# Patent

## Title
Acoustical panel and method of making same

## Abstract

While the invention has been described with respect to several illustrative examples, it would be understood by those skilled in the art that modifications may be made without parting from the spirit and scope of the present invention. The embodiments presented above are for purposes of example only and are not to be taken to limit the scope of the appended claims.

## Background
## Claims

1. An improved stylus detection system having a transparent overlay with a transparent array of horizontal and vertical conductors, the horizontal conductors being spaced from the vertical conductors by an insulating material, a control processor, a radiative source for stylus detection, a switchable path to couple selected conductors to the radiative source in response to appropriate commands from the control processor and a stylus wherein: to receive measured radiative signal values of the conductors when the switchable path has connected a first pattern of conductors to the radiative source to detect the vertical and horizontal location of the stylus with respect to the overlay; means when the switchable path has connected a second pattern of conductors to the radiative source to detect the height of the stylus with respect to the overlay; and, respect to the overlay can be determined.

2. The improved stylus detection system as recited in claim 1 which further comprises: measure radiative signal values when the first pattern of conductors is connected to the radiative source to detect the vertical and horizontal location of the stylus with respect to the overlay.

3. The improved stylus detection system as recited in claim 1 which further comprises: a location on the overlay which produces a strongest radiative signal when the second pattern of conductors is connected to the radiative source to detect the height of the overlay with respect to the overlay.

4. The improved stylus detection system as recited in claim 3 which further comprises: measured radiative signal values when the second pattern of conductors is connected to the radiative source to detect the height of the overlay with respect to the overlay.

5. The improved stylus detection system as recited in claim 3 wherein the second pattern comprises connecting all of the horizontal and vertical conductors to the radiative source to produce the most uniform radiative signal across the overlay.

6. The improved stylus detection system as recited in claim 3 wherein the system labels a particular horizontal and vertical stylus location as a contact point if the compensated signal strength exceeds a contact threshold and labels a particular horizontal and vertical stylus location as a proximity point if the compensated signal strength is below the contact threshold.

7. The improved stylus detection system as recited in claim 1 wherein the stylus comprises: vertical overlay conductors to maintain the cross sectional area of the antenna which receives the radiated signals independent of the angle of the stylus with respect to the overlay; an outer surface substantially concentric with the spherical antenna to maintain the distance of the spherical antenna from the overlay independent of the angle of the stylus with respect to the overlay; and within the stylus, so that the radiated signal value received by the stylus is independent of the angle of the stylus with respect to the overlay.

8. The improved stylus detection system as recited in claim 7 wherein the stylus further comprises: make electrical contact with the spherical antenna; and, shielding.

9. An improved stylus detection system having a transparent overlay with a transparent array of horizontal and vertical conductors, the horizontal conductors being spaced from the vertical conductors by an insulating material, a control processor, a radiative source for stylus detection, a switchable path to couple selected conductors to the radiative source in response to appropriate commands from the control processor and a stylus, the stylus comprising: vertical overlay conductors to maintain the cross sectional area of the antenna which receives the radiated signals independent of the angle of the stylus with respect to the overlay; an outer surface substantially concentric with the spherical antenna to maintain the distance of the spherical antenna from the overlay independent of the angle of the stylus with respect to the overlay; and, within the stylus, so that the radiated signal value received by the stylus is independent of the angle of the stylus with respect to the overlay.

10. The improved stylus detection system as recited in claim 9 wherein the stylus further comprises: make electrical contract with the spherical antenna; and, shielding.

11. An improved method for stylus detection in a transparent overlay having a transparent array of horizontal and vertical conductors, the horizontal conductors being spaced from the vertical conductors by an insulating material, a control processor, a radiative source for stylus detection and a means for selecting and coupling conductors to the radiative source and a stylus to receive signals radiated by the overlay comprising the steps of; value received by the stylus; selecting a horizontal and a vertical conductor pair from which the stylus receives the highest strength signals; overlay; position of the stylus has been located, and if the stylus is determined to be within the predetermined height above the overlay; and, predetermined height above the overlay.

12. The improved method for stylus detection as recited in claim 11 wherein: each of the vertical and horizontal conductors to the radiative source; of conductors to the radiative source; and conductors to the radiative source.

13. The improved method for stylus detection as recited in claim 11 which further comprises the step of compensating for the nonlinearities of the measured radiative signal value when the first pattern is coupled to the radiative source.

14. The improved method for stylus detection as recited in claim 11 which further comprises the step of compensating for the distance of the stylus from a location on the overlay which produces a strongest radiative signal when the second pattern is coupled to the radiative source.

15. The improved method for stylus detection as recited in claim 14 which further comprises the step of compensating for the nonlinearities of the measured radiative signal values when the second pattern is coupled to the radiative source.

16. The improved method for stylus detection as recited in claim 11 wherein the stylus comprises: vertical overlay conductors to maintain the cross sectional area of the antenna which receives the radiated signals independent of the angle of the stylus with respect to the overlay; an outer surface substantially concentric with the spherical antenna to maintain the distance of the spherical antenna from the overlay independent of the angle of the stylus with respect to the overlay; and within the stylus, so that the radiated signal value received by the stylus is independent of the angle of the stylus with respect to the overlay.