JPS5547456A - Detecting device for frequency of fundamental wave - Google Patents

Detecting device for frequency of fundamental wave

Info

Publication number
JPS5547456A
JPS5547456A JP12078878A JP12078878A JPS5547456A JP S5547456 A JPS5547456 A JP S5547456A JP 12078878 A JP12078878 A JP 12078878A JP 12078878 A JP12078878 A JP 12078878A JP S5547456 A JPS5547456 A JP S5547456A
Authority
JP
Japan
Prior art keywords
frequency
circuit
signal
octave
output
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
JP12078878A
Other languages
Japanese (ja)
Inventor
Motoi Yagi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP12078878A priority Critical patent/JPS5547456A/en
Publication of JPS5547456A publication Critical patent/JPS5547456A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measuring Frequencies, Analyzing Spectra (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

PURPOSE: To find the frequency of fundamental wave from the signal that contains many higher harmonics by detecting the peak of periodic input signal wave form to obtain a pulse signal corresponding to the fundamental period of input signal, by discriminating the frequency band of signal and by sample-holding it.
CONSTITUTION: The signal to be detected, which contains many higher harmonics, is fed to the peak value detecting circuit 1 to detect the peak value. Its output is provided to the octave separating circuit 3 as a hand discriminator through the shaping circuit 2. The output of octave separating circuit is fed to the frequency detecting circuits 4aW4n to detect the frequency of fundamental wave of input signal. Each of the frequency detecting circuits 4aW4n consists of a sampling hold circuit 32 that sample-holds the output of octave separating circuit, filter circuit 33, rectifier circuit 34 and light emission diodes 39W42. The light emission diode corresponding to the frequency band to which the fundamental frequency belongs is lighted.
COPYRIGHT: (C)1980,JPO&Japio
JP12078878A 1978-09-30 1978-09-30 Detecting device for frequency of fundamental wave Pending JPS5547456A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12078878A JPS5547456A (en) 1978-09-30 1978-09-30 Detecting device for frequency of fundamental wave

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12078878A JPS5547456A (en) 1978-09-30 1978-09-30 Detecting device for frequency of fundamental wave

Publications (1)

Publication Number Publication Date
JPS5547456A true JPS5547456A (en) 1980-04-03

Family

ID=14795005

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12078878A Pending JPS5547456A (en) 1978-09-30 1978-09-30 Detecting device for frequency of fundamental wave

Country Status (1)

Country Link
JP (1) JPS5547456A (en)

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