Patent ID: 6064867
Filing Date: 2000-05-16
Classification: H03J

Abstract:
A receiving apparatus comprising:receiving means for receiving time-division-duplexed first and second radio wave signals, having the same carrier frequency, including first and second data having different first and second data rates respectively, each of said first and second data including a synchronizing word;frequency converting means for frequency-converting an output of said receiving means with a local oscillation signal;local oscillation means for generating said local oscillation signal in accordance with a frequency control signal;demodulation means for demodulating an output of said frequency converting means and outputting a demodulated signal;detection means for detecting said synchronizing word from said demodulated signal, detecting whether a frame synchronizing condition is established, and detecting whether said first radio wave signal is being received;frequency error detection means for detecting a frequency error in said output of said demodulation means; andfrequency control signal generation means for generating said frequency control signal with a value of said frequency control signal is varied in accordance with said detected frequency error while said first radio wave signal being received and for generating said frequency control signal with said value held while said first radio wave signal is not being received.