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JPS5791058A - Digital modulator - Google Patents

Digital modulator

Info

Publication number
JPS5791058A
JPS5791058A JP16640880A JP16640880A JPS5791058A JP S5791058 A JPS5791058 A JP S5791058A JP 16640880 A JP16640880 A JP 16640880A JP 16640880 A JP16640880 A JP 16640880A JP S5791058 A JPS5791058 A JP S5791058A
Authority
JP
Japan
Prior art keywords
information
inputted
phase
synthesized
memory
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
JP16640880A
Other languages
Japanese (ja)
Other versions
JPH0128553B2 (en
Inventor
Hideo Suzuki
Shunsuke Yoda
Meiki Yahata
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP16640880A priority Critical patent/JPS5791058A/en
Publication of JPS5791058A publication Critical patent/JPS5791058A/en
Publication of JPH0128553B2 publication Critical patent/JPH0128553B2/ja
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
    • H04L27/18—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

PURPOSE:To remarkably reduce the number of multiplications and to reduce the scale of hardware, by using an impulse response waveform of a base band filter, in a modulator generating a phase modulation signal with a digital signal processing. CONSTITUTION:When a phase information to be transmitted is inputted to a terminal 20a and a phase rotation information of carrier wave is inputted to a terminal 20b, they are summed and a synthesized phase information is generated. This synthesized phase information is inputted to a triangle function memory 22, where conversion to sine and cosine is made. The triangle functions outputted from the memory 22 are picked up via signal memories 23, 23' storing a plurality of consecutive information, and convolution is made with the orthogonal impulse response waveform of an orthogonal pass band filter stored in a waveform memory 24 in advance. The result of convolution is synthesized and outputted as a phase modulation signal.
JP16640880A 1980-11-26 1980-11-26 Digital modulator Granted JPS5791058A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16640880A JPS5791058A (en) 1980-11-26 1980-11-26 Digital modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16640880A JPS5791058A (en) 1980-11-26 1980-11-26 Digital modulator

Publications (2)

Publication Number Publication Date
JPS5791058A true JPS5791058A (en) 1982-06-07
JPH0128553B2 JPH0128553B2 (en) 1989-06-02

Family

ID=15830861

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16640880A Granted JPS5791058A (en) 1980-11-26 1980-11-26 Digital modulator

Country Status (1)

Country Link
JP (1) JPS5791058A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6057732A (en) * 1983-09-08 1985-04-03 Ricoh Co Ltd Two/four wire converting system
JPH01105647A (en) * 1987-10-02 1989-04-24 Yokogawa Hewlett Packard Ltd Feeding device, preliminary modulation filter and modulating device for modulation signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6057732A (en) * 1983-09-08 1985-04-03 Ricoh Co Ltd Two/four wire converting system
JPH01105647A (en) * 1987-10-02 1989-04-24 Yokogawa Hewlett Packard Ltd Feeding device, preliminary modulation filter and modulating device for modulation signal

Also Published As

Publication number Publication date
JPH0128553B2 (en) 1989-06-02

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