Automatic frequency control system, operation control method...

Details Automatic frequency control system, operation control method... Automatic frequency control system, operation control method...

2006-04-11

2006-04-11

Le, Lana (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S182100, C455S255000, C455S192100

Reexamination Certificate

active

07027787

ABSTRACT:
In a mobile communication device, communication can be resumed upon next communication without causing problem even when an AFC control signal becomes abnormal upon interruption of communication. Locked state and unlocked state of an AFC portion is monitored by an AFC monitoring portion5.Upon interruption of communication, if in unlocked state, a TCXO1is controlled by the AFC portion using a TCXO control signal upon preceding locked state. By this, when communication failure is caused by influence of building, tunnel or the like or when communication is terminated, a reference frequency of the mobile communication device does not significantly offset from the reference frequency of a base station to facilitate communication upon next communication.

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