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參數(shù)資料
| 型號： | QS7785 |
| 廠商： | Seiko NPC Corporation |
| 英文描述： | 3D 2/4-Channel Stereo Surround Synthesizer |
| 中文描述： | 三維環(huán)繞立體聲合成2/4-Channel |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 185K |
| 代理商： | QS7785 |
QS7785PF/CF
NIPPON PRECISION CIRCUITS—11
Center Control
The center signal output on COUT is enabled when
AC is HIGH.
This section describes the output function whereby
fixed frequency sound sources, such as vocal and
speech signals, can be output on the center signal. As
mentioned for “Type C” and “Type D” speaker
arrangements, the center signal can be output by
direct connection to a speaker or by adding the signal
to the front-channel output using a resistor connec-
tion between CIN and COUT.
Using a center speaker
When using a speaker, a capacitor Ca can be con-
nected between LPC and COUT, forming a lowpass
filter. The
3dB cutoff frequency of the filter is given
by the following equation.
Frequencies higher than voice tones are cut from the
signal sent to the center speaker for clear reproduc-
tion of voice-band signals.
Adding to the front-channel output
With this connection, the bass frequency components
can be removed from a signal. Capacitors Ca and Cb
and resistor Ra can be connected between CIN and
COUT to form a highpass filter. The
3dB cutoff fre-
quency of the filter is given by the following equa-
tion.
The input signal on CIN is added equally to both
front-channel outputs FLOUT and FROUT. Frequen-
cies lower than voice tones are cut from the signal
added to the front-channel outputs for clear repro-
duction of voice-band signals.
Note: Internal resistance value, R1 and R2, may vary ± 15%.
f
2
Ca
R1
×
-----------1
=
f
2
Cb Ra
R2
+
)
-----------------1
=
Center output connection
26
21
22
COUT
25
20
FROUT
CIN
FLOUT
LPC
10k
10k
10k
10k
R3:10k
Ca
R2:10k
Ra:10k
R1:20k
Front Right
Speaker
Cnter
Speaker
Front Left
Speaker
C
μ
F
Close when MUTE=H
Open when MUTE=L
Close when AC=H
Open when AC=L
V
REFOUT
Center output frequency response
6dB
G
C
3dB
f
L
f
H
3dB
Gain
Freq.
V(COUT)/V(RIN)@V(LIN)=0
V(FROUT)
or V(FLOUT)
f
L
=2
π
Cb(1
H
=
2
π
CaR1
)
6dB
1
G
C
=20 log
Ra+R2
R3
(
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PDF描述 |
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| QS7785CF | 3D 2/4-Channel Stereo Surround Synthesizer |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| QS7785CF | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:3D 2/4-Channel Stereo Surround Synthesizer |
| QS7785P/C | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:3D 2/4-Channel Stereo Surround Synthesizer |
| QS7785PF | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:3D 2/4-Channel Stereo Surround Synthesizer |
| QS78K | 制造商:Renesas Electronics Corporation 功能描述:CUBESUITE STANDARD LICENSE SEA |
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