Interference signal compensating

Claim 3

The method according to claim 1, further comprising the steps of passing the picture signals in digital form occurring during the first scanning of the standard original scene to a first input point of a comparator, then through a gate circuit to a storage unit and then to one input point of a subtraction switch, passing a value from the storage unit to another input point of the subtraction circuit and to a second input point of the comparator, passing a signal from the comparator to a control input point of the gate circuit, and thereby recording a signal occurring at the first input point of the comparator in the storage unit by way of the gate circuit when that signal is greater than a signal occurring at the second input point.

Claim 4

Field scanning interference signal compensating apparatus comprising: input means for receiving picture signals derived by scanning a standard original scene, integrating means connected to the input means for integrating signals from scanned areas, storing means connected to the input means for storing the integrated picture signals, adjusting means responsive to the stored picture signals for compensating corresponding picture signals derived by scanning a non-standard original scene, analog-to-digital converter means connected to the integrating means for converting the integrated signals to digital pulses and wherein the storage means is a digital storage means for storing the digital integrated signals, maximum value storage means connected to the converter means for storing a maximum digital value for each picture area and comparing means connected to the maximum value storage means for comparing newly obtained values with previously stored maximums and for thereby adjusting the maximum values to include applicable newly obtained values and determininG the resulting differences.

Claim 5

Field scanning interference signal compensating apparatus comprising: input means for receiving picture signals derived by scanning a standard original scene, integrating means connected to the input means for integrating signals from scanned areas, storing means connected to the input means for storing the integrated picture signals, adjusting means responsive to the stored picture signals for compensating corresponding picture signals derived by scanning a non-standard original scene, analog-to-digital converter means connected to the integrating means for converting the integrated signals to digital pulses and wherein the storage means is a digital storage means for storing the digital integrated signals, maximum value storage means connected to the converter means for storing a maximum digital value for each picture area and comparing means connected to the maximum value storage means for comparing newly obtained values with previously stored maximums and for thereby adjusting the maximum values to include applicable newly obtained values and determininG the resulting differences.

Claim 6

Field scanning interference signal compensating apparatus comprising input means for receiving picture signals derived by scanning a standard original scene, storing means connected to the input means for storing the received picture signals, and adjusting means responsive to the stored picture signals for compensating corresponding picture signals derived by scanning a non-standard original scene, and further comprising a plurality of successive switch-controlled capacitors, a first switch connected to the input for selectively charging and reading the capacitors, a converter connected to the first switch for converting currents from the capacitors to digital values, a maximum value storage connected to the converter for storing maximum digital values from the converter, a comparator connected to the converter and to the maximum storage for comparing a new value with the stored maximum, a gate connected to the comparator, converter and the maximum storage for inserting new maximums in the storage from the comparator, a subtraction unit connected to the maximum storage and to the converter, wherein the storing means comprises a circulating storage and further comprising a storage switch connected between the circulating storage and the subtraction unit for selectively inserting difference values from the unit to the circulating storage.

Claim 7

Field scanning interference signal compensating apparatus comprising input means for receiving picture signals derived by scanning a standard original scene, storing means connected to the input means for storing the received picture signals, and adjusting means responsive to the stored picture signals for compensating corresponding picture signals derived by scanning a non-standard original scene, and further comprising a plurality of successive switch-controlled capacitors, a first switch connected to the input for selectively charging and reading the capacitors, a converter connected to the first switch for converting currents from the capacitors to digital values, a maximum value storage connected to the converter for storing maximum digital values from the converter, a comparator connected to the converter and to the maximum storage for comparing a new value with the stored maximum, a gate connected to the comparator, converter and the maximum storage for inserting new maximums in the storage from the comparator, a subtraction unit connected to the maximum storage and to the converter, wherein the storing means comprises a circulating storage and further comprising a storage switch connected between the circulating storage and the subtraction unit for selectively inserting difference values from the unit to the circulating storage.

Claim 8

The apparatus of claim 4 further comprising a grounding switch connected between the first switch and the capacitors for grounding the capacitors following connection to the converter.

Claim 9

The apparatus of claim 4 further comprising a second storage switch connected to the first storage switch and to first and intermediate positions of the circulating storage.