JPS5548665A - Direction detecting method for sound source - Google Patents

Direction detecting method for sound source

Info

Publication number
JPS5548665A
JPS5548665A JP12175978A JP12175978A JPS5548665A JP S5548665 A JPS5548665 A JP S5548665A JP 12175978 A JP12175978 A JP 12175978A JP 12175978 A JP12175978 A JP 12175978A JP S5548665 A JPS5548665 A JP S5548665A
Authority
JP
Japan
Prior art keywords
sound source
wave
demodulated
phase
frequency signal
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
JP12175978A
Other languages
Japanese (ja)
Inventor
Toshio Koda
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.)
National Institute of Advanced Industrial Science and Technology AIST
Original Assignee
Agency of Industrial Science and Technology
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 Agency of Industrial Science and Technology filed Critical Agency of Industrial Science and Technology
Priority to JP12175978A priority Critical patent/JPS5548665A/en
Publication of JPS5548665A publication Critical patent/JPS5548665A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/80—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves
    • G01S3/802—Systems for determining direction or deviation from predetermined direction
    • G01S3/808—Systems for determining direction or deviation from predetermined direction using transducers spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

PURPOSE:To increase greatly the detectable range for the sound source by giving a comparison between the low frequency signal obtained through demodulation and the phase of the demodulated wave featuring the same form as the low frequency signal. CONSTITUTION:The FM wave received the frequency modulation is sent out to the ultrasonic wave from sound source 1. The FM wave is received at two receivers 2 and 2 and then demodulated via FM demodulators 3 and 3, thus the demodulated wave being drawn out. This demodulated wave features the same form as the low frequency signal. And the phase is compared among these demodulated waves at phase comparator 4. Based on the phase difference, sound source 1 gives comparison to the phase of the detected demodulated wave featuring the same form as the low frequency signal. Thus distance difference S can be increased between the sound source and the two receivers. As a result, the detectable range can be increased greatly for the sound source.
JP12175978A 1978-10-03 1978-10-03 Direction detecting method for sound source Pending JPS5548665A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12175978A JPS5548665A (en) 1978-10-03 1978-10-03 Direction detecting method for sound source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12175978A JPS5548665A (en) 1978-10-03 1978-10-03 Direction detecting method for sound source

Publications (1)

Publication Number Publication Date
JPS5548665A true JPS5548665A (en) 1980-04-07

Family

ID=14819175

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12175978A Pending JPS5548665A (en) 1978-10-03 1978-10-03 Direction detecting method for sound source

Country Status (1)

Country Link
JP (1) JPS5548665A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6095832A (en) * 1983-10-28 1985-05-29 Toshiba Corp Production of bulb
JPS61218968A (en) * 1985-03-25 1986-09-29 Matsushita Electric Works Ltd Ultrasonic wave azimuth sensor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4884664A (en) * 1972-02-10 1973-11-10

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4884664A (en) * 1972-02-10 1973-11-10

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6095832A (en) * 1983-10-28 1985-05-29 Toshiba Corp Production of bulb
JPS61218968A (en) * 1985-03-25 1986-09-29 Matsushita Electric Works Ltd Ultrasonic wave azimuth sensor

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