Portable radio terminal and AFC control method
AssigneeNEC Corporation
InventorsMariko Matsumoto, Shigeru Ono
Life of this patent
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Abstract
A portable radio terminal for realizing automatic frequency control (AFC) for automatically controlling the oscillation frequency of an oscillator includes a unit for intermittently performing AFC operation, and a unit for shortening an AFC operation stop period when the frequency shift of the oscillation frequency is large. An AFC control method is also disclosed.
Claims13
A portable radio terminal for realizing automatic frequency control (AFC) for automatically controlling an oscillation frequency of an oscillator, comprising:
- means for intermittently performing AFC operation;
- and
- means for shortening an AFC operation stop period when a frequency shift of the oscillation frequency is greater than a first threshold value;
- means for lengthening the AFC operation stop period when the frequency shift of the oscillation frequency is less than a second threshold value;
- and
- means for maintaining the AFC operation stop period at a current value when the frequency shift of the oscillation frequency is a value that is less than the first threshold value and greater than the second threshold value,
- wherein the first threshold value is greater than the second threshold value.
An AFC control method of realizing automatic frequency control (AFC) for automatically controlling an oscillation frequency of an oscillator, comprising:
- intermittently performing AFC operation,
- wherein, when a frequency shift of the oscillation frequency is greater than a first threshold value, shortening an AFC operation stop period,
- wherein, when the frequency shift of the oscillation frequency is less than a second threshold value, lengthening the AFC operation stop period, and
- wherein, when the oscillation frequency is a value that is less than the first threshold value and greater than the second threshold value, the AFC operation stop period is maintained at a current value,
- wherein the first threshold value is greater than the second threshold value.
Dependencies are inferred from the claim text.