Patent ID: 8792656

Claim:
An all in one (AIO) computer implemented as a personal computer (PC) or a display, the AIO computer comprising: a high definition multimedia interface (HDMI) electrically connected to an external electronic device; a speaker for outputting audio signals; and a speaker control circuit electrically connected to the HDMI and the speaker, the speaker control circuit comprising: an earphone interface circuit for detecting whether an earphone is inserted and is connected to the AIO computer; a main controller electrically connected to the earphone interface circuit; a signal processing unit electrically connected to the HDMI, the main controller and the earphone interface circuit, the signal processing unit for processing the audio signals; and a signal control circuit electrically connected to the signal processing unit and the main controller, wherein when the AIO computer is implemented as the PC, and the earphone interface circuit detects the earphone is connected to the AIO computer, the main controller provides and sends a first muting signal; when the AIO computer is implemented as the display, the earphone interface circuit detects the earphone is inserted into the AIO computer, the main controller sends a command signal to the signal processing unit, and the signal processing unit sends a second muting signal under a control of the main controller, and the signal control circuit controls and mutes the speaker according to the first muting signal and the second muting signal.