Method and apparatus for detecting a dead zone in the transfer f

Details Method and apparatus for detecting a dead zone in the transfer f Method and apparatus for detecting a dead zone in the transfer f

1985-04-12

1986-11-25

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328188, 330 2, 358184, 360 25, 375 10, 455 67, H04N 1700, H04N 1706, H04B 1700

Patent

active

046252380

ABSTRACT:
A dead zone in the transfer function of a signal processing system, such as a VTR, is detected by impressing on the system a test signal that is formed within a predetermined interval from a sinusoidal waveform modulated by an envelope function that reduces to zero at a predetermined time. The existence of the dead zone is detected by observing whether the corresponding output signal of the signal processing system has a constant amplitude at times other than the time at which the envelope function is zero.

REFERENCES:
patent: 3427558 (1969-02-01), McCutcheon
patent: 3434065 (1969-03-01), Chu
patent: 4364080 (1982-12-01), Vidovic
patent: 4414568 (1983-11-01), Cluniat
patent: 4581639 (1986-04-01), Judge
patent: 4583233 (1986-04-01), Barrows

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