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As shown in Figure 2 below, it is mainly used in teleconferencing system, which is equivalent to eliminating the
microphone line of traditional telephone system and making the microphone part wireless.
Figure 2
As shown in Figure 3 below, it is mainly applied in the home living room scenario, where the sound of the TV is
transmitted to the Bluetooth speaker or earphone through the Dongle.
Figure 3
2. Schematic diagram
The schematic diagram of this case is shown in Figure 4 below. The computer is connected to Don
gle through USB Audio, and dongle is connected to Bluetooth speaker or earphone through Bluetoot
h A2DP or HFP. In other words, music on the computer can be pushed to Bluetooth speaker or ear
phone. Or use bluetooth speaker or headset through chat software or teleconferencing software and
friends for voice calls, through USB HID and Bluetooth AVRCP, Bluetooth speaker or headset can a
lso do some control on PC playback.