M61510AFP

Rev.1.00, Aug.07.2003, page 15 of 22

(4) Vocal cut equivalent circuit diagram

This IC incorporates a circuit which uses a tone control midrange circuit to lower the midrange gain, to easily realize a

vocal cut function.

However, when the vocal cut function is on, the tone control midrange cannot be used.

Vocal cut switch

R1

C2

C1

IN

OUT

0dB

+10dB

100

1k

10k

Frequency f (Hz)

<Characteristic curves>

-30dB

-20dB

-10dB

External resistances: The frequency characteristics when vocal cut is on

can be set as shown below through the constants R1, C1, and C2.

Vocal cut switch

When vocal cut is on: switch off

When vocal cut is off: switch on

f0=550Hz

Gv=-30dB

550

R2

R3

R2+R3=200k

Ω

20log

R2+R3

R1

+2

2

(dB)

2

π R1(R2+R3)C1C2

1

(Hz)

Gv =

0dB

+10dB

100

1k

10k

Frequency f (Hz)

-30dB

-20dB

-10dB

f0=530Hz

Gv=-20dB

550

R=3k

Ω C1=C2=0.012µF

1. Emphasis on vocal cut characteristic

R=10k

Ω, C1=C2=6800pF

2. Emphasis on tone control mid characteristic

Tone midrange waveform

when vocal cut is off

Vocal cut waveform

when vocal cut is on

Tone midrange waveform

when vocal cut is off

Vocal cut waveform

when vocal cut is on

8dB setting

8dB setting