CM102S+ C-Media Electronics, Inc., CM102S+ Datasheet - Page 14

• Manufacturer Part Number: CM102S+
• Description: USB 2CH Audio Controller for Speaker
• Manufacturer: C-Media Electronics, Inc.

Date: 09/25/2005
6.2 DYNAMIC RANGE CONTROL (DRC)
CM102-A+/102S+ include a new feature called Dynamic Range Control (DRC), and with a
default ON setting (Users can still turn it off within the Windows audio advance control
panel)
Dynamic range is defined as the difference, in decibels (dB), between the loudest and
quietest sounds in any particular piece of audio content. Classical music is a good example,
with ranges from piano (soft) to forte to FFF (for extremely loud). Movies also typically have
a wide dynamic range, which may cause you to have to turn the volume up and down as
scenes change. For example, when watching a movie at home, you may be forced to turn
up volume to hear the dialog in a quiet scene, and then quickly turn it down again during a
car chase scene that follows. In this way, there may be times in a home theater environment
when it would be useful to be able to control the dynamic range.
With Dynamic Range Control enabled, the full dynamic range (A) of the program is reduced
(B).
A
Peaks Clipped
+10dB
+20dB
-10dB
-20dB
-30dB
-40dB
-50dB
-60dB
hard to heard
Lower Levels
0dB
A
USB Stereo Audio Chip for Speaker Integrated
DRC
- 14 -
Lower Levels Raised
Peaks Reduced
B
Peaks Reduced
B
Lower Levels Raised
CM102-A+/102S+
Version: 1.01