extremities of a U shaped member 18, which member is rigidly secured to the base plate 5 by means oi screws, best shown in Fig. 3. Projecting downward from the lever 19 is astem 20 which passes through an opening in the armature 17 and is firmly secured thereto by nuts. One end of the lever 19 is pivoted to the member 21; the opposite end is provided with a contact which in normal position rests between the contacts on springs 7 and 10. The springs 7 to 10 inclusive, are secured to the mem her 6 which is firmly fastened to the base plate 5. Near the end 01 member 6 a por tion 11 is formed into a U shaped structure so that the screw 13 in the lower end passes through an opening in spring 10 and rest against the heavy spring 9. Likewise the screw 12 passes through an opening in the spring '7 and rest against the heavy spring 8. The light springs Tend 1.0 are tensioned to follow the heavy springs 8 and S) respectively, so that by means of the adjusting screws 12 and 1.3 the contacts on the springs 7 and 10 maybe brought as close to the contact on the lever 19 as desirable. The operation is as follows: When the armature 17 is caused to vibrate by alternating or undulating current flowing through the coils 16. the lever 19 will vibrate and make contact with the springs 7 and 10. The'springs 7 and 10 will follow the lever 19, that is, the lever 19 will contact with spring 7 before spring 10 breaks contact, and vice versa. By connecting the springs 7 and 10 together, a circuit may be closed by the lever 19 con tacting either springythat is, when the armature 17 is flexed in either direction responsive to the first alternation of current in the coils- 16 oneoi the springs will be contacted. Therefore, it will be seen that I have devised a very eflicient sensitive alternating current relay which, is adapted for,

3, the rei many uses, and which may be, arranged to operate with voice current. Referring now to Figure 1 of the drawings, E and F represent the ends of toll lines between'which is inserted the two-way'repeat ing apparatus. 30 and 31 representdiagrammatically one way repeaters, Repeater 30 is arranged for repeating voice currentstraveh ing in the direction from F to E andrepeater 31 is arranged for repeating voice currents throughywinding 37' in series with primary winding, 36 which Winding is inductively connected o through secondary winding 39 of a transformer to thevenergizing portion of repeater 30in bridge with the sensitive re lay 38". I The transmitting circuit" or reinforcing portion ofrepeater 30 isinductively connected through primary winding 34 and secondary. winding 33 to the line E. The sensitive relays 37 and38 are preferably of the; type herein before, described in conneo tion with FiguresQ and 3. Relay 37, which I isoperated by thevoice currents induced in the receiving circuit of repeater 31 via line, E controls a second relay 39 which relay 39" is normally partially energized by means of its lowerw-inding 'sothat it will operate its armaturequickly when the circuit for its upper winding is closed. Springs 41: controlled by relay 39 are arranged to short circuit the electromagnet of repeater-BO-and the sensitive relay 38. Likewise, the sensitive relay 38" controls a: relay 40 similar to the relay 39", which relay 40 is adapted to short circuitthe electromagnet ofrepeater 31 w and the relay 37. The operation of the system described above is as follows: When comparatively weak or attenuated voice currents reach the two-way repeater, circuit via line E, the

g electromagnetof repeater 3'1 and the sensiti ve' relay 37 will be energized in multiple through primary winding 32 and secondary winding 35 of the receiving circuit associated with line E. The flowof voice current through the windingsof relay 37' causes its armature to vibrate in a manner hereinbefore described to close a circuit for the upper winding of relay 39. Relay 39 will new" energize as the two-windings assist each other, to short circuit at springs 41,

ing of the repeater circuit; The electromagnet of repeater 31 which is energized in multiple with relay. 37', will agitate its microphone in a'manner well known in the art, to set up variation of current strength in the local circuit consisting of battery B and primary winding 38, The current changes produced in the winding 38 cause a current of increasedrvoltage to be induced in the winding 37. Therefore amplified voice currents will flow over line F.

The operation of the two-way repeater circuit for voice currents reaching it via. line connection F will be similar to theoperation just described, since the two-way repeater circuit shown. isasymmetrical arrangement.

