GB691237A - Improvements in or relating to voice frequency signalling systems - Google Patents

Improvements in or relating to voice frequency signalling systems

Info

Publication number
GB691237A
GB691237A GB17438/51A GB1743851A GB691237A GB 691237 A GB691237 A GB 691237A GB 17438/51 A GB17438/51 A GB 17438/51A GB 1743851 A GB1743851 A GB 1743851A GB 691237 A GB691237 A GB 691237A
Authority
GB
United Kingdom
Prior art keywords
register
tubes
relay
tube
line
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
Application number
GB17438/51A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB691237A publication Critical patent/GB691237A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • 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
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Abstract

691,237. Automatic exchange systems. TELEFONAKTIEBOLAGET L. M. ERICSSON. July 23, 1951 [July 21, 1950], No. 17438/51. Class 40 (iv). A subscriber transmits the called number to a register by pressing push-buttons to emit corresponding frequencies which pass through appropriate filters F1-F10 in the register to fire one or more gas tubes, the higher frequencies being substantially harmonics of the lower frequencies and the low-frequency filters F5-F10 being associated with two tubes, one of which is also associated with the filter passing a harmonic of said low frequency. A subscriber initiates a call by depressing button K, Fig. 1, which is locked down by a spring 17 and reverses contacts 15, 16 to close the line circuit through the filament of tube E1. A line relay starts a line-finder Sa-Sc, test relay SR3 pulling up when the calling line is encountered. A register-finder Va-Vc selects a free register, whereafter SR1 pulls up to close circuit over the loop, the filament of E1, wipers Va, Vb, relay R7 and tube E21. Tubes E21 and G2 feed tube E1 with a constant current irrespective of the resistance in the line. Tube E1 is thus energized and emits an audio-frequency signal over transformer T12, the signal being shaped by trigger E23 and passed over transformer T2 and through filter F11, Fig. 3, to actuate relay R6 which pulls up before the slugged relay R7. The first digit is transmitted by depression of one of push-buttons P1-P10 which changes the frequency of tube E1, one of filters F1-F10 responding to fire one or more of gas-tubes G31-G34 and actuate the corresponding relays R11-R14 which lock up. Simultaneously, release of R6 energizes both opposed windings of R5 and the upper winding of R4. When the signal ceases, filter F11 re-operates R6 to release the upper winding of R5 which then pulls up under the influence of its lower winding to actuate R1, which locks up so that the second digit fires one or more of tubes G35-G38 and the associated relays R15-R18. Similarly, operation of R2 causes the third digit to be registered on tubes G39-G42 and relays R19- R22 after which R3 pulls up to extinguish the fired tubes and indicate over lead t5 to the register that three digits have been entered. The register then functions in known manner and is released by earth on lead t6 operating SR2, which restores SR1, dismisses the register and establishes connection between leads a, b and a1, b1.
GB17438/51A 1950-07-21 1951-07-23 Improvements in or relating to voice frequency signalling systems Expired GB691237A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE691237X 1950-07-21

Publications (1)

Publication Number Publication Date
GB691237A true GB691237A (en) 1953-05-06

Family

ID=20315203

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17438/51A Expired GB691237A (en) 1950-07-21 1951-07-23 Improvements in or relating to voice frequency signalling systems

Country Status (4)

Country Link
US (1) US2706746A (en)
DE (1) DE886929C (en)
GB (1) GB691237A (en)
NL (2) NL81161C (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1001713B (en) * 1953-12-07 1957-01-31 Telefonbau & Normalzeit Gmbh Telephone subscriber station with button-controlled frequency selection and a microphone amplifier containing layer transistors
NL96910C (en) * 1954-10-25
DE1085201B (en) * 1955-01-19 1960-07-14 Josef Dirr Circuit arrangement for the evaluation of time-staggered alternating current pulses of a frequency transmitted over cordoned off lines for the identification of lines for billing in telecommunication systems, in particular telephone systems
DE1017661B (en) * 1956-01-30 1957-10-17 Telefonbau & Normalzeit Gmbh Device for sending numbers in the form of coded signals in telephone sets
DE1039107B (en) * 1956-06-28 1958-09-18 Standard Elektrik Lorenz Ag Circuit arrangement for electrical devices connected to a central battery via long-distance lines
US3076059A (en) * 1958-06-20 1963-01-29 Bell Telephone Labor Inc Signaling system
CH379584A (en) * 1958-09-03 1964-07-15 Standard Telephon & Radio Ag Electrical signaling device
DE1090273B (en) * 1959-05-09 1960-10-06 Philips Nv Circuit arrangement for evaluating signals of different frequencies in telecommunications systems
DE1082300B (en) * 1959-06-04 1960-05-25 Siemens Ag Circuit arrangement for subscriber stations in telecommunications, in particular telephone systems with keyboard selection
NL255940A (en) * 1959-10-02
DE1152447B (en) * 1960-03-10 1963-08-08 Neumann Elektronik Gmbh Interchangeable loudspeaker system with sound-controlled connection paths

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2250100A (en) * 1939-11-14 1941-07-22 Bell Telephone Labor Inc Signaling system
US2554201A (en) * 1946-06-19 1951-05-22 Ericsson Telefon Ab L M Key-sending automatic telephone signaling system

Also Published As

Publication number Publication date
NL81161C (en)
DE886929C (en) 1953-08-20
NL162796B (en)
US2706746A (en) 1955-04-19

Similar Documents

Publication Publication Date Title
GB691237A (en) Improvements in or relating to voice frequency signalling systems
US2568342A (en) Signaling method and system
GB553225A (en) Power line telephone system
US2420232A (en) Signaling system
GB283135A (en)
GB646288A (en) Improvements in automatic telephone systems
US3156775A (en) Telephone converter
GB704650A (en) Improvements in or relating to audio-frequency signalling systems
US2387671A (en) Alternating current signal receiver
US2496159A (en) Telephone system
US3299211A (en) Telephone signal reporting system
US2061227A (en) Signaling system
US2057898A (en) Telephone signaling system
GB630734A (en) Improvements in or relating to burglar and fire alarm systems
US2531221A (en) Delayed audible call signal for telephone substations
US2306067A (en) Telephone system
US2393354A (en) Telephone system
GB887275A (en) Improvements in receivers for voice-frequency electric signals
GB726240A (en) Improvements in and relating to high frequency communication systems
US2210620A (en) Electric signaling apparatus
US2428028A (en) Electrical signaling system
US2364068A (en) Remote control system
GB662930A (en) Improvements in or relating to signalling systems
US2193505A (en) Apartment house signaling and telephone system
GB321303A (en) Improvements in fire alarm systems in conjunction with telephone exchange systems