JPS5436772A - Tone detector - Google Patents

Tone detector

Info

Publication number
JPS5436772A
JPS5436772A JP10293177A JP10293177A JPS5436772A JP S5436772 A JPS5436772 A JP S5436772A JP 10293177 A JP10293177 A JP 10293177A JP 10293177 A JP10293177 A JP 10293177A JP S5436772 A JPS5436772 A JP S5436772A
Authority
JP
Japan
Prior art keywords
tone
tone detector
decepler
judging
existence
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
JP10293177A
Other languages
Japanese (ja)
Inventor
Yutaka Okumura
Yoshiji Furuya
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP10293177A priority Critical patent/JPS5436772A/en
Publication of JPS5436772A publication Critical patent/JPS5436772A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

PURPOSE: To improve the power consumption and size of an echo preventing tone decepler by judging the existence of a tone to be detected in accordance with the results of both means for modulating input signals to judge the level and means for measuring the period.
COPYRIGHT: (C)1979,JPO&Japio
JP10293177A 1977-08-26 1977-08-26 Tone detector Pending JPS5436772A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10293177A JPS5436772A (en) 1977-08-26 1977-08-26 Tone detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10293177A JPS5436772A (en) 1977-08-26 1977-08-26 Tone detector

Publications (1)

Publication Number Publication Date
JPS5436772A true JPS5436772A (en) 1979-03-17

Family

ID=14340577

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10293177A Pending JPS5436772A (en) 1977-08-26 1977-08-26 Tone detector

Country Status (1)

Country Link
JP (1) JPS5436772A (en)

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