Mode discriminator for monitor

Details Mode discriminator for monitor Mode discriminator for monitor

1987-12-30

1989-06-06

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358149, 358150, 358153, H04N 504

Patent

active

048376213

ABSTRACT:
A mode discriminator for detecting a specific mode of horizontal synchronizing frequency applied to a display monitor includes first and second monostable multivibrators coupled to a vertical synchronizing signal associated with the horizontal synchronizing frequency. The discriminator detects the polarity of the vertical synchronizing signal to detemine whether the horizontal synchronizing frequency is of a first mode or a second mode in which the frequencies are different. Since the discriminator detects the polarity of vertical synchronizing signals and does not depend on the time difference between pulse widths of a horizontal synchronizing signal, reliability and performance are enhanced.

REFERENCES:
patent: 4608602 (1986-08-01), Grantham-Hill
patent: 4729023 (1988-03-01), Srivastava et al.

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