Principle of Bluetooth audio
A simple Bluetooth smart speaker base includes: power supply, speaker, housing. Specifically include: data synchronization receiving module (including EPROM), digital to analog conversion module (D/A), power amplifier module (pre-op amplifier + post-power amplifier).
The ordinary portable Bluetooth smart speaker directly obtains the audio signal source through the 3.5mm audio plug, and then amplifies the audio signal through the internal amplification circuit and then pushes the speaker to sound. Now the audio output end of the Bluetooth headset is connected in parallel to the 3.5mm audio plug of the portable speaker, so that the mobile phone can send the audio information to the Bluetooth headset through Bluetooth, and the speaker can amplify the audio signal sent by the Bluetooth headset to achieve the purpose of amplification.
For the same reason, Bluetooth can control the microphone of the mobile phone, and after the Bluetooth is connected to the mobile phone, you can answer the phone by voice control.
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