Abstract: An audio packet loss concealment method, an audio packet loss concealment device and a Bluetooth receiver are described. The audio packet loss concealment method comprises: determining whether each data packet divided into a plurality of frequency bins in a frequency domain is correct after audio data is transformed from a time domain to the frequency domain; classifying the frequency bins in the incorrect data packet into a first set of frequency bins and a second set of frequency bins; and recovering data in the first set of frequency bins by a GAPES algorithm, and recovering data in the second set of frequency bins by a predefined algorithm, wherein the predefined algorithm involves far less computation when compared with the GAPES algorithm.

Abstract: An audio data recovery method, an audio data recovery device and a Bluetooth device are described. The audio data recovery method comprises: dividing audio data into a first frequency domain component and a second frequency domain component in a frequency domain; using a second data recovery algorithm to recover the audio data in the second frequency domain component; and using a first data recovery algorithm with lower complexity than the second data recovery algorithm to recover the audio data in the first frequency domain component.

Abstract: An audio data recovery method, an audio data recovery device and a Bluetooth device are described in the present invention. The audio data recovery method comprises: receiving audio data in time domain, the audio data including a first type of data and a second type of data; transforming the audio data from the time domain into frequency domain to produce transformed first type of data and transformed second type of data; performing packet loss concealment estimation on the transformed second type of data to generate estimated second type of data in the frequency domain; transforming inversely the transformed first type of data together with the estimated second type of data from the frequency domain to the time domain; and obtaining recovered audio data in the time domain according to the first type of data in the audio data in the time domain and the estimated second type of data in the time domain.

Abstract: An audio packet loss concealment method, an audio packet loss concealment device and a Bluetooth receiver are described. The audio packet loss concealment method comprises: determining whether each data packet divided into a plurality of frequency bins in a frequency domain is correct after audio data is transformed from a time domain to the frequency domain; classifying the frequency bins in the incorrect data packet into a first set of frequency bins and a second set of frequency bins; and recovering data in the first set of frequency bins by a GAPES algorithm, and recovering data in the second set of frequency bins by a predefined algorithm, wherein the predefined algorithm involves far less computation when compared with the GAPES algorithm.

Abstract: An audio data recovery method, an audio data recovery device and a Bluetooth device are provided in the present invention. The audio data recovery method comprises: receiving a plurality of audio data packets each comprising M segments of frame data and M CRC codes each corresponding to one of the M segments of frame data; and recovering one audio data packet according to the segments of frame data and the CRC codes in N audio data packets received incorrectly N times for the same audio data.

Abstract: An energy and shock absorbing device for a child car seat comprises a seat (1), and a base (2) positioned below the seat (1) and used for supporting the seat (1), the seat (1) being slidably arranged on the base (2). A limit block (22) is formed on the base (2) and located in front of the seat (1) in a path along which the seat (1) slides relative to the base (2). Energy absorbing material (4) is arranged between the limit block (22) and the seat (1), and is compressed to deform when the seat (1) slides towards the limit block (22). When a car encounters a collision or emergency brake, the seat (1) moves relative to the base (2) due to inertia, and the energy absorbing material (4) is squeezed to deform so as to provide a buffering and shock absorbing action.

Abstract: An energy and shock absorbing device for a child car seat comprises a seat (1), and a base (2) positioned below the seat (1) and used for supporting the seat (1), the seat (1) being slidably arranged on the base (2). A limit block (22) is formed on the base (2) and located in front of the seat (1) in a path along which the seat (1) slides relative to the base (2). Energy absorbing material (4) is arranged between the limit block (22) and the seat (1), and is compressed to deform when the seat (1) slides towards the limit block (22). When a car encounters a collision or emergency brake, the seat (1) moves relative to the base (2) due to inertia, and the energy absorbing material (4) is squeezed to deform so as to provide a buffering and shock absorbing action.