GB1368069A - Digital communications systems - Google Patents

Digital communications systems

Info

Publication number
GB1368069A
GB1368069A GB2188173A GB2188173A GB1368069A GB 1368069 A GB1368069 A GB 1368069A GB 2188173 A GB2188173 A GB 2188173A GB 2188173 A GB2188173 A GB 2188173A GB 1368069 A GB1368069 A GB 1368069A
Authority
GB
United Kingdom
Prior art keywords
oct
communications systems
digital communications
digital
isochranous
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
GB2188173A
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.)
Post Office
Original Assignee
Post Office
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
Priority claimed from GB4881771A external-priority patent/GB1368068A/en
Application filed by Post Office filed Critical Post Office
Priority to GB2188173A priority Critical patent/GB1368069A/en
Publication of GB1368069A publication Critical patent/GB1368069A/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
    • H04L27/2053—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 more than one carrier, e.g. carriers with different phases
    • H04L27/206—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 more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
    • H04L27/2067—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 more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
    • H04L27/2071—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 more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the data are represented by the carrier phase, e.g. systems with differential coding

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

1368069 Digital diphase transmission POST OFFICE 19 Oct 1972 [20 Oct 1971] 21881/73 Divided out of 1368068 Addition to 1368068 Heading H4P The disclosure is identical to the parent Specification 1,368,068, but the claims are directed to the use of a mod-2 adder 2 for summing an isochranous baseband data signal and a square wave carrier signal having a period equal to bit rate, and a 90 degree phase advance.
GB2188173A 1971-10-20 1972-10-19 Digital communications systems Expired GB1368069A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2188173A GB1368069A (en) 1971-10-20 1972-10-19 Digital communications systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4881771A GB1368068A (en) 1971-10-20 1971-10-20 Digital communication systems
GB2188173A GB1368069A (en) 1971-10-20 1972-10-19 Digital communications systems

Publications (1)

Publication Number Publication Date
GB1368069A true GB1368069A (en) 1974-09-25

Family

ID=26255586

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2188173A Expired GB1368069A (en) 1971-10-20 1972-10-19 Digital communications systems

Country Status (1)

Country Link
GB (1) GB1368069A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0005735A1 (en) * 1978-05-26 1979-12-12 Robert Bosch Gmbh Phase modulation circuit
GB2209908A (en) * 1987-09-15 1989-05-24 Plessey Co Plc A bi-phase modulator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0005735A1 (en) * 1978-05-26 1979-12-12 Robert Bosch Gmbh Phase modulation circuit
GB2209908A (en) * 1987-09-15 1989-05-24 Plessey Co Plc A bi-phase modulator

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)