Signal Processing Blockset™

IDWT - Compute inverse discrete wavelet transform (IDWT) of input

Library

Transforms

dspxfrm3

Description

Note   The IDWT block is the same as the Dyadic Synthesis Filter Bank block in the Multirate Filters library, but with different default settings. See the Dyadic Synthesis Filter Bank for more information on how to use the block.

The IDWT block computes the inverse discrete wavelet transform (IDWT) of the input subbands. By default, the block accepts a single sample-based vector or matrix of concatenated subbands. The output is frame based, and has the same dimensions as the input. Each column of the output is the IDWT of the corresponding input column.

You must install the Wavelet Toolbox product for the block to automatically design wavelet-based filters to compute the IDWT. Otherwise, you must specify your own lowpass and highpass FIR filters by setting the Filter parameter to User defined.

For detailed information about how to use this block, see Dyadic Synthesis Filter Bank.

Examples

See the examples in the Dyadic Synthesis Filter Bank block reference.

Supported Data Types

• Double-precision floating point

• Single-precision floating point

See Also

Identity Matrix

IFFT