QAUDIO
Quectel modules’ audio interface has main and auxiliary channels. Audio interface can be designed for the applications of handset, headset, loud speaker and etc. Quectel can provide customers with the reference design of the prepherial circuit and ways of decreasing TTD noise, suppressing Echo and sidetone. Quectel also can offer customers special Echo suppression and AGC algorithm to improve the audio performance.
The Quectel module for hands-free applications can be opened at the same time echo cancellation algorithm, the maximum extent weakened echo, while maintaining good communication effect. In addition, the automatic gain controller on the MIC transmission path can effectively suppress the broken sound, and the noise cancellation controller on the SPK receiving path can effectively reduce the environmental noise and bring comfort. The utility model can be widely used on the vehicle equipment.
Source: http://www.quectel.com/technology/qaudio.htm