发明名称 |
Selective calling decoder |
摘要 |
There is disclosed an aircraft selective calling decoder for decoding individual signal tones used in selectively signaling communication of a particular aircraft. The decoder is associated with a channel of receiving equipment in an aircraft and is responsive typically to a particular four-tone coded signal, the reception of which actuates the decoder indicating that an incoming communication is to be received. The decoder includes a dual path circuit which receives dual frequencies of each individual tone of the four-tone code and provides an output upon receipt of each tone for enabling the receiver following receipt of the proper four-tone code sequence. Filtering in each of the dual paths for each frequency of a tone is controlled by a microprocessor to eliminate the necessity for multiple individual filters.
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申请公布号 |
US4818989(A) |
申请公布日期 |
1989.04.04 |
申请号 |
US19840593792 |
申请日期 |
1984.03.27 |
申请人 |
ROCKWELL INTERNATIONAL CORPORATION |
发明人 |
WERTH, WILLARD F. |
分类号 |
H04W88/02;(IPC1-7):H04Q7/00 |
主分类号 |
H04W88/02 |
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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