KR20230140268A - Human body communication transmitter and human body communication receiver - Google Patents

Abstract

The human body communication transmission device according to an embodiment of the present disclosure includes a data generation circuit for generating wakeup data, header data, and user data, and a modulator, and the modulator modulates the wakeup data or header data to generate a first modulation signal. A header data modulator that generates a header data modulator, a user data modulator that modulates user data to generate a second modulation signal, a low-frequency generator that outputs a low-frequency signal based on the first modulation signal or the second modulation signal, and a first modulation signal or It includes a high frequency generator that outputs a high frequency signal based on the second modulation signal.

Description

Human body communication transmitting device and human body communication receiving device {HUMAN BODY COMMUNICATION TRANSMITTER AND HUMAN BODY COMMUNICATION RECEIVER}

The present disclosure relates to a device for transmitting and receiving information using a living body as a medium, and more specifically, to a human body communication transmitting device and a human body communication receiving device.

Human communication devices and systems that transmit signals or information from a transmitting device to a receiving device using living organisms such as humans or animals are emerging. Human body communication transmitting devices and human body communication receiving devices can be applied in various fields such as medical care, security, retail, and smart management. For example, human body communication transmitting devices and human body communication receiving devices include portable devices such as PDAs (Personal Digital Assistants), laptops, digital cameras, MP3 players, and mobile phones, and fixed devices such as credit card payment devices, TVs, and access systems. , and can be used for communication with medical devices such as capsule endoscopes. The human body communication method does not require a separate wired signal transmission medium, and since the living body is used as a medium, binding force on the signal can be secured.

The human body has low conductivity and high dielectric constant, so it acts like an antenna in a wide frequency range. Due to the characteristics of the human body, unwanted noise signals may be generated from signals from other nearby users or external electronic devices, and communication with the human body may become unstable depending on the distance or location between surrounding objects or devices. Therefore, encoding and decoding technologies for stable communication without being affected by such interference are required. Additionally, depending on the characteristics of human communication devices, low-power operation of the transmitting device and receiving device is required.

The purpose of the present disclosure is to improve the performance of human body communication and to provide a human body communication transmitting device and a human body communication receiving device that operate at low power.

The human body communication transmission device according to an embodiment of the present disclosure includes a data generation circuit for generating wakeup data, header data, and user data, and a modulator, and the modulator modulates the wakeup data or header data to generate a first modulation signal. A header data modulator that generates a header data modulator, a user data modulator that modulates user data to generate a second modulation signal, a low-frequency generator that outputs a low-frequency signal based on the first modulation signal or the second modulation signal, and a first modulation signal or It includes a high frequency generator that outputs a high frequency signal based on the second modulation signal.

In one embodiment, the modulator further includes an electrode that outputs a low-frequency signal or a high-frequency signal to a human body communication channel.

In one embodiment, a multiplexer that multiplexes wake-up data and header data and outputs them to a header data modulator, a first switch that transmits a first modulation signal or a second modulation signal to a low-frequency generator or a high-frequency generator, and a high-frequency signal or low-frequency It further includes a second switch that transmits a signal to the electrode.

In one embodiment, the modulator further includes a controller configured to repeatedly output a low-frequency signal including wake-up data through the electrode.

In one embodiment, the electrode outputs a low-frequency signal including wake-up data to a human body communication channel, and then outputs a low-frequency signal including user data or a high-frequency signal including user data to the human body communication channel.

In one embodiment, wakeup data includes master wakeup information, device wakeup information, and device identifier information.

In one embodiment, in order to transmit a signal to a plurality of external human body communication receiving devices, the data generation circuit sets master wake-up information to a first value.

In one embodiment, in order to transmit a signal to an external specific human body communication receiving device, the data generation circuit sets the master wake-up information to a second value, the device wake-up information to a first value, and the device identifier information Set it to point to a specific external human body communication receiving device.

A human body communication receiving device according to an embodiment of the present disclosure includes an electrode that receives a received signal through a human body communication channel, a low-frequency filter that filters a low-frequency signal from the received signal and outputs the filtered low-frequency signal, and a low-frequency filter that filters the high-frequency signal from the received signal. A high-frequency filter that outputs a filtered high-frequency signal, a header/wakeup data demodulator that outputs first demodulated data by demodulating the filtered low-frequency signal, and a demodulator that demodulates the filtered low-frequency signal or the filtered high-frequency signal to output second demodulated data. A user data demodulator that decodes the first demodulated data and outputs first decoded data, a header/wakeup data decoder that decodes the second demodulated data and outputs second decoded data, a user data decoder that decodes the first demodulated data and outputs the first decoded data. A memory for storing data or second decoded data, and operations of the electrode, low-frequency filter, high-frequency filter, header/wakeup data demodulator, user data demodulator, header/wakeup data decoder, user data decoder, and memory. Includes a controller that controls.

In one embodiment, the electrode receives a low-frequency signal containing wake-up data, and then receives a low-frequency signal containing user data or a high-frequency signal containing user data.

In one embodiment, when the first decoded data is wakeup data and the wakeup condition is met, power is provided to the power off domain and the sleep mode is switched to the normal mode.

In one embodiment, the power off domain includes a high-frequency filter, a user data demodulator, a user data decoder, and a memory.

In one embodiment, the wakeup condition includes a case where master wakeup information of wakeup data is a first value.

In one embodiment, the wakeup condition includes a case where the device wakeup information of the wakeup data is a first value and the device identifier information of the wakeup data is the same as the stored device identifier.

In one embodiment, after switching from the power saving mode to the normal mode, if user data is stored in memory, power is not provided to the power off domain, and the normal mode is switched back to the power saving mode.

In one embodiment, the power saving mode refers to a state in which only low-frequency signals can be processed, and the normal mode refers to a state in which low-frequency signals or high-frequency signals can be processed.

In one embodiment, when receiving a first low-frequency signal including first wake-up data and a second low-frequency signal including the first wake-up data, the controller determines whether the wake-up condition is met based on the first low-frequency signal. In this case, the second low-frequency signal is not processed.

According to an embodiment of the present disclosure, signals can be efficiently transmitted using the radiation characteristics of human body communication. Accordingly, a low-power human body communication transmitting device and a human body communication receiving device that prevents interference with other human body communication devices are provided.

1 is a diagram illustrating a human body communication system according to an embodiment of the present disclosure.
Figure 2 is a graph for explaining the radiation characteristics of human body communication signals.
FIG. 3 is a block diagram showing an example of the human body communication system of FIG. 1.
Figure 4 is a block diagram showing the modulator of Figure 3 in more detail.
Figure 5 is a block diagram showing the demodulator of Figure 3 in more detail.
Figure 6 is a diagram showing an example of wake-up data.
FIGS. 7 and 8 are diagrams showing examples of the operation of the transmitting device of FIG. 3.
FIG. 9 is a flowchart showing an example of the operation of the receiving device of FIG. 3.
FIG. 10 is a diagram showing an example of the operation of the modulator of FIG. 3.
Figure 11 is a diagram showing an example of a sensor network.
Figure 12 is a diagram showing an example of the operation of a sensor network.

