JPS5757100A - Microphne device - Google Patents

Microphne device

Info

Publication number
JPS5757100A
JPS5757100A JP13319680A JP13319680A JPS5757100A JP S5757100 A JPS5757100 A JP S5757100A JP 13319680 A JP13319680 A JP 13319680A JP 13319680 A JP13319680 A JP 13319680A JP S5757100 A JPS5757100 A JP S5757100A
Authority
JP
Japan
Prior art keywords
output
microphone
differential amplifier
components
amplified
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
JP13319680A
Other languages
Japanese (ja)
Inventor
Yutaka Kotani
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.)
Canon Inc
Original Assignee
Canon 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 Canon Inc filed Critical Canon Inc
Priority to JP13319680A priority Critical patent/JPS5757100A/en
Publication of JPS5757100A publication Critical patent/JPS5757100A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones

Abstract

PURPOSE:To cancel the noise output due to a vibration sound, by directing two unidirectional microphones to directions opposite to each other and causing the output of one microphone to pass through a low pass filter and performing subtraction between this output and the output of the other microphone. CONSTITUTION:Microphones 7 and 8 directed to the front and the back respectively are arranged adjacently. Resultant signals between the object sound and the noise sound picked up by them are applied to preamplifiers 9 and 10 and are amplified. The output of the amplifier 10 has middle and high components attenuated by a low pass filter 11, and only low frequency components are inputted to an inversion terminal (-) of a differential amplifier 12. The output of microphone 7 is amplified and is applied to a noninversion input (+) of the differential amplifier 12, and signal components due to the low frequency vibration transferred from a camera main body through a holder part have phases opposite to each other, and a signal where these signal components are cancelled by each other is outputted to the output of the differential amplifier 12.
JP13319680A 1980-09-24 1980-09-24 Microphne device Pending JPS5757100A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13319680A JPS5757100A (en) 1980-09-24 1980-09-24 Microphne device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13319680A JPS5757100A (en) 1980-09-24 1980-09-24 Microphne device

Publications (1)

Publication Number Publication Date
JPS5757100A true JPS5757100A (en) 1982-04-06

Family

ID=15098953

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13319680A Pending JPS5757100A (en) 1980-09-24 1980-09-24 Microphne device

Country Status (1)

Country Link
JP (1) JPS5757100A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58176002A (en) * 1982-04-07 1983-10-15 Ishikawajima Harima Heavy Ind Co Ltd Method and device for rolling
US4622440A (en) * 1984-04-11 1986-11-11 In Tech Systems Corp. Differential hearing aid with programmable frequency response

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5394918A (en) * 1977-01-28 1978-08-19 Masahisa Ikegami Combtned mtcrophone

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5394918A (en) * 1977-01-28 1978-08-19 Masahisa Ikegami Combtned mtcrophone

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58176002A (en) * 1982-04-07 1983-10-15 Ishikawajima Harima Heavy Ind Co Ltd Method and device for rolling
JPH0310402B2 (en) * 1982-04-07 1991-02-13 Ishikawajima Harima Heavy Ind
US4622440A (en) * 1984-04-11 1986-11-11 In Tech Systems Corp. Differential hearing aid with programmable frequency response

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