The TAx511x and TAx521x devices are a family of high performance stereo codecs suitable for Land Mobile Radio, IP Network and Telephone, Video Conferencing, and Professional Audio Equipment. This family of devices has an extensive set of features that include the following:

• Real-Time DSP-based digital mixer
• Digital volume control
• Programmable filters (Biquads, HPF)
• Automatic gain control (AGC)/ Dynamic range compression (DRC)
• Linear-phase or Low-latency filter modes
• Ultrasound activity Detection/generator
• Voice activity detection (VAD)

This application note describes how to configure the Voice Activity Detection (VAD) feature in TAx511x and TAx521x devices (TAA5111, TAA5112, TAC5111, TAC5112, TAA5211, TAA5212, TAC5211, TAC5212).