Thevsprings 43 controlled by the relay-3W are adapted to control a normally opentransmitting circuitof repeater 31, that is, the circuit consisting of battery B and winding 38- would be closed at Springs 43 upon the operation: of relay 39". Likewise thersprings 44 may control a normally open transmittingcircuit of; repeater 30 It will be seen therefore, that I have pro 1 vided a very. simple and, highly desirable type of voice current repeater in which the two terminating stations are normally in full repeating relation; in eitherdirection.

Having fully described and: ascertained, the features of my'invention and method of accomplishing the. desired results, I will point out in the appended; claims what I consider to be new and desire to have protected by Letters Patent.

What I claim as my invention is:

1. In a telephone system, a pair of lines joined by a two-way repeating apparatus, said apparatus; consisting of two repeaters each normally in full repeating relation to one of said lines, and a voice current controlled circuit changing device included in the energizing circuit of each repeater and operating with its associated repeater to render the other repeater inoperative.

2. In a telephone system, a pair or lines joined by a two-way repeating apparatus, said apparatus consisting ofitwo repeaters each normally in full repeating relation to one of said lines, an energizing circuit for each repeater, a voice current controlled circuit changing device electrically con-f nected in multiple with the energizing circuit of each repeater, and ci'rcuiits wherebythe device in the circuit of onerepeater ran ders the other repeater inoperative while said first repeater is operating to repeat voice currents.

3. In a telephone system, a pair or lines joined by a two-way repeating apparatus,

said apparatus consisting oftwo repeaters each normally in full repeating relation to one of said lines, an energizing circuit for each repeater, a voice current controlled circuit'changing device in the energizing circuit of each repeater, and means whereby the device in the energizing circuit of one repeater renders the other repeater inoperative while saidlirst repeater is operating to repeat voice currents.

4. In a telephone system, a pair of lines joined by a two-way repeating apparatus, said apparatus consisting of two repeaters each normally in full repeating relation to one of said lines, an energizing circuit for each repeater, a voice actuatedcircuit controlling device in the energizing circuit of each repeater, and; means whereby each de vice renders a different one of said repeaters inoperative while the other repeateris operating to repeat'voice currents.

5. In a telephone system, a pair o'f'lines joinedby a two-way repeating apparatus,

said apparatus consisting of two repeaters each normally in full repeating relation to one or" said lines, an energizing circuit for each repeater, a voice current controlled circuit changing device in the energizing circuit of eachrepeater, and means whereby the device in the energizing circuit of one repeater renders the other repeater and its associated device inoperative while said first repeater is operating to repeat voice currents; j j

6. In a telephone system, a pair of lines joined by a two-way repeating apparatus, said apparatus consisting of two repeaters each normally in full repeating relation to one of said lines, an energizing circuit for each repeater, a voice current controlled circuit changing devices in the energizing circuit of each repeater, and circuit connections whereby the device in the energizing circuit of one repeater short-circuits the energizing circuit of the other repeater while said first repeater is operating to repeat voice currents.

7. In a telephone system, a pair of lines joined by a two-way repeating apparatus, said apparatus consisting of two repeaters each normally in full repeating relation to one of said lines, an energizing circuit for each repeater, a voice current controlled device in the energizing circuit of each re peater, and circuit changing means controlled by said devices arranged to render the energizing circuit of a respective one of said repeaters inoperative.

8. In a telephone system, a pair of lines joined by a two-way repeating apparatus, said apparatus consisting of two repeaters each normally in full repeating relation to one of said lines, an energizing circuit for each repeater, a voice current controlled device in the energizing circuit of each repeater, and relays controlled by said. devices, each of said relays arranged to render one of said repeaters inoperative.

9. In a telephone system, a pair of lines joined by a two-way repeating apparatus, said apparatus consisting of two repeaters. each normally in full repeating relation to one of said lines, an energizing circuit for each repeater, a voice current controlled device in the energizing circuit of each repeater, and direct current relays controlled. by said devices, each of said relays arranged to render one of said repeaters inoperative.

