PolyOS Audio Subsystem

The PolyOS audio subsystem interfaces with the Android OS as a mic input and a speaker output.

Poly video conferencing devices include many microphone configurations to provide excellent sound coverage for large conference rooms. The sophisticated audio processing includes, but isn’t limited, to the following features:

• Noise reduction
• Automatic gain control
• Echo cancellation
• Source speaker location

Depending on your selected hardware, audio processing includes optional selection of microphones and line in/out processing.

After the audio input processing subsystem has conditioned and eco-cancelled the audio input, the final signal is presented to the application layer as an Android built-in mic.

Content audio input via the HDMI input is available to the application as an HDMI type device.

Use the Android media system API to read and write audio data, and use the PolyOS API for mute control and other advanced audio features.

The supported sample rates are 8KHz, 16 KHz, 32 KHz, and 48 KHz.