Vista VIP Kit2 VK2-ENCODER Manuel d'utilisateur télécharger pdf (Page 52)

VK2-2MPBX User manual V1.2

- G.711, also known as Pulse Code Modulation (PCM), is a very commonly used waveform codec.

G.711 uses a sampling rate of 8,000 samples per second, with the tolerance on that rate 50 parts

per million (ppm). Non-uniform quantization (logarithmic) with 8 bits is used to represent each

sample, resulting in a 64 kbit/s bit rate.

- There are two slightly different versions; μ-law, which is used primarily in North America, and A-

law, which is in use in most other countries outside North America. G.711 μ -law tends to give more

resolution to higher range signals while G.711 A-law provides more quantization levels at lower

signal levels.

Audio Input: Adjusts the audio volume especially from the Mike.

Input volume: The Input volume can be adjusted in the range from -21.00 to 21.00 dB. The

default setting is 0 dB. Click the Mute box if you do not want the audio input.

Audio Output: Adjusts the audio volume especially to the Speaker.

Output volume: The Output volume can be adjusted in the range from -18.1 to 6.0 dB. The

default setting is 0 dB. Click the Mute box if you do not want the audio output.

- Click the Save button to save the settings, or click the Reset button to clear all of the information

you entered without saving it.

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Vista VIP Kit2 VK2-ENCODER Manuel d'utilisateur Page 52