<Table> <Tr> <Td> </Td> <Td> This article may be confusing or unclear to readers . Please help us clarify the article . There might be a discussion about this on the talk page . (January 2014) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article may be confusing or unclear to readers . Please help us clarify the article . There might be a discussion about this on the talk page . (January 2014) (Learn how and when to remove this template message) </Td> </Tr> <P> In signal processing, the Nyquist rate, named after Harry Nyquist, is twice the bandwidth of a bandlimited function or a bandlimited channel . This term means two different things under two different circumstances: </P> <Ol> <Li> as a lower bound for the sample rate for alias - free signal sampling (not to be confused with the Nyquist frequency, which is half the sampling rate of a discrete - time system) and </Li> <Li> as an upper bound for the symbol rate across a bandwidth - limited baseband channel such as a telegraph line or passband channel such as a limited radio frequency band or a frequency division multiplex channel . </Li> </Ol>

What is the nyquist rate for the signal