User manual

16
AXIS Q7404 - Video & Audio settings
• 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.
The video encoder can be configured to trigger an event if the sound level rises above, falls below, or passes the set alarm
level.
Audio Output
If the sound from the speaker is too low or too high, adjust the output gain for the active speaker attached to the video
encoder.
When satisfied with the settings, click Save, or click Reset to revert to previously saved settings.
Note:
To receive synchronized audio and video in H.264, it is recommended that the time settings the video encoder and
client computer are synchronized with an NTP server. This is enabled in the video encoder under System Options >
Date & Time. Please refer to the help pages for more information.
Audio Clips
Audio clips can be played when an event occurs or manually from the Live View page. Audio clips are created either by
recording sound using a microphone or by uploading a sound file to the encoder. Audio clips that have been added to the Axis
product are listed in the Audio Clip List page. You can add new clips, play, download, modify and remove clips. Refer to the
online help for further information.