GB1228117A - - Google Patents

Info

Publication number
GB1228117A
GB1228117A GB1228117DA GB1228117A GB 1228117 A GB1228117 A GB 1228117A GB 1228117D A GB1228117D A GB 1228117DA GB 1228117 A GB1228117 A GB 1228117A
Authority
GB
United Kingdom
Prior art keywords
gain
key
line
control
automatic
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
Other languages
English (en)
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 filed Critical
Publication of GB1228117A publication Critical patent/GB1228117A/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
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Telephonic Communication Services (AREA)
GB1228117D 1968-12-20 1969-12-17 Expired GB1228117A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681816146 DE1816146B2 (de) 1968-12-20 1968-12-20 Schaltungsanordnung fuer lautfernsprechstationen

Publications (1)

Publication Number Publication Date
GB1228117A true GB1228117A (fr) 1971-04-15

Family

ID=5716962

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1228117D Expired GB1228117A (fr) 1968-12-20 1969-12-17

Country Status (9)

Country Link
AT (1) AT299334B (fr)
BE (1) BE743453A (fr)
CH (1) CH502731A (fr)
DE (1) DE1816146B2 (fr)
FR (1) FR2026658A1 (fr)
GB (1) GB1228117A (fr)
LU (1) LU60045A1 (fr)
NL (1) NL149661B (fr)
SE (1) SE345362B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2460575A1 (fr) * 1979-06-29 1981-01-23 Trt Telecom Radio Electr Poste telephonique d'abonne a niveau d'ecoute reglable
DE2937638C2 (de) * 1979-09-18 1981-11-26 Krone Gmbh, 1000 Berlin Rastfreie Taste als Ein-Aus-Schalter und zur Lautstärkeeintellung
US4497980A (en) * 1983-06-16 1985-02-05 Itt Corporation Handsfree circuit for telephone instrument

Also Published As

Publication number Publication date
AT299334B (de) 1972-06-12
NL6918526A (fr) 1970-06-23
FR2026658A1 (fr) 1970-09-18
CH502731A (de) 1971-01-31
DE1816146B2 (de) 1972-02-10
NL149661B (nl) 1976-05-17
DE1816146A1 (de) 1970-07-02
SE345362B (fr) 1972-05-23
LU60045A1 (fr) 1970-02-18
BE743453A (fr) 1970-06-19

Similar Documents

Publication Publication Date Title
GB553225A (en) Power line telephone system
GB1486791A (en) Telephone control systems
GB1228117A (fr)
US2567484A (en) Intercommunication telephone system
US2764632A (en) Intercommunication telephone systems
US2275406A (en) Intercommunication system
US1891299A (en) Radio telephone system
GB334869A (en) Improvements in transmission volume control systems for electric signalling
JPS56112166A (en) Receiving voice amplifying system for telephone set
US2590234A (en) Automatic selection of receiving channels
US2245756A (en) Communicating system
US2885477A (en) Exclusion arrangement for loudspeaking telephone systems
US2764637A (en) Telephone systems
US1200829A (en) Telephone signaling system.
US2141476A (en) Telephone system
US1210314A (en) Telephone toll system.
US3201522A (en) Common control switching system for radio circuits
US2623124A (en) Intercommunication telephone system
US2850569A (en) Electric arrangement for speech transmission in two directions
US2364068A (en) Remote control system
US1408046A (en) Telephone system
US2435302A (en) Telephone system having a calling and supervisory signaling device
US1628695A (en) toomey
US2848552A (en) Loud-speaking station for automatic telephone systems
GB677894A (en) Improvements in or relating to intercommunication telephone systems

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee