Interactive CRT with touch level set

Claim 2

In a touch control panel having a plurality of crossing energy paths and means for repetitively testing the energy levels in said paths against stored test levels for said paths to determine if an interruption, corresponding to a touch, has occurred, a method of updating the stored test levels for said paths comprising the steps of: energizing each of said paths in sequence; comparing the detected energy level in each of said paths with a nominal threshold level; A. (1) if the test indicates energy is detected, testing again with a maximum threshold level; (2) if at a maximum energy level, storing the maximum threshold level as the updated test level for that energy path; (3) if not at a maximum energy level, increasing the nominal threshold level and testing again; (4) continuing testing and increasing the threshold level until no energy is detected, and storing the last threshold level as the updated test level for that path; B. (1) if the test indicates no energy detected, testing for a minimum threshold level; (2) if at a minimum threshold level, storing the minimum threshold level as the updated test level for that path; (3) if the threshold level is not at a minimum, decreasing the threshold level by a predetermined amount; and (4) storing the decreased threshold level as the updated test level for that path.

Claim 3

The method of claim 1, further including the steps of: A. (5) decreasing the threshold level by a preselected amount when a change from energy detection to no energy detection occurs; and (6) storing the decreased threshold level as the updated test level for that path.

Claim 4

The method of claim 2, further including comparator means having one input supplied with a signal representative of the energy level in a path and another input supplied with a signal corresponding to the threshold level.

Claim 5

The method of claim 3, further including the steps of regularly and frequently repeating the steps in A and B and continually updating the stored test levels for said paths.

Claim 6

In a touch control panel system having a plurality of crossing energy paths and means for repetitively testing the energy levels in said paths against stored test levels for said paths to determine if an interruption, corresponding to a touch, has occurred and including comparator means having one input supplied with a signal representative of the energy level in a path and another input supplied with a signal corresponding to a threshold level, a method of updating the stored test levels comprising the steps of: energizing each of said paths in sequence; applying a signal representative of path energy level to said comparator means; applying a nominal threshold level signal to said comparator means; A. (1) if the comparison indicates energy detection in the path, testing again with a maximum threshold level signal applied to said comparator means; (2) if energy is still detected, storing the maximum threshold level as the test level for that energy path; (3) if energy is not detected, increasing the nominal threshold level and testing again; continuing testing with increased threshold levels until no energy is detected; (4) decreasing the threshold level by a preselected amount when a change from energy detection to no energy detection occurs; and (5) storing the last threshold level as the updated test level for that path; B. (1) if the comparison indicates no energy detection in the path, checking for a minimum threshold level; (2) if at a minimum threshold level, storing the minimum threshold level as the updated test level for that path; and (3) if the threshold level is not at a minimum, decreasing the threshold level by a predetermined amount; and (4) storing the decreased threshold level as the updated test level for that path.

Claim 7

In a touch control panel system having a plurality of crossing energy paths and means for repetitively testing the energy levels in said paths against stored test levels for said paths to determine if an interruption, corresponding to a touch, has occurred and including comparator means having one input supplied with a signal representative of the energy level in a path and another input supplied with a signal corresponding to a threshold level, a method of updating the stored test levels comprising the steps of: energizing each of said paths in sequence; applying a signal representative of path energy level to said comparator means; applying a nominal threshold level signal to said comparator means; A. (1) if the comparison indicates energy detection in the path, testing again with a maximum threshold level signal applied to said comparator means; (2) if energy is still detected, storing the maximum threshold level as the test level for that energy path; (3) if energy is not detected, increasing the nominal threshold level and testing again; continuing testing with increased threshold levels until no energy is detected; (4) decreasing the threshold level by a preselected amount when a change from energy detection to no energy detection occurs; and (5) storing the last threshold level as the updated test level for that path; B. (1) if the comparison indicates no energy detection in the path, checking for a minimum threshold level; (2) if at a minimum threshold level, storing the minimum threshold level as the updated test level for that path; and (3) if the threshold level is not at a minimum, decreasing the threshold level by a predetermined amount; and (4) storing the decreased threshold level as the updated test level for that path.