发明名称 |
FADING DETECTION MEANS, FADING DETECTION METHOD USED FOR THE SAME, AND HIGH FREQUENCY RECEIVER USING THE FADING DETECTION MEANS |
摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem that a conventional fading detection means takes a long fading detection time when a fading frequency is low. <P>SOLUTION: A fading detection method disclosed herein includes: a sampling step 103 for acquiring a signal level of a received signal detected by a detector for a predetermined time and storing the acquired level to a memory; a variation amount calculation step 104 for calculating a variation amount of a plurality of consecutive levels stored in the memory thereafter; and a count step 105 for counting the number of times of discrimination results of the variation amount to be lower than a predetermined threshold value for the predetermined time above thereafter, and since the fading frequency can be detected without the need for measuring a time between bottoms of the frequency waveform in this way, the detection time can be reduced even when the fading frequency is small. <P>COPYRIGHT: (C)2007,JPO&INPIT |
申请公布号 |
JP2007221641(A) |
申请公布日期 |
2007.08.30 |
申请号 |
JP20060042155 |
申请日期 |
2006.02.20 |
申请人 |
MATSUSHITA ELECTRIC IND CO LTD |
发明人 |
KITAZAWA KEIICHI |
分类号 |
H04B7/08;H04B1/10;H04B7/26;H04B17/00 |
主分类号 |
H04B7/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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