BA7726 データシートの表示（PDF） - ROHM Semiconductor

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BA7726

Analog compander with vocal fader for KARAOKE

ROHM Semiconductor 

Multimedia ICs

BA7726AS / BA7726AFS

•Circuit operation

(1) MUTE CTRL (pin 4)

• Controls line muting.

VMUTE (4pin)

L

H

MUTE

MUTE

(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.

(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

VECHO (11pin)

VCC ~ 0.2 × VCC

0.1 × VCC ~ GND

MIC ON and ECHO LEVEL CTRL

MIC OFF

MIC AMP IN ~ LINE OUT

(VIN = – 38dBV, f = 1kHz)

0

VNOVC (31pin)

L

H

NORMAL

VOCAL CUT

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.

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

• Controls LINE OUT output in the NORMAL mode.

DLY BF IN ~ LINE OUT

(VIN = – 4dBV, f = 1kHz)

– 50

– 100

0

0.5

1.0

VECHO (11pin) P.P ratio : VECHO / VCC

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

partial pressure ratio

∗ These figures are for standard samples and

are not guaranteed standards.

L

LEFT

VLSTR (32pin)

M (OPEN)

STEREO

H

RIGHT

(4) LOOP GAIN CTRL (pin 12)

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

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

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

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

0

DLY BF IN ~ CMP BF OUT

(VIN = – 4dBV, f = 1kHz)

VCC = 9.0V

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

• Controls LINE OUT output in the VOCAL CUT mode.

VLVFR (3pin)

L

M (OPEN)

H

LEFT

VOCAL FADER

RIGHT

LEFT

: For recordings in which the left channel is karaoke

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

VOCAL FADER : Attenuates the vocals from normal stereo recordings.

RIGHT

: For recordings in which the right channel is karaoke

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

∗ When Vnovc = L, VLVFR = DON ' T CARE

When Vnovc = H, VLSTR = DON ' T CARE

8

– 25

– 50

0

0.5

1.0

VLOOP (12pin) P.P ratio : VECHO / VCC

Fig. 3 CMP BF OUT attenuation ratio vs. Vloop

(pin 12) partial pressure ratio

∗ These figures are for standard samples and

are not guaranteed standards.

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