The rate at which the fi xed intervals sample
the original signal each second is called the sampling
frequency, or sampling rate. For example, a sampling frequency
of 48 kHz means that samples are taken 48,000
times per second, or each sample period is 1⁄48,000 second.
Because sampling and the component of time are directly
related, a system’s sampling rate determines its upper
frequency limits. Theoretically, the higher the sampling
rate, the greater a system’s frequency range.