CM102-A/102S データシートの表示（PDF） - C-Media Electronics

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CM102-A/102S

USB 2CH Audio Controller for Speaker

C-Media Electronics 

CM102-A+/102S+

USB Stereo Audio Chip for Speaker Integrated

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.

+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

- 14 -

B

Lower Levels Raised

Version: 1.01

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