Stream settings

This is a Mono/Stereo 2D scale that allows you to adjust the attributes of the sound, switch stream modes between Mono and Stereo, and select the stream Sample Rate. In the Autonomous mode, you can move this pointer to change the attributes.

Fig 01 - Stream settings or the Mono/Stereo scale [Main panel]

Mono (monaural) means only one sound channel, while Stereo includes two independent channels. Since the speech engine reproduces only one voice, selecting Mono allows saving some CPU resources without decreasing the quality of the sound.

Sample Rate determines the overall bandwidth (i.e. how many frequencies can be encoded within the audio signal), with higher sampling rates yielding a wider bandwidth. Higher sample rates produce higher quality audio at the expense of higher CPU utilization. Frequencies of about 1/2 the sample rate can be produced effectively, so to reproduce a frequency of 10 kHz, a sample rate of at least 20 kHz must be chosen.

8000 Hz

AM radio quality

11025 Hz

Reasonable compromise quality

16000 Hz

Reasonable compromise quality

22050 Hz

FM radio quality

32000 Hz

Better than FM radio quality (for some sound cards, this value is 32075 Hz)  

44100 Hz

CD quality

48000 Hz

DVD quality

In the Intercept mode, AV VCSG will display the attributes of the audio stream intercepted. For example, Internet audio programs normally use the Mono and 8000 Hz (or 11025 Hz) values, and these values will be displayed if you intercept such a program.

See also: