Communications Toolbox

dpcmdeco

Decode using differential pulse code modulation

Syntax

sig = dpcmdeco(indx,codebook,predictor)
[sig,quanterror] = dpcmdeco(indx,codebook,predictor)

Description

sig = dpcmdeco(indx,codebook,predictor) implements differential pulse code demodulation to decode the vector indx. The vector codebook represents the predictive-error quantization codebook. The vector predictor specifies the predictive transfer function. If the transfer function has predictive order M, then predictor has length M+1 and an initial entry of 0. To decode correctly, use the same codebook and predictor in dpcmenco and dpcmdeco.

See Representing Partitions, Representing Codebooks, or the reference page for quantiz in this chapter, for a description of the formats of partition and codebook.

[sig,quanterror] = dpcmdeco(indx,codebook,predictor) is the same as the syntax above, except that the vector quanterror is the quantization of the predictive error based on the quantization parameters. quanterror is the same size as sig.

Note   You can estimate the input parameters codebook, partition, and predictor using the function dpcmopt.

Examples

See Example: DPCM Encoding and Decoding and Example: Comparing Optimized and Nonoptimized DPCM Parameters for examples that use dpcmdeco.

See Also

quantiz, dpcmopt, dpcmenco, Differential Pulse Code Modulation

References

[1] Kondoz, A. M., Digital Speech, Chichester, England, John Wiley & Sons, 1994.

distspec

dpcmenco

© 1994-2005 The MathWorks, Inc.