GB624560A - Improvements in or relating to double-current audio-frequency telegraphic transmission systems - Google Patents

Improvements in or relating to double-current audio-frequency telegraphic transmission systems

Info

Publication number
GB624560A
GB624560A GB16957/45A GB1695745A GB624560A GB 624560 A GB624560 A GB 624560A GB 16957/45 A GB16957/45 A GB 16957/45A GB 1695745 A GB1695745 A GB 1695745A GB 624560 A GB624560 A GB 624560A
Authority
GB
United Kingdom
Prior art keywords
relay
demodulator
station
output
contacts
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
GB16957/45A
Other languages
English (en)
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.)
Alcatel Lucent SAS
Original Assignee
Compagnie Generale dElectricite SA
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 Compagnie Generale dElectricite SA filed Critical Compagnie Generale dElectricite SA
Publication of GB624560A publication Critical patent/GB624560A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2035—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using a single or unspecified number of carriers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)
GB16957/45A 1943-03-12 1945-07-03 Improvements in or relating to double-current audio-frequency telegraphic transmission systems Expired GB624560A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR624560X 1943-03-12

Publications (1)

Publication Number Publication Date
GB624560A true GB624560A (en) 1949-06-13

Family

ID=8987164

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16957/45A Expired GB624560A (en) 1943-03-12 1945-07-03 Improvements in or relating to double-current audio-frequency telegraphic transmission systems

Country Status (2)

Country Link
GB (1) GB624560A (forum.php)
NL (1) NL65311C (forum.php)

Also Published As

Publication number Publication date
NL65311C (forum.php)

Similar Documents

Publication Publication Date Title
GB579972A (en) Secrecy communication system
GB673805A (en) Improvements in or relating to electric signal communication systems
US3456191A (en) Level control system for a communication system of the type in which a pilot signal is cotransmitted with information signals between an initial station and a final station
US2797261A (en) Carrier telegraph receiver
US2463502A (en) Method and system of secret communication
US2154921A (en) Signaling system
US3071649A (en) Cipher system for pulse code modulation communication system
GB624560A (en) Improvements in or relating to double-current audio-frequency telegraphic transmission systems
GB952570A (en) Data transmission apparatus
US2605410A (en) Pulse-time discriminator
US2503727A (en) Means for providing emergency break-in operation in communication systems
GB775845A (en) Improvements in or relating to frequency or phase modulated signal transmission relay stations
US2707209A (en) Frequency shift receiver converters
US2215482A (en) Carrier wave telephony
US2644036A (en) Receiver for two-tone carrier systems
US2142218A (en) Radio signaling
GB747851A (en) Improvements in and relating to electrical signalling
US2414440A (en) Voice frequency ringer
JPS57116438A (en) Radio communication system
US899241A (en) Signaling system.
US1570755A (en) Radio ringing system
US2596977A (en) Ringing equipment
US2554847A (en) Telegraph mark-hold circuit
US2797313A (en) Radio communication by neutral frequency deviation
GB641352A (en) Improvements in or relating to teleprinter exchange systems and equipment therefor