JPS5787653A - Modulation and demodulation system for binary code transmission - Google Patents

Modulation and demodulation system for binary code transmission

Info

Publication number
JPS5787653A
JPS5787653A JP16435580A JP16435580A JPS5787653A JP S5787653 A JPS5787653 A JP S5787653A JP 16435580 A JP16435580 A JP 16435580A JP 16435580 A JP16435580 A JP 16435580A JP S5787653 A JPS5787653 A JP S5787653A
Authority
JP
Japan
Prior art keywords
operators
inputted
base band
sampling
carrier
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.)
Pending
Application number
JP16435580A
Other languages
Japanese (ja)
Inventor
Tsunehisa Sukai
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP16435580A priority Critical patent/JPS5787653A/en
Publication of JPS5787653A publication Critical patent/JPS5787653A/en
Pending 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
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits

Landscapes

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

Abstract

PURPOSE:To assure the tracking of phase variance of detected carrier waves, by making clear the deformation of characteristics between functions with different sampling rates and the state of generation of unnecessary waves, and compensating the delay in the sampling processing. CONSTITUTION:Information Kk is accumulated by using a memory R , and a complex modulating signal is obtained at the output. A component (ak) of a complex number modulating signal is inputted to operators A1, B2 and a component bk is inputted to operators B1, A2 respectively to compensate the deformation of transmission characteristics based on the difference of base band sampling speeds and the carrier band. A holding circuit H holds the compensated input signal and transmits a signal to operators G1, G2. The operators G1, G2 are filters which prevent the components based on the difference of the base band sampling and the carrier frequencies from being given to the base band, and the output is inputted to multipliers 1, 2 and a modulated carrier wave is outputted from an adder 3.
JP16435580A 1980-11-21 1980-11-21 Modulation and demodulation system for binary code transmission Pending JPS5787653A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16435580A JPS5787653A (en) 1980-11-21 1980-11-21 Modulation and demodulation system for binary code transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16435580A JPS5787653A (en) 1980-11-21 1980-11-21 Modulation and demodulation system for binary code transmission

Publications (1)

Publication Number Publication Date
JPS5787653A true JPS5787653A (en) 1982-06-01

Family

ID=15791569

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16435580A Pending JPS5787653A (en) 1980-11-21 1980-11-21 Modulation and demodulation system for binary code transmission

Country Status (1)

Country Link
JP (1) JPS5787653A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59224948A (en) * 1983-06-03 1984-12-17 Ricoh Co Ltd Digital modulator-demodulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59224948A (en) * 1983-06-03 1984-12-17 Ricoh Co Ltd Digital modulator-demodulator

Similar Documents

Publication Publication Date Title
US4943976A (en) Spread spectrum communication system
GB1210445A (en) Device for the transmission of synchronous pulse signals
GB1506352A (en) Digital detection system for differential phase shift keyed signals
DE69331667D1 (en) Multi-resolution transmission when using multi-carrier signals
FR2402975A1 (en) DATA SIGNAL TRANSMISSION SYSTEM USING A CARRIER WAVE WITH ANGULAR MODULATION AND CONSTANT AMPLITUDE
EP0772330A3 (en) Receiver and method for receiving OFDM signals
GB1534380A (en) Communications system
IE781725L (en) Radio communications
GB1534379A (en) Communications system
KR940003230A (en) Apparatus for Time Division Multiplexing Multiple Quadrature Amplitude Modulation (QAM) Signals
USRE38932E1 (en) Digital demodulator
US4477913A (en) Automatic equalizer apparatus
IE792125L (en) Clock rate recovery circuit
JPS5758448A (en) Forming circuit for residual side wave band
JPS5787653A (en) Modulation and demodulation system for binary code transmission
MY116925A (en) Apparatus for demodulating am data multiplexed modulated wave signal
JPS55147060A (en) Fsk and psk modulating circuit
JPS57162560A (en) Reproducing circuit of demodulating carrier wave
SU540344A1 (en) Phase Difference Modulation Signal Detector
SU570210A1 (en) Device for cycle synchronization
SU702533A1 (en) Device for compounding frequency range of speech and music
SU902302A1 (en) Digital information receiving device
JPS57104335A (en) Transmission system for residual side band
JPS57103455A (en) Receiving system eliminating disturbing wave
JPS57188151A (en) Am stereo signal transmission system