FR2262883A1 - Numerical HF modulation and demodulation device - uses pulses spaced by half the transmission period - Google Patents

Numerical HF modulation and demodulation device - uses pulses spaced by half the transmission period

Info

Publication number
FR2262883A1
FR2262883A1 FR7407063A FR7407063A FR2262883A1 FR 2262883 A1 FR2262883 A1 FR 2262883A1 FR 7407063 A FR7407063 A FR 7407063A FR 7407063 A FR7407063 A FR 7407063A FR 2262883 A1 FR2262883 A1 FR 2262883A1
Authority
FR
France
Prior art keywords
modulation
numerical
transmission period
demodulation device
amplitude
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.)
Granted
Application number
FR7407063A
Other languages
English (en)
French (fr)
Other versions
FR2262883B1 (https=
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.)
Thales SA
Original Assignee
Thomson CSF 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 Thomson CSF SA filed Critical Thomson CSF SA
Priority to FR7407063A priority Critical patent/FR2262883A1/fr
Publication of FR2262883A1 publication Critical patent/FR2262883A1/fr
Application granted granted Critical
Publication of FR2262883B1 publication Critical patent/FR2262883B1/fr
Granted 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
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3494—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems using non - square modulating pulses, e.g. using raised cosine pulses; Partial response QAM, i.e. with partial response pulse shaping
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers
    • H04L27/3827—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers in which the carrier is recovered using only the demodulated baseband signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
FR7407063A 1974-03-01 1974-03-01 Numerical HF modulation and demodulation device - uses pulses spaced by half the transmission period Granted FR2262883A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7407063A FR2262883A1 (en) 1974-03-01 1974-03-01 Numerical HF modulation and demodulation device - uses pulses spaced by half the transmission period

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7407063A FR2262883A1 (en) 1974-03-01 1974-03-01 Numerical HF modulation and demodulation device - uses pulses spaced by half the transmission period

Publications (2)

Publication Number Publication Date
FR2262883A1 true FR2262883A1 (en) 1975-09-26
FR2262883B1 FR2262883B1 (https=) 1977-09-16

Family

ID=9135681

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7407063A Granted FR2262883A1 (en) 1974-03-01 1974-03-01 Numerical HF modulation and demodulation device - uses pulses spaced by half the transmission period

Country Status (1)

Country Link
FR (1) FR2262883A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2472876A1 (fr) * 1979-12-31 1981-07-03 Bic Jean Claude Modulateur-demodulateur pour transmission en double modulation d'amplitude a quatre niveaux sur porteuses en quadrature

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2472876A1 (fr) * 1979-12-31 1981-07-03 Bic Jean Claude Modulateur-demodulateur pour transmission en double modulation d'amplitude a quatre niveaux sur porteuses en quadrature
EP0031762A3 (en) * 1979-12-31 1981-07-29 Jean-Claude Bic Modulator-demodulator for transmission by a four-level double amplitude modulation on quadrature carriers

Also Published As

Publication number Publication date
FR2262883B1 (https=) 1977-09-16

Similar Documents

Publication Publication Date Title
US4247942A (en) Jam resistant communication system
GB1079928A (en) A data transmission system
SE9901238D0 (sv) Dual-mode radiotelephone apparatus for digital or analog modulation
JPS6466582A (en) System for detecting propagation time of transmission line
EP0151334A3 (en) Direct conversion frequency modulation radio receiver
GB1304188A (https=)
ES425145A1 (es) Un metodo para convertir una senal de datos en codigo bina-rio en otra senal en codigo de dos impulsos con la misma po-laridad y otros dos con polaridad opuesta por cada bit.
GB1533678A (en) Fsk transmitter having frequency band-limitation
CA2080786A1 (en) Vector fm modulator
FR2262883A1 (en) Numerical HF modulation and demodulation device - uses pulses spaced by half the transmission period
GB1367585A (en) Data receiving apparatus
GB1519574A (en) Quadraphse modulator
GB1515711A (en) Band compression technique for data communication
GB1193475A (en) Improvements in or relating to Coded Information Transmission Systems
GB1173607A (en) Methods of Multiplexing Sampled Data and Apparatus Therefor.
GB1392546A (en) Binary data communication apparatus
GB1148805A (en) Binary code signals transmission system
EP0325459A3 (en) Digital modulator
GB1205658A (en) Frequency multiplex differential phase modulation signal receiver
GB1281169A (en) Improvements in or relating to phase modulation transmission systems
JPS5915429B2 (ja) 受信装置
SU1713113A1 (ru) Амплитудный модул тор
GB1026161A (en) Improvements in or relating to frequency-shift digital transmission systems
GB1519972A (en) Data transmission system
FR2249509A1 (en) Frequency modulation and differential phase demodulation system - provides signal with zero spectrum at zero frequency

Legal Events

Date Code Title Description
CL Concession to grant licenses
ST Notification of lapse