# Audio overview
The audio subsystem powered by low power AI (LPAI) delivers voice UI and
audio experiences. It uses a dedicated hardware-based AI accelerator for
machine learning-based work.
Audio component overview
The audio system includes:
- **Application processor** – CPU that handles audio processing tasks.
Tasks include:
- Managing audio record and playback
- Decoding audio formats
- Using LPAI for postprocessing tasks
- **Low Power AI (LPAI)** – Subsystem that runs audio playback/record and voice-activation (VA) algorithms.
It integrates with a dedicated Qualcomm® Hexagon™ Processor (QDSP6) and a low power island (LPI).
- **Audio codec** – Hardware that includes:
- Analog-to-Digital Converter (ADC)
- Digital-to-Analog Converter (DAC)
These convert analog audio to digital, and vice versa.
- **Speaker AMP and microphone** – Devices that connect over I2S/TDM/SoundWire.
## Architecture
The following figure shows the high-level audio software architecture.
High-level audio software architecture
The following are the major audio software architecture components:
[PulseAudio](https://docs.qualcomm.com/doc/80-70020-16/topic/enable-audio.html#enable-pulseaudio)
A sound server for POSIX OSes (mostly targeting Linux) that acts as a
proxy and router between hardware device drivers and applications on
one or many hosts.
[Platform Abstration Layer (PAL)](https://docs.qualcomm.com/doc/80-70020-16/topic/pal.html#pal)
Provides higher-level audio-specific APIs to access the audio
hardware and drivers to enable audio features.
[Audio Graph Manager (AGM)](https://docs.qualcomm.com/doc/80-70020-16/topic/agm.html#agm)
Provides interfaces to allow TinyALSA-based mixer controls and
PCM/compressed plug-ins to interact and enable audio features.
[AudioReach Graph Service (ARGS)](https://docs.qualcomm.com/doc/80-70020-16/topic/agm.html#args)
Consists of the Graph Service Layer (GSL), Generic Packet Router (GPR),
and acdb Management Layer (AML) modules. Handles initialization and
creation of graphs, and creation of packets for sending a series of
commands to the signal processing framework (SPF).
[Audio calibration database (acdb)](https://docs.qualcomm.com/doc/80-70020-16/topic/agm.html#section-rhd-fg4-zbc)
Includes information about various audio use cases such as
graphs, module calibration data, etc. The APPS processor parses acdb
files to get the graph information used by SPF to
enable the use case.
[Signal Processing Framework (SPF)](https://docs.qualcomm.com/doc/80-70020-16/topic/agm.html#spf-sw)
Modular framework that runs on the LPAI DSP. It helps
set up, configure, and run signal processing modules for audio features.
[Qualcomm Audio Calibration Tool (QACT™ Platform)](https://docs.qualcomm.com/bundle/resource/topics/80-70020-16A/tools.html)
PC-based software that provides a GUI to
visualize, configure, and store audio graphs in the acdb for
audio use cases.
Last Published: Jan 07, 2026
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