Signal processing system, touch panel controller, touch panel system using same, and electronic device
First Claim
1. A signal processing system which performs signal processing on a plurality of time-series signals which are sampled at a discrete time and are derived from a linear element driven in parallel on a basis of a code sequence, the signal processing being performed based on an inner product operation of the time-series signals and the code sequence, to estimate a value or an input of the linear element, the signal processing system comprising:
- first and second subsystems which have different input-output transfer characteristics; and
a switching circuit which switches between the first subsystem and the second subsystem and then connects one of the first and second subsystems to the linear element, to reduce noise present in a result of estimation of the value or input of the linear element, which estimation is performed by signal processing through inner product calculation of the code sequence, on a basis of a frequency of noise mixed in each of the time-series signals, an amount of that noise, and the input-output transfer characteristics.
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Accused Products
Abstract
A signal processing system (10) includes a switching circuits (6) which switches between subsystems (5a, 5b), on a basis of a frequency of noise mixed in each of time-series signals, the amount of that noise, and input-output transfer characteristics, to reduce noise present in a result of estimation of the value of a linear element (CX), which estimation is performed by addition- and subtraction-based signal processing.
9 Citations
17 Claims
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1. A signal processing system which performs signal processing on a plurality of time-series signals which are sampled at a discrete time and are derived from a linear element driven in parallel on a basis of a code sequence, the signal processing being performed based on an inner product operation of the time-series signals and the code sequence, to estimate a value or an input of the linear element, the signal processing system comprising:
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first and second subsystems which have different input-output transfer characteristics; and a switching circuit which switches between the first subsystem and the second subsystem and then connects one of the first and second subsystems to the linear element, to reduce noise present in a result of estimation of the value or input of the linear element, which estimation is performed by signal processing through inner product calculation of the code sequence, on a basis of a frequency of noise mixed in each of the time-series signals, an amount of that noise, and the input-output transfer characteristics. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A touch panel controller which controls a touch panel including a plurality of electrostatic capacitors provided at respective intersections where a plurality of drive lines and a plurality of sense lines intersect with each other, the touch panel controller comprising:
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a driving circuit which drives the electrostatic capacitors in parallel along the drive lines on a basis of a code sequence; an amplifier circuit which (i) reads, along the sense lines, a plurality of linear sum signals based on respective ones of the electrostatic capacitors which are driven in parallel by the driving circuit and (ii) then amplifies the linear sum signals thus read; an analog-to-digital conversion circuit which performs analog-to-digital conversion on outputs of the amplifier circuit; a decoding operation circuit which estimates respective capacitance values of the electrostatic capacitors on a basis of an inner product operation of (i) the code sequence and (ii) respective ones of the outputs having been fed from the amplifier circuit and then subjected to the analog-to-digital conversion; first and second subsystems which have different input-output transfer characteristics; and a switching circuit which switches between the first subsystem and the second subsystem and then connects one of the first and second subsystems to the driving circuit, to reduce noise present in a result of estimation of respective values of the electrostatic capacitors, which estimation is performed by the addition- and subtraction-based signal processing performed by the decoding operation circuit, on a basis of a frequency of noise mixed in each of the linear sum signals, an amount of that noise, and the input-output transfer characteristics. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A touch panel system, comprising:
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a touch panel which includes a plurality of electrostatic capacitors provided at respective intersections where a plurality of drive lines and a plurality of sense lines intersect with each other; and a touch panel controller which controls the touch panel, the touch panel controller including; a driving circuit which drives the electrostatic capacitors in parallel along the drive lines on a basis of a code sequence; an amplifier circuit which (i) reads, along the sense lines, a plurality of linear sum signals based on respective ones of the electrostatic capacitors which are driven in parallel by the driving circuit and (ii) then amplifies the linear sum signals thus read; an analog-to-digital conversion circuit which performs analog-to-digital conversion on outputs of the amplifier circuit; a decoding operation circuit which estimates respective capacitance values of the electrostatic capacitors on a basis of an inner product operation of (i) the code sequence and (ii) respective ones of the outputs having been fed from the amplifier circuit and then subjected to the analog-to-digital conversion; first and second subsystems which have different input-output transfer characteristics; and a switching circuit which switches between the first subsystem and the second subsystem and then connects one of the first and second subsystems to the driving circuit, to reduce noise present in a result of estimation of respective values of the electrostatic capacitors, which estimation is performed by the addition- and subtraction-based signal processing performed by the decoding operation circuit, on a basis of a frequency of noise mixed in each of the linear sum signals, an amount of that noise, and the input-output transfer characteristics. - View Dependent Claims (17)
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Specification