| 摘要 |
<p>PURPOSE: A device for removing an external interference signal of a CDMA terminal is provided to increase a speech quality by removing an external interference signal transmitted by an AMPS(advanced mobile phone service) base station. CONSTITUTION: An interference detecting part(15) decides an interference degree through a rate of a mean transmission energy per a pseudo noise chip in a received signal strength, a pilot channel, a sink channel, a paging channel, a forwarding channel, and a power control channel or through a frame error rate according to a service option 2 in a forwarding traffic channel. Switches(211 to 21n) are switched according to a result of a performance of the interference detecting part(15), and a gain of a front stage of a low pass filter(13) is varied. Finally, when an external interference is increased, a control voltage is increased proportional to an increased quantity. An attenuation quantity is increased so much, and the external interference is decreased.</p> |
