Signal receiver adaptive to noise level

Abstract

A signal receiver adaptive to a noise level includes a first comparator, a second comparator, a control unit, and a reference voltage changing unit. The first comparator compares a voltage of a received signal with a first reference voltage, and the second comparator compares the voltage of the received signal with a second reference voltage. The control unit outputs a control voltage having a voltage level corresponding to the number of output pulses per unit time of the first comparator. The reference voltage changing unit changes the magnitudes of the first reference voltage and the second reference voltage in response to a voltage level of a control voltage. The second comparator compares the changed second reference voltage with the received signal to output a transmission signal from which noise is cancelled. A voltage level of noise to be cancelled from the received signal varies according to a noise level, so the noise cancellation adaptive to the noise level is performed.

Dependencies are inferred from the claim text.