Patent ID: 11929722
Assignee: REALTEK SEMICONDUCTOR CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. An audio control circuit, comprising:
an universal serial bus (USB) interface circuit, arranged to connect to a host device; and
a processing circuit, coupled to the USB interface circuit, configured to perform an enumeration process with the host device via the USB interface circuit, and to determine if the host device is operating in a BIOS stage or an operating system stage to generate a control signal according to contents of packets during the enumeration process, wherein the BIOS stage indicates that the host device has not completed operations of recognizing a type of the audio control circuit;
wherein when the processing circuit determines that the host device operates in the BIOS stage, the processing circuit generates the control signal to enable a de-pop circuit; and when the processing circuit determines that the host device operates in the operating system stage, the processing circuit generates the control signal to disable the de-pop circuit.