Function UNPAD_SIGNAL

Package

Short description

Usage

    x = UNPAD_SIGNAL(y, resolution, target_sz, center)

Input

    y (numeric): The signal to be unpadded.
    resolution (int): The resolution of the signal (as a power of 2), with
        respect to the original, unpadded version.
    target_sz (numeric): The size of the original, unpadded version. Combined
        with resolution, the size of the output y is given by
        target_sz.*2.*(-resolution).
    center (boolean, optional): If true, extracts the center part of y, oth-
        erwise extracts the (upper) left corner (default false).

Output

    x (numeric): The extracted unpadded signal

Description

    To handle boundary conditions, a signal is often padded using PAD_SIGNAL
    before being convolved with CONV_SUB_1D or CONV_SUB_2D. After this, the
    padding needs to be removed to recover a regular signal. This is achieved
    using UNPAD_SIGNAL, which takes the padded, convolved signal y as input,
    as well as its resolution relative to the original, unpadded version,
    and the size of this original version. Using this, it extracts the
    coefficients in y that correspond to the domain of the original signal.
    If the center flag was specified during PAD_SIGNAL, it is specified here
    again in order to extract the correct part.

See also

• pad_signal