Active signal processing personal health signal receivers
First Claim
Patent Images
1. A signal receiver comprising:
- an automatic gain controller configured to receive an encoded signal from an in vivo transmitter in a low signal to noise ratio (SNR) environment and to actively adjust the signal receiver to variations in frequency and power of the received encoded signal, and wherein the automatic gain controller is configured to determine a first frequency having a highest amplitude in a power spectrum of the received encoded signal;
a demodulator coupled to the automatic gain controller and configured to receive an output signal from the automatic gain controller, wherein the output signal comprises information regarding the first frequency, and reconstruct the encoded signal locked in frequency and phase to the received encoded signal and configured to approximate an original un-encoded signal, wherein the demodulator is tuned to the first frequency such that the demodulator is configured to adapt to changes in frequency of the received encoded signal;
a symbol recovery component configured to receive the reconstructed encoded signal and determine a signal clock of the reconstructed encoded signal and identify a start sequence in the reconstructed encoded signal, and wherein the symbol recovery component is configured to determine a phase of the reconstructed encoded signal, and produce a decoded signal with substantially no error.
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Abstract
The invention provides a receiver associated with a body, e.g., located inside or within close proximity to a body, configured to receive and decode a signal from an in vivo transmitter which located inside the body. Signal receivers of the invention provide for accurate signal decoding of a low-level signal, even in the presence of significant noise, using a small-scale chip, e.g., where the chip consumes very low power. Also provided are systems that include the receivers, as well as methods of using the same.
924 Citations
37 Claims
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1. A signal receiver comprising:
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an automatic gain controller configured to receive an encoded signal from an in vivo transmitter in a low signal to noise ratio (SNR) environment and to actively adjust the signal receiver to variations in frequency and power of the received encoded signal, and wherein the automatic gain controller is configured to determine a first frequency having a highest amplitude in a power spectrum of the received encoded signal; a demodulator coupled to the automatic gain controller and configured to receive an output signal from the automatic gain controller, wherein the output signal comprises information regarding the first frequency, and reconstruct the encoded signal locked in frequency and phase to the received encoded signal and configured to approximate an original un-encoded signal, wherein the demodulator is tuned to the first frequency such that the demodulator is configured to adapt to changes in frequency of the received encoded signal; a symbol recovery component configured to receive the reconstructed encoded signal and determine a signal clock of the reconstructed encoded signal and identify a start sequence in the reconstructed encoded signal, and wherein the symbol recovery component is configured to determine a phase of the reconstructed encoded signal, and produce a decoded signal with substantially no error. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 30)
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26. A method of transmitting data from an in vivo transmitter to a body associated receiver sized to be stably associated with a living subject in a manner that does not substantially impact movement of the living subject, the method comprising:
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transmitting a modulated encoded data signal from the in vivo transmitter to the body associated receiver; and receiving the modulated encoded data signal at the body associated receiver in accordance with the following method; receiving the modulated encoded data signal in a low signal to noise ratio (SNR) environment and to actively adjust to variations in the frequency and power of the received modulated encoded data signal; determining a first frequency having a highest amplitude in a power spectrum of the received modulated encoded data signal; demodulating the received modulated encoded data signal and reconstructing the modulated encoded data signal locked in frequency and phase to the received modulated encoded data signal, wherein demodulating the received modulated encoded data signal and reconstructing the modulated encoded data signal comprises; approximating, by a demodulator, an original un-encoded data signal, wherein the demodulator is tuned to the first frequency such that the demodulator is configured to adapt to changes in frequency of the received encoded signal; and receiving the reconstructed modulated encoded data signal; and determining a signal clock of the reconstructed modulated encoded data signal; and identifying a start sequence in the reconstructed modulated encoded data signal; and determining a phase of the reconstructed modulated encoded data signal; and producing a decoded signal with substantially no error. - View Dependent Claims (27, 28, 29)
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31. A signal receiver comprising:
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an automatic gain controller configured to; receive an encoded signal from an in vivo transmitter and to actively adjust the signal receiver to variations in frequency and power of the received encoded signal; and determine a first frequency having a highest amplitude in a power spectrum of the received encoded signal; a demodulator coupled to the automatic gain controller, the demodulator configured to; receive an output signal from the automatic gain controller, wherein the output signal comprises information regarding the first frequency; reconstruct the encoded signal locked in frequency and phase to the received encoded signal; approximate an original un-encoded signal, wherein the demodulator is tuned to the first frequency to adapt to variations in frequency of the received encoded signal; and a symbol recovery component configured to; receive the reconstructed encoded signal; determine a signal clock of the reconstructed encoded signal to identify a start sequence in the reconstructed encoded signal; determine a phase of the reconstructed encoded signal; and produce a decoded signal. - View Dependent Claims (32, 33, 34, 35, 36, 37)
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Specification