Audio control circuit capable of processing both digital and analog audio signals

摘要

An audio control circuit receives analog audio signals and digital audio signals via an audio signal input interface. The audio control circuit includes an audio codec chip, a first control circuit, a first switch circuit, a second control circuit, and a second switch circuit. The first control circuit obtains the analog audio signals from the audio signal input interface and converts the analog audio signals into first control signals to control the first switch circuit turned on and off. The second control circuit obtains the digital audio signals from the audio signal input interface and converts the digital audio signals into second control signals to control the second switch circuit turned on and off. The audio codec chip receives the analog audio signals in response to the first switch turned on and receives the digital audio signals in response to the second switch turned on.

主权项

1. An audio control circuit comprising:
an audio codec chip comprising an analog signal codec unit configured to encode and decode analog audio signals, and a digital signal codec unit configured to encode and decode digital audio signals; an audio signal input interface configured to receive audio signals; a first control circuit configured to obtain the analog audio signals from the audio signals and converting the analog audio signals into first control signals; a first switch circuit coupled between the audio codec chip and the first control circuit, the first switch circuit turned on and off according to the first control signals; a second control circuit configured to obtain the digital audio signals from the audio signals and converting the digital audio signals into second control signals; and a second switch circuit coupled between the audio codec chip and the second control circuit, the second switch circuit turned on and off according to the second control signals; wherein the audio codec chip configures the analog signal codec unit to receive the analog audio signals in response to the first control signals, and the audio codec chip further configures the digital signal codec unit to receive the digital audio signals in response to the second control signals; the first switch circuit comprises: a switch comprising a switch control terminal, a switch first terminal, and a switch second terminal, the switch first terminal coupled to the audio signal input interface, and the switch second terminal coupled to the analog signal codec unit; a first resistor with a first resistor first end coupled to the first control circuit, and a first resistor second end coupled to the switch control terminal; and a second resistor with a second resistor first end coupled a fourth node between the switch second terminal and the analog signal codec unit, and a second resistor second end coupled to a ground.