Keyless access control receiver

A signal correction method and receiver receives an asynchronous wireless signal including a code signal, and determines whether the code signal is discriminated as a regular code. When the determined code signal is not discriminated as the regular code, the signal correction method and receiver changes a sampling time for the asynchronous wireless signal within a predetermined range on sampling. When the code signal is still not discriminated as the regular code after changing the sampling time, the signal correction method and receiver changes a tuning frequency of a local oscillation signal.