Act and amplify the sound from the sound device inside the computer, such as the Ultrasound card and chip on the motherboard to the recipient or user behavior.
Acting relay and amplify the audio from the audio source device such as a computer. Sound card and the audio chip on the motherboard to the recipient or user.
Transfer the audio signal from the device and expand inside the computer such as sound origin Sound card and sound chip on the motherboard to the recipient or the user.