Input signal determining method and apparatus

Details Input signal determining method and apparatus Input signal determining method and apparatus

1997-03-17

1999-01-05

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By presence or absence pulse detection

327 20, H03K 500

Patent

active

058567470

ABSTRACT:
In an input signal determining method and an apparatus for practicing the method, the level of an input signal is detected at least twice with a predetermined period, if the level of the input signal is significant when detected firstly, then before the second detection is started which is carried out in the predetermined period, whether or not the input signal is a continuous input signal whose level is maintained unchanged for a predetermined time is determined, and if the input signal is not the continuous input signal, the result of the first detection is reset, and if the level of the input signal is maintained for the predetermined time, and the level of the input signal is significant when detected secondly, then the input signal is determined as a correct input signal, whereby the erroneous recognition of the input signal can be avoided, and a noise equal in period to the synchronizing signal can be eliminated.

REFERENCES:
patent: 4475219 (1984-10-01), Puckette
patent: 5257287 (1993-10-01), Blumenthal et al.

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