Table of Contents
QccVectorIntSubsample, QccVectorIntUpsample - integer-vector down/up
sampling
#include "libQccPack.h"
int QccVectorIntSubsample(const
QccVectorInt input_signal, int input_length, QccVectorInt output_signal,
int output_length, int sampling_flag);
int QccVectorIntUpsample(const
QccVectorInt input_signal, int input_length, QccVectorInt output_signal,
int output_length, int sampling_flag);
QccVectorIntSubsample()
removes every other vector component from input_signal, returning the
result in output_signal. That is input_signal is downsampled, or subsampled,
by a factor of 2. If sampling_flag is QCCVECTORINT_EVEN, every odd-indexed
vector component is discarded; if sampling_flag is QCCVECTORINT_ODD, every
even-indexed vector component is discarded. The vector components are assumed
to be indexed such that the first component in the vector is index 0 (and
even index). The subsampling operation is performed until either output_signal
is full, as determined from output_length, or until the end of input_signal
is reached. Note that it is not necessary for output_length to be exactly
half of input_length; for example, it is permissible for input_length
to be odd. output_signal is assumed to be allocated with length at least
output_length.
QccVectorIntUpsample() inserts zeros between every other
vector component of input_signal, returning the result as output_signal,
which is assumed to be allocated to length output_length before the function
call. If sampling_flag is QCCVECTORINT_EVEN, the odd-indexed vector components
of output_signal are zeros; if sampling_flag is QCCVECTORINT_ODD, the
even-indexed vector components of output_signal are zeros. The upsampling
operation is performed until either output_signal is completely filled
with samples or zeros, or the end of input_signal is reached. Note that
it is not necessary for output_length to be exactly twice input_length.
QccVectorInt(3)
, QccPack(3)
Copyright (C) 1997-2021
James E. Fowler
Table of Contents
