US4730210A — Wideband analog RGB video processor with negative…

Claim 1

Independent Claim 177 words

A wideband analog RGB video processor comprising: gain control means including voltage-to-current conversion means for converting recieving color video voltage component signals to color video current component signals and amplifier means for adjustably amplifying said color video current component signals; current-to-voltage conversion means for converting said amplified color video current component signals to color video voltage component signals for use with driving color video display means, said conversion means including combining means for combining said amplified video current component signals with correction current signals; video output circuit means for amplifying said color video voltage component signals and outputting said amplified signals to drive color video display means and having at least one node at which a relatively low voltage level signal typically is present; and feedback means coupled to receive said voltage level signal and a reference signal to process said signals and to provide said correction current signals, and adapted to receive a periodic gating signal corresponding to the scan retrace intervals during which video is not present to control the operation of said feedback means.

Claim 2

Dependent Claim 177 words

A wideband analog RGB video processor comprising: gain control means including voltage-to-current conversion means for converting recieving color video voltage component signals to color video current component signals and amplifier means for adjustably amplifying said color video current component signals; current-to-voltage conversion means for converting said amplified color video current component signals to color video voltage component signals for use with driving color video display means, said conversion means including combining means for combining said amplified video current component signals with correction current signals; video output circuit means for amplifying said color video voltage component signals and outputting said amplified signals to drive color video display means and having at least one node at which a relatively low voltage level signal typically is present; and feedback means coupled to receive said voltage level signal and a reference signal to process said signals and to provide said correction current signals, and adapted to receive a periodic gating signal corresponding to the scan retrace intervals during which video is not present to control the operation of said feedback means.

Claim 3

Dependent Claim 19 words

The wideband analog RGB video processor of claim 1 wherein said combining means comprises a low input impedance device.

Claim 4

Dependent Claim 93 words

The video processing system of claim 1 wherein said feedback means comprises: reference signal means for providing a reference signal: comparator means adapted to receive a signal representative of said color video voltage component signal and coupled to said reference signal means to receive said reference signal, said comparator means producing a differential signal representative of the difference between the compared signals; and correction signal means coupled to said comparator means to receive said differential signal to produce a correction signal which is representative of the magnitude and polarity of said differential signal.

Claim 5

Dependent Claim 18 words

The system of claim 3 wherein said signal reference means is adjustable to provide variable, determinable reference signals.

Claim 6

Dependent Claim 61 words

The system of claim 3 wherein said comparator means and said correction means are high impedance devices and further including: signal storage means coupled to recieve said differential signal to store a correction voltage derived from said differntial signal between said gating signals and provide said differential signal to said correction signal means during the time interval between said gating signals.

Claim 7

Dependent Claim 14 words

The system of claim 5 wherein said signal storage means comprises a storage capacitor.

Claim 8

Independent Claim 167 words

A method for providing wideband analog RGB processing comprising: converting receiver R, G and B component video voltage signals into R, G and B component video current signals; amplifying said R, G and B component video current signals to provide a desired gain; converting said amplified R, G and B component video current signals into R, G and B component video voltage signals; amplifying said R, G and B component video voltage signals to generate R, G and B output signals for driving video display means; providing a feedback signal from a low voltage signal representative of said R, G and B component video voltage signals soleley during scan retrace intervals during which video is not present; comparing said feedback signal with a reference signal to generate a variable DC correction current; combining said correction current with said R, G and B component video current signals before said conversion of said R, G and B component current video signals into R, G and B video voltage signals.

Claim 9

Independent Claim 167 words

A method for providing wideband analog RGB processing comprising: converting receiver R, G and B component video voltage signals into R, G and B component video current signals; amplifying said R, G and B component video current signals to provide a desired gain; converting said amplified R, G and B component video current signals into R, G and B component video voltage signals; amplifying said R, G and B component video voltage signals to generate R, G and B output signals for driving video display means; providing a feedback signal from a low voltage signal representative of said R, G and B component video voltage signals soleley during scan retrace intervals during which video is not present; comparing said feedback signal with a reference signal to generate a variable DC correction current; combining said correction current with said R, G and B component video current signals before said conversion of said R, G and B component current video signals into R, G and B video voltage signals.

Claim 10

Dependent Claim 30 words

The method of claim 7 wherein individual R, G and B feedback signals are provided, whereby individual correction currents are generated for each R, G or B video component signal.

Claim 11

Dependent Claim 230 words

A wideband analog RGB video processor comprising: gain control means including, voltage-to-current conversion means for converting received individual R, G and B voltage signals into individual R, G and B current signals and amplifying means coupled to said conversion means for providing desired gain for individual R, G and B current signals; combining means for combining said individual R, G and B current signals with individual correction current signals, said combining means including current-to-voltage conversion means for converting said combined individual R, G and B current signals to produce voltage signals; video output means coupled to said combining means for producing individual R, G and B output signals to drive desired color video display means and having at least one node at which a relatively low voltage level signal representative of said R, G and B output signals typically is present; and feedback means coupled to said low voltage node to provide a feedback signal for coordinating said output voltage signals with said individual R, G and B current signals, said feedback means including voltage-to-current conversion means for providing individual R, G and B correction current signals and signal reference means, whereby the individual R, G and B current correction signals may be controlled by adjusting said signal reference, said feedback means is controlled by periodic gating signals corresponding to a scan retrace interval during which video is not present.

