Patent ID: 7606329

Claim:
A data receiver comprising: a frequency converter for receiving a radio frequency signal and converting the radio frequency signal received to a baseband signal; an RSSI (Received Signal Strength Indication) signal generator for outputting an RSSI signal indicating a received strength indication level of the radio frequency signal; a digitizer for digitalizing the baseband signal to output data; a receiver demodulator for demodulating the data to output a demodulated signal; a comparator for comparing a level of the RSSI signal with a reference level to output a control signal for controlling operation according to a result from comparison to said frequency converter said digitizer and said receiver demodulator; and an adjusting circuit operative in response to the demodulated signal for adjusting the reference level; wherein said adjusting circuit is provided with a set value for comparison, calculates a difference of the reference level currently set with the set value for comparison, and operates the difference calculated on a basis of the demodulated signal to produce a new reference level.