Audio ICs, or audio integrated circuits, are chips specially designed to process, amplify, decode and control audio signals. They mainly include functions such as audio power amplifiers, codec chips, microphone preamplifiers, sound effect processing, noise reduction and volume control. Common types include Class D, Class AB amplifier ICs and audio codec ICs integrating DAC and ADC. They are widely used in various electronic products such as headphones, speakers, mobile phones, car audio and smart devices to realize sound collection, conversion, amplification and playback output.