Bluetooth earphone system, and earphone case for storing and charging Bluetooth earphones

A Bluetooth (BT) earphone system, comprising:

• a pair of BT earphones;
• and
• an earphone case for storing and charging the pair of BT earphones, the earphone case comprising:
• an earphone container for accommodating the pair of BT earphones, the earphone container including multiple case terminals configured to be coupled to multiple earphone terminals of the pair of BT earphones;
• a rechargeable battery;
• a charging circuit configured to charge the pair of BT earphones with power of the rechargeable battery when the earphone container accommodates the pair of BT earphones;
• a BT circuit configured to be paired with the pair of BT earphones when the earphone container accommodates the pair of BT earphones, and further configured to communicate with the pair of BT earphones through BT communication after the pair of BT earphones is taken out from the earphone container;
• a microphone circuit configured to receive outside sound and thereby generate a microphone signal after the pair of BT earphones is taken out from the earphone container;
• an audio circuit configured to generate an audio signal according to the microphone signal and then provide the audio signal for the pair of BT earphones through the BT circuit in a predetermined mode;
• a user interface circuit configured to provide a user control signal for the pair of BT earphones through the BT circuit in response to user control;
• and
• a control circuit configured to control interaction between the earphone case and the pair of BT earphones,
• wherein the pair of BT earphones is configured to communicate with the earphone case through the multiple earphone terminals when the earphone container accommodates the pair of BT earphones, and to communicate with the earphone case through the BT communication after the pair of BT earphones is taken out from the earphone container.