M65851FP

REJ03F0172-0201 Rev.2.01 Jan 25, 2008

Page 13 of 27

Equalizer Block

Following is the equalizer block, which can control the both gain bass and treble.

–

+

+

–

EQIN

R2

136 k

C1

0.022

μ

Bass resonance block

Treble block

(56)

(57)

(58)

71

70

69

(63)

64

C2

0.47

μ

R1

1.8 k

EQSW1

EQSW2

(59)

68

(62)

EQSW3

EQSW4

EQOUT

C3

0.033

μ

65

Bass block is resonance type which is used simulated inductor amplifier. Treble block is filter type. These can be set

–12 dB to +12 dB/2 dB step.

(Hz)

1

2

π C1 • C2 • R1 • R2

Q = (C1

• R2) / (C2 • R1)

Vocal Cut Block

The sound components of the same phase and same sound volume in the L and R channels are attenuated.

This made also allows components with lower frequency than the vocal band to pass through the filter, to compensate

insufficient low-frequency sound.

Constitution

Lch input

+

–

Vocal cut

output

20 k

–

+

20 k

20 k

Rch input

20 k

20 k

20 k

R

20 k 76

C

0.15

μ

LPF is formed by the internal R (20 k

Ω) and the external C, when C = 0.15 μF, cut off frequency is 53 Hz.

= 53.0 Hz

1

2

π CR