SYSTEM AND METHOD FOR BI-PHASE MODULATION DECODING
First Claim
1. A decoder system that decodes a bi-phase modulated signal, the system comprising:
- a buffer configured to store a first plurality of digital samples associated with a first bit of the bi-phase modulated signal and a second plurality of digital samples associated with a second bit of the bi-phase modulated signal, the first bit immediately preceding the second bit;
a first summer configured to add the first plurality of digital samples to generate a first sum;
a second summer configured to add the second plurality of digital samples to generate a second sum; and
a comparator configured to compare the first sum and the second sum to determine an edge-transition between the first bit and the second bit, and to determine a logic-state of the first bit based on the edge-transition.
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Abstract
One embodiment of the present invention includes a decoder system that decodes a bi-phase modulated signal. The system includes a buffer configured to store a first plurality of digital samples associated with a first bit of the bi-phase modulated signal and a second plurality of digital samples associated with a second bit of the bi-phase modulated signal. The first bit can immediately precede the second bit. The system also includes a first summer configured to add the first plurality of digital samples to generate a first sum and a second summer configured to add the second plurality of digital samples to generate a second sum. The system further includes a comparator configured to compare the first sum and the second sum to determine an edge-transition between the first bit and the second bit, and to determine a logic-state of the first bit based on the edge-transition.
26 Citations
20 Claims
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1. A decoder system that decodes a bi-phase modulated signal, the system comprising:
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a buffer configured to store a first plurality of digital samples associated with a first bit of the bi-phase modulated signal and a second plurality of digital samples associated with a second bit of the bi-phase modulated signal, the first bit immediately preceding the second bit; a first summer configured to add the first plurality of digital samples to generate a first sum; a second summer configured to add the second plurality of digital samples to generate a second sum; and a comparator configured to compare the first sum and the second sum to determine an edge-transition between the first bit and the second bit, and to determine a logic-state of the first bit based on the edge-transition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for decoding a bi-phase modulated signal, the method comprising:
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receiving the bi-phase modulated signal via a transmission medium; converting the bi-phase modulated signal from an analog form to a digital form comprising a plurality of digital samples; storing the plurality of digital samples in a buffer; adding a first portion of the plurality of digital samples to generate a first sum associated with a first bit of the bi-phase modulated signal; adding a second portion of the plurality of digital samples to generate a second sum associated with a second bit of the bi-phase modulated signal, the second bit immediately following the first bit in the bi-phase modulated signal; comparing the first sum and the second sum to determine an edge-transition between the first bit and the second bit; and determining a logic-state of the first bit based on the edge-transition relative to an immediately preceding edge-transition between the first bit and an immediately preceding bit. - View Dependent Claims (13, 14, 15, 16)
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17. A wireless power system comprising:
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a portable electronic device comprising a transmitter configured to modulate a bi-phase communication signal onto a secondary current associated with a secondary inductor; and a wireless charger comprising a receiver configured to monitor a primary current associated with a primary inductor, the primary inductor and secondary inductor collectively forming an isolation transformer configured to transfer energy from the primary inductor to the secondary inductor to generate a voltage in the portable electronic device, the receiver comprising a decoder comprising; a buffer configured to store a first plurality of digital samples associated with a second half of a total number of samples of a first bit of the bi-phase modulated signal and a second plurality of digital samples associated with a second half of a total number of samples of a second bit of the bi-phase modulated signal, the first bit immediately preceding the second bit; a first summer configured to add the first plurality of digital samples to generate a first sum; a second summer configured to add the second plurality of digital samples to generate a second sum; and a comparator configured to compare the first sum and the second sum to determine an edge-transition between the first bit and the second bit, and to determine a logic-state of the second bit based on comparing the edge-transition with a previous edge-transition between the first bit and an immediately preceding bit. - View Dependent Claims (18, 19, 20)
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Specification