Audio circuit design and parameter guide for Quectel M1x, M95, and M80 GSM modules.
This guide provides reference designs and parameter settings for audio circuits in Quectel M1x, M95, and M80 modules. It covers microphone, receiver, headset, and speaker reference circuits, TDD noise solutions, layout suggestions, and component details. It also includes AT commands for audio channel configuration and echo suppression parameters.
The document includes safety information for using the modules in various environments, such as while driving, in aircraft, or near medical equipment. It also explains hardware configurations for each module and how to modify audio parameters using AT commands to resolve echo and noise issues.
| Audio Channels | M1x and M95: 2 hardware channels; M80: 3 software-defined channels |
|---|---|
| Maximum Power Output | 800mW at channel AOUT3 for M80 |
Use AT+QAUDCH to read and set the software audio channel.
The M80 module has a built-in class AB amplifier at channel AOUT3 with a maximum power of 800mW.