ELECTRIC

MITSUBISHI

M65845AFP

PRELIMINARY

Notice

; This

is not

a final

specification.

some

parametric

limits

are

subject

to change.

MITSUBISHI SOUND PROCESSOR ICs

(

/ 15 )

DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT

Signal through frequency fsig is also determined by LPF of Digital Echo cut off frequency.

2 degree LPF of Digital Echo is formed by external resistance and capacitor .

(refer to next figure) So, cut off frequency is determined by next formula.

fsig=

1

2

π

R8 • R9 • C13 • C14

C14

C13

LPF1

LPF2

REF

24k

Ω

24k

Ω

24k

Ω

R7

R9

R8

13

C14

C13

REF

24k

Ω

24k

Ω

24k

Ω

R7

R9

R8

24

3 Input and output LPF

13

23

12