Communication apparatus
First Claim
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1. A human body communication apparatus comprising:
- an electrode unit, in direct contact with a human body, configured to transmit a base-band signal in the form of a current through the human body and receive a signal from the human body, wherein the base-band signal is a non-frequency-modulated signal;
a high pass filter configured to eliminate noise included in the base-band signal received through the electrode unit;
a comparator configured to compare the base-band signal transmitted through the high pass filter with a reference voltage;
a controller configured to recover the base-band signal transmitted through the comparator, transmit the recovered signal to an external host located in a vicinity of the human body, and further configured to receive a data signal in the form of a current from the external host, generate a second base-band signal, and transmit the second base-band signal to the human body through the electrode unit; and
an amplifier configured to amplify the signal transmitted from the high pass filter and transmit the amplified signal to the comparator.
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Abstract
The present invention provides a communication apparatus being in directly contact with a human body and using the human body as a transmission channel for data communication. The communication apparatus attached to the human body transmits a signal in the form of a current, receives a signal transmitted from another communication apparatus attached to the human body therethrough, and eliminates noise included in the received signal. In addition, the communication apparatus compares the noise-eliminated signal and a reference signal and recovers an original signal. Further, the communication apparatus generates a base-band signal and transmits the same through the human body.
142 Citations
9 Claims
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1. A human body communication apparatus comprising:
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an electrode unit, in direct contact with a human body, configured to transmit a base-band signal in the form of a current through the human body and receive a signal from the human body, wherein the base-band signal is a non-frequency-modulated signal; a high pass filter configured to eliminate noise included in the base-band signal received through the electrode unit; a comparator configured to compare the base-band signal transmitted through the high pass filter with a reference voltage; a controller configured to recover the base-band signal transmitted through the comparator, transmit the recovered signal to an external host located in a vicinity of the human body, and further configured to receive a data signal in the form of a current from the external host, generate a second base-band signal, and transmit the second base-band signal to the human body through the electrode unit; and an amplifier configured to amplify the signal transmitted from the high pass filter and transmit the amplified signal to the comparator.
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2. A human body communication apparatus for intermediating between a host, and transmitting and receiving data through the human body, the human body communication apparatus comprising:
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an electrode unit, in direct contact with the human body, configured to transmit a signal in the form of a current through the human body and receive a signal from the human body; a high pass filter configured to eliminate noise included in the signal received from the electrode unit; a comparator configured to compare the signal transmitted through the high pass filter with a reference voltage; a controller configured to recover the signal transmitted through the comparator, transmit the recovered signal to the host, generate a base-band signal, and transmit the base-band signal to the human body through the electrode unit; an amplifier configured to amplify the signal transmitted from the high pass filter and transmit the amplified signal to the comparator; and a clock and data recovery (CDR) unit configured to analyze the signal transmitted from the comparator and perceiving perceive start and end times of recovering of the received signal. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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Specification