Qualcomm Voice Assist provides always-on keyword detection for enabled voice assistants on your device.

It is always-on, low power, and functions even when your device's screen is off.
From version Qualcomm Voice Assist 3.1.28:
Support for Android 11
Bug fixes and performance enhancements
Variant
Arch
Version
DPI
(Android 8.1+)
Latest: 3.1.28 on September 25, 2020
All versions
September 25, 2020