GB1232974A - - Google Patents

Info

Publication number
GB1232974A
GB1232974A GB1232974DA GB1232974A GB 1232974 A GB1232974 A GB 1232974A GB 1232974D A GB1232974D A GB 1232974DA GB 1232974 A GB1232974 A GB 1232974A
Authority
GB
United Kingdom
Prior art keywords
transistors
channel
photo
attenuation
signal
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 GB1232974A publication Critical patent/GB1232974A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Optical Communication System (AREA)
GB1232974D 1967-06-16 1967-06-16 Expired GB1232974A (enrdf_load_stackoverflow)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2795267 1967-06-16

Publications (1)

Publication Number Publication Date
GB1232974A true GB1232974A (enrdf_load_stackoverflow) 1971-05-26

Family

ID=10267918

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1232974D Expired GB1232974A (enrdf_load_stackoverflow) 1967-06-16 1967-06-16

Country Status (1)

Country Link
GB (1) GB1232974A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174578A (en) * 1985-05-04 1986-11-05 Stc Plc Loudspeaking telephone
US4980908A (en) * 1989-05-30 1990-12-25 Voicetek Corporation Voice-switched gain control for voice communication equipment connected to telephone lines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174578A (en) * 1985-05-04 1986-11-05 Stc Plc Loudspeaking telephone
US4980908A (en) * 1989-05-30 1990-12-25 Voicetek Corporation Voice-switched gain control for voice communication equipment connected to telephone lines

Similar Documents

Publication Publication Date Title
MX9200088A (es) Sistema mejorado de distribucion de audio.
GB1387074A (en) Loudspeaking telephone sets
GB1423577A (en) Loudspeaking telephone station circuit
JPS56152395A (en) Ear microphone of simultaneous transmitting and receiving type
MY110481A (en) System for wireless transmitting and receiving a video
GB916545A (en) Improvements in or relating to loud speaking telephone sets
GB1504177A (en) Dictation system
GB967152A (en) Compandor
GB1232974A (enrdf_load_stackoverflow)
DK450987A (da) Kredsloebsforbindelse til at tilvejebringe isolation imellem et telefonapparts to transmissionsveje
MY134781A (en) A hand-free system
ES370417A1 (es) Un detector para generar una senal indicadora de recepcion de portadora.
JPS57208773A (en) Television receiver
FR2361025A1 (fr) Joncteur pour ligne telephonique alimentante fournissant le courant d'appel
GB604720A (en) Improvements in or relating to electrical signalling systems
KR900010828Y1 (ko) 전화통화시 오디오 신호 뮤팅회로
GB1207339A (en) Loud speaking telephone circuits
GB1047522A (en) Improvements in or relating to variable impedance electrical circuits
JPS5748870A (en) Original reader
JPH01202960A (ja) 自動受話音量調節機構付電話機
KR920014229A (ko) 하나의 자동이득조절회로를 갖는 tv수신용 if시스템
KR890001376A (ko) 무신호시 음성소거방법
GB1207340A (en) Loud speaking telephone circuits
KR830001579B1 (ko) 확성전화기의 2선식 동시통화장치
JPS59180552U (ja) 同時通話型送受話装置

Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees