GB824236A - Improvements in or relating to telephone apparatus - Google Patents

Improvements in or relating to telephone apparatus

Info

Publication number
GB824236A
GB824236A GB3855457A GB3855457A GB824236A GB 824236 A GB824236 A GB 824236A GB 3855457 A GB3855457 A GB 3855457A GB 3855457 A GB3855457 A GB 3855457A GB 824236 A GB824236 A GB 824236A
Authority
GB
United Kingdom
Prior art keywords
substation
relating
divided
current
telephone apparatus
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
GB3855457A
Inventor
Walter George Mellors
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Publication of GB824236A publication Critical patent/GB824236A/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
    • H04M1/76—Compensating for differences in line impedance
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/62—Constructional arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

824,236. Substation circuits. GENERAL ELECTRIC CO. Ltd. Dec. 12, 1957 [Sept. 12, 1956], No. 38554/57. Divided out of 824,235. Addition to 743,024. Class 40 (4). A substation circuit receives current from a central battery exchange for powering the transmitter 5. The voltage of this current is stabilized by a resistance network including a thermistor 8, is rectified by a bridge 9 of germanium diodes and supplies a transistor 4 amplifying speech currents supplied to the receiver 3. This circuit is also included in Specification 824,235 from which the present application is divided.
GB3855457A 1956-09-12 1956-09-12 Improvements in or relating to telephone apparatus Expired GB824236A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2792856A GB824235A (en) 1956-09-12 1956-09-12 Improvements in or relating to telephone handsets

Publications (1)

Publication Number Publication Date
GB824236A true GB824236A (en) 1959-11-25

Family

ID=10267541

Family Applications (2)

Application Number Title Priority Date Filing Date
GB2792856A Expired GB824235A (en) 1956-09-12 1956-09-12 Improvements in or relating to telephone handsets
GB3855457A Expired GB824236A (en) 1956-09-12 1956-09-12 Improvements in or relating to telephone apparatus

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB2792856A Expired GB824235A (en) 1956-09-12 1956-09-12 Improvements in or relating to telephone handsets

Country Status (1)

Country Link
GB (2) GB824235A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142509A (en) * 1983-06-28 1985-01-16 Emhart Ind Audio amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142509A (en) * 1983-06-28 1985-01-16 Emhart Ind Audio amplifier

Also Published As

Publication number Publication date
GB824235A (en) 1959-11-25

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