Patent ID: 7623890

Claim:
A receiver that receives a transmission signal into which an analog signal and a digital signal are incorporated, the carriers of said analog and digital signal having an identical center frequency, said digital signal having an upper side digital signal which is located in a higher frequency range on a frequency axis than said analog signal and a lower side digital signal which is located in a lower frequency range on the frequency axis than said analog signal, and said receiver including a signal processing device configured to selectively demodulate either said analog signal or said digital signal, said receiver comprising: a first filter means for filtering said transmission signal such that said upper side and lower side digital signals are attenuated and said analog signal is allowed to pass through an output of said first filter means; a second filter means for filtering said transmission signal such that said analog signal and said upper side and lower side digital signals are allowed to pass through an output of said second filter means; a third filter means for receiving an output of said second filter means and for outputting both said upper side digital signal and said lower side digital signal; a selecting unit for selecting either the output of said first filter means or the output of said second filter means to be furnished to said signal processing device; and a selection controller for receiving the output of said third filter means and for determining receive levels of said upper side digital signal and said lower side digital signal to control a selecting operation of said selecting unit according to the determined receive levels.