JPS5586250A - Carrier generator - Google Patents

Carrier generator

Info

Publication number
JPS5586250A
JPS5586250A JP16325978A JP16325978A JPS5586250A JP S5586250 A JPS5586250 A JP S5586250A JP 16325978 A JP16325978 A JP 16325978A JP 16325978 A JP16325978 A JP 16325978A JP S5586250 A JPS5586250 A JP S5586250A
Authority
JP
Japan
Prior art keywords
address
code bits
signal
accumulator
encoder
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
JP16325978A
Other languages
Japanese (ja)
Inventor
Kuninosuke Ihira
Keiji Kahara
Shigeyuki Umigami
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16325978A priority Critical patent/JPS5586250A/en
Publication of JPS5586250A publication Critical patent/JPS5586250A/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
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits
    • H04L27/122—Modulator circuits; Transmitter circuits using digital generation of carrier signals

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 realize a carrier frequency of a true value as to a random frequency by attaining access with address width made variable, by using ROM stored with sine- waveform data. CONSTITUTION:Address-width signal generator 2 generates an address width signal for generating a required carrier signal corresponding to modulated data from input terminal 1 and it is a cumulative value in accumulator 3. The address signal from accumulator 3 is subtracted by the same value by subtracters 4-7 in sequence, and code bits S1-S4, difference outputs, are inputted to encoder 11 to express positive code bits by ''0'' and negative ones by ''1''. Encoder 11, composed of ROM, converts them into three-bit codes C1-C3 corresponding to a combination of code bits and they are inputted to respective selectors 12-14. Here, since ROM15 uses only data corresponding to the 1/4 period of a sine wave, codes outputted by substracters are inverted into an address signal. Consequently, a carrier frequency of a true value can be obtained.
JP16325978A 1978-12-25 1978-12-25 Carrier generator Pending JPS5586250A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16325978A JPS5586250A (en) 1978-12-25 1978-12-25 Carrier generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16325978A JPS5586250A (en) 1978-12-25 1978-12-25 Carrier generator

Publications (1)

Publication Number Publication Date
JPS5586250A true JPS5586250A (en) 1980-06-28

Family

ID=15770391

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16325978A Pending JPS5586250A (en) 1978-12-25 1978-12-25 Carrier generator

Country Status (1)

Country Link
JP (1) JPS5586250A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5899085A (en) * 1981-12-08 1983-06-13 Sony Corp Black burst signal forming circuit
JPS59182602A (en) * 1983-03-31 1984-10-17 Shimadzu Corp Waveform generator
JPS59215102A (en) * 1983-05-20 1984-12-05 Nec Corp Variable oscillator of digital phase continuous frequency
JPS6096029A (en) * 1983-10-31 1985-05-29 Anritsu Corp Signal generator
JPH02162905A (en) * 1988-12-16 1990-06-22 Nippon Telegr & Teleph Corp <Ntt> Digital trigonometric function generator
JPH03294916A (en) * 1990-04-12 1991-12-26 Matsushita Electric Ind Co Ltd Periodic function generating circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4984712A (en) * 1972-11-29 1974-08-14
JPS50151050A (en) * 1974-04-29 1975-12-04

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4984712A (en) * 1972-11-29 1974-08-14
JPS50151050A (en) * 1974-04-29 1975-12-04

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5899085A (en) * 1981-12-08 1983-06-13 Sony Corp Black burst signal forming circuit
JPS59182602A (en) * 1983-03-31 1984-10-17 Shimadzu Corp Waveform generator
JPS59215102A (en) * 1983-05-20 1984-12-05 Nec Corp Variable oscillator of digital phase continuous frequency
JPS6096029A (en) * 1983-10-31 1985-05-29 Anritsu Corp Signal generator
JPH0454406B2 (en) * 1983-10-31 1992-08-31 Anritsu Corp
JPH02162905A (en) * 1988-12-16 1990-06-22 Nippon Telegr & Teleph Corp <Ntt> Digital trigonometric function generator
JPH03294916A (en) * 1990-04-12 1991-12-26 Matsushita Electric Ind Co Ltd Periodic function generating circuit

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