Concealment method and arrangement and reproducing apparatus pro

Details Concealment method and arrangement and reproducing apparatus pro Concealment method and arrangement and reproducing apparatus pro

1996-04-01

1998-02-03

Cain, David C.

Cryptography

Cryptanalysis

380 9, 380 20, H04N 7167

Patent

active

057153124

ABSTRACT:
Arrangement for carrying out a concealment on an information signal, the information signal including subsequent signal blocks (padding sequence), each signal block including a sequence of alternate first frames and second frames of different lengths, expressed in numbers of bits, the number of first frames and second frames in a signal block being N1 and N1-1 respectively. The last frame in a signal block and the first frame in a subsequent signal block are a first frame. The arrangement includes an input terminal for receiving the information signal, a concealment unit having an input coupled to the input terminal and an output coupled to an output terminal for supplying the concealed information signal. The concealment unit is adapted to conceal the information in response to a concealment control signal. More specifically, the concealment unit is adapted to conceal a number of M subsequent frames, M being an odd integer smaller than 2.N1-1. The concealment unit includes a memory for storing M+1 subsequent frames directly preceding the M subsequent frames to be concealed. For various situations, concealment is realized by appropriately generating frames for replacing the frames to be concealed, using the frames stored in the memory.

REFERENCES:
patent: 5163136 (1992-11-01), Richmond
patent: 5323396 (1994-06-01), Lokhoff
patent: 5359468 (1994-10-01), Rhodes et al.

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