Hereinafter, embodiments of the present disclosure will be described clearly and in detail so that a person skilled in the art can easily practice the present disclosure.

Hereinafter, units, modules, layers, or functional blocks shown in the drawings used in the detailed description may be implemented in the form of software, hardware, or a combination thereof. By way of example, software may be machine code, firmware, embedded code, and application software. For example, the hardware may include an electrical circuit, an electronic circuit, a processor, a computer, an integrated circuit, integrated circuit cores, a pressure sensor, an inertial sensor, a microelectromechanical system (MEMS), a passive component, or a combination thereof. .

1 is a diagram illustrating a human body communication system according to an embodiment of the present disclosure. Referring to FIG. 1, the human body communication system 1000 may include a human body communication transmitting device 100 (hereinafter referred to as a transmitting device) and a human body communication receiving device 200 (hereinafter referred to as a receiving device). The human body communication system 1000 can transmit information from the transmitting device 100 to the receiving device 200 through a user (USER). In other words, the human body communication system 1000 can exchange signals and information using the conductive human body as a medium. However, the transmission medium of signals and information is not limited to the human body such as the user (USER), and can also be applied to living organisms such as animals and plants. For convenience of explanation, it is assumed that the transmission medium of the human body communication system 1000 is a user (USER, a human body).

The human body communication system 1000 can transmit and receive data or signals through capacitive-coupling and galvanic-coupling. In the electrostatic coupling method, the ground electrodes included in the transmitting device 100 and the receiving device 200 are open, and only the signal electrode is in contact with the user's human body to transmit and receive data. The electrostatic coupling method requires a separate virtual ground plane. Accordingly, the electrostatic coupling method can transmit data over long distances.

For example, electrostatic coupling can transmit data over long distances, enough to transmit signals throughout the entire human body. In the vanik coupling method, a pair of electrodes (eg, a signal electrode and a ground electrode) included in the transmitting device 100 and the receiving device 200 can transmit and receive data by simultaneously contacting the user's human body. Accordingly, the vanik combining method can stably transmit data over a relatively short distance.

The transmission device 100 may generate a transmission signal TS. The transmitting device 100 may generate information data corresponding to information or a message to be delivered to the receiving device 200. For example, the information data may include various information suitable for the purpose of the human body communication system 1000, such as image data, authentication data, and identification data. The transmitting device 100 can encode information data for error correction and modulate the amplitude, frequency, or phase of the encoded data to transmit information through a biological channel. The transmission signal (TS) will be understood as encoded and modulated information data.

The transmission device 100 may output the transmission signal TS to the user (USER). The transmitting device 100 may transmit the transmission signal TS by contacting the user (USER) or by being spaced apart from the epidermis of the human body at a small distance. For example, the transmission signal TS may be an analog signal, but is not limited thereto and may be a digital signal. The transmitting device 100 may be easily carried by the user (USER) or may be small enough to be injected into the user's (USER) internal organs (eg, digestive system).

For example, the transmitting device 100 may be attached to the user (USER) to maintain contact with the user (USER). The transmitting device 100 may be a portable device such as a mobile phone or a detachable wearable device such as a smart watch, glasses, and a necklace. Alternatively, the transmitting device 100 may be a device that can be taken, such as a capsule endoscope. Alternatively, the transmitting device 100 may be a fixed electronic device that can be in contact with the user (USER).

The user (USER) may receive the transmission signal (TS) from the transmission device 100 and transmit the reception signal (RS) to the reception device 200. Since the transmission signal TS is transmitted to the receiving device 200 through the human body, binding force on the signal can be secured. However, the transmitted signal (TS) is the received signal (RS) due to the resistance of the user (USER) itself, the electric field between the user (USER) and the transmitting device 100, and the electric field between the user (USER) and the receiving device 200. may be attenuated or delayed. In addition, the transmission signal (TS) may be subject to noise or interference from other users or external electronic devices adjacent to the user (USER), and the transmission signal (TS) may be converted to a reception signal (RS) according to various influences of the human body. It can be transformed.

The receiving device 200 may receive a receiving signal (RS) from a user (USER). The receiving device 200 may receive the receiving signal RS by contacting the user (USER) or being spaced apart from the epidermis of the human body at a small distance. For example, the received signal RS may be an analog signal, but is not limited thereto and may be a digital signal. The receiving device 200 may be easy for the user (USER) to carry, or may be small enough to be injected into the user's (USER) internal organs (eg, digestive system).

For example, the receiving device 200 may be attached to the user (USER) to maintain contact with the user (USER). The receiving device 200 may be a portable device such as a mobile phone or a detachable wearable device such as a smart watch, glasses, and a necklace. Alternatively, the receiving device 200 may be a device that can be taken, such as a capsule endoscope. Alternatively, the receiving device 200 may be a fixed electronic device that can be in contact with the user (USER).

The receiving device 200 may demodulate the received signal RS in order to restore the modulated amplitude, frequency, or phase of the received signal RS. The receiving device 200 may decode the demodulated data for error correction. As a result of decoding, errors in the received signal (RS) due to the biological channel can be corrected. The received signal (RS) may include interference induced from peripheral devices other than the transmitted signal (TS). If interference occurs within the transmission band, the desired signal cannot be properly separated even if the sensitivity of the receiving device 200 is high. Additionally, signals above a certain frequency of the transmission signal (TS) may be radiated outside the human body, and the radiated signals may cause interference to other users. Since human body communication is required to operate at lower power than general wireless communication, it may be difficult to use various encoding, decoding, and error correction techniques of wireless communication.

In one embodiment, the receiving device 200 may operate in a normal mode or a power saving mode. For example, normal mode may indicate that the receiving device 200 is performing an operation. Alternatively, the normal mode may indicate that the receiving device 200 is in a state in which only low-frequency signals (i.e., signals with a frequency in the low-frequency band) can be processed. In normal mode, most blocks are powered or can be powered on. Power saving mode may indicate that the receiving device 200 is not performing an operation and is waiting to perform an operation. Alternatively, the power saving mode may refer to a state in which low-frequency signals or high-frequency signals (i.e., signals with frequencies in the high-frequency band) can be processed. In the power saving mode, in order to reduce power consumption, except for some units (or power-on domains), the remaining units or blocks (or power-off domains) may not be provided with power or may be powered off.

