Method and apparatus for transfering information from a transponder
First Claim
1. A method of transferring information from a transponder, comprising the steps of;
- selecting a first frequency representing data bits of information having a binary zero value;
selecting a second frequency representing data bits of information having a binary one value;
generating a transponder resonant frequency signal having one of the first and second frequencies;
changing a frequency of the transponder resonant frequency signal between the first and second frequencies in response to the data bits of the information in order to transmit the information, the data bits of information having a binary zero value being of a same bit length as the data bits of information having a binary one value;
counting a first number of cycles of the first frequency; and
counting a second number of cycles of the second frequency, the first number of cycles being different than the second number of cycles to achieve the same bit length, each counting step controlling the changing of the transponder resonant frequency signal according to each data bit of information to be transmitted.
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Accused Products
Abstract
A transponder unit (10) includes an N cycle counter (30) and an M cycle counter (28). The N cycle counter (30) has a different cycle value than the M cycle counter (28). During the transmission of information from the transponder unit (10), the duration for data bits having a binary zero value is controlled by the N cycle counter (30). The duration of data bits having a binary one value is controlled by the M cycle counter (28). The use of different cycle values within the N cycle counter (30) and the M cycle counter (28) allows for the transmission of binary one and binary zero data bits having the same bit length despite different frequencies representing the binary one and binary zero bits respectively.
105 Citations
15 Claims
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1. A method of transferring information from a transponder, comprising the steps of;
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selecting a first frequency representing data bits of information having a binary zero value; selecting a second frequency representing data bits of information having a binary one value; generating a transponder resonant frequency signal having one of the first and second frequencies; changing a frequency of the transponder resonant frequency signal between the first and second frequencies in response to the data bits of the information in order to transmit the information, the data bits of information having a binary zero value being of a same bit length as the data bits of information having a binary one value; counting a first number of cycles of the first frequency; and counting a second number of cycles of the second frequency, the first number of cycles being different than the second number of cycles to achieve the same bit length, each counting step controlling the changing of the transponder resonant frequency signal according to each data bit of information to be transmitted. - View Dependent Claims (2, 3, 4, 5)
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6. A transponder for transferring information, comprising:
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a resonant circuit operable to generate a transponder resonant frequency signal, said transmit frequency signal having one of a first frequency and a second frequency, said first frequency representing data bits of information having a binary zero value, said second frequency representing data bits of information having a binary one value; a control circuit operable to select one of said first and second frequencies for said transponder resonant frequency signal associated with each data bit of information, said control circuit transmitting each data bit of information with a same bit length regardless of which of said first and second frequencies is selected for said transponder resonant frequency signal; wherein said control circuit includes a first counter circuit associated with said first frequency and a second counter circuit associated with said second frequency, said first counter circuit operable to count down from a first value, said second counter circuit operable to count down from a second value, said first value being different than said second value to achieve said same bit length. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A transponder for transmitting information comprising:
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a resonant circuit operable to generate a transponder resonant frequency signal said transponder resonant frequency signal having one of a first frequency and a second frequency, said first frequency representing data bits of information having a binary zero value, said second frequency representing data bits of information having a binary one value; a switch circuit operable to change said transmit frequency of said resonant circuit between said first and second frequencies; a first counter circuit operable to count a first number of cycles of said transponder resonant frequency signal, said first counter circuit associated with said first frequency; a second counter circuit operable to count a second number of cycles of said transponder resonant frequency signal, said second counter circuit associated with said second frequency; a memory circuit operable to store said data bits of information, said memory circuit operable to sequentially transfer each data bit of information in response to one of said first and second counter circuits in order to control said switch circuit, said first and second counter circuits ensuring that each data bit of information is transmitted by said resonant circuit with a same bit length regardless of which of said first and second frequencies is selected for said transponder resonant frequency signal. - View Dependent Claims (13, 14, 15)
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Specification