8

Multimedia ICs

BA7726AS / BA7726AFS

(1) MUTE CTRL (pin 4)

• Controls line muting.

2) L / ST / R CTRL (pin 32)

• Controls LINE OUT output in the NORMAL mode.

(2) OUTPUT CTRL (pins 3, 31, 32)

• LINE OUT output is controlled with pins 3, 31 and 32.

(Microphone mixing is controlled with pin 11.)

1) NO / VC CTRL (pin 31)

• Used to select the NORMAL and VOCAL CUT modes.

LH

MUTE

MUTE

LH

NORMAL

NORMAL

: Normal output mode. Controlled by pin 32.

VOCAL CUT : Used to erase or attenuate vocals in

multiplexed karaoke recordings and

normal stereo music recordings.

Controlled by pin3.

VOCAL CUT

L

M (OPEN)

H

LEFT

STEREO

RIGHT

RIGHT

: LINE IN R input is output to LINE OUT L / R.

STEREO : LINE IN L / R input is output to LINE OUT L / R without modification

LEFT

: LINE IN L input is output to LINE OUT L / R.

3) L / VF / R CTRL (pin 3)

• Controls LINE OUT output in the VOCAL CUT mode.

RIGHT

: For recordings in which the right channel is karaoke

and the left channel is for vocals (with karaoke).

LEFT

: For recordings in which the left channel is karaoke

and the right channel is for vocals (with karaoke).

L

M (OPEN)

H

LEFT

RIGHT

VOCAL FADER : Attenuates the vocals from normal stereo recordings.

VOCAL FADER

LVFR

= DON ' T CARE

(3) ECHO LEVEL CTRL and MIC ON / OFF SW (pin 11)

• Between Vcc and 0.2

× Vcc: Controls echo signal

mixing ratio

Between Vcc and GND : Turns microphone input

sound (pin 26) to LINE OUT on and off

0.1

MIC ON and ECHO LEVEL CTRL

MIC OFF

– 100

0

– 50

0

0.5

1.0

MIC AMP IN ~ LINE OUT

DLY BF IN ~ LINE OUT

Fig. 2 LINE OUTattenuation ratio vs. Vecho (11pin)

partial pressure ratio

are not guaranteed standards.

(4) LOOP GAIN CTRL (pin 12)

• Adjusts the loop gain (pins 17 and 18).

0

0

0.5

1.0

–50

–25

DLY BF IN

Fig. 3 CMP BF OUT attenuation ratio vs. Vloop

(pin 12) partial pressure ratio

are not guaranteed standards.