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a technology of description encoder and quantization, applied in the field of encoders, can solve problems such as inability to recover information loss
Active Publication Date: 2011-06-09
AT&T INTPROP I LP
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Without more, this loss of information is not recoverable.
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[0014]Generally speaking, a signal stream can be encoded into N descriptions and, as indicated above, the prior art teaches that an (N:K) multiple description binning encoder like the one depicted in FIG. 3 can be created to result in an arrangement where decoding is possible even when only K descriptions are available, where K is a chosen integer less than N.
[0015]In accord with the principles of this invention, an encoder can be designed which (a) provides N descriptions, (b) employs binning, (c) permits full decoding when a predetermined number of descriptions, K0 descriptions are available; and this is achieved by employing quantization splitting on L of the descriptions. The value of L is not greater than K, of course.
[0016]The principles of this invention are best applicable for N>2, N>K>1.
[0017]FIG. 4 depicts the structure of an embodiment where N=3, K=2, and L=1. What that means is that three descriptions are developed, that the binning is selected in accord with the teachin...
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Abstract
An improved (N:K) multiple description binning encoder that employs binning yet permits recovery of the input signal when fewer than K of the descriptions are available. This is achieved by quantization splitting a chosen number of descriptions.
Description
BACKGROUND[0001]This invention relates to encoders and, more particularly, to multiple description encoders.[0002]FIG. 1 depicts encoders 10, 11, 12 that are responsive to an input signal, developing code signal streams S1, S2, and S3, respectively. Illustratively, encoders 10, 11 and 12 output 3 bit codes and are, in a sense, the same except for an offset. For example, encoder 10 outputs index 0 for signals, A, in the range 0≦s≦u, (where u is ⅛ of the signal's dynamic range M; i.e.,u=M8) and outputs index 1 in the range u≦s<2u, etc.; encoder 11 is offset byu3,so it outputs index 0 in the rangeu3≤s<4u3and outputs index 1 in the range4u3≤s<7u3,etc., and encoder 12 outputs is offset by2u3,so it outputs index 0 in the range2u3≤s<5u3and outputs index 1 in the range5u3≤s<8u3,etc. This is shown in FIG. 2A. In this arrangement, signal s can be decoded with granularity ofu3when all three of the code streams S1, S2, and S3 are available for decoding. When only one of the code ...
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Patent Type & Authority Applications(United States)
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