NOISE CANCELLATION SERVICE METHOD IN MOBILE COMMUNICATION, ESPECIALLY CONCERNED WITH PREVIOUSLY REGISTERING A USER'S VOICE IN THE CLIENT MANAGER SERVER OF A MOBILE COMMUNICATION COMPANY AND EXTRACTING AND TRANSMITTING THE USER'S STORED VOICE AFTER REMOVING NOISE IN THE CASE OF EXECUTING A MOBILE CALL

PURPOSE: A noise cancellation service method in mobile communication is provided to execute a clear call in a noisy place by previously storing a user' voice in the client management server of a mobile communication company and extracting the user's stored voice only in the case of mobile phone conversation. CONSTITUTION: In case that a transmitter makes a call to a receiver through his mobile terminal, a call connection signal is transferred to a transmitting-side base station. The base station transmits a call signal and subscriber information to a mobile switching center. The mobile switching center searches for subscriber information through a VLR and an HLR. At this moment, the mobile switching center scans the subscriber information stored in the client management server of a mobile communication company and confirms whether the transmitter is a noise cancellation service subscriber. In case that the transmitter is a noise cancellation service subscriber, the mobile call is executed through a VAD(Voice Activity Detection) system(210). The VAD system(210) removes surrounding noise and extracts the user's voice only.