Cordless digitizer stylus status encoding and transmission scheme
First Claim
1. In a cordless digitizing system wherein a cordless stylus transmits positional pulses to a tablet at a carrier frequency, a method for transmitting status information about the stylus to the tablet comprising the steps of:
- a) assigning a first unique and recognizable sequence of carrier frequency cycles to be a first binary state wherein said first sequence comprises a number of cycles of carrier signal, a contiguous portion of a predetermined length of said first sequence being suppressed;
b) assigning a second unique and recognizable sequence of second binary state wherein said second sequence comprises said number of cycles of carrier signal, said second sequence being generally unsuppressed; and
,c) transmitting the status information in binary form employing said first unique and recognizable sequence of carrier frequency cycles as said first binary state and said second unique and recognizable sequence of carrier frequency cycles as said second binary state, and wherein said first and second sequences are transmitted in continuous succession whereby successive sequences of said second binary state comprise contiguous unsuppressed cycles of carrier signal.
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Accused Products
Abstract
In a cordless digitizing system wherein a cordless stylus having a manually operable button thereon transmits positional pulses to a tablet at a carrier frequency this invention is apparatus for transmitting status information about the button to the tablet. There is first status logic associated with the stylus for sensing the present status of the button and for encoding and transmitting the present status of the button as a binary 1 or 0 employing a first unique and recognizable sequence of carrier frequency cycles as a binary "1" and a second unique and recognizable sequence of carrier frequency cycles as a binary "0". Then, there is second status logic included in association with the tablet for recognizing the first unique and recognizable sequence of carrier frequency cycles to be a binary "1", for recognizing the second unique and recognizable sequence of carrier frequency cycles to be a binary "0", and for determining the present status of the button therefrom. The status of multiple buttons on the stylus is transmitted in the same manner by assigning the buttons positions in a binary data stream.
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Citations
16 Claims
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1. In a cordless digitizing system wherein a cordless stylus transmits positional pulses to a tablet at a carrier frequency, a method for transmitting status information about the stylus to the tablet comprising the steps of:
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a) assigning a first unique and recognizable sequence of carrier frequency cycles to be a first binary state wherein said first sequence comprises a number of cycles of carrier signal, a contiguous portion of a predetermined length of said first sequence being suppressed; b) assigning a second unique and recognizable sequence of second binary state wherein said second sequence comprises said number of cycles of carrier signal, said second sequence being generally unsuppressed; and
,c) transmitting the status information in binary form employing said first unique and recognizable sequence of carrier frequency cycles as said first binary state and said second unique and recognizable sequence of carrier frequency cycles as said second binary state, and wherein said first and second sequences are transmitted in continuous succession whereby successive sequences of said second binary state comprise contiguous unsuppressed cycles of carrier signal. - View Dependent Claims (2, 3, 4, 13, 14)
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5. In a cordless digitizing system wherein a cordless stylus having a manually operable button thereon transmits positional pulses to a tablet at a carrier frequency, a method for transmitting status information about the button to the tablet comprising the steps of:
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a) assigning a first unique and recognizable sequence of carrier frequency cycles to be a first binary state wherein said first sequence comprises a number of cycles of carrier signal, a contiguous portion of a predetermined length of said first sequence being suppressed; b) assigning a second unique and recognizable sequence of carrier frequency cycles to be a second binary state wherein said second sequence comprises said number of cycles of carrier signal, said second sequence being generally unsuppressed; and
,c) transmitting the status information about the button in binary form employing said first unique and recognizable sequence of carrier frequency cycles as said first binary state and said second unique and recognizable sequence of carrier frequency cycles as said second binary state, and wherein said first and second sequences are transmitted in continuous succession whereby successive sequences of said second binary state comprise contiguous unsuppressed cycles of carrier signal. - View Dependent Claims (6, 7, 15, 16)
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8. In a cordless digitizing system wherein a cordless stylus having a manually operable button thereon transmits positional pulses to a tablet at a carrier frequency, apparatus for transmitting status information about the button to the tablet comprising:
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a) a first status logic associated with the stylus for sensing the present status of the button and for encoding and transmitting said present status of the button as one of (i) a first binary state and (ii) a second binary state employing a first unique and recognizable sequence of carrier frequency cycles to be the first binary state wherein said first sequence comprises a number of cycles of carrier signal, a contiguous portion of a predetermined length of said first sequence being suppressed, and a second unique and recognizable sequence of carrier frequency cycles as the second binary state wherein said second sequence comprises said number of cycles of carrier signal, said second sequence being generally unsuppressed, and wherein said first and second sequences are transmitted in continuous succession whereby successive sequences of said second binary state comprise continuous unsuppressed cycles of carrier signal; and
,c) second status logic included in association with the tablet for recognizing said first unique and recognizable sequence of carrier frequency cycles to be the first binary state, for recognizing said second unique and recognizable sequence of carrier frequency cycles to be the second binary state, and for determining said present status of the button therefrom. - View Dependent Claims (9, 10)
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11. In a cordless digitizing system wherein a cordless stylus having a plurality of manually operable buttons thereon transmits positional pulses to a tablet at a carrier frequency, apparatus for transmitting status information about the buttons to the tablet comprising:
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a) first status logic associated with the stylus having respective ones of the plurality of buttons assigned to a position in a binary data stream for sensing the present status of each of the plurality of buttons and for encoding and transmitting said present status of each of the plurality of buttons as a binary 1 or 0 at its said position in said binary data stream employing a first unique and recognizable sequence of carrier frequency cycles as a binary "1" and a second unique and recognizable sequence of carrier frequency cycles as a binary "0"; and
,b) second status logic included in association with the tablet for recognizing said first unique and recognizable sequence of carrier frequency cycles to be a binary "1", for recognizing said second unique and recognizable sequence of carrier frequency cycles to be a binary "0", and for determining said present status of each of the plurality of buttons from a binary 1 or 0 in its said position in said binary stream. - View Dependent Claims (12)
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Specification