Video signal error detection systems

Details Video signal error detection systems Video signal error detection systems

2007-03-13

2007-03-13

Torres, Joseph D. (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Error/fault detection technique

Reexamination Certificate

active

10069686

ABSTRACT:
Mobile phones now transmit video signals at relatively slow bit rates. The signals transmitted are compressed using inter-frame prediction where sufficient similarity exists between successive picture frames. The receiver includes a decoder which reconstitutes the compressed signals received using signals stored on a buffer representing a previous picture frame. A mode decision circuit compares the signal at the output of the decoder with the previous signal stored and using the same decision criterion as used for the original compression generates a signal which indicates that either the signal is suitable for inter-frame prediction or not. This signal is then compared with the signal from the encoder indicating whether or not the current signal was inter-frame predicted or not. If equality is not detected, then an error may have taken place. Then, error concealment techniques are used.

REFERENCES:
patent: 4498104 (1985-02-01), Schulz
patent: 5488618 (1996-01-01), Kondo
patent: 5627590 (1997-05-01), Hamano
patent: 5767898 (1998-06-01), Urano et al.
patent: WO 95/03674 (1995-02-01), None

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