Auto-gain switching module for acoustic touch systems
First Claim
Patent Images
1. An apparatus for processing signals received from an acoustic touch surface, comprising:
- an analog input configured to receive an analog input signal having a signal level, the analog input signal comprising data indicative of a touch location on a touch surface;
a plurality of gain elements configured to receive the analog input signal and output gain-adjusted analog signals; and
a gain selection module configured to select one of the gain-adjusted analog signals based on the signal level of the analog input signal, wherein a gain-adjusted analog signal selected at a first time is output for at least a predetermined duration until a second time regardless of changes to the signal level of the analog input signal between the first time and the second time.
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Abstract
An apparatus for processing signals received from an acoustic touch surface comprises an analog input receiving an analog input signal having a signal level. The analog input signal comprises data indicative of a touch location on a touch surface. A plurality of gain elements receive the analog input signal and output gain-adjusted analog signals. A gain selection module selects one of the gain-adjusted analog signals based on the signal level of the analog input signal.
59 Citations
20 Claims
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1. An apparatus for processing signals received from an acoustic touch surface, comprising:
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an analog input configured to receive an analog input signal having a signal level, the analog input signal comprising data indicative of a touch location on a touch surface; a plurality of gain elements configured to receive the analog input signal and output gain-adjusted analog signals; and a gain selection module configured to select one of the gain-adjusted analog signals based on the signal level of the analog input signal, wherein a gain-adjusted analog signal selected at a first time is output for at least a predetermined duration until a second time regardless of changes to the signal level of the analog input signal between the first time and the second time. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A touch system, comprising:
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an acoustic touch pad; an auto-gain switching module configured to; receive first and second analog input signals from the touch pad, the first and second analog input signals having first and second signal levels and comprising relative spectral frequency content data indicative of a touch location on the touch pad; and adjust gain levels of the first and second analog input signals based on the first and second signal levels to generate first and second gain-adjusted signals, wherein the gain levels of the first and second analog inputs adjusted at a first time is held for at least a predetermined duration until a second time regardless of changes to the first and second signal levels between the first time and the second time; and output the first and second gain-adjusted signals to an analog to digital (A/D) converter. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method for processing signals from an acoustic touch pad, comprising:
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receiving an analog input signal having a signal level, the analog input signal comprising data indicative of a touch location on a touch pad; outputting a plurality of gain-adjusted analog signals by adjusting a gain of the analog input signal with a plurality of different gain responses; and selecting one of the gain-adjusted analog signals based on the signal level of the analog input signal, wherein a gain-adjusted analog signal selected at a first time is output for at least a predetermined duration until a second time regardless of changes to the signal level of the analog input signal between the first time and the second time. - View Dependent Claims (17, 18, 19, 20)
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Specification