AEC (Echo Cancellation) 

Definition:

Acoustic the Echo Cancellation, the echo in the audio is canceled by the algorithm (such as the feedback formed by the second pick-up of the sound played by the speaker by the microphone), and the purity of the two-way call is realized.

Core principles:

The speaker output signal is analyzed to generate an "echo model", which is subtracted from the microphone input signal, preserving the original speech (e. g., the user's voice).

Typical applications: two-way interaction scenarios such as voice interruptions, intelligent voice assistants, and video conferencing.

Application cases:

smart speaker voice:When the speaker announces, the microphone picks up the speaker sound to form an echo, and AEC technology eliminates the echo in real time to ensure that user commands are not disturbed.

distance teaching system:When the teacher teaches through the microphone, the sound of the student's speaker is prevented from being transmitted back to the classroom, resulting in "howling" or repetitive sound.

Technical value:

Breaking the "echo closed loop" and improving the real-time and clarity of voice interaction is the key technology of two-way interaction between intelligent devices and remote communication.