Abstract: A radio frequency apparatus and a radio frequency identification (RFID) tag detection method are provided. The radio frequency apparatus includes a reader and an RFID tag. The reader includes a first coil and a plurality of second coils. The first coil supports a first frequency band. Each second coil supports a second frequency band. The second frequency band is different from the first frequency band, and the second coils are spaced away from each other and do not overlap each other. The RFID tag includes a first and a second radio frequency circuits which supports the first frequency band and the second frequency band respectively. The first radio frequency circuit can communicate with the first coil by using the first frequency band. The second radio frequency circuit can communicate with at least one of the second coils by using the second frequency band.

Abstract: A radio frequency transmission method and a device thereof are provided. The method includes: transmitting a radio frequency command by a radio frequency reader; receiving the radio frequency command by a radio frequency tag, wherein the radio frequency command includes bits; determining a logic level of each of the bits based upon a time length of each of the bits at a voltage level of a voltage waveform by the radio frequency tag; and determining whether to transmit a response signal in response to the radio frequency reader based upon the logic level of each of the bits by the radio frequency tag.

Abstract: A method and a system for playing sound data are provided. The method for playing sound data includes defining a piece of time information, where the time information corresponds to a play time point of a piece of sound data; sending the time information by using a first radio frequency circuit; receiving the time information by using a second radio frequency circuit, and transmitting the time information to a play circuit coupled to the second radio frequency circuit; and playing, by the play circuit, the sound data at the play time point corresponding to the time information.

Abstract: A radio frequency transmission method and a device thereof are provided. The method includes: transmitting a radio frequency command by a radio frequency reader; receiving the radio frequency command by a radio frequency tag, wherein the radio frequency command includes bits; determining a logic level of each of the bits based upon a time length of each of the bits at a voltage level of a voltage waveform by the radio frequency tag; and determining whether to transmit a response signal in response to the radio frequency reader based upon the logic level of each of the bits by the radio frequency tag.

Abstract: A transmission cable structure includes a cable, a first connector, a second connector, a control circuit and a light-emitting circuit. The cable includes at least one conducting wire installed therein. The first connector includes a body portion and a connecting portion. The body portion connects with an end of the cable, while the second connector connects with another end of the cable. The control circuit is configured within the body portion. The control circuit electrically connects with the conducting wire, and generates a light-emitting signal according to an equivalent capacitance value of the conducting wire. The light-emitting circuit is configured within the body portion. The light-emitting circuit couples with the control circuit and emits light according to the light-emitting signal.

Abstract: The present disclosure provides an audio quantization coding and decoding device and a method thereof. In the method, before a quantization coding process is performed on a digital signal, the signal is pre-processed, the digital signal is split into multiple frames based on positive and negative half periods of the signal, and all audio data between two adjacent zero-crossing points belongs to the same positive and negative half periods, so as to have the same sign-bit. A pre-processing module groups the numeric data belonging to the same positive and negative half periods into the same frame. When coding, an audio quantization coding module only needs to record a sign-bit of the frame at a head of the frame, so the sign-bit of each batch of voice data in the frame may be omitted to reduce a data amount or improve a resolution of each batch of voice data.

Abstract: The present disclosure provides an audio quantization coding and decoding device and a method thereof. In the method, before a quantization coding process is performed on a digital signal, the signal is pre-processed, the digital signal is split into multiple frames based on positive and negative half periods of the signal, and all audio data between two adjacent zero-crossing points belongs to the same positive and negative half periods, so as to have the same sign-bit. A pre-processing module groups the numeric data belonging to the same positive and negative half periods into the same frame. When coding, an audio quantization coding module only needs to record a sign-bit of the frame at a head of the frame, so the sign-bit of each batch of voice data in the frame may be omitted to reduce a data amount or improve a resolution of each batch of voice data.