UNTETHERED STYLUS EMPOLYING MULTIPLE REFERENCE FREQUENCY COMMUNICATION
First Claim
1. An untethered stylus configured to cooperate with a location sensor, the location sensor configured to generate a drive signal, the stylus comprising:
- a housing;
transceiver circuitry disposed in the housing, the transceiver circuitry configured to receive the drive signal and transmit a stylus signal for reception by the location sensor;
energy circuitry disposed in the housing and energized by the drive signal; and
a reference frequency generator disposed in the housing and coupled to the transceiver circuitry and energy circuitry, the reference frequency generator configured to generate a plurality of reference frequencies based on a source frequency of the drive signal, the plurality of reference frequencies indicative of a plurality of stylus states and synchronized to the source frequency of the drive signal, wherein the transceiver circuitry is configured to mix the plurality of reference frequencies with the stylus signal.
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Accused Products
Abstract
An untethered stylus is configured to cooperate with a location sensing device that generates a drive signal. The stylus includes transceiver circuitry disposed in a housing, which is configured to receive the drive signal and transmit a stylus signal for reception by the location sensor. Energy circuitry is disposed in the housing and energized by the drive signal. A reference frequency generator, disposed in the housing and coupled to the transceiver circuitry and energy circuitry, is configured to generate a number of reference frequencies based on a source frequency of the drive signal, the reference frequencies indicative of a number of stylus states and synchronized to the source frequency of the drive signal. The transceiver circuitry is configured to mix the reference frequencies with the stylus signal.
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Citations
25 Claims
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1. An untethered stylus configured to cooperate with a location sensor, the location sensor configured to generate a drive signal, the stylus comprising:
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a housing; transceiver circuitry disposed in the housing, the transceiver circuitry configured to receive the drive signal and transmit a stylus signal for reception by the location sensor; energy circuitry disposed in the housing and energized by the drive signal; and a reference frequency generator disposed in the housing and coupled to the transceiver circuitry and energy circuitry, the reference frequency generator configured to generate a plurality of reference frequencies based on a source frequency of the drive signal, the plurality of reference frequencies indicative of a plurality of stylus states and synchronized to the source frequency of the drive signal, wherein the transceiver circuitry is configured to mix the plurality of reference frequencies with the stylus signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method implemented in an untethered stylus for use with a location sensor, comprising:
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receiving a drive signal by the stylus transmitted from the location sensor; energizing the stylus in response to receiving the drive signal; generating at the stylus a plurality of reference frequencies based on a source frequency of the drive signal, the plurality of reference frequencies indicative of a plurality of stylus states and synchronized to the source frequency of the drive signal; and mixing the plurality of reference frequencies with the stylus signal for reception by the location sensor. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An apparatus implemented in an untethered stylus for use with a location sensor, comprising:
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a receiver configured to receive a drive signal at the stylus transmitted from the location sensor; a power circuit provided at the stylus and energized in response to receiving the drive signal; means, coupled to the receiver and power circuit, for generating at the stylus a plurality of reference frequencies based on a source frequency of the drive signal, the plurality of reference frequencies indicative of a plurality of stylus states and synchronized to the source frequency of the drive signal; and a transmitter coupled to the generating means and configured to mix the plurality of reference frequencies with the stylus signal. - View Dependent Claims (25)
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Specification