For example, a power-on domain refers to units or blocks to which power is provided (or powered on) in a power saving mode. The power-on domain may include blocks that process header/wakeup signals or data in the receiving device 200. That is, the power-on domain may include blocks that process low-frequency signals in the receiving device 200. The power off domain refers to units or blocks that are not provided with power (or are powered off) in power saving mode. The power-off domain may include blocks that process user signals or data. That is, the power-off domain may include blocks that process high-frequency signals in the receiving device 200.

A human body communication system can transmit and receive data through contact between a user and a transmitting/receiving device. By utilizing the human body communication system, information that can be collected from the user's daily life can be easily converted into data. The human body communication system may form a sensor network with a plurality of other body communication devices. At this time, the human body communication system may be influenced by other human body communication devices around it. For example, a general human body communication system may experience interference problems due to other human body communication devices nearby. Alternatively, the receiving device of a general human body communication system may remain in the turn-on state, resulting in increased power consumption.

On the other hand, the human body communication system 1000 according to an embodiment of the present disclosure can reduce interference from other human body communication devices by using the radiation characteristics of human body communication. Accordingly, a human body communication system with improved reliability and low power is provided. The operating method of the transmitting device 100 and the receiving device 200 according to an embodiment of the present disclosure is described in more detail with reference to the drawings below.

Figure 2 is a graph for explaining the radiation characteristics of human body communication signals. Referring to Figure 2, the horizontal axis indicates frequency and the vertical axis indicates power. In the graph of FIG. 2, the signal transmitted within the human body is shown as a dashed line (v1), and the signal radiated outside the human body is shown as a solid line (v2). The frequency band corresponding to the first section T1 is a baseband, and the frequency band corresponding to the second section T2 is a passband.

As shown in Figure 2, the radiation characteristics of the human body communication signal are as follows. In the low-frequency baseband, there may be little or no signal radiated outside the body. At low frequencies, the baseband can transmit signals primarily through the human body. On the other hand, in the high-frequency passband, in addition to signals transmitted to the human body, there may be signals radiated outside the body.

The human body communication system according to an embodiment of the present disclosure can efficiently transmit signals by considering the radiation characteristics of the human body communication signals. For example, the transmitting device 100 may transmit wake-up information through a low-frequency signal and transmit user data through a low-frequency signal or a high-frequency signal.

FIG. 3 is a block diagram showing an example of the human body communication system of FIG. 1. Referring to FIGS. 1 and 3 , the human body communication system 1000 may include a transmitting device 100 and a receiving device 200. The transmitting device 100 and the receiving device 200 each correspond to the human body communication transmitting device 100 and the human body communication receiving device 200 of FIG. 1 . The channel (i.e., human body communication channel) shown in FIG. 2 will be understood as a living body, such as the user (USER) in FIG. 1.

The transmission device 100 may include a data generation circuit 110 and a modulator 130. The data generation circuit 110 generates information data. Information data includes information or messages to be transmitted to a receiving device according to the purpose of the human body communication system 1000. For example, information data may be automatically generated by the data generation circuit 110 during a preset time or according to an external request. For example, information data may be generated based on information acquired by a sensing or detection device provided inside the transmitting device 100, such as an image sensor (not shown). For example, information data may be generated based on information provided from an external electronic device (not shown), etc.

In one embodiment, the information data may include wake-up data (WD), header data (HD), and user data (UD). Wake-up data (WD) may be data requesting the receiving device 200 to switch from the power saving mode to the normal mode. That is, the receiving device 200 may switch from the power saving mode to the normal mode in response to the received signal (RS) including wake-up data (WD).

In one embodiment, the data generation circuit 110 may set master wakeup information (MAS WU), device wakeup information (DEV WU), or device identifier information of the wakeup data (WD). A more detailed description of the wake-up data (WD) is described in FIG. 6.

The modulator 130 modulates information data (eg, wakeup data (WD), header data (HD), or user data (UD)) to generate modulated data. For example, the modulator 130 may modulate digital pulses of information data according to channel characteristics. For example, the modulator 130 may convert the size, displacement, frequency, or phase of an analog signal corresponding to information data into an appropriate waveform form. The modulator 130 can modulate information data to suit the characteristics of human communication using the living body as a medium. The modulated data generated as a result of modulation corresponds to the transmission signal TS of FIG. 1.

In one embodiment, the transmitting device may further include an encoder. For example, the encoder may receive information data from the data generation circuit 110, perform an encoding operation on the information data to generate sign data, and provide the sign data to the modulator 130. The encoder may perform an encoding operation on information data for error detection or error correction. For example, the encoder may encode information data using a low density parity-check (LDPC) encoding method.

Modulated data or transmission signal (TS) is transmitted to the receiving device 200 through a human body communication channel (or biological channel). The transmitted signal (TS) can be transformed into a received signal (RS) by a biological channel. The received signal RS is transmitted to the receiving device 200, and the receiving device 200 may include a demodulator 210 and a data management circuit 230.

The demodulator 210 may demodulate the received signal (RS) modulated by the modulator 130 to suit the biological channel characteristics. The demodulator 210 may generate demodulated data by demodulating the received signal (RS).

The data management circuit 230 can manage demodulated data according to the purpose of the human body communication system 1000. For example, when data is provided to the receiving device 200 for the purpose of storing information, the data management circuit 230 may convert the demodulated data into a storable form and provide it to a memory (not shown). For example, if the human body communication system 1000 includes a capsule endoscope, the data management circuit 230 may convert demodulated data into image data and provide it to a display device (not shown).

Figure 4 is a block diagram showing the modulator of Figure 3 in more detail. Referring to Figures 1, 3, and 4, the modulator 130 includes a multiplexer 131, a header data modulator 132, a user data modulator 133, a multiplex switch 134, and a low frequency generator 135. , may include a high frequency generator 136, a switch 137, an electrode 138, and a controller 139. The modulator 130 may receive wake-up data (WD), header data (HD), and user data (UD) from the data generation circuit 110. The modulator 130 may transmit a transmission signal (TS) to a human body communication channel (or user).

The multiplexer 131 can receive wakeup data (WD) and header data (HD). The multiplexer 131 can multiplex wakeup data (WD) and header data (HD). The multiplexer 131 may operate under the control of the controller 139. For example, the multiplexer 131 may multiplex wakeup data (WD) and header data (HD) based on the first control signal output from the controller 139. Wakeup data (WD) may be transmitted to the header data modulator 132 through the multiplexer 131. Header data (HD) may be transmitted to the header data modulator 132 through the multiplexer 131.

The header data modulator 132 may receive header data (HD) or wakeup data (WD) from the multiplexer 131. The header data modulator 132 can modulate the received data. For example, the header data modulator 132 may modulate the received data into a human body communication header signal or a human body communication wake-up signal. The header data modulator 132 may operate under the control of the controller 139. For example, the header data modulator 132 may modulate the received data based on the second control signal output from the controller 139 to generate a modulated first signal. The header data modulator 132 may output the first modulation signal to the multiplexing switch 134. For example, the first modulation signal may indicate a modulated wakeup signal or a modulated header signal.

