JPS5772409A - Varying device for frequency characteristic of electronic apparatus - Google Patents

Varying device for frequency characteristic of electronic apparatus

Info

Publication number
JPS5772409A
JPS5772409A JP14855480A JP14855480A JPS5772409A JP S5772409 A JPS5772409 A JP S5772409A JP 14855480 A JP14855480 A JP 14855480A JP 14855480 A JP14855480 A JP 14855480A JP S5772409 A JPS5772409 A JP S5772409A
Authority
JP
Japan
Prior art keywords
band
frequency
microphone
voice
pass filter
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
JP14855480A
Other languages
Japanese (ja)
Inventor
Teruo Ichikawa
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP14855480A priority Critical patent/JPS5772409A/en
Publication of JPS5772409A publication Critical patent/JPS5772409A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/18—Automatic control in untuned amplifiers

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To improve the level for recognition of voice, by charging the frequency characteristics of an electronic apparatus in accordance with the magnitude of a noise having a frequency unnecessary for conversation. CONSTITUTION:Signal components except the voice band are extracted from sounds picked up by a microphone by a filter, and a control voltage Vc corresponding to them is obtained. Meanwhile, the output of the microphone is given to an amplifier OA through a band-pass filter 28. The input of the band-pass filter 28 is so constituted that the output of the microphone is divided by a resistance R1, an FET Q1 operated as a variable resistance, and an LC resonance circuit. If the noise is high, the resistance value of the FET Q1 is controlled to a high value, and as a result, the Q value of the LC resonance circuit is raised, and the characteristics of the band-pass filter 28 has a peak. If the peak frequency is set near the center of the voice frequency band, the articulation is improved, and thus, the apparatus is applied to a hearing aid and a telephone.
JP14855480A 1980-10-22 1980-10-22 Varying device for frequency characteristic of electronic apparatus Pending JPS5772409A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14855480A JPS5772409A (en) 1980-10-22 1980-10-22 Varying device for frequency characteristic of electronic apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14855480A JPS5772409A (en) 1980-10-22 1980-10-22 Varying device for frequency characteristic of electronic apparatus

Publications (1)

Publication Number Publication Date
JPS5772409A true JPS5772409A (en) 1982-05-06

Family

ID=15455348

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14855480A Pending JPS5772409A (en) 1980-10-22 1980-10-22 Varying device for frequency characteristic of electronic apparatus

Country Status (1)

Country Link
JP (1) JPS5772409A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5323457A (en) * 1991-01-18 1994-06-21 Nec Corporation Circuit for suppressing white noise in received voice

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5323457A (en) * 1991-01-18 1994-06-21 Nec Corporation Circuit for suppressing white noise in received voice

Similar Documents

Publication Publication Date Title
KR850007551A (en) Hearing aid
US4322579A (en) Sound reproduction in a space with an independent sound source
Lyon Automatic gain control in cochlear mechanics
BR9607270A (en) Hearing aid
JPS56134807A (en) Acoustic reproducing device
JPS54160150A (en) Frequency selecting circuit
JPS5772409A (en) Varying device for frequency characteristic of electronic apparatus
JPS5642413A (en) Sound-field singla correcting device
EP0636242A1 (en) Apparatus and method for voice band reduction
JPS5720088A (en) Amplifier for microphone
JPS5775014A (en) Correcting device for sound volume of electronic apparatus
DE3333776A1 (en) METHOD AND DEVICE FOR TRANSMITTING ACOUSTIC INFORMATION AS A FEELABLE VIBRATION
JPS6230080Y2 (en)
GB1537320A (en) Single control power-frequency control circuit
JPS57101404A (en) Compensation circuit for nonlinear distortion
Ambikairajah et al. An adaptive cochlear model for speech recognition.
RU23045U1 (en) Hearing Aid with Discrete Amplitude-Frequency Corrector (OPTIONS)
DK164345B (en) ACTIVE TONE CONTROL FOR HEARING DEVICE
SU824486A1 (en) Hearing aid
JPS57104312A (en) Control device for sound volume of acoustic device
JPS56132009A (en) Tone control device
SU1757083A1 (en) Audio frequency amplifier with volume and timbre control
Goodman et al. Sidetone expansion for the regulation of talker loudness
JPS54152414A (en) Squelch system of fm mobile radio equipment
JPS5541054A (en) Speaker cable