Abstract: The present disclosure provides a TWS earphone interaction method and system, and TWS earphones. When a main earphone and a secondary earphone receive a data packet sent by an audio source, within a residual slot of a data transmission slot, the main earphone and the secondary earphone can perform data interaction, wherein the residual slot is the remaining data transmission slot after the data packet is transmitted. When a data packet is received, the main earphone sends acknowledgment information to the audio source, within a residual slot of a next data transmission slot, the main earphone and the secondary earphone can perform data interaction, wherein the residual slot is the remaining of the next data transmission slot after the acknowledgment information is sent.

Abstract: The present disclosure provides a TWS earphone communication method and system, and TWS earphones. The method includes: when an audio source sends a data packet and a main earphone correctly receives the data packet, the main earphone sends acknowledgment information in an acknowledgment information slot; when the data packet is incorrectly received by the main earphone, no information is sent in the acknowledgment information slot; and when the data packet is received correctly by a secondary earphone, the secondary earphone does not send any information in the acknowledgment information slot. When the data packet is not received correctly by the secondary earphone, it sends interference information in the acknowledgment information slot.

Abstract: A method of preparing ferric phosphate from iron-containing waste, including: step a) providing a ferric chloride-containing mixture solution obtained from acidolysis of iron-containing waste; step b) adjusting pH of the ferric chloride-containing mixture solution to satisfy 0<pH?2 and Fe3+ concentration to 10-80 g/L with an alkaline compound and water, to obtain an iron source solution; step c) mixing and reacting the iron source solution obtained from the step b) with a solution of calcium dihydrogen phosphate in a molar ratio of P to Fe of 1 : 1-1.8, to obtain a slurry with a pH of 0.2-2; and step d) performing aging and crystal transformation on the slurry, to obtain ferric phosphate. A battery-grade ferric phosphate with high purity and good product quality can be obtained without the need for deep purification of raw materials.

Abstract: The present disclosure provides a TWS earphone interaction method and system, and TWS earphones. When a main earphone and a secondary earphone receive a data packet sent by an audio source, within a residual slot of a data transmission slot, the main earphone and the secondary earphone can perform data interaction, wherein the residual slot is the remaining data transmission slot after the data packet is transmitted. When a data packet is received, the main earphone sends acknowledgment information to the audio source, within a residual slot of a next data transmission slot, the main earphone and the secondary earphone can perform data interaction, wherein the residual slot is the remaining of the next data transmission slot after the acknowledgment information is sent.

Abstract: The present disclosure provides a TWS earphone communication method and system, and TWS earphones. The method includes: when an audio source sends a data packet and a main earphone correctly receives the data packet, the main earphone sends acknowledgment information in an acknowledgment information slot; when the data packet is incorrectly received by the main earphone, no information is sent in the acknowledgment information slot; and when the data packet is received correctly by a secondary earphone, the secondary earphone does not send any information in the acknowledgment information slot. When the data packet is not received correctly by the secondary earphone, it sends interference information in the acknowledgment information slot.