The user data modulator 133 may receive user data (UD) from the data generation circuit 110. The user data modulator 133 can modulate user data. For example, the user data modulator 133 may modulate the received data into a human communication user signal. The user data modulator 133 may operate under the control of the controller 139. For example, the user data modulator 133 may modulate user data based on the third control signal output from the controller 139 to generate a second modulation signal. The user data modulator 133 may output the second modulation signal to the multiplexing switch 134. For example, the second modulation signal may indicate a modulated user signal.

The multiplexing switch 134 may receive a first modulation signal from the header data modulator 132 and a second modulation signal from the user data modulator 133. The multiplexing switch 134 may perform a multiplexing or switching operation on the first and second modulation signals. For example, the multiplexing switch 134 may multiplex the first and second modulation signals. The multiplexing switch 134 can switch the first and second modulation signals. For example, the first modulation signal may be transmitted to the low frequency generator 135 through the multiplexing switch 134. The first modulation signal may be transmitted to the high frequency generator 136 through the multiplexing switch 134. The second modulation signal may be transmitted to the low frequency generator 135 through the multiplexing switch 134. The second modulation signal may be transmitted to the high frequency generator 136 through the multiplexing switch 134.

The multiplexing switch 134 may operate under the control of the controller 139. For example, the multiplexing switch 134 may perform a multiplexing operation or a switching operation based on the fourth control signal output from the controller 139 and the received signals. The multiplexing switch 134 may output a first modulation signal or a second modulation signal to the low frequency generator 135 or the high frequency generator 136.

The low frequency generator 135 may receive a first modulation signal or a second modulation signal from the multiplexing switch 134. The low-frequency generator 135 can convert the modulation signal into a signal transmitted in a low-frequency band. For example, the low-frequency generator 135 may generate a low-frequency signal based on the first modulation signal or the second modulation signal. The low-frequency signal may be a signal having a frequency in a low-frequency band. Low-frequency signals can be analog signals or digital signals. The low frequency generator 135 may operate under the control of the controller 139. For example, the low-frequency generator 135 may convert the first modulation signal or the second modulation signal into a low-frequency signal based on the fifth control signal output from the controller 139. The low-frequency generator 135 may transmit a low-frequency signal to the switch 137.

The high frequency generator 136 may receive a first modulation signal or a second modulation signal from the multiplexing switch 134. The high frequency generator 136 may convert the first modulation signal or the second modulation signal into a signal transmitted in a high frequency band. For example, the high frequency generator 136 may generate a high frequency signal based on the first modulation signal or the second modulation signal. The high-frequency signal may be a signal having a frequency in a high-frequency band. The high-frequency signal may be an analog signal or a digital signal. The high frequency generator 136 may operate under the control of the controller 139. For example, the high frequency generator 136 may convert the first modulation signal or the second modulation signal into a high frequency signal based on the sixth control signal output from the controller 139. The high frequency generator 136 may transmit a high frequency signal to the switch 137.

The switch 137 may receive a low-frequency signal from the low-frequency generator 135 or a high-frequency signal from the high-frequency generator 136. The switch 137 may transfer the received signal to the electrode 138. For example, the switch 137 may transmit a low-frequency signal to the electrode 138. The switch 137 can transmit a high-frequency signal to the electrode 138. The high frequency generator 136 may operate under the control of the controller 139. For example, the switch 137 may transmit a low-frequency signal to the electrode 138 or transmit a high-frequency signal to the electrode 138 based on the seventh control signal output from the controller 139.

The electrode 138 may receive a low-frequency signal or a high-frequency signal from the switch 137. The electrode 138 can transmit a transmission signal (TS) to the user. For example, the transmission signal TS may be a received low-frequency signal or a high-frequency signal. In one embodiment, electrodes 138 may be in contact with the user's body. When the electrode 138 is in contact with the user's body, the electrode 138 may output a transmission signal TS.

The controller 139 can control overall operations of the modulator 130. For example, the controller 139 may output first to ninth control signals. The controller 139 may output a transmission signal (TS) to the user based on wakeup data (WD), header data (HD), and user data (UD) through the first to ninth control signals.

In one embodiment, controller 139 may transmit the same signal repeatedly. For example, the controller 139 may control the low-frequency signal generated by the low-frequency generator 135 to be repeatedly transmitted. That is, the controller 139 may repeatedly transmit a low-frequency signal including wake-up data to provide highly reliable communication.

Figure 5 is a block diagram showing the demodulator of Figure 3 in more detail. 1, 3, and 5, the demodulator 210 includes an electrode 211, a low-frequency filter 212, a high-frequency filter 213, a switch 214, a header/wakeup data demodulator 215, It may include a user data demodulator 216, a header/wakeup data decoder 217, a user data decoder 218, a memory 219, and a controller 220.

The electrode 211 may receive a reception signal (RS) from the user. For example, the received signal RS may be a low-frequency signal or a high-frequency signal. In one embodiment, the electrode 211 may be in contact with the user's body. When the electrode 211 is in contact with the user's body, the electrode 138 can receive the reception signal RS. The electrode 211 may transmit the received signal RS to the low-frequency filter 212 or the high-frequency filter 213.

The low-frequency filter 212 may receive a reception signal from the electrode 211. The low-frequency filter 212 can filter signals in the low-frequency band based on the received signal. The low-frequency filter 212 may filter low-frequency signals from the received signal. The low-frequency filter 212 may operate under the control of the controller 220. For example, the low-frequency filter 212 may filter only low-frequency signals from the received signal based on the first control signal output from the controller 220. The low-frequency filter 212 can output the filtered low-frequency signal to the switch 214.

The high-frequency filter 213 may receive a reception signal from the electrode 211. The high-frequency filter 213 can filter signals in the high-frequency band based on the received signal. The high-frequency filter 213 may operate under the control of the controller 220. For example, the high-frequency filter 213 may filter only high-frequency signals from the received signal based on the second control signal output from the controller 220. The high-frequency filter 213 can output the filtered high-frequency signal to the switch 214.

The switch 214 may receive a low-frequency signal from the low-frequency filter 212 or a high-frequency signal from the high-frequency filter 213. Switch 214 may switch the received signal. The switch 214 may transfer the received signal to the header/wakeup data demodulator 215 or the user data demodulator 216. The switch 214 may operate under the control of the controller 220. For example, the switch 214 may perform a switching operation based on the third control signal output from the controller 220. Specifically, the switch 214 can transmit a low-frequency signal to the header/wakeup data demodulator 215. The switch 214 can transmit a high-frequency signal to the header/wakeup data demodulator 215. The switch 214 may transmit a low-frequency signal to the user data demodulator 216. The switch 214 may transmit a high-frequency signal to the user data demodulator 216.

