| 摘要 |
A noise error correcting and excessive noise error rejection system for use preferably in an identification interrogation system in which a scanned or swept frequency spectrum is transmitted and certain discrete frequencies are reradiated depending upon the frequency of tuned circuits located on the object to be identified. The system uses a constant number of bits out of a larger number of bit positions for all symbols or digits used. A check for excessive noise is made by counting the number of bits per digit or symbol received on a first sweep. Excessive noise is defined as a predetermined excess of bits in a predetermined number of digits. On a second sweep, the data received on the first sweep is corrected and further checks to insure accuracy are made.
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