Interleaver mode detection in a digital video receiver
AssigneeThomson Licensing
InventorsIvonete Markman, Weixiao Liu
Life of this patent
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Abstract
A method and apparatus for decoding received digital data representing video, audio, information or a combination thereof. After a forward error correction (FEC) frame sync lock is detected, a counter is incremented corresponding to the number of identical control words decoded from the received data. If the number of identical control words is above a threshold value, the control word is used to operate the decoder in a mode corresponding to the control word. Otherwise, the system repeats the operation of determining whether a FEC frame sync lock is detected.
Claims17
A method for determining the operating mode used for decoding received packetized data comprising the steps of:
- a) receiving a plurality of data packets, wherein each data packet has a control word;
- b) extracting the control word from each packet as to capture a plurality of control words;
- c) determining that a number of control words from said plurality of control words are identical;
- d) using said control word to set a decoder operating mode when said determined number of identical control words is above a threshold number.
A method for determining a deinterleaver operating mode used by a receiver to decode received digital data comprising the steps of:
- a) initializing a frame sync detector;
- b) detecting a forward error correction sync lock from a received forward error correction frame using a frame sync trailer that corresponds to said frame;
- c) capturing a plurality of control words from a plurality of forward error correction frames wherein each frame has a corresponding control word;
- d) determining that a number of control words from said plurality of control words are identical control words and said determined number of identical control words is above a threshold number;
- e) using said identical control word to set a deinterleaver mode selected from a plurality of deinterleaver modes upon determining said determined number of identical control words is above the threshold number.
Dependencies are inferred from the claim text.