发明名称 |
Peak and valley detector for a selective call receiving device |
摘要 |
A peak and valley detection system and method are shown for a selective call receiving device (10). The peak and valley detection system quickly and accurately detects and tracks to the peak and valley of a two level and/or four-level signal. A signal value representing a received signal is compared by a CPU (28) to the sum of a peak variable and attack constant. The peak variable is updated to a first value if the received signal value is less than the sum and is updated to a second value if the received signal value is not less than the sum. Similarly, the received signal is compared by the CPU (28) to a difference between a valley variable and attack constant. The valley variable is updated to a third value if the received signal value is greater than the difference value and updated to a fourth value if the received signal value is not greater than the difference value. The peak and valley variables attack and decay at non-constant rates and independently of one another.
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申请公布号 |
US5627860(A) |
申请公布日期 |
1997.05.06 |
申请号 |
US19950456510 |
申请日期 |
1995.06.01 |
申请人 |
MOTOROLA, INC. |
发明人 |
MCKINNY, CAROL A.;RAUSCH, CHRISTOPHER B.;OLIBONI, MARK L.;WHITAKER, MARK R.;BABCOCK, MARK H.;HOANG, TUAN S. |
分类号 |
H04L25/06;H04W88/02;(IPC1-7):H04L25/06 |
主分类号 |
H04L25/06 |
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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