Communication system and receiver used in communication system
View Patent ↗A communication system is provided comprising an environment-side electrode and a living body-side electrode sandwiching an insulating layer and electrically insulated from each other, a grounding electrode which is electrically connected to the environment-side electrode, and a reception amplifier which amplifies a potential difference between the environment-side electrode and the living body-side electrode, wherein the grounding electrode has a side surface section which extends along a vertical direction.
1. A communication system for enabling communication between a transmitter which is portable and a receiver which is fixed, using a capacitive coupling through a living body, wherein
the receiver comprises:
an environment-side electrode and a living body-side electrode sandwiching an insulating layer and electrically insulated from each other;
a grounding electrode electrically connected to the environment-side electrode;
a reception amplifier which amplifies at least a voltage of the living body-side electrode;
a transmission environment-side electrode and a transmission living body-side electrode sandwiching an insulating layer and electrically insulated from each other; and
a transmission amplifier which amplifies a signal and outputs at least to the transmission living body-side electrode;
the transmitter comprises:
a transmission environment-side electrode and a transmission living body-side electrode sandwiching an insulating layer and electrically insulated from each other;
a transmission amplifier which amplifies a signal and outputs to at least the transmission living body-side electrode;
a reception environment-side electrode and a reception living body-side electrode sandwiching an insulating layer and electrically insulated from each other; and
a reception amplifier which amplifies at least a voltage of the living body-side electrode; and
the grounding electrode has a side surface section which extends along a vertical direction; and
polling is executed for the receiver by transmitting a calling signal from the transmitter.
2. The communication system according to claim 1 , wherein
the grounding electrode continuously extends from a floor surface along the vertical direction at a location where the receiver is placed.
3. The communication system according to claim 1 , wherein
the grounding electrode comprises a bottom surface section which is electrically connected to the side surface section and which is placed on a floor surface at a location where the receiver is placed.
4. The communication system according to claim 1 , wherein
at least a part of the grounding electrode has a mesh shape.
5. The communication system according to claim 1 , wherein
the grounding electrode extends to a height of 100 cm or higher from a floor surface at a location where the receiver is placed.
6. The communication system according to claim 1 , wherein
the reception amplifier comprises a differential amplifier circuit which amplifies and outputs a potential difference between the living body-side electrode and the environment-side electrode.
7. The communication system according to claim 1 , wherein
the reception amplifier comprises a single amplifier circuit which amplifies and outputs a voltage of the living body-side electrode with a reference at a potential of the environment-side electrode.
8. The communication system according to claim 1 , wherein
the environment-side electrode and the living body-side electrode of the receiver are electromagnetically shielded by the grounding electrode.
9. A receiver for enabling communication with a transmitter which is portable using a capacitive coupling through a living body,
the receiver comprising:
an environment-side electrode and a living body-side electrode sandwiching an insulating layer and electrically insulated from each other;
a grounding electrode which is electrically connected to the environment-side electrode; and
a reception amplifier which amplifies at least a voltage of the living body-side electrode;
a transmission environment-side electrode and a transmission living body-side electrode sandwiching an insulating layer and electrically insulated from each other; and
a transmission amplifier which amplifies a signal and outputs at least to the transmission living body-side electrode;
the transmitter comprising:
a transmission environment-side electrode and a transmission living body-side electrode sandwiching an insulating layer and electrically insulated from each other;
a transmission amplifier which amplifies a signal and outputs to at least the transmission living body-side electrode;
a reception environment-side electrode and a reception living body-side electrode sandwiching an insulating layer and electrically insulated from each other; and
a reception amplifier which amplifies at least a voltage of the living body-side electrode;
wherein the grounding electrode has a side surface section which extends along a vertical direction; and
polling is executed for the receiver by transmitting a calling signal from the transmitter.