Communication system and receiver used in communication system

Abstract

The invention provides a communication system and a receiver used in communication system. The communication system comprises a living body-side electrode which primarily capacitively couples with a living body, an environment-side electrode which primarily capacitively couples with an external environment, and a circuit board on which a circuit which processes a signal which is output from at least one of the living body-side electrode and the environment-side electrode is mounted, wherein the circuit board is not placed between the living body-side electrode and the environment-side electrode. Therefore, communication performance of communication system with the help of human body is improved.

Description

technical field [0001] The present invention relates to a communication system for communication via a human body and the like and a receiving device used in the communication system. Background technique [0002] There are known communication devices that communicate via biological tissues such as the human body. For example, it is known that a portable electric device such as a mobile phone equipped with a transmitting device is placed in the pocket of the user's clothes and in a hands-free state, which can exchange data only by placing the hand on the receiving device (not Patent Documents 1, 2, etc.). [0003] For example, if Figure 10 As shown, the transmitting device 100 includes an encoding unit 10 , a transmitting amplifier 12 , an environment-side electrode 14 and a body-side electrode 16 , and the receiving device 102 includes a decoding unit 18 , a receiving amplifier 20 , an environment-side electrode 22 and a body-side electrode 24 . The transmitting device 1...

AI Technical Summary

Problems solved by technology

[0015] That is, without the sealing box 28, the parasitic capacitance between the environment-side electrode 14 and the living body-side electrode 16 and the circuit substrate 26 is reduced compared to the case where the sealing box 28 is provided, so that the absolute strength of the received signal can be strengthened, However, the electromagnetic waves emitted from the circuit board 26 are superimposed as noise on the signals received by the environment-side electrode 14 and the living body-side electrode 16 to degrade the S / N ratio.

[0016] In particular, as the size of the portable terminal becomes smaller, if the distance between the environment-side electrode 14 or the living body-side electrode 16 and the circuit board 26 is close, the influence of electromagnetic wave noise emitted from the circuit board 26 will increase, and the S / N of the received signal will decrease. the problem becomes apparent

Images