Transport demultiplexor with bit maskable filter
First Claim
1. A transport demultiplexor for receiving a transport stream, the transport demultiplexor comprising:
- a) front end logic;
b) a packet buffer;
c) a video unloader;
d) a data unloader;
e) an audio unloader, and wherein said front end logic receives the transport stream and delivers the transport stream to the packet buffer, and wherein said packet buffer delivers selected transport stream video data to the video unloader and selected transport audio data to the audio unloader, and wherein the said packet buffer delivers other transport stream data to the data unloader for delivering to system memory; and
f) a string comparator, the string comparator including;
i) a compare register, the compare register storing at least one compare value filter;
ii) a masking register, the masking register designating at least a portion of the compare value filter;
iii) an address register; and
wherein the string comparator compares the other transport stream data from the data unloader to the designated at least a portion of the compare value filter and stores a destination address of the other transport stream data at the address register when the compared other transport stream data matches the designated at least a portion of the compare value filter.
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Accused Products
Abstract
The preferred embodiment of the present invention provides an improved transport demultiplexor that can receive and filter different data types before sending the data to system memory. The preferred embodiment provides a string comparator to facilitate real time filtering of continuous incoming data before loading the data into system memory. The string comparator preferably uses a bit-maskable matching filter that filters system data in real time as the data is being delivered to system memory. When data matching the filter is located, the destination address of that data is determined and delivered to the processor. This allows the processor to quickly locate the desired data and thus facilitates the real time processing of that data.
40 Citations
18 Claims
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1. A transport demultiplexor for receiving a transport stream, the transport demultiplexor comprising:
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a) front end logic; b) a packet buffer; c) a video unloader; d) a data unloader; e) an audio unloader, and wherein said front end logic receives the transport stream and delivers the transport stream to the packet buffer, and wherein said packet buffer delivers selected transport stream video data to the video unloader and selected transport audio data to the audio unloader, and wherein the said packet buffer delivers other transport stream data to the data unloader for delivering to system memory; and f) a string comparator, the string comparator including; i) a compare register, the compare register storing at least one compare value filter; ii) a masking register, the masking register designating at least a portion of the compare value filter; iii) an address register; and wherein the string comparator compares the other transport stream data from the data unloader to the designated at least a portion of the compare value filter and stores a destination address of the other transport stream data at the address register when the compared other transport stream data matches the designated at least a portion of the compare value filter. - View Dependent Claims (2, 3, 4, 5, 6, 13, 14, 15, 16, 17, 18)
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7. A transport demultiplexor for receiving MPEG-2 transport stream, the transport demultiplexor comprising:
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a) a packet buffer; b) front end logic, the front end logic selectively receiving the MPEG-2 transport stream and the alternative transport stream, the front end logic comprising; i) a synchronizer, the bypassable synchronizer receiving the MPEG-2 transport stream; ii) a packet parser, the bypassable packet parser selectively receiving the MPEG-2 transport stream, wherein the packet parser retrieves identification information from transport stream packets, and wherein the packet parser retrieves identification information from the MPEG-2 transport stream and appends packet identification from the retrieved identification information to the MPEG-2 transport packets, the appended packet identification used identify the MPEG-2 transport stream packets as video packets, audio packets or system data packets; c) a video unloader, the video unloader receiving selected MPEG-2 video packets from the packet buffer; d) an audio unloader, the audio unloader receiving selected MPEG-2 audio packets from the packet buffer; e) data unloader, the data receiving MPEG-2 system data packets and other transport stream data packets, the data unloader delivering the MPEG-2 system data packets and other transport stream data packets to system memory as system memory data for processing; and f) a string comparator, the string comparator including; i) a compare register, the compare register storing at least one compare value filter; ii) a masking register, the masking register designating at least a portion of the compare value filter; iii) an address register; and wherein the string comparator compares system memory data from the data unloader to the designated at least a portion of the compare value filter and stores a destination address of the system memory data at the address register when the compared system memory data matches the designated at least a portion of the compare value filter.
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8. A transport demultiplexor for receiving a transport stream, the transport demultiplexor comprising:
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a) a packet buffer; b) front end logic, the front end logic selectively receiving a MPEG-2 transport stream and an alternative transport stream, the alternative transport stream comprising non-MPEG-2 data, the front end logic comprising; i) a bypassable synchronizer, the bypassable synchronizer receiving and synchronizing the MPEG-2 transport stream; ii) a bypassable packet parser, the bypassable packet parser selectively receiving the MPEG-2 transport stream, wherein the packet parser retrieves identification information from transport stream packets, and wherein the packet parser retrieves identification information from the MPEG-2 transport stream and appends packet identification from the retrieved identification information to the MPEG-2 transport packets, the appended packet identification used identify the MPEG-2 transport stream packets as video packets, audio packets or system data packets; c) a video unloader, the video unloader receiving selected MPEG-2 video packets from the packet buffer; d) an audio unloader, the audio unloader receiving selected MPEG-2 audio packets from the packet buffer; e) a data unloader, the data unloader receiving MPEG-2 system data packets and other transport stream data packets, the data unloader delivering the MPEG-2 system data packets and other transport stream data packets to system memory as system memory data for processing; and f) a string comparator, the string comparator including; i) a compare register, the compare register storing at least one compare value filter; ii) a masking register, the masking register designating at least a portion of the compare value filter; and iii) an address register, wherein the string comparator compares system memory data from the data unloader to the designated at least a portion of the compare value filter and stores a destination address of the system memory data at the address register when the compared system memory data matches the designated at least a portion of the compare value filter. - View Dependent Claims (9, 10, 11, 12)
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Specification