The header/wakeup data demodulator 215 may receive a filtered high-frequency signal or a filtered low-frequency signal from the switch 214. The header/wakeup data demodulator 215 can demodulate the received signal. For example, the header/wakeup data demodulator 215 may demodulate a filtered low-frequency signal including wakeup data or header data. The header/wakeup data demodulator 215 is

It can operate under the control of the controller 220. For example, the header/wakeup data demodulator 215 may demodulate the received signal based on the fourth control signal output from the controller 220. Specifically, the header/wakeup data demodulator 215 may generate first demodulated data by demodulating the filtered low-frequency signal. The header/wakeup data demodulator 215 may output the first demodulated data to the header/wakeup data decoder 217. The first demodulated data may indicate demodulated wakeup data or demodulated header data.

The user data demodulator 216 may receive a filtered high-frequency signal or a filtered low-frequency signal from the switch 214. The user data demodulator 216 can demodulate the received signal. For example, the user data demodulator 216 may demodulate a filtered low-frequency signal containing user data. The user data demodulator 216 may demodulate a filtered high-frequency signal containing user data.

The user data demodulator 216 may operate under the control of the controller 220. For example, the user data demodulator 216 may demodulate the received signal based on the fifth control signal output from the controller 220. Specifically, the user data demodulator 216 may generate second demodulated data by demodulating the filtered low-frequency signal or the filtered high-frequency signal. The user data demodulator 216 may output second demodulated data to the user data decoder 218. The second demodulated data may indicate demodulated user data.

The header/wakeup data decoder 217 may receive first demodulated data from the header/wakeup data demodulator 215. The header/wakeup data decoder 217 can decode the first demodulated data. The header/wakeup data decoder 217 may generate first decoded data by performing a decoding operation on the first demodulated data. If an error is detected, an error correction operation can be performed to correct the error in the data.

The header/wakeup data decoder 217 may operate under the control of the controller 220. For example, the header/wakeup data decoder 217 may decode demodulated wakeup data or demodulated header data based on the sixth control signal output from the controller 220. The header/wakeup data decoder 217 may output the first decoded data to the memory 219. The first decrypted data may indicate decrypted header data or decrypted wakeup data.

The user data decoder 218 may receive second demodulated data from the user data demodulator 216. The user data decoder 218 may decode the second demodulated data. The user data decoder 218 may generate second decoded data by performing a decoding operation on the second demodulated data. If an error is detected, an error correction operation can be performed to correct the error in the data.

The user data decoder 218 may operate under the control of the controller 220. For example, the user data decoder 218 may decode the demodulated user data based on the seventh control signal output from the controller 220. The user data decoder 218 may output second decoded data to the memory 219. The second decrypted data may refer to decrypted user data.

The memory 219 may receive first decoded data from the header/wakeup data decoder 217 and receive second decoded data from the user data decoder 218. The memory 219 may store first decoded data and second decoded data. The memory 219 may transmit the stored data to the data management circuit 230. The memory 219 may operate under the control of the controller 220. For example, the memory 219 may store received data based on the eighth control signal output from the controller 220 and transmit the stored data to the data management circuit 230.

The controller 220 can control overall operations of the demodulator 210. For example, the controller 220 may output first to eighth control signals. The controller 220 stores wakeup data (WD), header data (HD), and user data (UD) in the memory 219 based on the received signal (RS) through the first to eighth control signals, and stores the data It may be transmitted to the management circuit 230.

In one embodiment, the receiving device 200 may receive a plurality of low-frequency signals including the same wake-up data. The receiving device 200 may perform a wake-up operation when a wake-up condition is satisfied based on at least one low-frequency signal among a plurality of low-frequency signals. The receiving device 200 may not process low-frequency signals subsequent to at least one low-frequency signal.

For example, the receiving device 200 may receive a first low-frequency signal including first wake-up data and receive a second low-frequency signal including first wake-up data. The receiving device 200 may determine whether the wake-up condition is satisfied based on the first low-frequency signal. If the wake-up condition is met, the controller 220 may not process the second low-frequency signal.

Figure 6 is a diagram showing an example of wake-up data. Referring to FIGS. 3 and 6 , the data generation circuit 110 may generate wake-up data (WD). The data generation circuit 110 may transmit wake-up data (WD) to the modulator 130. Wake-up data (WD) may be data requesting the receiving device 200 to switch from the power saving mode to the normal mode. For example, the receiving device 200 may switch from the power saving mode to the normal mode in response to a signal including wake-up data.

Wakeup data (WD) includes data rate information, master wakeup information (MAS WU), device wakeup information (DEV WU), type information, device identifier information, frame length information, header check sequence information, etc. It can be included. For example, device identifier information may be an attribute referenced to uniquely identify each receiving device.

Master wakeup information (MAS WU) can be used to wake up all human body communication receiving devices included in the network. For example, the transmitting device 100 (e.g., the data generating circuit 110) sends mask wake-up information (MAS WU) to the first device in order to wake up all human body communication receiving devices included in the network. It can be set to a value (for example, '1'). That is, when the mask wake-up information (MAS WU) is '1', the receiving device 200 can switch from the power saving mode to the normal mode regardless of the device identifier information.

The transmitting device 100 (e.g., data generation circuit 110) sets the mask wake-up information (MAS WU) to a second value (e.g., '0') in order to wake up only a specific receiving device. You can. That is, when the mask wake-up information (MAS WU) is '0', the receiving device 200 can switch from the power saving mode to the normal mode based on the device wake-up information (DEV WU) and device identifier information.

Device wake-up information (DEV WU) can be used to wake up a specific human communication receiving device. For example, the transmitting device 100 (e.g., the data generation circuit 110) sets the device wake-up information (DEV WU) to '1' to wake up a specific receiving device, and device identifier information can be set to point to the receiving device 200. That is, when the device wake-up information (DEV WU) is '1', the receiving device 200 can switch from the power saving mode to the normal mode when the device identifier information points to the receiving device 200. For example, if the device wake-up information (DEV WU) is '1' and the device identifier information included in the wake-up data (WD) and the pre-stored device identifier of the receiving device 200 are the same (or match), The receiving device 200 can wake up.

In other words, when the mask wake-up information (MAS WU) is '1', the receiving device 200 can switch from the power saving mode to the normal mode regardless of the device identifier information. If the mask wake-up information (MAS WU) is '0', the device wake-up information (DEV WU) is '1', and the device identifier information points to the receiving device 200, the receiving device 200 is in power saving mode. You can switch to normal mode.

