Transport packet stream separating circuit in which packet can be discarded on error

Claim 2

A transport packet stream separating apparatus comprising: a storage unit for storing a data; a packet identification filter for extracting transport packets having a predetermined packet identification from a stream of transport packets, each of said extracted transport packets including at least one section; a section filter unit for determining whether a header portion of each of the extracted transport packets is coincident with a reference data, for outputting said at least one section of each of the extracted transport packets regardless of coincidence or discrepancy between said header portion of each of the extracted transport packets and said reference data, and for generating a reset signal when it is determined that said header portion of each of the extracted transport packets is not coincident with said reference data; and an interface unit for receiving the at least one section from said section filter unit, for storing the received section in said storage unit while updating a write address from a start address, and for resetting said write address to said start address in response to said reset signal, wherein when first and second halves of said header portion are respectively contained in one transport packet and a next transport packet of the extracted transport packets, said section filter unit determines the coincidence or the discrepancy between said header portion and said reference data by comparing said first half contained in said one transport packet and a corresponding portion of said reference data, and then by comparing said second half contained in said next transport packet and a remaining portion of said reference data without holding said first half.

Claim 3

A transport packet stream separating apparatus according to claim 1 , wherein said section filter unit holds a byte position of a last byte of said first half and a determination result of said first half without holding said first half itself.

Claim 4

A transport packet stream separating apparatus comprising: a storage unit for storing a data; a packet identification filter for extracting transport packets having a predetermined packet identification from a stream of transport packets, each of said extracted transport packets including at least one section; a section filter unit for determining whether a header portion of each of the extracted transport packets is coincident with a reference data, for outputting said at least one section of each of the extracted transport packets regardless of coincidence or discrepancy between said header portion of each of the extracted transport packets and said reference data, and for generating a reset signal when it is determined that said header portion of each of the extracted transport packets is not coincident with said reference data; and an interface unit for receiving the at least one section from said section filter unit, for storing the received section in said storage unit while updating a write address from a start address, and for resetting said write address to said start address in response to said reset signal, wherein said section filter unit comprises: a section start detecting unit for receiving each of the extracted transport packets and the packet identification to generate a start signal and to output said at least one section and said packet identification; a reference register for storing said reference data; a comparing unit for receiving each of the extracted transport packets, the packet identification and the start signal to output the section and packet identification of each of the extracted transport packets in response to said start signal, for comparing said header portion of each of the extracted transport packets and said reference data, and for generating said reset signal when it is determined that said header portion is not coincident with said reference data; and a comparison resultant register for storing the comparing result by said comparing unit when the header portion extends over two of the extracted transport packets.

Claim 5

A transport packet stream separating apparatus comprising: a storage unit for storing a data; a packet identification filter for extracting transport packets having a predetermined packet identification from a stream of transport packets, each of said extracted transport packets including at least one section; a section filter unit for determining whether a header portion of each of the extracted transport packets is coincident with a reference data, for outputting said at least one section of each of the extracted transport packets regardless of coincidence or discrepancy between said header portion of each of the extracted transport packets and said reference data, and for generating a reset signal when it is determined that said header portion of each of the extracted transport packets is not coincident with said reference data; and an interface unit for receiving the at least one section from said section filter unit, for storing the received section in said storage unit while updating a write address from a start address, and for resetting said write address to said start address in response to said reset signal, wherein said section filter unit comprises: a section start detecting unit for receiving each of the extracted transport packets and the packet identification to generate a start signal and to output said at least one section and said packet identification; a reference register for storing said reference data; a comparing unit for receiving each of the extracted transport packets, the packet identification and the start signal to output the section and packet identification of each of the extracted transport packets in response to said start signal, for comparing said header portion of each of the extracted transport packets and said reference data, and for generating said reset signal when it is determined that said header portion is not coincident with said reference data; and a comparison resultant register for storing the comparing result by said comparing unit when the header portion extends over two of the extracted transport packets.

Claim 6

A transport packet stream separating apparatus comprising: a storage unit for storing a data; a packet identification filter for extracting transport packets having a predetermined packet identification from a stream of transport packets, each of said extracted transport packets including at least one section; a section filter unit for determining whether a header portion of each of the extracted transport packets is coincident with a reference data, for outputting said at least one section of each of the extracted transport packets regardless of coincidence or discrepancy between said header portion of each of the extracted transport packets and said reference data, and for generating a reset signal when it is determined that said header portion of each of the extracted transport packets is not coincident with said reference data; and an interface unit for receiving the at least one section from said section filter unit, for storing the received section in said storage unit while updating a write address from a start address, and for resetting said write address to said start address in response to said reset signal, wherein said section filter unit comprises: a section start detecting unit for receiving each of the extracted transport packets and the packet identification to generate a start signal and to output said at least one section and said packet identification; a reference register for storing said reference data; a comparing unit for receiving each of the extracted transport packets, the packet identification and the start signal to output the at least one section and packet identification of said packet identification in response to said start signal, for comparing said header portion and said reference data, and for generating a discrepancy signal when it is determined that said header portion is not coincident with said reference data; a comparison resultant register for storing the comparing result by said comparing unit when the header portion extends over two of the extracted transport packets; an error detecting unit for detecting an error from each of the extracted transport packets, said start signal and said packet identification to generate an error signal; and a logical summing unit for receiving said discrepancy signal and said error signal to generate said reset signal.

