JPS6474814A - Automatic varying circuit for receiving sound volume - Google Patents

Automatic varying circuit for receiving sound volume

Info

Publication number
JPS6474814A
JPS6474814A JP23279587A JP23279587A JPS6474814A JP S6474814 A JPS6474814 A JP S6474814A JP 23279587 A JP23279587 A JP 23279587A JP 23279587 A JP23279587 A JP 23279587A JP S6474814 A JPS6474814 A JP S6474814A
Authority
JP
Japan
Prior art keywords
noise
latched
data
signal
circuit
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
JP23279587A
Other languages
Japanese (ja)
Inventor
Saburou Shintake
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.)
Fujitsu General Ltd
Original Assignee
Fujitsu General 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 Fujitsu General Ltd filed Critical Fujitsu General Ltd
Priority to JP23279587A priority Critical patent/JPS6474814A/en
Publication of JPS6474814A publication Critical patent/JPS6474814A/en
Pending legal-status Critical Current

Links

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  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To automatically vary a receiving sound volume corresponding to a noise, by varying impedance at every prescribed time corresponding to the digital signal of a voice signal obtained by detecting a noise signal, and performing the level convertion of the voice signal. CONSTITUTION:When a wave of prescribed level is received, it is outputted as voice from a speaker 6. When an ambient noise is quite low, the noise signal is latched at a latch circuit 11 via a microphone 7, an amplifier circuit 8, a detection circuit 9, and an A/D conversion circuit 10. The latched signal is compared with data corresponding to the noise at every time set at a timer circuit 13 at a comparator 12, and as a result, larger data is issued. Then, the switching circuit of an electronic volume 4 performs the level conversion of a received voice signal by the maximum impedance by the latched data. when the ambient noise is increased, the data of the noise is compared 12 with the data latched previously, and the larger data is latched 11, then, the sound volume of output voice is increased by the electronic volume 4.
JP23279587A 1987-09-17 1987-09-17 Automatic varying circuit for receiving sound volume Pending JPS6474814A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23279587A JPS6474814A (en) 1987-09-17 1987-09-17 Automatic varying circuit for receiving sound volume

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23279587A JPS6474814A (en) 1987-09-17 1987-09-17 Automatic varying circuit for receiving sound volume

Publications (1)

Publication Number Publication Date
JPS6474814A true JPS6474814A (en) 1989-03-20

Family

ID=16944874

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23279587A Pending JPS6474814A (en) 1987-09-17 1987-09-17 Automatic varying circuit for receiving sound volume

Country Status (1)

Country Link
JP (1) JPS6474814A (en)

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