Apparatus for system decoder and method for error correction of packet data
First Claim
1. An apparatus for system decoder, comprising:
- a packet data processing unit for extracting a payload from a plurality of inputted packet data, a packet loss detection unit for detecting sequence number of packet data not arrived yet and of packet data with transmission error and for outputting a unique word for error detection instead of payload of the packet data not arrived yet and of the packet data with transmission error corresponding to the detected sequence number, and a media data reconstruction unit for rearranging the payload and the unique word in such order as to be decoded by an application decoder.
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Abstract
When packet loss occurs during transmission of mobile communication of digital media data, the media data to be delivered to an application decoder is in such form that payload of the packet where loss has occurred is omitted, and accurate position of transmission error cannot be detected. According to the present invention, a data string not contained in specification and standards of the application decoder is inserted to a section with packet loss of the received data by system decoder, and the application decoder can explicitly judge from the data string that communication error has occurred is. As a result, the application decoder can detect accurate position of transmission error. Also, by arranging the data string to be inserted between the system decoder and the application decoder, the position of the error can be detected more accurately.
92 Citations
16 Claims
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1. An apparatus for system decoder, comprising:
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a packet data processing unit for extracting a payload from a plurality of inputted packet data, a packet loss detection unit for detecting sequence number of packet data not arrived yet and of packet data with transmission error and for outputting a unique word for error detection instead of payload of the packet data not arrived yet and of the packet data with transmission error corresponding to the detected sequence number, and a media data reconstruction unit for rearranging the payload and the unique word in such order as to be decoded by an application decoder. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for system decoder, comprising:
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a packet data processing unit for extracting up a payload from a plurality of inputted packet data, a retransmission judgment unit for performing retransmission judgment as to whether packet data not arrived yet and packet data with transmission error are to be retransmitted or not and for outputting result of judgment, a packet loss detection unit for;
detecting sequence number of the packet data not arrived yet and of the packet data with transmission error, outputting the sequence number to said retransmission judgment unit, and outputting a unique word for error detection instead of the payload of the packet data not arrived yet and of the packet data with transmission error from the result of judgment of said retransmission judgment unit, and a media data reconstruction unit for rearranging said payload and said unique word in such order as to be decoded by the application decoder. - View Dependent Claims (8, 9)
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10. A method for correcting packet data, comprising the steps of:
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extracting a payload from a plurality of inputted packet data, detecting sequence number of packet data not arrived yet and of packet data with transmission error, outputting a unique word instead of the payload of the packet not arrived yet and of the packet with transmission error, generating a data rearranged said payload and said unique word in such order as to be decoded by the application decoder, detecting the unique word from said rearranged data signal to thereby correct the unique word, and correcting said rearranged data so that compliant to the specification of said application decoder. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification