JPS5612190A - Preamplifier - Google Patents

Preamplifier

Info

Publication number
JPS5612190A
JPS5612190A JP8782279A JP8782279A JPS5612190A JP S5612190 A JPS5612190 A JP S5612190A JP 8782279 A JP8782279 A JP 8782279A JP 8782279 A JP8782279 A JP 8782279A JP S5612190 A JPS5612190 A JP S5612190A
Authority
JP
Japan
Prior art keywords
polarization
voltage
calibration
resistor
capacitor microphone
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
JP8782279A
Other languages
Japanese (ja)
Inventor
Takashi Ogiwara
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 JP8782279A priority Critical patent/JPS5612190A/en
Publication of JPS5612190A publication Critical patent/JPS5612190A/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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/04—Microphones

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

PURPOSE:To make it possible to adjust the polarization voltage of a capacitor microphone accurately without destroying an amplifying circuit by providing a polarization voltage supervisory resistor and polarization voltage supervisory terminal. CONSTITUTION:A calibration signal, supplied from the calibration system of a sound-pressure calibrator to calibration input terminal 8, is supplied to output terminal 7 by way of calibration output terminal 2, capacitor microphone 12, input terminal 1, coupling capacitor 5 and amplifying circuit 6. In comparison with the output voltage of DC polarization electric power source 3, the polarization voltage of capacitor microphone 12 falls slightly because of the relation between the insulating resistance of capacitor microphone 12 and coupling capacitor 5, and polarization resistor 4 and consequently, it is measured through polarization-voltage supervisory resistor 10 to adjust the output voltage of DC polarization power source 3 to a normal polarization voltage.
JP8782279A 1979-07-11 1979-07-11 Preamplifier Pending JPS5612190A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8782279A JPS5612190A (en) 1979-07-11 1979-07-11 Preamplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8782279A JPS5612190A (en) 1979-07-11 1979-07-11 Preamplifier

Publications (1)

Publication Number Publication Date
JPS5612190A true JPS5612190A (en) 1981-02-06

Family

ID=13925642

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8782279A Pending JPS5612190A (en) 1979-07-11 1979-07-11 Preamplifier

Country Status (1)

Country Link
JP (1) JPS5612190A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61244771A (en) * 1985-04-17 1986-10-31 ザ・コカ・コ−ラ・カンパニ− Package from which carbonated beverage pre-mix is distributed
JPS6278093A (en) * 1985-09-18 1987-04-10 ザ・コカ−コ−ラ・カンパニ− Method and system of filling package with carbonated beverage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61244771A (en) * 1985-04-17 1986-10-31 ザ・コカ・コ−ラ・カンパニ− Package from which carbonated beverage pre-mix is distributed
JPS6278093A (en) * 1985-09-18 1987-04-10 ザ・コカ−コ−ラ・カンパニ− Method and system of filling package with carbonated beverage

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