Claim 12

Dependent Claim 230 words

A wideband analog RGB video processor comprising: gain control means including, voltage-to-current conversion means for converting received individual R, G and B voltage signals into individual R, G and B current signals and amplifying means coupled to said conversion means for providing desired gain for individual R, G and B current signals; combining means for combining said individual R, G and B current signals with individual correction current signals, said combining means including current-to-voltage conversion means for converting said combined individual R, G and B current signals to produce voltage signals; video output means coupled to said combining means for producing individual R, G and B output signals to drive desired color video display means and having at least one node at which a relatively low voltage level signal representative of said R, G and B output signals typically is present; and feedback means coupled to said low voltage node to provide a feedback signal for coordinating said output voltage signals with said individual R, G and B current signals, said feedback means including voltage-to-current conversion means for providing individual R, G and B correction current signals and signal reference means, whereby the individual R, G and B current correction signals may be controlled by adjusting said signal reference, said feedback means is controlled by periodic gating signals corresponding to a scan retrace interval during which video is not present.

Claim 13

Dependent Claim 53 words

The wideband analog RGB video processor of claim 9 further comprising: linearizing means for interconnection with said plurality of gain control means for received individual R, G and B signals; and control means coupled to said linearizing means to provide overall contrast control to each of said individual R, G and B signals.

Claim 14

Dependent Claim 24 words

The wideband analog RGB video processor of claim 9 wherein said feedback means is a coupled to receive the output of said combining means.

Claim 15

Dependent Claim 203 words

A video processing system having a video output stage, including output driver means having at least one node at which a relatively low voltage level signal representative of the output voltage signal is typically present, and combining means for combining component video current signals with correction current signals for wideband RGB processing and having a feedback control means for providing optimum correction current signals comprising: voltage reference signal mans for providing a voltage reference signal; comparator means coupled to said low level node in said output stage and to said voltage reference means for comparing said representative output voltage signal at said low level voltage with said voltage reference signal to produce differential voltage signal representative of the difference between the compared signals; voltage-to-current conversion means for providing a correction current signal to said combining means, the magnitude and polarity of said correction current signal being representative of said differential voltage signal; said comparator means being adapted to receive periodic gating signals corresponding to scan retrace intervals during which no video is present to control said comparator means, whereby said low level, representative output voltage signal is compared to said voltage reference signal by said comparator means only during said scan retrace interval.

Claim 16

Dependent Claim 203 words

A video processing system having a video output stage, including output driver means having at least one node at which a relatively low voltage level signal representative of the output voltage signal is typically present, and combining means for combining component video current signals with correction current signals for wideband RGB processing and having a feedback control means for providing optimum correction current signals comprising: voltage reference signal mans for providing a voltage reference signal; comparator means coupled to said low level node in said output stage and to said voltage reference means for comparing said representative output voltage signal at said low level voltage with said voltage reference signal to produce differential voltage signal representative of the difference between the compared signals; voltage-to-current conversion means for providing a correction current signal to said combining means, the magnitude and polarity of said correction current signal being representative of said differential voltage signal; said comparator means being adapted to receive periodic gating signals corresponding to scan retrace intervals during which no video is present to control said comparator means, whereby said low level, representative output voltage signal is compared to said voltage reference signal by said comparator means only during said scan retrace interval.

Claim 17

Dependent Claim 25 words

The system of claim 12 wherein said voltage signal reference means of said feedback control means is adjustable to provide variable, determinable voltage reference signals.

Claim 18

Dependent Claim 66 words

The system of claim 12 wherein said comparator means and said voltage-to-current conversion means of said feedback control means are high impedance devices and further including: signal storage means coupled to receive said differential voltage signal to store a correction voltage derived from said differential voltage signal between said gating signals and provide said differential voltage signal to said voltage-to-current conversion means between said gating signals

Claim 19

Dependent Claim 189 words

In a wideband RGB video processing system utilizing video components current signals for signal processing and video component voltage signals for output and having a video output stage, an improved feedback control circuit for providing correction current signals comprising: variable voltage reference signal means for providing variable, determinable voltage reference signals; gated comparator means coupled to said output stage to receive low voltage output signals and coupled to said voltage reference signal means for receiving said variable voltage reference signals and adapted to receive a gating pulse signal corresponding to the scan retrace interval during which no video is present in the video signal to compare said low voltage representative video component output signals to said variable voltage reference signals only during said scan retrace interval to produce a correction voltage signal representative of the difference between the compared signals; voltage to current conversion means coupled to recieve said differential voltage signal for providing a correction current signal, the magnitude and polarity of said correction current signal being representative of said differential voltage signal; and combining means for combining said correction current signal with said video component current signals.

Claim 20

Dependent Claim 189 words

In a wideband RGB video processing system utilizing video components current signals for signal processing and video component voltage signals for output and having a video output stage, an improved feedback control circuit for providing correction current signals comprising: variable voltage reference signal means for providing variable, determinable voltage reference signals; gated comparator means coupled to said output stage to receive low voltage output signals and coupled to said voltage reference signal means for receiving said variable voltage reference signals and adapted to receive a gating pulse signal corresponding to the scan retrace interval during which no video is present in the video signal to compare said low voltage representative video component output signals to said variable voltage reference signals only during said scan retrace interval to produce a correction voltage signal representative of the difference between the compared signals; voltage to current conversion means coupled to recieve said differential voltage signal for providing a correction current signal, the magnitude and polarity of said correction current signal being representative of said differential voltage signal; and combining means for combining said correction current signal with said video component current signals.

Claim 21

Dependent Claim 64 words

The improved feedback control circuit of claim 15 wherein said comparator means and said voltage-to-current conversion means are high impedance devices and further including: signal storage coupled to receive said differential voltage signal to store a correction voltage signal derived from said differential voltage signal between said gating signals and provide said correction voltage signal to said voltage-to-current conversion means between said gating signals.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1991-03-08	1991-09-07	1992-03-08	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1995-03-08	1995-09-07	1996-03-08	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1999-03-08	1999-09-07	2000-03-08	$7700.00	Window Closed / Lapsed

Wideband analog RGB video processor with negative feedback capability and black level control

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