BU9414FV Datasheet, PDF (37/61 Pages) Rohm – 32bit Audio DSP

BU9414FV
Technical Note
4-17. 2 Band dynamic range compression
Like the explosion in TV commercials or a movie, it is the function to control volume automatically and to adjust volume so
that a televiewer may not be surprised, when sound becomes large suddenly.
Compression operation is performed about each two band of low-pass and a high region.
Moreover, the high region builds in LPF for preventing the incorrect reaction to the pilot signal of an image.
Input
Max
Output
A_RATE
R_RATE
min
BASS and MIDDLE frequency
component is extracted.
LPF1
IN
DET
OUT
MIDDLE and TREBLE frequency
component is extracted.
DET
LPF2
ON/OFF low frequency DRC .
Default = 0
Select Address
&h18 [ 7 ]
Value
0
1
Operational explanation
Use low frequency DRC
Not use low frequency DRC
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
37/57
2012.03 - Rev.A