Critical sampling matlab

1. What does critically sampled mean?
2. What is sampling rate in Matlab?
3. How do you reduce sampling rate in Matlab?

What does critically sampled mean?

With two analysis filters, downsampling the output of each analysis filter by two at each stage ensures that the total number of output samples equals the number of input samples. The case where the number of analysis filters is equal to the downsampling factor is referred to as critical sampling.

What is sampling rate in Matlab?

The sample rate used on compact discs is 44.1 kHz, while the sample rate used on digital audio tape is 48 kHz. Part two changes the sample rate of a recorded speech sample from 7418 Hz to 8192 Hz. Create an input signal consisting of a sum of sine waves sampled at 44.1 kHz.

How do you reduce sampling rate in Matlab?

y = downsample( x , n ) decreases the sample rate of x by keeping the first sample and then every n th sample after the first. If x is a matrix, the function treats each column as a separate sequence. y = downsample( x , n , phase ) specifies the number of samples by which to offset the downsampled sequence.