Multiple simultaneous tone decoder

Details Multiple simultaneous tone decoder Multiple simultaneous tone decoder

1982-08-30

1984-06-19

Malzahn, David H.

Boots, shoes, and leggings

364825, 179 84VF, G06F 1531, H04M 150

Patent

active

044556179

ABSTRACT:
The invention is a decoder for decoding serially received signals. The decoder includes circuitry for calculating the period of each signal in a group of the serially received signals. The decoder averages the periods of the group and calculates the groups average variance. Additional circuitry in the decoder calculates an average variance threshold. Detection circuitry within the decoder takes the average period, the average variance and the average variance threshold of the group of signals and produces a detection signal when the average period remains constant and the average variance remains below the average variance threshold for a predetermined minimum time period.

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patent: 4328398 (1982-05-01), Kawaguchi et al.
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