10. In a telephone system, a pair of lines joined by a two way repeating apparatus, said apparatus consisting of two repeaters each normally in full repeating relation to one of said lines, an energizing circuit for each repeater, a sensitive relay in metallic relation to the energizing circuit of each repeater, and direct current relays controlled by said sensitive relays, each direct current relay arranged to render one of said repeaters inoperative.

11. In a telephone system, a pair of lines joined. by a two way repeating apparatus, said apparatus consisting of two repeaters each having an electromagnet and each normally in full repeating relation to one of said lines, a circuit for each of said electromagnets, a sensitive relay in multiple with the circuit of each electromagnet, and direct current relays controlled by said sensitive relays, said direct current relay arranged to render one of said repeaters inoperative while said other repeater is operating to repeat voice currents.

12. In a telephone system, a pair of lines joined by a two-Way repeating apparatus, said apparatus consisting of two one-way repeaters each having an electromagnet and each normally in full repeating relation to one of said lines, a circuit for each of said electromagnets, a sensitive relay in the circuit of each electromagnet, and normally partially energized relays controlled by said sensitive relays, each one of said second relays arranged to render one of said repeaters inoperative while the other one of said repeaters is operating to repeat voice currents.

13. In a telephone system, a pair of lines joined by a two-way repeating apparatus, said apparatus consisting of two one-way repeaters each having an electromagnet and each normally in full repeating relation to one of said lines, a circuit for each of each electromagnets, a sensitive relay in the circuit of one of said electromagnets, and a nor-- mally partially energized relay controlled by said sensitive relay and arranged to short circuit the electromagnet of the other repeater while said first repeater is operating to repeat voice currents.

14. In a telephone system, a pair of lines joined by a voice current repeater always termers, the devices associatedwith said first in fullrepeating-relation to one of said lines, comprising an amplifier for repeating in each direction over said lines, and a voice current controlled switching device for each line connected directly to: the energizing circuit of each of said amplifiers, each device. controlled from its 'associated'lineto short circuit one of said amplifiers.

15. In a telephone system, a line, a transformer for said line, a second line, a transformer for said second line, an energizing circuit for each transformer, voice current controlled devices associated with eachv line and connected in multiple-With the energiz- I in-g circuit of each of said transformers, and

circuits whereby each device short-circuits a Winding of one of said transformers.

16. In a tcle-phonefsystem a line, a trans.- iiormer for said line, a second line, a transr former forsaid second line, an energizing circuit for each transformer, voice current controlled circuit changing devices, associated with each line connected directly to. the energizing circuit of each of said transline andcontrolled thereoverheing arranged to short circuit a Winding of the transformer of; said second line.-

17. In a telephone system, a pair of lines joined by a two-Way repeating apparatus,

pea-ten and operating with its amociated re peater to render the other repeater inoperative.

18. In a telephone system, a pair of lines joined by a two-We repeating apparatus, said apparatus consisting of two one-way repeaters each having an electromagnet and each normally in full repeating relation to one of said lines, a. circuit for each of said. electromagnets, a sensitive relay in the circuit 01? each one. of said electromagnets, a relayhaving two, windings, one of said windings permanently energized and the other controlled by one of said sensitive relays to cause saidrelayto short circuit the electromagnet ozfi'one repeater while the other repeater' is operating to repeat voice currents, and a similar double wound relay controlled by the other of said sensitive relays.

19'. In a telephone system, a pair of lines joined by a two-Way repeating apparatus, said apparatus consisting of two repeaters each having a multiple circuit included therein comprising a transformer winding, and a plurality of relays, said relays all 0 erable in response to a current induced in the transformer, one of said relays for operating an amplifying device to transmit ampligfied voice currents to one of said lines and the other relay operating to make the amplifying device associated with the other line inoperative.

Signed by me at Chicago, Cook County, Illinois, this 25th day of March, 1919.

JOHN H. HOMRIGHOUS.

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