Distortion surveillance apparatus for television signal transmis

Details Distortion surveillance apparatus for television signal transmis Distortion surveillance apparatus for television signal transmis

1986-07-02

1989-01-10

George, Keith E.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 710

Patent

active

047977353

ABSTRACT:
In a transmission system of signals including amplitude-modulated television signals, a pilot signal of a specific amplitude is supplied at a first place in the transmission system, and at a second place in the transmission system, the pilot signal having been subjected to a cross modulation due to nonlinearity of the transmission system from the first place to the second place is extracted. A rectifier picks up an envelope of the cross modulated pilot signal. In consequence, out of the envelope, the fundamental wave component or a higher harmonic component of the horizontal scanning frequency of the transmitted television signal is extracted by using a filter of an extremely narrow band. By detecting the increase in the level of this removed signal, an increase in distortion due to an excessive level of the transmission signal which causes a problem in the transmission system is detected.

REFERENCES:
patent: 3862380 (1975-01-01), Hekimian et al.
patent: 3927281 (1975-12-01), Bradley
patent: 3978282 (1976-08-01), Fulton, Jr.
patent: 4365346 (1982-12-01), Froese et al.
patent: 4491968 (1985-01-01), Shimp et al.
patent: 4700222 (1987-10-01), Large et al.

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