DEVICE FOR TRANSFORMING FREQUENCY WITH ACTIVE FILTERING CHARACTERISTIC

摘要

PURPOSE: A device for transforming a frequency is provided to eliminate a noise existing in a corresponding channel and an interference formed by an adjacent channel for improving a telephone calling quality. CONSTITUTION: An interactive mobile communication trunk system being operated according to a multichannel frequency transforming method comprises: a frequency transformer(10) for transforming a high frequency signal inputted from the outside to a middle frequency signal and transiting variably the central frequency of the transformed middle frequency signal by a controlling signal for filtering and outputting the transient middle frequency signal; and a controller(20) being received a feedback of the middle frequency signal outputted from the frequency transformer for detecting an interference of an adjacent channel or a noise existing in a specific channel and outputting a controlling signal to the frequency transformer according to the location of the interference or the noise.