Audio input and output device and audio input and output method

Abstract

The invention provides an audio input and output device and an audio input and output method. The device comprises a microcontroller, an audio input port and an audio output port. An output port of the microcontroller is connected to an input port of a digital-to-analog converter; an output port of the digital-to-analog converter is connected to a first input port of a first operational amplifier through a first switch; the audio input port is connected to a first input port of the first operational amplifier through a second switch; an output port of the first operational amplifier is connected to a first input port of a voltage comparator; an output port of the voltage comparator outputs comparative level to the microcontroller; the output port of the first operational amplifier outputs signals to a first input port of the second operational amplifier; a third switch and an adjustable resistor connected in parallel are connected between the first input port of the second operational amplifier and an output port of the second operational amplifier. The audio input and output method is applied to the audio input and output device. According to the audio input and output device and the audio input and output method, noise will not be produced in the process of switching internal sound sources and external sound sources, and the production cost is low.

Description

technical field [0001] The present invention relates to the field of integrated circuits, in particular to an audio input and output device and an audio input and output method for the audio input and output device. Background technique [0002] Today's audio playback devices, such as MP3 music players and mobile phones, can usually output audio from multiple different audio sources. For example, the audio playback device is integrated with a Bluetooth chip and an FM radio chip. The FM audio signal is received through radio waves, and the audio signals output by the Bluetooth chip and the FM radio chip can be played by an audio playback device. [0003] Existing audio playback equipment is usually equipped with an audio master chip, and receives the audio signals output by external audio source chips such as Bluetooth chip and FM radio chip respectively, and drives the speakers or earphones after processing the received signals. Because the audio main control chip and the F...

AI Technical Summary

Problems solved by technology

However, MCP technology is still limited by the mismatch of audio input and output DC levels

Therefore, after using the MCP technology, it is still necessary to lead the left and right output channel pins of the FM radio chip to the outside of the MCP package chip, and then connect to the DC blocking capacitor, and then connect to the MCP package chip to communicate with the audio frequency of the audio master chip. Input pin connection, this approach greatly increases the packaging cost and difficulty of the chip

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