FIGS. 7 and 8 are diagrams showing examples of the operation of the transmitting device of FIG. 3. Referring to FIG. 7, the transmitting device 100 may first transmit a signal including wakeup data (WD) to the receiving device 200. Afterwards, the transmitting device 100 may transmit a signal including user data (UD) to the receiving device 200. That is, the transmitting device 100 may transmit the transmitting signal TS including wakeup data WD to the receiving device 200 before transmitting the transmitting signal TS including user data UD. .

The modulator 130 may receive wake-up data (WD) from the data generation circuit 110. The header data modulator 132 may receive wakeup data (WD) through the multiplexer 131. The header data modulator 132 may modulate the wakeup data (WD) to generate a first modulation signal. The header data modulator 132 may output the first modulation signal to the multiplexing switch 134. The low frequency generator 135 may receive the first modulation signal through the multiplexing switch 134. The low-frequency generator 135 may convert the first modulation signal into a low-frequency signal. The low-frequency generator 135 may output a low-frequency signal to the switch 137. The electrode 138 can receive a low-frequency signal through the switch 137. The electrode 138 can provide a low-frequency signal as a transmission signal (TS) to the user.

The transmitting device 100 may wake up the receiving device 200 through a transmitting signal (TS) including wakeup data (WD). That is, the receiving device 200 may switch from the power saving mode to the normal mode in response to the transmission signal TS including wakeup data WD. Accordingly, the receiving device 200 can process not only low-frequency signals but also high-frequency signals.

Thereafter, referring to FIG. 8, the transmitting device 100 may transmit a transmission signal (TS) including user data (UD) to the receiving device 200. The transmission signal (TS) including user data (UD) may be a low-frequency signal or a high-frequency signal. For brevity of drawings and convenience of explanation, it is assumed that the transmission signal (TS) including user data (UD) is a high frequency signal.

The modulator 130 may receive user data (UD) from the data generation circuit 110. The user data modulator 133 may receive user data UD and modulate the user data UD to generate a second modulation signal. The user data modulator 133 may output the second modulation signal to the multiplexing switch 134. The high frequency generator 136 may receive the second modulation signal through the multiplexing switch 134. The high frequency generator 136 may convert the second modulation signal into a high frequency signal. The high frequency generator 136 can output a high frequency signal to the switch 137. The electrode 138 can receive a high-frequency signal through the switch 137. The electrode 138 can provide a high-frequency signal as a transmission signal (TS) to the user.

FIG. 9 is a flowchart showing an example of the operation of the receiving device of FIG. 3. 3 and 9, in step S110, the receiving device 200 receives a low-frequency signal including wake-up data (WD) as a receiving signal (RS) from the transmitting device 100 through the user's body. You can. For example, the receiving device 200 may receive a low-frequency signal including wake-up data (WD) through the electrode 211.

In step S120, the receiving device 200 may perform filtering/demodulation/decoding operations based on the received low-frequency signal. For example, the low-frequency filter 212 may filter the low-frequency signal received through the electrode 211. The header/wakeup data demodulator 215 may receive the low-frequency signal filtered through the switch 214. Alternatively, the header/wakeup data demodulator 215 may receive the low-frequency signal filtered directly from the low-frequency filter 212. The header/wakeup data demodulator 215 may demodulate the filtered low-frequency signal and generate demodulated wakeup data. The header/wakeup data demodulator 215 may output the demodulated wakeup data to the header/wakeup data decoder 217. The header/wakeup data decoder 217 may decode the demodulated wakeup data and generate decrypted wakeup data.

In step S130, the receiving device 200 may determine whether the master wakeup information (MAS WU) is '1'. If the master wake-up information (MAS WU) is '1', the receiving device 200 performs step S150, and if the master wake-up information (MAS WU) is '0', the receiving device 200 performs step S140. do. For example, the receiving device 200 may detect master wakeup information (MAS WU) from the decrypted wakeup data. When the master wakeup information (MAS WU) is '1', the receiving device 200 can wake up regardless of the device identifier information. When the master wakeup information (MAS WU) is '0', the receiving device 200 may perform a wakeup operation based on the device wakeup information (DEV WU) and device identifier information.

In step S140, the receiving device 200 may determine whether the device wakeup information (DEV WU) is '1' and determine whether the device identifier information points to the receiving device 200. For example, since the master wakeup information (MAS WU) is '0', the receiving device 200 can identify that the transmitting device 100 has transmitted a wakeup request to a specific receiving device. The receiving device 200 may detect device wake-up information (DEV WU) and device identification information from the decrypted wake-up data. If the device wakeup information (DEV WU) is '1' and the device identifier information points to the receiving device 200, the receiving device 200 proceeds to step S150.

The receiving device 200 may not perform a wakeup operation if the device wakeup information (DEV WU) is not '1' or if the device identifier information does not point to the receiving device 200. For example, if the device wake-up information (DEV WU) is not '1' or the device identifier information does not point to the receiving device 200, the receiving device 200 may receive low-frequency signals from other human body communications. It can be identified as a wake-up request for the device. Accordingly, the receiving device 200 may ignore the received low-frequency signal.

In step S150, the receiving device 200 may switch from power saving mode to normal mode. That is, the receiving device 200 can perform a wake-up operation. For example, a wake-up operation may refer to an operation of switching the mode from power saving mode to normal mode. The receiving device 200 may provide power to the power-off domain. Accordingly, the receiving device 200 can be in a state capable of processing not only low-frequency signals but also high-frequency signals.

In step S160, the receiving device 200 may receive a high frequency signal including user data (UD) or a low frequency signal including user data (UD) as a reception signal (RS). For example, the receiving device 200 may receive a low-frequency signal including user data (UD) or a high-frequency signal including user data (UD) through the electrode 211.

In step S170, the receiving device 200 may perform filtering/demodulation/decoding operations based on the received low-frequency/high-frequency signals. For example, assume that the receiving device 200 has received a high-frequency signal. The high-frequency filter 213 can filter the high-frequency signal received through the electrode 211. The user data demodulator 216 may receive the high-frequency signal filtered through the switch 214. The user data demodulator 216 may demodulate the filtered high-frequency signal and generate demodulated user data. The user data demodulator 216 may output the demodulated user data to the user data decoder 218. The user data decoder 218 may decode the demodulated user data and generate decrypted user data.

In step S180, the receiving device 200 may store the decrypted user data in the memory 219. In step S190, the receiving device 200 may switch from the normal mode to the power saving mode. That is, the receiving device 200 can perform a sleep operation. For example, a sleep operation may refer to an operation of switching the mode from normal mode to power saving mode. The receiving device 200 may not provide power to the power-off domain. Accordingly, the receiving device 200 may again be in a state where it can only process low-frequency signals.

As described above, the receiving device 200 may receive a low-frequency signal including wake-up data and perform a wake-up operation when the wake-up condition is met. The wake-up condition may include a case where the master wake-up information of the wake-up data is '1'. The wakeup condition may include a case where the device wakeup information of the wakeup data is '1' and the device identifier of the wakeup data is the same as the device identifier stored in the receiving device 200.

