CM103+ C-Media Electronics, Inc., CM103+ Datasheet - Page 18

• Manufacturer Part Number: CM103+
• Description: 16-Bit Stereo USB Audio Controller
• Manufacturer: C-Media Electronics, Inc.

Date: 09/25/2005
CM103+ 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).
6.4 DYNAMIC RANGE CONTROL (DRC)
A
Peaks Clipped
+20dB
+10dB
-10dB
-20dB
-30dB
-40dB
-50dB
-60dB
hard to heard
Lower Levels
0dB
USB Stereo Audio Chip for Digital Speakers Application
A
DRC
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Lower Levels Raised
Peaks Reduced
B
Peaks Reduced
B
Lower Levels Raised
Version: 1.01
CM103+