GB957319A - Improvements in or relating to address signalling arrangements - Google Patents

Improvements in or relating to address signalling arrangements

Info

Publication number
GB957319A
GB957319A GB3138561A GB3138561A GB957319A GB 957319 A GB957319 A GB 957319A GB 3138561 A GB3138561 A GB 3138561A GB 3138561 A GB3138561 A GB 3138561A GB 957319 A GB957319 A GB 957319A
Authority
GB
United Kingdom
Prior art keywords
condenser
digit
transistor
keys
circuit
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
GB3138561A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB957319A publication Critical patent/GB957319A/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
    • H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/28—Modifications for introducing a time delay before switching
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Input From Keyboards Or The Like (AREA)

Abstract

957,319. Subscriber's number sending devices. PHILIPS ELECTRICAL INDUSTRIES Ltd. Aug. 31, 1961 [Sept. 3, 1960], No. 31385/61. Heading H4K. A subscriber's digit sender comprises a transistor cut-off by the charge on a condenser, which is then caused to discharge through a time constant circuit dependent on the digit to be sent, whereupon the transistor becomes conductive again. A differentiating circuit in the output of the transistor circuit thus produces pulses separated by an interval indicative of the digit to be sent. As shown operation of the hook-switch H charges reservoir condenser C 3 over the line L 1 , L 2 from the exchange battery and with transistor TR conducting condenser C 1 is charged with its right-hand plate positive. When a digit key is pressed to and one of keys t 1 . . . t 10 are closed whereupon the charge on C 1 cuts off TR to produce a negative pulse over condenser C 2 . Condenser C 1 , under the influence of the reverse polarity now applied over t 0 , discharges in a time determined by the value of the resistance switched in by the particular one of keys t 1 . . . t 10 . When the charge on C 1 reaches zero (or becomes slightly negative) transistor TR conducts again to produce a positive pulse over C 2 . When the key is released with t 0 open C 1 charges positively in preparation for the sending of the next digit. It is to be noted that two keys, e.g. t 1 and t 6 , are appropriate to each time constant. However, the push buttons for the two keys are arranged to operate a further contact t 11 to close one or other of contacts d, e to effect discrimination. Thus with contact d closed the pulses from condenser C 2 are applied directly to line, and with e closed they are applied via a polarity inverting transformer S. This transformer may be part of the substation anti-side-tone circuit. To prevent the condenser C 3 from interfering with the normal operation of the circuit a resistance may be included in series with it, said resistance being short circuited during signalling.
GB3138561A 1960-09-03 1961-08-31 Improvements in or relating to address signalling arrangements Expired GB957319A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL255555 1960-09-03

Publications (1)

Publication Number Publication Date
GB957319A true GB957319A (en) 1964-05-06

Family

ID=19752541

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3138561A Expired GB957319A (en) 1960-09-03 1961-08-31 Improvements in or relating to address signalling arrangements

Country Status (3)

Country Link
DE (1) DE1134113B (en)
GB (1) GB957319A (en)
NL (1) NL255555A (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1004234B (en) * 1953-06-19 1957-03-14 Siemens Ag Method for the implementation of switching orders in pulse trains by means of storage capacitors in telecommunication systems, in particular telephone systems
DE1057177B (en) * 1957-05-17 1959-05-14 Sueddeutsche Telefon App Kabel Electronic pulse generator for dialing digits in communications technology

Also Published As

Publication number Publication date
NL255555A (en)
DE1134113B (en) 1962-08-02

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