GB1098782A - Improvements to telephone subscribers' instruments - Google Patents

Improvements to telephone subscribers' instruments

Info

Publication number
GB1098782A
GB1098782A GB4971/66A GB497166A GB1098782A GB 1098782 A GB1098782 A GB 1098782A GB 4971/66 A GB4971/66 A GB 4971/66A GB 497166 A GB497166 A GB 497166A GB 1098782 A GB1098782 A GB 1098782A
Authority
GB
United Kingdom
Prior art keywords
coil
circuits
aerial
handset
inductive
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
GB4971/66A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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
Priority claimed from DEST22618A external-priority patent/DE1226650B/en
Priority claimed from FR5174A external-priority patent/FR1432760A/en
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1098782A publication Critical patent/GB1098782A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
    • 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
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephone Set Structure (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

1,098,782. Radio and inductive signalling; substation equipment and circuits. INTERNATIONAL STANDARD ELECTRIC CORPORATION. Feb. 4, 1966 [Feb. 11, 1965], No. 4971/66. Addition to 1,098,729. Headings H4J, H4K, H4L, H4R and H4U. A cordless handset for a telephone subscriber's apparatus comprises a dynamic microphone 4, Fig. 1, whose amplified output modulates a radio transmitter having a tank coil 1 coupled to a ferrite rod aerial 2, and an inductive pick-up coil 7, with a high-permeability core disposed at right-angles to the aerial 2, said coil 7 being connected via an audio amplifier, with negative feedback for reducing mains hum, to a receiver 5. The handset circuits, Figs. 4, 5, 6 (not shown), are transistorized and are powered by secondary cells 8, which are disconnected from the circuits by a mercury switch 9 when the handset is replaced upon its cradle, and may then be charged from the telephone line, or by a mains charging unit provided, via three contacts 10, the outer pair of which are in parallel. The associated instrument body comprises an inductive transmitting loop 14, Fig. 3, which is driven by an amplifier unit 15, and a ferrite receiving aerial rod 11 with a winding 12, which is connected to an amplifying-detecting-output unit 13 having automatic gain control. The units 13, 15 are transistorized and power is supplied from -the telephone line through a cradle switch contact (49), Fig. 9 (not shown), and a series choke coil (34). A bridge rectifier (Fig. 10, not shown) may be provided to guard against line polarity reversal.
GB4971/66A 1964-09-01 1966-02-04 Improvements to telephone subscribers' instruments Expired GB1098782A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEST22618A DE1226650B (en) 1964-09-01 1964-09-01 Method and circuit arrangement for connecting subscriber stations with their handsets in telephone systems
FR5174A FR1432760A (en) 1965-02-11 1965-02-11 Improvements to telephone sets

Publications (1)

Publication Number Publication Date
GB1098782A true GB1098782A (en) 1968-01-10

Family

ID=25994274

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4971/66A Expired GB1098782A (en) 1964-09-01 1966-02-04 Improvements to telephone subscribers' instruments

Country Status (2)

Country Link
BE (1) BE690001A (en)
GB (1) GB1098782A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4993244A (en) * 1990-05-09 1991-02-19 Craig Osman Locking apparatus for a cellular phone
US5220270A (en) * 1992-04-24 1993-06-15 Automatic Technologies, Inc. Battery charging device with secured contact unit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570239B1 (en) * 1984-09-07 1988-07-15 Centre Nat Rech Scient EARPHONE, TELEPHONE HANDSET AND HEADSET FOR CORRECTING INDIVIDUAL HEARING DEFICIENCIES

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4993244A (en) * 1990-05-09 1991-02-19 Craig Osman Locking apparatus for a cellular phone
US5220270A (en) * 1992-04-24 1993-06-15 Automatic Technologies, Inc. Battery charging device with secured contact unit

Also Published As

Publication number Publication date
BE690001A (en) 1967-05-02

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