Why does downsampling stretch a signals frequency response and upsampling shrink and create images of a signals frequency response?

1. What does downsampling do to a signal?
2. What is the effect of upsampling and downsampling?
3. What is the purpose of upsampling downsampling?
4. What is upsampling and downsampling in signal processing?

What does downsampling do to a signal?

(1) To make a digital audio signal smaller by lowering its sampling rate or sample size (bits per sample). Downsampling is done to decrease the bit rate when transmitting over a limited bandwidth or to convert to a more limited audio format.

What is the effect of upsampling and downsampling?

Downsampling is the reduction in spatial resolution while keeping the same two-dimensional (2D) representa- tion. It is typically used to reduce the storage and/or transmission requirements of images. Upsampling is the increasing of the spatial resolution while keeping the 2D representation of an image.

What is the purpose of upsampling downsampling?

Downsampling, which is also sometimes called decimation, reduces the sampling rate. Upsampling, or interpolation, increases the sampling rate. Before using these techniques you will need to be aware of the following.

What is upsampling and downsampling in signal processing?

¯ downsampling (decimation) – subsampling a discrete signal. ¯ upsampling – introducing zeros between samples to create a longer. signal. ¯ aliasing – when sampling or downsampling, two signals have same. sampled representation but differ between sample locations.