GB1284960A - Telephone subscriber's instruments - Google Patents

Telephone subscriber's instruments

Info

Publication number
GB1284960A
GB1284960A GB28279/70A GB2827970A GB1284960A GB 1284960 A GB1284960 A GB 1284960A GB 28279/70 A GB28279/70 A GB 28279/70A GB 2827970 A GB2827970 A GB 2827970A GB 1284960 A GB1284960 A GB 1284960A
Authority
GB
United Kingdom
Prior art keywords
handset
transmitter
radio
june
receiver
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
GB28279/70A
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
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1284960A publication Critical patent/GB1284960A/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
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H04M1/72502—Cordless telephones with one base station connected to a single line

Landscapes

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

Abstract

1284960 Radio signalling; substation equipment INTERNATIONAL STANDARD ELECTRIC CORP 11 June 1970 [16 June 1969] 28279/70 Headings H4K and H4L In a cordless telephone in which radio units in the handset and the instrument body on which the handset rests when not in use convey speech signals between the handset and the body, a variable gain amplifier in the radio transmitter circuit in the body provides maximum gain at the lowest input speech signal level and reduces the gain as the level increases, and in the handset the transmitter and receiver are coupled by means additional to the coupling via the hybrid and variable gain amplifier in the instrument body, to ensure that a minimum level of sidetone signal is available. As described the transmitter and receiver in the handset are coupled via a resistor, a capacitor, or a transformer.
GB28279/70A 1969-06-16 1970-06-11 Telephone subscriber's instruments Expired GB1284960A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691930534 DE1930534A1 (en) 1969-06-16 1969-06-16 Circuit arrangement for maintaining a small reception and sufficient back-up reference damping in a telephone station with a cordless handset

Publications (1)

Publication Number Publication Date
GB1284960A true GB1284960A (en) 1972-08-09

Family

ID=5737159

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28279/70A Expired GB1284960A (en) 1969-06-16 1970-06-11 Telephone subscriber's instruments

Country Status (2)

Country Link
DE (1) DE1930534A1 (en)
GB (1) GB1284960A (en)

Also Published As

Publication number Publication date
DE1930534A1 (en) 1970-12-23

Similar Documents

Publication Publication Date Title
GB1423577A (en) Loudspeaking telephone station circuit
CA2127269A1 (en) Aural annunciator circuit for a receiver
GB916545A (en) Improvements in or relating to loud speaking telephone sets
ES8105125A1 (en) Circuits and processes for initializing the loop current of a telephone set.
GB1350205A (en) Telephone subscribers instrument circuits
GB1284960A (en) Telephone subscriber's instruments
GB1098729A (en) Telephone subscribers' instruments
GB910772A (en) Improvements in continuous tone-controlled squelch system
GB971802A (en) Signalling system for substation apparatus
GB1189377A (en) Improvements in or relating to Telephone Subset Speech Circuits
GB1375919A (en) Telephones
GB1255296A (en) Subscriber's telephone instruments
GB661554A (en) High frequency pre-emphasis for pulse code modulation
GB951124A (en) A telephone subscriber's set
FR2271725A1 (en) Telephonic conference system with speech detector - enables speech from one participant to block all other transmissions
KR920011070B1 (en) Side tone prevention circuit
GB1047522A (en) Improvements in or relating to variable impedance electrical circuits
GB1154262A (en) Telephone Subscriber's Instrument
GB1297688A (en)
JPS55115761A (en) Radio unit
ES8301085A1 (en) Telephone apparatus provided with a preamplifier with carrier current, an interrupter for disconnection of the microphone and a device for signalling this disconnection.
JPS5468102A (en) Sound reinforcement system
GB1098782A (en) Improvements to telephone subscribers' instruments
GB1347808A (en) Portable transmitter receiver
FR2271726A1 (en) Telephonic conference system with speech detector - enables speech from one participant to block all other transmissions

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees