Audio

EC-Orin NX has two audio outputs and one audio input.

Audio Output

Users can output audio through the headphone jack and HDMI port.

Interface Switching

Switch between the headphone and HDMI interfaces in the system settings, selecting one for output:

Command Line Mode

In the terminal, execute the command:

# cat /proc/asound/cards
 0 [HDA            ]: tegra-hda - NVIDIA Jetson Orin Nano HDA
                      NVIDIA Jetson Orin Nano HDA at 0x3518000 irq 120
 1 [APE            ]: tegra-ape - NVIDIA Jetson Orin Nano APE
                      NVIDIA-NVIDIAJetsonOrinNanoDeveloperKit-NotSpecified-Jetson

• HDA represents the HDMI sound card, device number 3

• APE represents the headphone sound card, device number 0

• HDMI

  aplay -D hw:HDA,3 hdmi.wav # where hdmi.wav needs to be a stereo format file
  

• Headphones

  amixer -c APE cset name="I2S2 Mux" ADMAIF1
  aplay -D hw:APE,0 test.wav
  

Audio Input

Using the APE sound card, connect the headphones to start recording, execute the command line:

amixer -c APE cset name="ADMAIF1 Mux" I2S2
arecord -D hw:APE,0 -c 2 -r 16000  -f S32_LE test.wav