Patent ID: 8243958

Claim:
A receiver for making an earphone cord of an earphone function as an earphone antenna, comprising: a receiver circuit for receiving a broadcast wave signal received at said earphone cord of said earphone and outputting an audio signal; an earphone jack into which a earphone plug is inserted; a first detector circuit for detecting whether said earphone is one of stereo and monaural functionalities; and a second detector circuit for detecting said earphone being connected to said receiver; said earphone jack having an antenna terminal; left channel audio terminal and right channel audio terminal; a first detection terminal and a second detection terminal; and a ground terminal; wherein said antenna terminal is connected to an antenna input end of said receiver circuit through a coupling capacitor; said left channel audio terminal and said right channel audio terminal are connected to audio output ends of said receiver circuit through a first high-frequency choke coil and a second high-frequency choke coil, respectively; said first detection terminal and said second detection terminal are connected to input ends of said first detector circuit and said second detector circuit through a third high-frequency choke coil and a fourth high-frequency choke coil; at least one of said first detection terminal and said second detection terminal is connected to ground through a bypass capacitor; said ground terminal is connected to ground; a broadcast wave signal received at said earphone cord is supplied to said receiver circuit through said antenna terminal and said coupling capacitor; and at least one of said first detection terminal and said second detection terminal is grounded in a high-frequency manner through said bypass capacitor.