Individual channel phase delay scheme
First Claim
Patent Images
1. An electronic device, comprising:
- stimulation circuitry configured to generate a stimulation signal and to send it to one or more traversal circuits, the one or more traversal circuits configured to receive the stimulation signal and to modify it by changing at least its phase, and output the modified stimulation signal as a first signal; and
a processing module configured to receive the first signal, the processing module further comprising a demodulation circuit including a memory configured to store a processing module specific value, and configured to generate a demodulation signal associated with the first signal and having the same phase and frequency as the first signal;
wherein the demodulation circuit controls the phase of the demodulation signal by referring to the processing module specific value.
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Abstract
Embodiments of the present invention are directed to processing an incoming signal by using a demodulation signal, while controlling the phase of the demodulation signal in relation to the incoming signal. The incoming signal can be processed by being mixed with the modulation signal at a mixer. The mixing may thus cause various beneficial modifications of the incoming signal, such as noise suppression of the incoming signal, rectification of the incoming signal, demodulation of the incoming signal, etc.
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Citations
49 Claims
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1. An electronic device, comprising:
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stimulation circuitry configured to generate a stimulation signal and to send it to one or more traversal circuits, the one or more traversal circuits configured to receive the stimulation signal and to modify it by changing at least its phase, and output the modified stimulation signal as a first signal; and a processing module configured to receive the first signal, the processing module further comprising a demodulation circuit including a memory configured to store a processing module specific value, and configured to generate a demodulation signal associated with the first signal and having the same phase and frequency as the first signal; wherein the demodulation circuit controls the phase of the demodulation signal by referring to the processing module specific value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An electronic device comprising:
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a touch panel; a driver circuit for sending a stimulation signal to the touch panel; and at least one analog channel for receiving an incoming signal from the touch panel, the incoming signal being related to the stimulation signal, the incoming signal having a phase different from that of the stimulation signal, the analog channel further comprising a demodulation circuit for generating a demodulation signal and controlling the phase of the demodulation signal based on a channel specific phase delay value so that it matches the phase of the incoming signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for processing a signal comprising:
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sending a stimulation signal across one or more traversal circuits; modifying the stimulation signal by the one or more traversal circuits to form a first signal, the modification including at least a change in phase; receiving the first signal at a processing module; generating a demodulation signal by a demodulation circuit comprised by the processing module, the demodulation signal having the same phase as the first signal; and processing the first signal with reference to the demodulation signal; wherein the demodulation circuit controls the phase of the demodulation signal by referring to a processing module specific value. - View Dependent Claims (27, 28, 29, 30, 31)
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32. A method for processing information on a sensor panel, the method comprising:
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sending a stimulation signal to the panel; receiving an incoming signal at an analog channel, the incoming signal being related to the stimulation signal, but having a different phase than the stimulation signal; generating a demodulation signal at a demodulation circuit; controlling the phase of the demodulation signal based on a channel specific phase delay value to ensure it matches that of the incoming signal; and processing the incoming signal with reference to the demodulation signal. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A mobile telephone comprising:
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a touch panel; a driver circuit for sending a stimulation signal to the touch panel; at least one analog channel for receiving an incoming signal from the touch panel, the incoming signal being related to the stimulation signal, the incoming signal having a phase different from that of the stimulation signal, the analog channel further comprising a demodulation circuit for generating a demodulation signal and controlling the phase of the demodulation signal based on a channel specific phase delay value so that it matches the phase of the incoming signal.
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45. A portable music player comprising:
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a touch panel; a driver circuit for sending a stimulation signal to the touch panel; at least one analog channel for receiving an incoming signal from the touch panel, the incoming signal being related to the stimulation signal, the incoming signal having a phase different from that of the stimulation signal, the analog channel further comprising a demodulation circuit for generating a demodulation signal and controlling the phase of the demodulation signal based on a channel specific phase delay value so that it matches the phase of the incoming signal.
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46. A method for controlling the phase of a demodulation signal comprising:
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placing a digital representation of at least part of the demodulation signal in a shift register including a plurality of tap points; shifting the values within the shift register according to a phase clock, so that different values defining a digital representation of a demodulation wave appear at each tap point; selecting a tap point as a source of a demodulation wave, the selection being based on a desired phase of the demodulation signal; and changing the frequency of the clock in order to control the granularity of the digital representation of at least part of the demodulation signal as well as the size of the portion of the demodulation signal whose digital representation is placed in the shift register.
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47. A method for initializing a plurality of desired phase delay values in an electronic device featuring a touch panel comprising a plurality of rows and a plurality of channels intersecting the rows, a stimulation circuitry for sending a stimulation signal to one or more of the rows, and analog channels for detecting signals from respective channels of the touch panel, the method comprising performing the following steps for each row of the plurality of rows:
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sending a stimulation signal to the row; generating a demodulation signal by each analog channel; sweeping the phase of each demodulation signal so that demodulation signals of a plurality of different phases are generated by each analog channel; detecting at each analog channel a plurality of results, each result being based on the stimulation signal and the demodulation signal applied at a particular time; determining at each analog channel the highest result, and the phase of the demodulation signal associated with the highest result; and saving the determined phase by each analog channel as a desired phase delay value associated with the combination of the row and the respective analog channel, wherein the method results in plurality of desired phase delay values, which are usable during ordinary operation of the device to control the phase of the demodulation signal for each analog channel. - View Dependent Claims (48, 49)
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Specification