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M65854FP

DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT

MITSUBISHI ELECTRIC  

MITSUBISHI SOUND PROCESSOR ICs

M65854FP

50S E R I E S

KARAOKE

DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT

(5)ALC level diagram

Vo(dBV)

10

+2

0

-10

-20

-30

ALC OPERATING VOLTAGE SETTING RANGE

MICROPHONE AMPLIFIER GAIN SETTIG=47dB

-70 -60 -50 -40 -30 -20 -10

Vi(dBV)

(6) Input and output LPF for the digital echo

The input and output LPF for the digital echo are configured as shown.

figure below.

C2:1000pF

C1:4700pF

13

14

15

24k

24k

24k

Input

Output

The accuracy of the internal resistance of the IC is approximately ±30%

Cut-off frequency(fc) is given as follows.

fc=

1

2π X 24k X

1

=

C1 X C2

2π X 24k

X 4700pF X 1000pF

3.1KHz

Quality factor (Q) is given by the following equation for long echo.

Q=13

C1

C2

0.72 (Figure of 0.7 is recommended)

MITSUBISHI

ELECTRIC

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