M65845FP 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M65845FP

DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT

MITSUBISHI ELECTRIC  

M65845AFP PRELIMINARY Nsootmicee

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DIGITAL ECHO WITH

MITSUBISHI SOUND PROCESSOR

MICROPHONE MIXING CIRCUIT

ICs

Input impedance to 35 pin is so high (1MΩ) that ALC base voltage can be determined

by division resistance.

Vcc

R17(51k)

35

R16

C33(0.01µ )

at Vcc=5V

ALC operation voltage (dBV) 35 pin control voltage VALC (V)

+3

0.50

0

1.09

-2

1.38

-4

1.61

-6

1.79

-8

1.94

-10

2.05

resistance R16 (Ω)

5.6k

15k

20k

24k

27k

33k

36k

(4) MIC SW

Input low level to 31 pin (MIC SW) ,then microphone and echo signal can be cut.

31 pin (MIC SW)

H or OPEN

L

MIC SW

ON

OFF

ECHO SIGNAL

OUTPUT

ON

MUTE

MITSUBISHI

ELECTRIC

( 9 / 15 )

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