MY111359A - An apparatus for detecting frequency of an input signal - Google Patents

An apparatus for detecting frequency of an input signal

Info

Publication number
MY111359A
MY111359A MYUI93001757A MYUI19931757A MY111359A MY 111359 A MY111359 A MY 111359A MY UI93001757 A MYUI93001757 A MY UI93001757A MY UI19931757 A MYUI19931757 A MY UI19931757A MY 111359 A MY111359 A MY 111359A
Authority
MY
Malaysia
Prior art keywords
input signal
pulses
signal
frequency
reference signal
Prior art date
Application number
MYUI93001757A
Inventor
Chiang Yung Fu Fan
Kun Ming Lee
Original Assignee
Acer Peripherals Inc
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 Acer Peripherals Inc filed Critical Acer Peripherals Inc
Priority to MYUI93001757A priority Critical patent/MY111359A/en
Publication of MY111359A publication Critical patent/MY111359A/en

Links

Landscapes

  • Measuring Frequencies, Analyzing Spectra (AREA)

Abstract

AN APPARATUS FOR DETECTING FREQUENCY OF AN INPUT SIGNAL BY COUNTING THE PULSES OF A REFERENCE SIGNAL WITH A PREDETERMINED FREQUENCY WITHIN ONE CYCLE OF THE INPUT SIGNAL IS DISCLOSED. THE APPARATUS INCLUDES A FIRST AND A SECOND LATCH FOR LATCHING THE NUMBER OF PULSES OF THE REFERENCE SIGNAL FOR TWO CONSECUTIVE PERIODS OF THE INPUT SIGNAL. IN RESPONSE TO THE REFERENCE SIGNAL, A COMPARATOR IS USED TO COMPARE THE OUTPUT VALUE OF THE FIRST AND THE SECOND LATCH. WHEN THEY ARE DIFFERENT, A FLIP - FLOP GENERATES AN INTERRUPT SIGNAL TO A MICROPROCESSOR. THE MICROPROCESSOR READS THE UPDATE NUMBER OF PULSES AND GENERATES AN UPDATE FREQUENCY VALUE BASED NUMBER OF PULSES AND THE PREDETERMINED FREQUENCY OF THE REFERANCE SIGNAL. @@@(FIG. 1)
MYUI93001757A 1993-09-01 1993-09-01 An apparatus for detecting frequency of an input signal MY111359A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
MYUI93001757A MY111359A (en) 1993-09-01 1993-09-01 An apparatus for detecting frequency of an input signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
MYUI93001757A MY111359A (en) 1993-09-01 1993-09-01 An apparatus for detecting frequency of an input signal

Publications (1)

Publication Number Publication Date
MY111359A true MY111359A (en) 1999-11-30

Family

ID=81607406

Family Applications (1)

Application Number Title Priority Date Filing Date
MYUI93001757A MY111359A (en) 1993-09-01 1993-09-01 An apparatus for detecting frequency of an input signal

Country Status (1)

Country Link
MY (1) MY111359A (en)

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