Toshiba NB505 ユーザーズマニュアル

User’s Manual

3-29

NB500/NB505/NB520/NB525/NB550D/NB555D Series

This function is supported with some models.
Dolby Advanced Audio provides a stunning listening experience from any 

pair of speakers or headphones. Adding a new level of realism to movies, 

music, and games, this is the quality audio customers have been missing 

from your computers.
Dolby Advanced Audio includes:

■

High-Frequency Enhancer: Analyzes and restores high frequencies lost 

during encoding. Works on any speaker for a higher level of audio than 

was previously possible.

■

Audio Optimization: Corrects common audio problems caused by 

laptop limitations for a better entertainment experience.

■

Natural Bass: Extends the bass response of any speakers by up to an 

octave.

■

Dolby Headphone: Enables personal surround sound using any set of 

headphones.

To access Dolby Advanced Audio function, follow the steps as detailed 

below:
1. Right-click on the speaker icon on the Taskbar, and select Playback 

devices from the sub menu.

2. Select Speakers, and click Properties.
3. Click the Dolby tab.

You can use the built-in or an external microphone that connects to the 

microphone jack to record monaural sounds into your applications. It can 

also be used to issue voice commands to applications that support such 

functions (built-in microphone is provided with some models).
Since your computer has a microphone and speaker, "feedback" may be 

heard under certain conditions. Feedback occurs when sound from the 

speaker is picked up in the microphone and amplified back to the speaker, 

which amplifies it again to the microphone.
This feedback occurs repeatedly and causes a very loud, high-pitched 

noise. It is a common phenomenon that occurs in any sound system when 

the microphone input is output to the speaker (throughput) and the speaker 

volume is too loud or too close to the microphone. You can control 

throughput by adjusting the volume of your speaker or through the Mute 

function in the Master Volume panel. Refer to your Windows documentation 

for details on using the Master Volume panel.