发明公开
EP0985304A1 CARRIER RECOVERY IN DAB RECIEVERS 失效
载波恢复在接收器数字TONRUNDFUNKSIGNALE

CARRIER RECOVERY IN DAB RECIEVERS
摘要:
A receiver is provided which can perform normal reception even under strict environments such as multi-path environments. A frequency offset detector (7) detects a frequency offset amount in accordance with a phase reference symbol. The detected frequency offset value is integrated by an integrator (17). The integrated value is compared by a comparator (18) with a predetermined threshold value range. If the integrated value output from the integrator is in the threshold value range, a frequency offset value amount detected by another frequency offset detector (8) in accordance with a phase difference of a delay-detection output is selected by a switch circuit (10). If the integrated value is not in the threshold value range, the frequency offset value detected by the frequency offset detector (7) is selected by the switch circuit (10). In accordance with each selected frequency offset value, automatic frequency control of the receiver is performed.
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