JPS5614758A - Frequency division system - Google Patents

Frequency division system

Info

Publication number
JPS5614758A
JPS5614758A JP9027879A JP9027879A JPS5614758A JP S5614758 A JPS5614758 A JP S5614758A JP 9027879 A JP9027879 A JP 9027879A JP 9027879 A JP9027879 A JP 9027879A JP S5614758 A JPS5614758 A JP S5614758A
Authority
JP
Japan
Prior art keywords
frequency
division
circuit
dividing circuit
dividing
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
JP9027879A
Other languages
Japanese (ja)
Inventor
Yuji Takada
Masaru Watanabe
Yuichi Miwa
Tetsuo Nojima
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 JP9027879A priority Critical patent/JPS5614758A/en
Publication of JPS5614758A publication Critical patent/JPS5614758A/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 facilitate LSI-implementation by digitizing the whole of processing while outputting many kinds of required frequencies by performing frequency division including a decimal by a frequency-division-ratio varying circuit, a kind of oscillator and frequency-dividing circuit. CONSTITUTION:A high-frequency clock signal from high-frequency oscillator 11 is applied to the 1st frequency-dividing circuit 21 of frequency-dividing circuit 21 that uses a presettable counter. To frequency-division-ratio varying circuit 13, a signal for control over the frequency-division ratio of frequency-division circuit 12 is input by changing modes such as input data and kinds of apparatues. This frequency-dividing circuit 12 is provided with the 2nd frequency-dividing circuit 22 consisting of the 1st frequency-dividing circuit 21 and frequency-dividing elements 22a-22c combined and a frequency-division ratio including a decimal, frequency- divided by frequency-dividing elements 22a-22c, is applied to circuit 13, the output of which is input as a preset input to frequency-dividing circuit 21. Many kinds of frequency-division values, frequency-divided by frequency-dividing circuit 21, are counted by counter 14, whose count value is converter by D/A converter 15 into an analog signal, which is passed through filter 16 to output many kinds of required frequencies.
JP9027879A 1979-07-18 1979-07-18 Frequency division system Pending JPS5614758A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9027879A JPS5614758A (en) 1979-07-18 1979-07-18 Frequency division system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9027879A JPS5614758A (en) 1979-07-18 1979-07-18 Frequency division system

Publications (1)

Publication Number Publication Date
JPS5614758A true JPS5614758A (en) 1981-02-13

Family

ID=13994043

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9027879A Pending JPS5614758A (en) 1979-07-18 1979-07-18 Frequency division system

Country Status (1)

Country Link
JP (1) JPS5614758A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61122523A (en) * 1984-11-20 1986-06-10 Tokico Ltd Measuring instrument of flow velocity and flow rate
JPH077529A (en) * 1992-12-22 1995-01-10 Hughes Aircraft Co Modulator with fractional sample / symbol time
US8593185B2 (en) 2010-07-01 2013-11-26 Fujitsu Semiconductor Limited Clock divider circuit and system LSI having same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61122523A (en) * 1984-11-20 1986-06-10 Tokico Ltd Measuring instrument of flow velocity and flow rate
JPH077529A (en) * 1992-12-22 1995-01-10 Hughes Aircraft Co Modulator with fractional sample / symbol time
US8593185B2 (en) 2010-07-01 2013-11-26 Fujitsu Semiconductor Limited Clock divider circuit and system LSI having same

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