FIG. 10 is a diagram showing an example of the operation of the demodulator of FIG. 3. Referring to FIGS. 3 and 10 , in normal mode, the receiving device 200 may provide power to all units or blocks of the demodulator 210. However, in the power saving mode, the receiving device 200 may provide power to only some units or blocks within the demodulator 210. For example, in the power saving mode, the receiving device 200 may not provide power to the power off domain 221 and may provide power only to the power on domain.

In the power saving mode, the power-off domain 221 may include a high-frequency filter 213, a switch 214, a user data demodulator 216, a user data decoder 218, and a memory 219. In the power saving mode, the power-on domain may include an electrode 211, a low-frequency filter 212, a header/wakeup data demodulator 215, and a header/wakeup data decoder 217.

In one embodiment, the receiving device 200 may not provide power to the data management circuit 230 in a power saving mode. In the power saving mode, the power off domain 221 may further include a data management circuit 230.

As described above, the receiving device 200 may process a low-frequency signal including wake-up data (WD) in power saving mode. The receiving device 200 cannot process high-frequency signals in power saving mode. The receiving device 200 may switch from the power saving mode to the normal mode in response to a low-frequency signal including wake-up data (WD) from the transmitting device 100. The receiving device 200 may process a high-frequency signal including user data (UD) in normal mode. The receiving device 200 may process low-frequency signals including user data (UD) in normal mode. Accordingly, the human body communication system according to an embodiment of the present disclosure can reduce power consumption.

Figure 11 is a diagram showing an example of a sensor network. Figure 12 is a diagram showing an example of the operation of a sensor network. Referring to FIG. 11, the sensor network 2000 may include a plurality of human body communication devices D1 to D6. The human body communication device may include a human body communication transmitting device and a human body communication receiving device. The human body communication transmission device corresponds to the transmission device 100 described with reference to FIGS. 1 to 10. The human body communication receiving device corresponds to the receiving device 200 described with reference to FIGS. 1 to 10. The sensor network shown in FIG. 11 is illustrative, and the scope of the present disclosure is not limited thereto.

In one embodiment, the first human body communication device D1 may transmit a signal to the remaining human body communication devices D2 to D6. That is, the first human body communication device D1 may be a host. The second to sixth human body communication devices D2 to D6 may operate in a power saving mode. For example, since the second to sixth human body communication devices D2 to D6 cannot know when the first human body communication device D1 will transmit a signal, they may operate in a power saving mode to reduce power consumption. there is. The second to sixth human body communication devices D2 to D6 may not provide power to the power-off domain. The second to sixth human body communication devices D2 to D6 each include a low-frequency filter 212, a header/wakeup data demodulator 215, a header/wakeup data decoder 217, and a low-frequency filter 212 of the receiving device 200. and only controller 220 can provide power.

Referring to FIG. 12, the first human body communication device D1 may transmit a low-frequency signal including wake-up data WD in the first section T1. The first human body communication device D1 may transmit a high-frequency/low-frequency signal including user data UD in the second section T2. For example, the first human body communication device (D1) may transmit a low-frequency signal including 5 wake-up data (WD) to the second to sixth human body communication devices (D2 to D6) in the first section (T1). You can. Specifically, the first human body communication device D1 transmits a first low-frequency signal at a first time point t1, a second low-frequency signal at a second time point t2, and a first low-frequency signal at a third time point t3. 3 low-frequency signals can be transmitted, the fourth low-frequency signal can be transmitted at a fourth time point (t4), and the fifth low-frequency signal can be transmitted at a fifth time point (t5). The first human body communication device D1 may transmit first to nth low-frequency/high-frequency signals each including user data UD in the second section T2.

In one embodiment, in the sensor network 2000, in addition to the first human body communication device (D1), there are a total of 5 remaining human body communication devices (D2 to D6), so the first human body communication device (D1) is the remaining human body communication devices (D1). To wake up (D2~D6), a low frequency signal containing up to 5 wakeup data (WD) can be transmitted.

In one embodiment, the first human body communication device D1 may set the master wake-up information (MAS WU) included in the wake-up data (WD) of the first low-frequency signal to '1'. Since the master wake-up information (MAS WU) is '1', the second to sixth body communication devices D2 to D6 can switch from the power saving mode to the normal mode in response to the first low frequency signal. In this case, even if the first human body communication device (D1) transmits only the first low-frequency signal, it can wake up all the remaining body communication devices (D2 to D6). Accordingly, the first human body communication device D1 may not transmit the second to fifth low-frequency signals.

In one embodiment, the first human body communication device (D1) may wake up the remaining body communication devices (D2 to D6) without setting the master wakeup information (MAS WU) to '1'. In this case, the first human body communication device D1 may transmit all of the first to fifth low frequency signals to wake up the remaining human body communication devices D2 to D6. For example, the first low-frequency signal includes first wake-up data, the second low-frequency signal includes second wake-up data, the third low-frequency signal includes third wake-up data, and the fourth low-frequency signal includes fourth wake-up data, and the fifth low-frequency signal may include fifth wake-up data.

The mast wakeup information (MAS WU) of the first wakeup data is '0', the device wakeup information (DEV WU) of the first wakeup data is '1', and the device identifier information of the first wakeup data is '1'. It may refer to a second human body communication device. Mast wakeup information (MAS WU) of the second wakeup data is '0', device wakeup information (DEV WU) of the second wakeup data is '1', and device identifier information of the second wakeup data is '1'. It may refer to a third human body communication device. The mast wakeup information (MAS WU) of the third wakeup data is '0', the device wakeup information (DEV WU) of the third wakeup data is '1', and the device identifier information of the third wakeup data is '1'. It may refer to the fourth human body communication device. The mast wakeup information (MAS WU) of the fourth wakeup data is '0', the device wakeup information (DEV WU) of the fourth wakeup data is '1', and the device identifier information of the fourth wakeup data is '1'. May refer to the fifth human body communication device. The mast wakeup information (MAS WU) of the fifth wakeup data is '0', the device wakeup information (DEV WU) of the fifth wakeup data is '1', and the device identifier information of the fifth wakeup data is '1'. It may refer to the sixth human body communication device.

The second to sixth human body communication devices D2 to D6 may switch from the power saving mode to the normal mode in response to a low frequency signal including wake-up data. After switching to the normal mode, the second to sixth human body communication devices D2 to D6 can receive and process high-frequency/low-frequency signals including user data.

For example, the second human body communication device D2 may perform a wake-up operation in response to the first low-frequency signal. The third human body communication device D3 may perform a wake-up operation in response to the second low-frequency signal. The fourth human body communication device D4 may perform a wake-up operation in response to the third low-frequency signal. The fifth human body communication device D5 may perform a wake-up operation in response to the fourth low-frequency signal. The sixth human body communication device D6 may perform a wake-up operation in response to the fifth low-frequency signal.

