Self-tracking noise suppressing circuit

Claim 2

In a video signal apparatus having a first amplifier stage coupled to a video signal source and to a second amplifier stage, a self-tracking noise signal suppressing circuit comprising: an electron device having first and second signal input electrodes and a signal output electrode; means for coupling said first signal input electrode to said coupled first and second amplifier stages; circuit means including a series connected unidirectional conduction device and capacitor coupling said second signal input electrode to a potential reference level and an impedance coupling said input electrode to said coupled first and second amplifier stages; and means for coupling said signal output electrode to said coupled video signal source and first amplifier stage whereby said unidirectional conduction device and capacitor tend to clamp said electron device to a given level of applied signal and said output electrode provides an output signal for cancelling noise signals above said given level of said applied signal.

Claim 3

The noise signal suppressing circuit of claim 1 wherein said circuit means includes a second impedance coupling the junction of said series connected unidirectional conduction device and capacitor to said first and second amplifier stages.

Claim 4

The noise signal suppressing circuit of claim 2 wherein said second impedance is a resistor.

Claim 5

The noise signal suppressing circuit of claim 1 wherein said first and second amplifier stages are video signal amplifier stages, said video signal source provides video signals which include noise signals of a given polarity and said output electrode of said noise signal suppressing circuit provides noise signals of a polarity opposite to said given polarity whereby cancellation of said noise signals in said video signals is effected.

Claim 6

The noise signal suppressing circuit of claim 1 wherein said means for coupling said signal output electrode to said coupled video signal source and first amplifier stage includes a third impedance coupling said output electrode to a potential reference level and a noise signal amplifier stage coupling said output electrode to said coupled video signal source and first amplifier stage.

Claim 7

In a television receiver having video signal apparatus including a video signal source providing video signals which may include undesired noise signals and a first video signal amplifier stage coupling the video signal source to a second video signal amplifier stage, a self-tracking noise signal suppressing circuit comprising: transistor means having emitter, base, and collector electrodes; circuit means directly coupling said emitter electrode to said coupled first and second video signal amplifier stages; peak detecting and signal averaging circuit means coupling said base electrode to a potential reference level and to said coupled first and second video signal amplifier stages, said circuit means including a series connected diode and capacitor coupling said base electrode to said potential reference level, a first impedance coupling said base electrode to said coupled first and second video signal amplifier stages, and a second impedance coupling the junction of said series connected diode and capacitor to said coupled first and second video signal amplifier stages; and feedback circuit means coupling said collector electrode to said coupled video signal source and first video signal amplifier stage.

Claim 8

In a television receiver having video signal apparatus including a video signal source providing video signals which may include undesired noise signals and a first video signal amplifier stage coupling the video signal source to a second video signal amplifier stage, a self-tracking noise signal suppressing circuit comprising: transistor means having emitter, base, and collector electrodes; circuit means directly coupling said emitter electrode to said coupled first and second video signal amplifier stages; peak detecting and signal averaging circuit means coupling said base electrode to a potential reference level and to said coupled first and second video signal amplifier stages, said circuit means including a series connected diode and capacitor coupling said base electrode to said potential reference level, a first impedance coupling said base electrode to said coupled first and second video signal amplifier stages, and a second impedance coupling the junction of said series connected diode and capacitor to said coupled first and second video signal amplifier stages; and feedback circuit means coupling said collector electrode to said coupled video signal source and first video signal amplifier stage.

Claim 9

The noise signal suppressing circuit of claim 6 wherein said first and second impedances are in the form of resistors.

Claim 10

The noise signal suppressing circuit of claim 6 wherein said video signal source provides video signals having a given polarity and said feedback circuit means effects application of signals having a polarity opposite to said given polarity to said coupled video signal source and first video signal amplifier stage.

Claim 11

In video signal apparatus having a series connected video signal source And first and second video amplifier stages, self-tracking noise signal suppressing and sync pulse separation circuitry comprising: noise signal suppressing circuitry having amplifier means with a first input circuit coupled to said first and second video amplifier stages, a second input circuit coupled via a series connected unidirectional conduction device and capacitor to a potential reference level and by an impedance to said first and second video amplifier stages, and an output circuit coupled via a feedback means to said video signal source and first video amplifier stage; and sync pulse separation means coupled to said first and second video amplifier stages and to said output circuit of said noise signal suppressing circuitry whereby said sync pulse separation means is disabled upon application of an amplified noise signal thereto from said amplifier means of said noise signal suppressing circuitry.

Claim 12

In video signal apparatus having a series connected video signal source And first and second video amplifier stages, self-tracking noise signal suppressing and sync pulse separation circuitry comprising: noise signal suppressing circuitry having amplifier means with a first input circuit coupled to said first and second video amplifier stages, a second input circuit coupled via a series connected unidirectional conduction device and capacitor to a potential reference level and by an impedance to said first and second video amplifier stages, and an output circuit coupled via a feedback means to said video signal source and first video amplifier stage; and sync pulse separation means coupled to said first and second video amplifier stages and to said output circuit of said noise signal suppressing circuitry whereby said sync pulse separation means is disabled upon application of an amplified noise signal thereto from said amplifier means of said noise signal suppressing circuitry.

Claim 13

The circuitry of claim 9 wherein said sync pulse separation means includes sync pulse separation and noise signal switching electron devices coupled to a common DC reference potential level with said noise signal switching electron device coupled to said amplifier means of said noise signal suppressing circuitry.

Claim 14

The circuitry of claim 9 wherein said sync pulse separation means includes a noise signal switching electron device coupled intermediate a potential source and a DC reference potential level and via an impedance to said noise signal suppressing circuitry.

Claim 15

The circuitry of claim 9 wherein said sync pulse separation means includes sync pulse separation and noise signal switching electron devices in the form of transistors having output electrodes coupled to a potential source and input electrodes coupled in common to an impedance connected to a potential reference level.