Audio mixing device and audio mixing method
AssigneeRealtek Semiconductor Corp.
InventorChung-Hui Weng
Life of this patent
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Abstract
An output buffer set is coupled to a first pair of pins and configured to output art audio output signal to the first pair of pins. A direct current (DC) shifting buffer set is coupled between the audio codec circuit and the first pair of pins, and is directly coupled to the output buffer set and the first pair of pins. An audio port is coupled to the first pair of pins. The DC shifting buffer set is configured to receive a first audio input signal from the audio port through the first pair of pins. The audio codec circuit is configured to record the audio output signal back and mix the recorded audio output signal with a second audio input signal, or mix the first audio input signal with a third audio input signal.
Claims15
An audio mixing device, comprising:
- an audio codec circuit;
- an output buffer set coupled to a first pair of pins and configured to output an audio output signal to the first pair of pins;
- a direct current (DC) shifting buffer set coupled between the audio codec circuit and the first pair of pins, and directly coupled to the output buffer set and the first pair of pins;
- and
- an audio port coupled to the first pair of pins, wherein the DC shifting buffer set is configured to receive a first audio input signal from the audio port through the first pair of pins,
- wherein the audio codec circuit is configured to record the audio output signal back via the DC shifting buffer set and mix the recorded audio output signal with a second audio input signal, or mix the first audio input signal with a third audio input signal,
- wherein a buffer of the DC shifting buffer set comprises:
- an alternating current (AC) signal source;
- a buffer circuit having a first input terminal, a second input terminal and an output terminal, wherein the output terminal is coupled to the first input terminal and the buffer circuit is configured to receive a DC voltage;
- a first resistor coupled between the AC signal source and the second input terminal of the buffer circuit;
- and
- a second resistor coupled to the second input terminal and configured to receive the DC voltage,
- wherein the output terminal of the buffer circuit is directly coupled to the first input terminal of the buffer circuit.
An audio mixing method, comprising:
- outputting, by an output buffer set in an audio mixing device, an audio output signal to a first pair of pins;
- receiving, by a direct current (DC) shifting buffer set in the audio mixing device, a first audio input signal from an audio port through the first pair of pins, wherein the DC shifting buffer set is directly coupled to the output buffer set and the first pair of pins;
- and
- recording, by an audio codec circuit in the audio mixing device, the audio output signal back via the DC shifting buffer set and mixing, by the audio codec circuit, the recorded audio output signal with a second audio input signal, or mixing the first audio input signal with a third audio input signal,
- wherein a buffer of the DC shifting buffer set comprises:
- an alternating current (AC) signal source;
- a buffer circuit having a first input terminal, a second input terminal and an output terminal, wherein the output terminal is coupled to the first input terminal and the buffer circuit is configured to receive a DC voltage;
- a first resistor coupled between the AC signal source and the second input terminal of the buffer circuit;
- and
- a second resistor coupled to the second input terminal and configured to receive the DC voltage,
- wherein the output terminal of the buffer circuit is directly coupled to the first input terminal of the buffer circuit.
Dependencies are inferred from the claim text.