Capacitive touch sensor having correlation with a receiver
First Claim
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1. A method performed by a data processing apparatus associated with a sensor having a front end interface, at least one trace line, at least one transmitter coupled with both the front end interface and a first location on at least one of the trace lines, and a receiver coupled with a second location on at least the one trace line, the method comprising:
- accessing a signal at the front end interface of the sensor, wherein the sensor comprises trace lines in a matrix;
transmitting the accessed signal from the transmitter to the first location on at least one of the trace lines of the sensor to promote transmission of the accessed signal along the trace line corresponding to the first location to which the accessed signal is transmitted, wherein the transmitting further comprises driving the sensor with the transmitted signal at two edges of the matrix to reduce a resistance-capacitance time constant by two when compared to a time constant derived from driving the sensor with the transmitted signal at one edge;
receiving, at the receiver of the sensor and from the trace line through the receiver coupled with the second location of the trace line of the sensor, the accessed and transmitted signal;
accessing a distance between the first location of transmitter and the second location of receiver along the trace line used to transmit the accessed signal;
determining, based on the accessed distance, a transformation that the transmitted signal is expected to experience based on the transmission as a function of the distance between the first and second locations;
generating an expected correlation signal based on the determined transformation;
receiving the expected correlation signal at the receiver of the sensor;
based on the expected correlation signal received, identifying information that can be used to at least partially compensate for the transformation that the transmitted signal is expected to experience based on the transmission; and
compensating, by applying the expected correlation signal received, for at least part of the transformation that the transmitted signal is expected to experience based on the transmission.
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Abstract
Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for digital signal processing (DSP) techniques for generally improving a signal-to-noise ratio (SNR) of capacitive touch sensors.
43 Citations
43 Claims
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1. A method performed by a data processing apparatus associated with a sensor having a front end interface, at least one trace line, at least one transmitter coupled with both the front end interface and a first location on at least one of the trace lines, and a receiver coupled with a second location on at least the one trace line, the method comprising:
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accessing a signal at the front end interface of the sensor, wherein the sensor comprises trace lines in a matrix; transmitting the accessed signal from the transmitter to the first location on at least one of the trace lines of the sensor to promote transmission of the accessed signal along the trace line corresponding to the first location to which the accessed signal is transmitted, wherein the transmitting further comprises driving the sensor with the transmitted signal at two edges of the matrix to reduce a resistance-capacitance time constant by two when compared to a time constant derived from driving the sensor with the transmitted signal at one edge; receiving, at the receiver of the sensor and from the trace line through the receiver coupled with the second location of the trace line of the sensor, the accessed and transmitted signal; accessing a distance between the first location of transmitter and the second location of receiver along the trace line used to transmit the accessed signal; determining, based on the accessed distance, a transformation that the transmitted signal is expected to experience based on the transmission as a function of the distance between the first and second locations; generating an expected correlation signal based on the determined transformation; receiving the expected correlation signal at the receiver of the sensor; based on the expected correlation signal received, identifying information that can be used to at least partially compensate for the transformation that the transmitted signal is expected to experience based on the transmission; and compensating, by applying the expected correlation signal received, for at least part of the transformation that the transmitted signal is expected to experience based on the transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A system comprising:
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a sensor comprising; a front end interface; trace lines in a matrix configuration; at least one trace line having a first location and a second location on the trace line; at least one transmitter coupled with both the front end interface and the first location on at least one of the trace lines; and a receiver coupled with the second location on at least the one trace line; wherein the system is configured to; access a signal at the front end interface of the sensor; transmit the accessed signal from the transmitter to the first location on at least one of the trace lines of the sensor to promote transmission of the accessed signal along the trace line corresponding to the first location to which the accessed signal is transmitted, wherein the transmitting further comprises driving the sensor with the transmitted signal at two edges of the matrix to reduce a resistance-capacitance time constant by two when compared to a time constant derived from driving the sensor with the transmitted signal at one edge; receive, at the receiver of the sensor and from the trace line through the receiver coupled with the second location of the trace line of the sensor, the accessed and transmitted signal; access a distance between the first location of transmitter and the second location of receiver along the trace line used to transmit the accessed signal; determine, based on the accessed distance, a transformation that the transmitted signal is expected to experience based on the transmission as a function of the distance between the first and second locations; generate an expected correlation signal based on the determined transformation; receive the expected correlation signal at the receiver of the sensor; based on the expected correlation signal received, identify information that can be used to at least partially compensate for the transformation that the transmitted signal is expected to experience based on the transmission; and compensate, by applying the expected correlation signal received, for least part of the transformation that the transmitted signal is expected to experience based on the transmission. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A system comprising:
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a sensor comprising; a front end interface; trace lines in a matrix configuration; at least one trace line having a first location and a second location on the trace line; at least one transmitter coupled with both the front end interface and the first location on at least one of the trace lines; and a receiver coupled with the second location on at least the one trace line; means for accessing a signal at the front end interface of the sensor; means for transmitting the accessed signal from the transmitter to the first location on at least one of the trace lines of the sensor to promote transmission of the accessed signal along the trace line corresponding to the first location to which the accessed signal is transmitted, wherein the transmitting further comprises driving the sensor with the transmitted signal at two edges of the matrix to reduce a resistance-capacitance time constant by two when compared to a time constant derived from driving the sensor with the transmitted signal at one edge; means for receiving, at the receiver of the sensor and from the trace line through the receiver coupled with the second location of the trace line of the sensor, the accessed and transmitted signal; means for accessing a distance between the first location of transmitter and the second location of receiver along the trace line used to transmit the accessed signal; means for determining, based on the accessed distance, a transformation that the transmitted signal is expected to experience based on the transmission as a function of the distance between the first and second locations; means for generating an expected correlation signal based on the determined transformation; means for receiving the expected correlation signal at the receiver of the sensor; based on the expected correlation signal received, means for identifying information that can be used to at least partially compensate for the transformation that the transmitted signal is expected to experience based on the transmission; and means for compensating, by applying the expected correlation signal received, for least part of the transformation that the transmitted signal is expected to experience based on the transmission.
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Specification