Inventor

HARWOOD LEOPOLD A

US55 patents

⚠️ This page may combine multiple inventors who share the name “HARWOOD LEOPOLD A”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

HARWOOD LEOPOLD A

RCA CORP

Interfield image motion detector for video signals

Video signal motion detecting apparatus

Adaptive control of the chrominance signal frequency response in a video signal processing system

Chrominance signal phase locked loop system for use in a digital television receiver having a line-locked clock signal

Digital phase locked loop stabilization circuitry using a secondary digital phase locked loop

Phase locked loop system including analog and digital components

Signal background noise detector

Automatic kinescope beam current limiter with sequential control modes

Brightness control circuit employing a closed control loop

Frequency division multiplexed analog to digital converter

Manual hue control as for a digital TV

Controlled output composite keying signal generator for a television receiver

Amplifier incorporating gain distribution control for cascaded amplifying stages

Adjustable coring circuit

Television receiver with selectively disabled on-screen character display system

Circuit for linearly gain controlling a differential amplifier

Brightness control circuit

Clamping arrangement for a video signal peaking system

Transistor protection circuit

Stabilized automatic brightness control network in a video signal processing system including an automatic kinescope beam current limiter

Automatic kinescope bias control circuit

Vertical detail information restoration circuit

Television receiver with selectable video input signals

Television receiver responsive to plural video signals

Digital chroma overload system

Signal filtering system having adaptively cascaded filter stages for developing a variable bandwidth frequency characteristic

Video signal auto peaking circuitry

Video signal peaking control system with provision for automatic and manual control

Filter and phase shift circuit for a television automatic flesh color correction system

Electronic filter for generating a third harmonic signal

Signal detector including sample and hold circuit with reduced offset error

Automatic brightness control circuit employing a closed control loop stabilized against disruption by large amplitude video signals

Motion adaptive television signal processing system

Predictable automatic brightness control circuit in a video signal image reproducing system

I-phase fleshtone correction system using R-Y, G-Y and B-Y color difference signal demodulators

Chrominance processor control system

Hue control system

PLL Oscillator synchronizing system with DC control of free-running frequency

High voltage protection for an output circuit

Stabilized video signal control loop

Color-difference signal processing circuits

Frequency selective DC coupled video signal control system insensitive to video signal DC components

Symmetrically gain controlled differential amplifier

Phase compensated controlled oscillator

Digital correlation indicator and hanging dot reduction system employing same

Vertical transition processor for a comb filter

Duration-sensitive digital signal gate

Hanging dot reduction system

PAL switching control circuit

THOMSON SA

System for applying brightness signals to a display device and comparator therefore