User`s manual

15
AXIS Q7404 - Video & Audio settings
Audio Settings (Channel 1)
This section describes how to configure the basic audio settings for the video encoder. The audio functionality for each video
stream is enabled under Video & Audio > Video Stream > Audio.
Audio Channels
Audio mode - The available audio modes are:
• Half-duplex. Audio is transmitted in both directions between the video encoder and the client, but only in one direc-
tion at a time. You must actively transmit/receive audio using the Talk/Listen button available on the Live View page
(see AXIS Media Control toolbar, on page 8). In Push-To-Talk mode, click and hold the button to speak and release it
when finished speaking. In Toggle mode, click once to switch between speaking and listening.
Note: The Talk/Listen button mode is configured from the Audio tab in the AMC control panel (see AXIS Media
Control (AMC), on page 11).
• Simplex – Network Video Encoder speaker only. Audio is transmitted from the client to the AXIS Q7404 and played
by the speaker connected to the encoder. To send audio, the Talk and Microphone buttons in the AMC Toolbar must
both be enabled. Click either button to stop audio transmission.
• Simplex – Network Video Encoder microphone only. Audio captured by the microphone connected to the video
encoder is transmitted from the encoder to one or more clients.
Audio Input
An external microphone or a line source can be connected to the Audio in connector on the video encoder. Set Source to
Microphone or Line depending on the connected device.
The Enable microphone power option provides DC power for an external microphone. If using a small electret condenser
microphone such as a clip-on microphone or a PC microphone, enable this option.
Note:
To use a high impedance dynamic microphone, do not enable microphone power. Microphone power will not harm the
microphone; if you are uncertain, try switching it off and on. To use a professional microphone requiring 48V phantom
power, you need an external power supply and a balanced-unbalanced converter (audio transformer) in between.
If the sound input is too low or too high, adjust the input gain for the microphone attached to the video encoder.
Select the desired audio Encoding format: AAC, G.711 μ-law or G.726.
Select the required Sample rate (number of times per second the sound is sampled). The higher the sample rate, the better the
audio quality and the greater the bandwidth required.
Changing the Bit rate changes the audio compression level and hence audio quality. A higher bit rate can improve audio
quality but requires more bandwidth.