Method and apparatus for conversion of compressed bit stream representation of video signal
AssigneeAT&T Corp.
InventorDror Nahumi
Life of this patent
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Abstract
A compressed bit stream converter is utilized for converting the video signal parameter bit stream representations of a video signal that are encoded using the temporal and spatial resolution characteristics of a first video transmission standard to the video signal parameter bit stream representations of the video signal that are encoded using the temporal and spatial resolution characteristics of a second video transmission standard. The representation of the video signal remains in compressed form and is not converted back into video signal form using a video encoder during the conversion between the compressed bit streams encoded using the first and second video transmission standard.
Claims22
A method for converting a first compressed bit stream representation of a video signal that is encoded using a first video transmission standard to a second compressed bit stream representation of the video signal that is encoded using a second video transmission standard, comprising the steps of:
- receiving the first compressed bit stream,
- wherein said first compressed bit stream is comprised of a plurality of entropy encoded bits that is encoded using the first video transmission standard;
- identifying a plurality of bits in the first compressed bit stream which comprise a reference and an incoming image frame;
- entropy decoding the plurality of bits;
- converting the plurality of bits to a plurality of bits encoded using the second video transmission standard;
- and,
- entropy encoding the converted plurality of bits to form the second compressed bit stream representation of the reference and the image frame.
A method for converting a first compressed bit stream representation of a video signal that is encoded using a first video transmission standard to a second compressed bit stream representation of the video signal that is encoded using a second video transmission standard comprising the steps of:
- receiving the first compressed bit stream,
- wherein said video signal is comprised of a digital bit representation of a plurality of transmitted moving video image frames, and
- wherein said first compressed bit stream is comprised of a plurality of bit streams that is comprised of a plurality of entropy encoded bits, respectively, and encoded using the first video transmission standard, said plurality of bit streams being representative of the digital bit representation of the plurality of transmitted moving video image frames;
- identifying a plurality of bits in the respective plurality of bit streams which comprise a reference and an incoming image frame;
- extracting from the first compressed bit stream and then entropy decoding the plurality of bits in the respective plurality of bit streams;
- converting the plurality of bits in the respective plurality of bit streams to a plurality of bits in a respective plurality of bit streams that is encoded using the second video transmission standard;
- and,
- entropy encoding and then multiplexing the converted plurality of bits in the respective plurality of bit streams to provide the second compressed bit stream representation of the reference and image frame.
An apparatus for converting a first compressed bit stream representation of a video signal that is encoded using a first video transmission standard to a second compressed bit stream representation of the video signal that is encoded using a second video transmission standard comprising:
- a synchronizer circuit for receiving the first compressed bit stream,
- wherein said video signal is comprised of a digital bit representation of a plurality of transmitted moving video image frames, and
- wherein said first compressed bit stream is comprised of a plurality of bit streams that is comprised of a plurality of entropy encoded bits, respectively, and encoded using the first video transmission standard, said plurality of bit streams being representative of the digital bit representation of the plurality of transmitted moving video image frames,
- said synchronizer circuit identifying a plurality of bits in the respective plurality of bit streams which comprise a reference and an incoming image frame;
- an entropy decoder/video signal parameter extractor (ED/VSPE) circuit for extracting from the first compressed bit stream and then entropy decoding the plurality of bits in the respective plurality of bit streams;
- a parameter rate controller circuit for converting the plurality of bits in the respective plurality of bit streams to a plurality of bits in a respective plurality of bit streams that is encoded using the second video transmission standard;
- and,
- an entropy encoder/video signal parameter synthesizer (EE/VSPS) circuit for entropy encoding and then multiplexing the converted plurality of bits in the respective plurality of bit streams to provide the second compressed bit stream representation of the reference and incoming image frame.
Dependencies are inferred from the claim text.