Claim 7

A transport packet stream separating apparatus comprising: a storage unit for storing a data; a packet identification filter for extracting transport packets having a predetermined packet identification from a stream of transport packets, each of said extracted transport packets including at least one section; a section filter unit for determining whether a header portion of each of the extracted transport packets is coincident with a reference data, for outputting said at least one section of each of the extracted transport packets regardless of coincidence or discrepancy between said header portion of each of the extracted transport packets and said reference data, and for generating a reset signal when it is determined that said header portion of each of the extracted transport packets is not coincident with said reference data; and an interface unit for receiving the at least one section from said section filter unit, for storing the received section in said storage unit while updating a write address from a start address, and for resetting said write address to said start address in response to said reset signal, wherein said section filter unit comprises: a section start detecting unit for receiving each of the extracted transport packets and the packet identification to generate a start signal and to output said at least one section and said packet identification; a reference register for storing said reference data; a comparing unit for receiving each of the extracted transport packets, the packet identification and the start signal to output the at least one section and packet identification of said packet identification in response to said start signal, for comparing said header portion and said reference data, and for generating a discrepancy signal when it is determined that said header portion is not coincident with said reference data; a comparison resultant register for storing the comparing result by said comparing unit when the header portion extends over two of the extracted transport packets; an error detecting unit for detecting an error from each of the extracted transport packets, said start signal and said packet identification to generate an error signal; and a logical summing unit for receiving said discrepancy signal and said error signal to generate said reset signal.

Claim 8

A transport packet stream separating apparatus comprising: a storage unit for storing a data; a packet identification filter for extracting transport packets having a predetermined packet identification from a stream of transport packets, each of said extracted transport packets including at least one section; a section filter unit for determining whether a header portion of each of the extracted transport packets is coincident with a reference data, for outputting said at least one section of each of the extracted transport packets regardless of coincidence or discrepancy between said header portion of each of the extracted transport packets and said reference data, and for generating a reset signal when it is determined that said header portion of each of the extracted transport packets is not coincident with said reference data; and an interface unit for receiving the at least one section from said section filter unit, for storing the received section in said storage unit while updating a write address from a start address, and for resetting said write address to said start address in response to said reset signal, wherein said interface unit comprises: a signal generating unit for generating a write control signal in response to reception of each of parts of the section; a data latching unit for latching each of parts of said section such that said at least on section is written in said storage unit; and an address generating unit for generating said write address in response to said packet identification and a start signal while updating said write address from said start address, and for resetting said write address to said start add). in raponise to said reset signal, wherein said address generating unit comprises: a start address register for holding said start address based on said packet identification; an address offset register for holding an address offset based on said packet identification and for resetting said address offset to zero in response to said reset signal; an address adding unit for adding said start address and said address offset to generate said write signal; and an incrementing unit for incrementing said address offset by a predetermined value to write into said address offset register.

Claim 9

A transport packet stream separating apparatus comprising: a storage unit for storing a data; a packet identification filter for extracting transport packets having a predetermined packet identification from a stream of transport packets, each of said extracted transport packets including at least one section; a section filter unit for determining whether a header portion of each of the extracted transport packets is coincident with a reference data, for outputting said at least one section of each of the extracted transport packets regardless of coincidence or discrepancy between said header portion of each of the extracted transport packets and said reference data, and for generating a reset signal when it is determined that said header portion of each of the extracted transport packets is not coincident with said reference data; and an interface unit for receiving the at least one section from said section filter unit, for storing the received section in said storage unit while updating a write address from a start address, and for resetting said write address to said start address in response to said reset signal, wherein said interface unit comprises: a signal generating unit for generating a write control signal in response to reception of each of parts of the section; a data latching unit for latching each of parts of said section such that said at least on section is written in said storage unit; and an address generating unit for generating said write address in response to said packet identification and a start signal while updating said write address from said start address, and for resetting said write address to said start add). in raponise to said reset signal, wherein said address generating unit comprises: a start address register for holding said start address based on said packet identification; an address offset register for holding an address offset based on said packet identification and for resetting said address offset to zero in response to said reset signal; an address adding unit for adding said start address and said address offset to generate said write signal; and an incrementing unit for incrementing said address offset by a predetermined value to write into said address offset register.

Claim 12

A method according to claim 6 , wherein said performing step includes holding a byte position of a last byte of said first half and a determination state of said first half without holding said first half itself.

Claim 19

A method of extracting desired data from a packet stream, as recited in claim 10 wherein said packet stream is a motion picture expert group-2 (MPEG2) format.