JPS55166333A - Digital phase modulator - Google Patents

Digital phase modulator

Info

Publication number
JPS55166333A
JPS55166333A JP7412879A JP7412879A JPS55166333A JP S55166333 A JPS55166333 A JP S55166333A JP 7412879 A JP7412879 A JP 7412879A JP 7412879 A JP7412879 A JP 7412879A JP S55166333 A JPS55166333 A JP S55166333A
Authority
JP
Japan
Prior art keywords
circuit
value
output
converting
supplied
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
JP7412879A
Other languages
Japanese (ja)
Other versions
JPH0226403B2 (en
Inventor
Yoshihiko Akaiwa
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP7412879A priority Critical patent/JPS55166333A/en
Publication of JPS55166333A publication Critical patent/JPS55166333A/en
Publication of JPH0226403B2 publication Critical patent/JPH0226403B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/02—Digital function generators
    • G06F1/03—Digital function generators working, at least partly, by table look-up
    • G06F1/0321—Waveform generators, i.e. devices for generating periodical functions of time, e.g. direct digital synthesizers
    • G06F1/0328—Waveform generators, i.e. devices for generating periodical functions of time, e.g. direct digital synthesizers in which the phase increment is adjustable, e.g. by using an adder-accumulator
    • G06F1/0335—Waveform generators, i.e. devices for generating periodical functions of time, e.g. direct digital synthesizers in which the phase increment is adjustable, e.g. by using an adder-accumulator the phase increment itself being a composed function of two or more variables, e.g. frequency and phase

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To obtain the satisfactory characteristics even in case the converting speed of the A/D converting circuit is low, by installing the interpolation circuit which assumes the value at the time excepting the moment when the input analog signal is sampled to the output side of the A/D converting circuit. CONSTITUTION:The modulated analog signal is converted into the digital value via A/D converting circuit 2 and then supplied to adder circuit 3 via interpolation circuit 12. On the other hand, the output of circuit 5 which sets the fixed value is added by add-up circuit 4 which gives addition with every clock cycle supplied from terminal 10, and then supplied to circuit 3. The output of circuit 3 is applied to memory circuit 6 to obtain the sampled phase modulation wave, and this output is converted into the analog quantity via D/A modulating circuit 7 to become the continuous signals in terms of the time by LPF8. Here the velocity of circuit 2 is slower than circuit 7 to cause the discountinuous phase modulation. To compensate this, the value is assumed at the time excepting the sampling point by circuit 12 and by means of the value at each sampling point.
JP7412879A 1979-06-12 1979-06-12 Digital phase modulator Granted JPS55166333A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7412879A JPS55166333A (en) 1979-06-12 1979-06-12 Digital phase modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7412879A JPS55166333A (en) 1979-06-12 1979-06-12 Digital phase modulator

Publications (2)

Publication Number Publication Date
JPS55166333A true JPS55166333A (en) 1980-12-25
JPH0226403B2 JPH0226403B2 (en) 1990-06-11

Family

ID=13538239

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7412879A Granted JPS55166333A (en) 1979-06-12 1979-06-12 Digital phase modulator

Country Status (1)

Country Link
JP (1) JPS55166333A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4584541A (en) * 1984-12-28 1986-04-22 Rca Corporation Digital modulator with variations of phase and amplitude modulation
US4628286A (en) * 1985-04-17 1986-12-09 Rca Corporation Digital frequency modulator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5243308A (en) * 1975-10-01 1977-04-05 Fujitsu Ltd Signal transmitting system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5243308A (en) * 1975-10-01 1977-04-05 Fujitsu Ltd Signal transmitting system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4584541A (en) * 1984-12-28 1986-04-22 Rca Corporation Digital modulator with variations of phase and amplitude modulation
US4628286A (en) * 1985-04-17 1986-12-09 Rca Corporation Digital frequency modulator

Also Published As

Publication number Publication date
JPH0226403B2 (en) 1990-06-11

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