How is Sound Transmitted Through Bluetooth?

Bluetooth transmits sound by converting it into digital data and sending it wirelessly between devices.

The Process:

Sound to Digital: The source device (like your phone) converts the analog sound signal into digital data using an Analog-to-Digital Converter (ADC).
Data Encoding: This digital data is then encoded using a specific Bluetooth codec, such as SBC, AAC, or aptX.
Radio Transmission: The encoded data is transmitted wirelessly using radio waves in the 2.4 GHz frequency band.
Data Reception: The receiving device (like your headphones) receives the radio waves and decodes the data.
Digital to Sound: Finally, the receiving device converts the digital data back into an analog sound signal using a Digital-to-Analog Converter (DAC), producing the sound you hear.

Bluetooth Codec: This determines the quality and compression of the transmitted sound. Higher-quality codecs like aptX provide better audio quality but require more bandwidth.
Frequency Band: Bluetooth operates in the 2.4 GHz frequency band, which is shared with other wireless technologies.
Range: Bluetooth has a limited range, typically around 10 meters.

When you listen to music on your Bluetooth headphones, your phone converts the music into digital data, encodes it using a Bluetooth codec, and transmits it to the headphones. The headphones decode the data and play the sound.
When you make a phone call using a Bluetooth headset, your phone converts your voice into digital data, transmits it to the headset, and then transmits the received voice data back to the other person.