GB1091731A - Telephone receiver - Google Patents

Telephone receiver

Info

Publication number
GB1091731A
GB1091731A GB909665A GB909665A GB1091731A GB 1091731 A GB1091731 A GB 1091731A GB 909665 A GB909665 A GB 909665A GB 909665 A GB909665 A GB 909665A GB 1091731 A GB1091731 A GB 1091731A
Authority
GB
United Kingdom
Prior art keywords
resistance
condition
march
transformer
winding
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
GB909665A
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.)
Danfoss AS
Original Assignee
Danfoss AS
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 Danfoss AS filed Critical Danfoss AS
Publication of GB1091731A publication Critical patent/GB1091731A/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
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/002—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general without controlling loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

1,091,731. Substation circuits. DANFOSS A.S. March 3, 1965 [March 3, 1964], No. 9096/65. Heading H4K. Connected in parallel with a telephone receiver 1 (Fig. 2), is a crackling noise protective device consisting of a junctionless, non-rectifying solid state switching device 4, which when the voltage applied to it reaches a threshold value, switches from the high resistance to the low resistance condition and, when the current through it falls below a holding value, reverts to its original condition. In one arrangement the solid state switch 14 (Fig. 3) is connected in parallel with the receiver 11 through a step-up transformer 15. The transformer has windings 16, 17 of ratio 1 : 1. Winding 19 has considerably more turns than winding 16. A resistance 18 is provided. The switch in the high resistance condition exhibits a resistance of the order of megohms and in the low resistance condition a resistance of 1 ohm or less. It may consist of 67À5% tellurium, 25% arsenic and 7À5% germanium.
GB909665A 1964-03-03 1965-03-03 Telephone receiver Expired GB1091731A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED43786A DE1218529B (en) 1964-03-03 1964-03-03 Telephones

Publications (1)

Publication Number Publication Date
GB1091731A true GB1091731A (en) 1967-11-22

Family

ID=7047859

Family Applications (1)

Application Number Title Priority Date Filing Date
GB909665A Expired GB1091731A (en) 1964-03-03 1965-03-03 Telephone receiver

Country Status (4)

Country Link
BE (1) BE660305A (en)
DE (1) DE1218529B (en)
GB (1) GB1091731A (en)
NL (1) NL6502562A (en)

Also Published As

Publication number Publication date
DE1218529B (en) 1966-06-08
NL6502562A (en) 1965-09-06
BE660305A (en) 1965-06-16

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