CM103 View Datasheet(PDF) - C-Media Electronics

Part Name

Description

Manufacturer

CM103

16-Bit Stereo USB Audio Controller

C-Media Electronics 

CM103+

USB Stereo Audio Chip for Digital Speakers Application

6.4 DYNAMIC RANGE CONTROL (DRC)

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.

+20dB

+10dB

0dB

-10dB

-20dB

-30dB

-40dB

A

-50dB

-60dB

Peaks Reduced

B

Lower Levels Raised

With Dynamic Range Control enabled, the full dynamic range (A) of the program is

reduced (B).

Peaks Clipped

Peaks Reduced

DRC

Lower Levels

hard to heard

A

Date: 09/25/2005

- 18 -

B

Lower Levels Raised

Version: 1.01

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