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GB970315A - Circuit arrangement for sending and receiving code signals - Google Patents

Circuit arrangement for sending and receiving code signals

Info

Publication number
GB970315A
GB970315A GB584761A GB584761A GB970315A GB 970315 A GB970315 A GB 970315A GB 584761 A GB584761 A GB 584761A GB 584761 A GB584761 A GB 584761A GB 970315 A GB970315 A GB 970315A
Authority
GB
United Kingdom
Prior art keywords
receiver
code
frequencies
output
adjacent
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
GB584761A
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 GB970315A publication Critical patent/GB970315A/en
Expired legal-status Critical Current

Links

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
    • H04Q1/44—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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies
    • 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
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

970,315. Electric selective signalling systems. TELEFONAKTIEBOLAGET L. M. ERICSSON. Feb. 16,1961 [Feb. 16, 1960], No. 5847/61. Heading G4H. [Also in Division H4] Signals comprising a combination of two frequencies out of a set of seven or two series pulses out of seven are transmitted to a receiver the output of which is inhibited if two adjacent frequencies in the set or two adjacent pulses are received. In the former case, a keyboard SS is used to select an appropriate combination of audio frequencies 1-7, the receiver MM comprising respective frequency-selective elements 1-7 arranged to mark two of the output leads 0, 1, 2, 4, 7, 10, X corresponding to the received frequencies. If, owing to interference, two adjacent leads are marked, the corresponding AND gate F-K is enabled, gate T is inhibited and gates M-S are closed to block the output of the receiver. A recoder UU converts the two out of seven code to a two out of six code which uses all fifteeen possible combinations. In Fig. 2 (not shown) the input to the transmitter is in two out of six code which is converted to the two out of seven code, transmitted in serial form by means of AND gates and a tapped delay line, and at the receiver again transformed to parallel form by a further tapped delay line, the signals then being processed as in the receiver of Fig. 1. The transmitter and receiver are synchronized by transmitting a selected code group every twenty code groups.
GB584761A 1960-02-16 1961-02-16 Circuit arrangement for sending and receiving code signals Expired GB970315A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE152160 1960-02-16

Publications (1)

Publication Number Publication Date
GB970315A true GB970315A (en) 1964-09-16

Family

ID=20258340

Family Applications (1)

Application Number Title Priority Date Filing Date
GB584761A Expired GB970315A (en) 1960-02-16 1961-02-16 Circuit arrangement for sending and receiving code signals

Country Status (3)

Country Link
BE (1) BE600277A (en)
DE (1) DE1125008B (en)
GB (1) GB970315A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2324006A (en) * 1997-04-02 1998-10-07 David Williams Electronic modulation scheme

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL292228A (en) * 1962-05-21
DE1232211B (en) * 1963-04-02 1967-01-12 Standard Elektrik Lorenz Ag Circuit arrangement for protection against incorrect response by receivers in telecommunications, in particular telephone systems with multi-frequency code dialing
DE1290563B (en) * 1963-07-16 1969-03-13 Siemens Ag Circuit arrangement for telecommunications systems with an asynchronous combination multiple
DE1248118B (en) * 1964-11-18 1967-08-24 Siemens Ag Circuit arrangement for receiving multiple, in particular two-frequency code characters sent in pulses in telecommunications, in particular telephone switching systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2324006A (en) * 1997-04-02 1998-10-07 David Williams Electronic modulation scheme
GB2324006B (en) * 1997-04-02 2001-08-22 David Williams Electronic modulation scheme

Also Published As

Publication number Publication date
BE600277A (en) 1961-06-16
DE1125008B (en) 1962-03-08

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