Overview
AVP Transmitters in both 2G and 3G systems have up to 3 audio inputs: HDMI, Line-In, Mic-In. The analog audio input ports can be embedded onto the HDMI signal, transmitted across the network to a Receiver, and played on the Receiver. This leaves the possibility for the 3 audio signals to be combined if all 3 signals are active and enabled. These audio inputs can be independently turned on and off, and their default status is different depending on the version of firmware. Use this article to enable or disable the audio inputs so that audio is working the way it is needed.
Compatible Models
The following Just Add Power devices have analog mic- and line-input ports:
- 418AVP - 2G+AVP Transmitter
- 718AVP - 3G+AVP Transmitter
- 749AVP - 3G+AVP Rackmount Transmitter
Situation 1: No Analog Audio on TX and RX
The Mic-Input and Line-Input ports are not enabled by default. Enabling the ports must be done manually:
| Function | Command | Description |
|---|---|---|
| Enable Mic-In | dd_mic_on.sh | Enables the Mic-In port |
| Disable Mic-In (default) |
dd_mic_mute.sh | Disables the Mic-In port |
| Enable Line-In | dd_line_on.sh | Enables the Line-In port |
| Disable Line-In (default) |
dd_line_mute.sh | Disables the Line-In port |
| Enable HDMI Audio (default) |
dd_main_on.sh | Enables the audio signal coming from the HDMI source |
| Disable HDMI Audio | dd_main_mute.sh | Disables the audio signal coming from the HDMI source |
Situation 2: Analog Audio on TX, No Analog Audio on RX
Once the Mic-Input and Line-Input ports are enabled, audio will play out of the Stereo port on the Transmitter. If the audio signal is not playing on Receiver - through either HDMI or the Stereo port - that means the HDMI signal does not have audio and the audio driver has been disabled on the Transmitter.
To enable the audio driver on the Transmitter all the time - regardless of if there is HDMI audio or not - send this command to the Transmitter:
astparam s v_rx_drv_option 6;astparam save;sleep 1;reboot
The Transmitter will reboot once the command is applied. WARNING: This setting will cause the Transmitter to always output a signal. Do NOT run JADConfig with this setting applied on a Transmitter.
If using 2G devices - or 3G devices in 2G Mode - the audio driver on the Receiver also needs to be enabled. Send this command to the Receiver:
astparam s a_force_dual_output y;astparam save;sleep 1;reboot
The Receiver will reboot once the command is applied.
