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BA7726 Fiches technique(PDF) 8 Page - Rohm

No de pièce BA7726
Description  Analog compander with vocal fader for KARAOKE
Download  11 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
Logo ROHM - Rohm

BA7726 Fiches technique(HTML) 8 Page - Rohm

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Multimedia ICs
BA7726AS / BA7726AFS
Circuit operation
(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
VMUTE (4pin)
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
VNOVC (31pin)
VLSTR (32pin)
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).
VLVFR (3pin)
L
M (OPEN)
H
LEFT
RIGHT
VOCAL FADER : Attenuates the vocals from normal stereo recordings.
VOCAL FADER
When Vnovc = L, V
LVFR
= DON ' T CARE
When Vnovc = H, VLSTR = 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
VCC ~ 0.2
× VCC
0.1
× VCC ~ GND
VECHO (11pin)
MIC ON and ECHO LEVEL CTRL
MIC OFF
– 100
0
– 50
0
0.5
1.0
VECHO (11pin) P.P ratio : VECHO / VCC
MIC AMP IN ~ LINE OUT
(VIN = – 38dBV, f = 1kHz)
DLY BF IN ~ LINE OUT
(VIN = – 4dBV, f = 1kHz)
Fig. 2 LINE OUTattenuation ratio vs. Vecho (11pin)
partial pressure ratio
These figures are for standard samples and
are not guaranteed standards.
(4) LOOP GAIN CTRL (pin 12)
• Adjusts the loop gain (pins 17 and 18).
0
0
0.5
1.0
VCC = 9.0V
–50
–25
VLOOP (12pin) P.P ratio : VECHO / VCC
DLY BF IN
~ CMP BF OUT
(VIN = – 4dBV, f = 1kHz)
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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