BE379629A - - Google Patents

Info

Publication number
BE379629A
BE379629A BE379629DA BE379629A BE 379629 A BE379629 A BE 379629A BE 379629D A BE379629D A BE 379629DA BE 379629 A BE379629 A BE 379629A
Authority
BE
Belgium
Prior art keywords
emi
currents
fact
telephone
communications
Prior art date
Application number
Other languages
English (en)
French (fr)
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.)
Publication of BE379629A publication Critical patent/BE379629A/fr

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04KSECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00Secret communication
    • H04K1/02Secret communication by adding a second signal to make the desired signal unintelligible

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
BE379629D 1931-05-07 BE379629A (enrdf_load_stackoverflow)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE735902X 1931-05-07

Publications (1)

Publication Number Publication Date
BE379629A true BE379629A (enrdf_load_stackoverflow)

Family

ID=3879300

Family Applications (1)

Application Number Title Priority Date Filing Date
BE379629D BE379629A (enrdf_load_stackoverflow) 1931-05-07

Country Status (2)

Country Link
BE (1) BE379629A (enrdf_load_stackoverflow)
FR (1) FR735902A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
FR735902A (fr) 1932-11-17

Similar Documents

Publication Publication Date Title
US2145717A (en) Multiplex telecommunication system
Kim et al. A review of assistive listening device and digital wireless technology for hearing instruments
US20050175189A1 (en) Dual microphone communication device for teleconference
US3718765A (en) Communication system with provision for concealing intelligence signals with noise signals
US9049402B2 (en) Method of synchronizing the playback of an audio broadcast on a plurality of network output devices
US8170229B2 (en) Audio privacy apparatus and method
BE379629A (enrdf_load_stackoverflow)
TW200412176A (en) Apparatus and method for generating a directional acoustic wave
US7532714B1 (en) Method for discrete communication with a meeting speaker during a teleconference
FR2680934A1 (fr) Dispositif d'amplification pour un reseau de distribution de television par cable.
US3908094A (en) Telephone transceiver with amplified microphone and speaker
US7471945B2 (en) Methods and apparatus for preventing a third party from overhearing a telephone conversation
US6937875B2 (en) Mobile telephone with local communication option
US2269565A (en) Communication system
US1647242A (en) Recording and reproducing system
Emling General aspects of hands-free telephony
US838545A (en) Multiple telegraphy and telephony.
US1416061A (en) Radioreceiving system having high selectivity
RU2103833C1 (ru) Устройство громкоговорящей связи
BE334338A (enrdf_load_stackoverflow)
US1537126A (en) Loud-speaker circuit
Killion Digital cell phones and hearing aids: The problem is mostly solved
JPH09307626A (ja) 拡声情報通信システム
FR3010597A1 (fr) Dispositif de communication sonore sans fil bidirectionnelle
US879438A (en) Telephony.