JPS5568794A - Hearing aid - Google Patents

Hearing aid

Info

Publication number
JPS5568794A
JPS5568794A JP14299378A JP14299378A JPS5568794A JP S5568794 A JPS5568794 A JP S5568794A JP 14299378 A JP14299378 A JP 14299378A JP 14299378 A JP14299378 A JP 14299378A JP S5568794 A JPS5568794 A JP S5568794A
Authority
JP
Japan
Prior art keywords
output
amplifier
circuit
comparator
muting
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
JP14299378A
Other languages
Japanese (ja)
Inventor
Kenji Aoki
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.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
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 Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP14299378A priority Critical patent/JPS5568794A/en
Publication of JPS5568794A publication Critical patent/JPS5568794A/en
Pending legal-status Critical Current

Links

Landscapes

  • Circuit For Audible Band Transducer (AREA)

Abstract

PURPOSE: To secure an automatic control for the muting operation level according to the external environment by giving the muting to the output amplifier with the mean level of the input voice used as the threshold level, thus increasing the practical use properties.
CONSTITUTION: The input voice is applied to comparator 208 and BPF210 via sense amplifier 207, and the output of NPF210 is delivered through rectifying/ smoothing circuit 211 in the form of the mean level of the input to be supplied to comparator 208 via delay circuit 213 and bias circuit 214. And the output is obtained through comparator 208 when the output of amplifier 207 is larger than the output of bias circuit 214, and the output is applied to time constant circuit 209. On the other hand, circuit 209 features a low level when the output of amplifier 207 is small, and thus the muting is given to output amplifier 205 via diode 212.
COPYRIGHT: (C)1980,JPO&Japio
JP14299378A 1978-11-20 1978-11-20 Hearing aid Pending JPS5568794A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14299378A JPS5568794A (en) 1978-11-20 1978-11-20 Hearing aid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14299378A JPS5568794A (en) 1978-11-20 1978-11-20 Hearing aid

Publications (1)

Publication Number Publication Date
JPS5568794A true JPS5568794A (en) 1980-05-23

Family

ID=15328438

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14299378A Pending JPS5568794A (en) 1978-11-20 1978-11-20 Hearing aid

Country Status (1)

Country Link
JP (1) JPS5568794A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5846710A (en) * 1981-09-14 1983-03-18 Rion Co Ltd hearing aid
JPH05504448A (en) * 1989-11-03 1993-07-08 エティモティック　リサーチ　インコーポレイテッド High fidelity hearing aid amplifier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5846710A (en) * 1981-09-14 1983-03-18 Rion Co Ltd hearing aid
JPH05504448A (en) * 1989-11-03 1993-07-08 エティモティック　リサーチ　インコーポレイテッド High fidelity hearing aid amplifier

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