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參數(shù)資料
| 型號： | BA7725 |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | Analog compander for KARAOKE echo systems |
| 中文描述： | 卡拉OK擴展器模擬回聲系統(tǒng) |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 94K |
| 代理商： | BA7725 |
7
Multimedia ICs
BA7725S / BA7725FS
10
5
– 100
– 50
0
Secondary echo
Sound source
Primary echo
0
A
TT
(dB)
V
4
= 9.0V
LOOP GAIN CTRL pin voltage (V)
Line output attenuation vs.
loop gain control pin voltage
L
T
Fig.7
0
– 50
– 100
0
5
10
Primary echo
Sound source
A
TT
(dB)
ECHO LEVEL CTRL pin voltage : (V)
Line output attenuation vs.
echo level control pin voltage
L
Fig.6
(2) LINE IN / LINE OUT gain
Line amplifier gain is fixed at +18dB.
+
+
+
+
+12dB
Fig.5
2
1
21
22
MIC AMP IN
R9
R10
SW
LINE OUT
LINE IN
After being amplified by the internal microphone amplifier, the audio signal is log-
arithmically compressed by 1 / 2 then input to the tertiary low pass filter, which
comprises an internal BF and attached capacitor and resistor.
(3) Echo level control
The DC voltage supplied to pin 4 (BA7725S) or pin 3 (BA7725FS) determines
when the microphone switch is turned on and off and controls the echo level.
Line input and level-controlled microphone input are mixed and output.
Mode
Threshold voltage
Operation
L (1.0V Max.)
Only line audio is output.
MIC OFF
H (2.0V Min.)
MIC ON
Microphone switch control
Echo level control
Attenuation of the primary echo signals from sound
source can be controlled by changing the DC voltage
impressed on pin 4 (BA7725S) or pin 3 (BA7725FS)
between 2V and 9V.
Attenuation of primary echo signals can be controlled
by changing the DC voltage impressed on pin 6
(BA7725S) or pin 5 (BA7725FS) .
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BA7725FS | 制造商:ROHM 制造商全稱:Rohm 功能描述:Analog compander for KARAOKE echo systems |
| BA7725S | 制造商:ROHM 制造商全稱:Rohm 功能描述:Analog compander for KARAOKE echo systems |
| BA7725S/FS | 制造商:ROHM 制造商全稱:Rohm 功能描述:Multimedia LSIs |
| BA7726 | 制造商:ROHM 制造商全稱:Rohm 功能描述:Analog compander with vocal fader for KARAOKE |
| BA7726AFS | 制造商:ROHM 制造商全稱:Rohm 功能描述:Analog compander with vocal fader for KARAOKE |
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