JPS55101870A - Frequency-to-digital converter - Google Patents

Frequency-to-digital converter

Info

Publication number
JPS55101870A
JPS55101870A JP982379A JP982379A JPS55101870A JP S55101870 A JPS55101870 A JP S55101870A JP 982379 A JP982379 A JP 982379A JP 982379 A JP982379 A JP 982379A JP S55101870 A JPS55101870 A JP S55101870A
Authority
JP
Japan
Prior art keywords
frequency
counter
counting
measured
value
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
JP982379A
Other languages
Japanese (ja)
Other versions
JPS5813865B2 (en
Inventor
Terukichi Hamabuchi
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.)
Toyo Electric Manufacturing Ltd
Original Assignee
Toyo Electric Manufacturing 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 Toyo Electric Manufacturing Ltd filed Critical Toyo Electric Manufacturing Ltd
Priority to JP982379A priority Critical patent/JPS5813865B2/en
Publication of JPS55101870A publication Critical patent/JPS55101870A/en
Publication of JPS5813865B2 publication Critical patent/JPS5813865B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Analogue/Digital Conversion (AREA)
  • Linear Or Angular Velocity Measurement And Their Indicating Devices (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)

Abstract

PURPOSE: To enable measurement of wide frequencies and improve the measuring accuracy of a frequency-to-digital converter by counting predetermined number of clocks in response to its frequency and reading a ROM written with calculated value in advance for the counted value.
CONSTITUTION: When measured pulse is applied to a counter 3, it counts the clock pulse through an oscillator 2 and a frequency divider 2 during the time from lapse of predetermined time to application of the measured pulse. Then, a ROM 4 written with counted value proportional to the square of the reciprocal number of the counted coutput is read in response to the counter value by the counter 3. Thus, the read value from the ROM 4 when completing the counting operation of the counter 3 is latched at a latch circuit 5, and the frequency is then measured. Accordingly, the counting capacity of the counter is expanded to square times in its frequency measuring range. In addition, the low frequency is divided, and is measured in high accuracy without ripple by counting the low frequency clocks.
COPYRIGHT: (C)1980,JPO&Japio
JP982379A 1979-01-30 1979-01-30 Frequency ↓-digital converter Expired JPS5813865B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP982379A JPS5813865B2 (en) 1979-01-30 1979-01-30 Frequency ↓-digital converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP982379A JPS5813865B2 (en) 1979-01-30 1979-01-30 Frequency ↓-digital converter

Publications (2)

Publication Number Publication Date
JPS55101870A true JPS55101870A (en) 1980-08-04
JPS5813865B2 JPS5813865B2 (en) 1983-03-16

Family

ID=11730851

Family Applications (1)

Application Number Title Priority Date Filing Date
JP982379A Expired JPS5813865B2 (en) 1979-01-30 1979-01-30 Frequency ↓-digital converter

Country Status (1)

Country Link
JP (1) JPS5813865B2 (en)

Also Published As

Publication number Publication date
JPS5813865B2 (en) 1983-03-16

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