Hereinafter, unlike the sensor network 2000 shown in FIG. 11, it is assumed that the sensor network includes only the first and second human body communication devices D1 and D2. It is assumed that the first human body communication device (D1) transmits a signal, and the second human body communication device (D2) receives the signal provided from the first human body communication device (D1).

In one embodiment, the first human body communication device (D1) transmits a low-frequency signal including wake-up data (WD) in the first section (T1) and includes user data (UD) in the second section (T2). It can transmit low-frequency/high-frequency signals. The first human body communication device D1 may transmit first to fifth low frequency signals in the first section T1.

The first human body communication device D1 may transmit first to fifth low frequency signals, each including the same first wake-up data, to the second human body communication device D2. That is, all of the first to fifth low-frequency signals may include the same first wake-up data. The mast wakeup information (MAS WU) of the first wakeup data is '0', the device wakeup information (DEV WU) of the first wakeup data is '1', and the device identifier information of the first wakeup data is '1'. It may refer to a second human body communication device. In other words, the first human body communication device D1 can transmit the same low-frequency signal repeatedly, preventing interference from other human body communication devices and providing highly reliable communication.

The second human body communication device D2 may receive first to fifth low-frequency signals. When the second human body communication device D2 normally receives at least one of the first to fifth low-frequency signals, it can switch the power saving mode to the normal mode. The second human body communication device D2 may not process the received low-frequency signals after receiving at least one low-frequency signal. For example, it is assumed that the second human body communication device D2 cannot normally receive the first low-frequency signal due to interference, and has normally received the second low-frequency signal. The second human body communication device D2 may perform a wake-up operation based on the first wake-up data included in the second low-frequency signal. That is, the device wake-up information (DEV WU) of the first wake-up data is '1', and the device identifier information of the first wake-up data points to the second human body communication device (D2), so the power saving mode is changed to normal mode. can be converted to . Since the second body communication device D2 performed a wake-up operation in response to the second low-frequency signal, it may not process the third to fifth low-frequency signals. The second human body communication device D2 may process low-frequency/high-frequency signals including user data UD in the second section T2.

The above-described contents are specific embodiments for carrying out the present disclosure. The present disclosure will include not only the above-described embodiments, but also embodiments that are simply designed or can be easily changed. In addition, the present disclosure will also include techniques that can be easily modified and implemented using the embodiments. Accordingly, the scope of the present disclosure should not be limited to the above-described embodiments, but should be determined by the claims and equivalents of the present invention as well as the claims described below.

1000: Human body communication system
100: Transmitting device
200: receiving device
110: data generation circuit
130: modulator
210: demodulator
230: data management circuit

Claims (17)

a data generation circuit that generates wakeup data, header data, and user data; and
Includes a modulator,
The modulator is
a header data modulator that modulates the wakeup data or the header data to generate a first modulation signal;
a user data modulator that modulates the user data to generate a second modulation signal;
a low-frequency generator outputting a low-frequency signal based on the first modulation signal or the second modulation signal; and
A human body communication transmission device comprising a high-frequency generator that outputs a high-frequency signal based on the first modulation signal or the second modulation signal. According to claim 1,
The modulator further includes an electrode that outputs the low-frequency signal or the high-frequency signal through a human body communication channel. According to claim 2,
The modulator is
a multiplexer that multiplexes the wakeup data and the header data and outputs the multiplexed data to a header data modulator;
a first switch transmitting the first modulation signal or the second modulation signal to the low frequency generator or the high frequency generator; and
A human body communication transmission device further comprising a second switch that transmits the high-frequency signal or the low-frequency signal to the electrode. According to claim 2,
The human body communication transmission device further includes a controller that controls the modulator to repeatedly output the low-frequency signal including the wake-up data through the electrode. According to claim 2,
The electrode outputs the low-frequency signal including the wake-up data to the human body communication channel, and then outputs the low-frequency signal including the user data or the high-frequency signal including the user data to the human body communication channel. A human body communication transmitting device that outputs. According to claim 1,
The wake-up data includes master wake-up information, device wake-up information, and device identifier information. According to claim 6,
In order to transmit a signal to a plurality of external human body communication receiving devices, the data generation circuit sets the master wake-up information to a first value. According to claim 6,
In order to transmit a signal to an external specific human body communication receiving device, the data generation circuit sets the master wake-up information to a second value, the device wake-up information to a first value, and the device identifier information is set to the first value. A human body communication transmitting device that is set to point to a specific external human body communication receiving device. An electrode that receives an incoming signal through a human body communication channel;
a low-frequency filter that filters low-frequency signals from the received signal and outputs the filtered low-frequency signal;
a high-frequency filter that filters a high-frequency signal from the received signal and outputs a filtered high-frequency signal;
a header/wakeup data demodulator that demodulates the filtered low-frequency signal and outputs first demodulated data;
a user data demodulator that demodulates the filtered low-frequency signal or the filtered high-frequency signal to output second demodulated data;
a header/wakeup data decoder that decodes the first demodulated data and outputs first decoded data;
a user data decoder that decodes the second demodulated data and outputs second decoded data;
a memory storing the first decoded data or the second decoded data; and
A controller that controls the operation of the electrode, the low-frequency filter, the high-frequency filter, the header/wakeup data demodulator, the user data demodulator, the header/wakeup data decoder, the user data decoder, and the memory. A human body communication receiving device comprising: According to clause 9,
The electrode receives a low-frequency signal containing wake-up data, and then receives a low-frequency signal containing user data or a high-frequency signal containing the user data. According to claim 10,
When the first decoded data is wake-up data and the wake-up condition is met, power is provided to the power-off domain and the human body communication receiving device switches from the power saving mode to the normal mode. According to claim 11,
The power off domain includes the high frequency filter, the user data demodulator, the user data decoder, and the memory. According to claim 11,
The wake-up condition includes a case where master wake-up information of the wake-up data is a first value. According to claim 11,
The wake-up condition includes a case where device wake-up information of the wake-up data is a first value and device identifier information of the wake-up data is the same as a stored device identifier. According to claim 11,
After switching from the power saving mode to the normal mode, when user data is stored in the memory, power is not provided to the power off domain and the human body communication receiving device switches back from the normal mode to the power saving mode. According to claim 11,
The power saving mode indicates a state in which only low-frequency signals can be processed, and the normal mode indicates a state in which low-frequency signals or high-frequency signals can be processed. According to claim 11,
When receiving a first low-frequency signal including first wake-up data and a second low-frequency signal including the first wake-up data, the controller operates based on the first low-frequency signal when the wake-up condition is met. , A human body communication receiving device that does not process the second low-frequency signal.

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