Detection of a number of touch contacts of a multi-touch input
First Claim
Patent Images
1. A system for determining touch contact locations, comprising:
- a communication interface configured to receive a signal that has been disturbed by touch contacts of a touch input on a surface, wherein the signal was propagating in a medium of the surface prior to the touch input; and
a processor coupled with the communication interface and configured to;
correlate the received signal to determine a time domain signal encoding a time delay represented in the received signal;
transform the time domain signal to determine a spatial domain signal, wherein transforming the received signal includes translating the time delay represented in the received signal disturbed by the touch input to a physical distance encoded in the spatial domain signal;
compare the spatial domain signal with an expected signal associated with potential locations of sources of disturbances caused by the touch contacts, wherein the spatial domain signal encodes the physical distance traveled by the received signal due to the disturbance caused by the touch input and the expected signal encodes a variable with respect to a measure of distance;
determine the locations of the touch contacts of the touch input based at least in part on the comparison.
1 Assignment
0 Petitions
Accused Products
Abstract
Determining touch contact locations is disclosed. A signal that has been disturbed by touch contacts of a touch input on a surface is received. The received signal is transformed to determine a spatial domain signal. The spatial domain signal is compared with an expected signal associated with potential locations of sources of disturbances caused by the touch contacts. The locations of the touch contacts of the touch input are determined based at least in part on the comparison.
-
Citations
19 Claims
-
1. A system for determining touch contact locations, comprising:
-
a communication interface configured to receive a signal that has been disturbed by touch contacts of a touch input on a surface, wherein the signal was propagating in a medium of the surface prior to the touch input; and a processor coupled with the communication interface and configured to; correlate the received signal to determine a time domain signal encoding a time delay represented in the received signal; transform the time domain signal to determine a spatial domain signal, wherein transforming the received signal includes translating the time delay represented in the received signal disturbed by the touch input to a physical distance encoded in the spatial domain signal; compare the spatial domain signal with an expected signal associated with potential locations of sources of disturbances caused by the touch contacts, wherein the spatial domain signal encodes the physical distance traveled by the received signal due to the disturbance caused by the touch input and the expected signal encodes a variable with respect to a measure of distance; determine the locations of the touch contacts of the touch input based at least in part on the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A method for determining touch contact locations, comprising:
-
receiving a signal that has been disturbed by touch contacts of a touch input on a surface, wherein the signal was propagating in a medium of the surface prior to the touch input; correlating the received signal to determine a time domain signal encoding a time delay represented in the received signal; transforming the time domain signal to determine a spatial domain signal, wherein transforming the received signal includes translating the time delay represented in the received signal disturbed by the touch input to a physical distance encoded in the spatial domain signal; using a processor to compare the spatial domain signal with an expected signal associated with potential locations of sources of disturbances caused by the touch contacts, wherein the spatial domain signal encodes the physical distance traveled by the received signal due to the disturbance caused by the touch input and the expected signal encodes a variable with respect to a measure of distance; and determining the locations of the touch contacts of the touch input based at least in part on the comparison.
-
-
19. A computer program product for determining touch contact locations, the computer program product being embodied in a non-transitory computer readable storage medium and comprising computer instructions for:
-
receiving a signal that has been disturbed by touch contacts of a touch input on a surface, wherein the signal was propagating in a medium of the surface prior to the touch input; correlating the received signal to determine a time domain signal encoding a time delay represented in the received signal; transforming the time domain signal to determine a spatial domain signal, wherein transforming the received signal includes translating the time delay represented in the received signal disturbed by the touch input to a physical distance encoded in the spatial domain signal; comparing the spatial domain signal with an expected signal associated with potential locations of sources of disturbances caused by the touch contacts, wherein the spatial domain signal encodes the physical distance traveled by the received signal due to the disturbance caused by the touch input and the expected signal encodes a variable with respect to a measure of distance; and determining the locations of the touch contacts of the touch input based at least in part on the comparison.
-
Specification