CN114362909A - Physiological signal collector and intelligent terminal same-frequency full-duplex communication system and method - Google Patents
Physiological signal collector and intelligent terminal same-frequency full-duplex communication system and method Download PDFInfo
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Abstract
The invention discloses a physiological signal collector and intelligent terminal co-frequency full duplex communication system and method, wherein an intelligent terminal modulation module in the system modulates a binary code stream output by a terminal on a carrier in a 2FSK mode, and an collector modulation module modulates the binary code stream output by a collector on the same carrier in a 2ASK mode; the intelligent terminal demodulation module and the collector demodulation module are respectively used for recovering and extracting the binary code stream transmitted by the other side; the collector is provided with an electric energy collection module for extracting electric energy from the carrier wave sent by the intelligent terminal, and the electric energy is used by the collector modulation module and the collector demodulation module. The collector and the intelligent terminal adopt the same carrier wave, realize the same-frequency full duplex communication based on the separation of the uplink and downlink signals in the characteristic domain, save a filter circuit for separating the uplink and downlink signals, do not need to be configured with a sending amplifier, depend on the intelligent terminal for power supply, and can realize the micro volume, low power consumption and low cost of the collector.
Description
Technical Field
The invention relates to the field of electronic communication, in particular to a single-channel same-frequency full-duplex communication system and method for a physiological signal collector and an intelligent terminal.
Background
A portable physiological signal collector (hereinafter, referred to as a collector), such as a bracelet-type or clip-type oximeter, a sphygmomanometer, etc., is often used in a mobile state, and therefore, if the collector is used by an intelligent mobile terminal such as a mobile phone, on one hand, the collector can perform efficient data processing and internet access by using its powerful computing capability and networking capability, and on the other hand, the collector can share its power supply and display device, so as to achieve the micro-volume and low cost of the physiological signal collector, facilitate the use of a user, and improve the profit margin of consumer electronics (which is a market characteristic of being cheap and portable), at this time, the low power consumption performance is particularly important, otherwise, the battery of the mobile terminal such as the mobile phone will not be burdened. In addition, the collector continuously transmits the collected physiological information data such as blood oxygen and blood pressure to the intelligent terminal, and meanwhile, the intelligent terminal continuously transmits the control instruction, the communication handshake instruction, the feedback information and the like of the user to the collector, so that the two are required to realize duplex communication, and certain instructions are not allowed to delay too much, so that the full-duplex communication party can efficiently and excellently meet the requirements. To realize full duplex communication, generally speaking, uplink (from collector to intelligent terminal) and downlink (from intelligent terminal to collector) must realize signal isolation in time domain, frequency domain, code domain or space domain, and two physical channels are needed to realize signal isolation in space domain; the signal isolation in the time domain and the code domain generally needs to adopt complex digital signal processing, digital logic circuits and other technologies, and needs to use a high-performance analog-to-digital converter and a digital signal processor, so that the circuit area is greatly increased, the power consumption is also greatly increased, and the nonlinear increase is realized along with the increase of the sampling rate and the processing rate, so that the design requirements of low power consumption and low cost are not allowed to be realized; thus, it appears that the only feasible approach under low power consumption micro-volume conditions is the traditional isolation of bi-directional signals in the frequency domain. However, in the conventional method, two carriers with sufficiently different operating frequencies are used to modulate the uplink and downlink baseband signals, so that more filters are required, and if a digital filter is used to achieve excellent performance, most of the filtering tasks can be shared (but generally, an analog filter is still indispensable), but a high-performance analog-to-digital converter and a digital signal processor are still required.
Therefore, using the traditional frequency domain to isolate bi-directional signals and all analog filters brings advantages for the implementation of low power design objectives, but brings disadvantages for the implementation of micro-volume design objectives. Another solution that can be discussed is to use baseband transmission and handshake protocols, however, there are three disadvantages: firstly, the communication mode belongs to half duplex, and the performance of the communication mode is less obvious than that of full duplex; secondly, the communication efficiency is seriously influenced by the complex communication protocol and the signaling ratio caused by the communication; thirdly, the spread of the involved technology to long-range communication will be limited, since it is well known that baseband communication is only suitable for short-range communication.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the defects in the prior art, the invention aims to provide a physiological signal collector and intelligent terminal same-frequency full-duplex communication system and method, which improve the traditional frequency-domain isolated bidirectional signal, realize same-frequency full-duplex communication in a characteristic domain based on the separation of uplink and downlink signals, and extract electric energy from an intelligent terminal carrier so as to realize the micro-volume, low power consumption and low cost of the collector.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme:
a physiological signal collector and intelligent terminal co-frequency full duplex communication system comprises:
the intelligent terminal modulation module is used for modulating a binary code stream output by the intelligent terminal on a carrier in a 2FSK mode;
the collector modulation module is used for modulating the binary code stream output by the collector on the same carrier in a 2ASK mode; the frequency of 2ASK modulation is consistent with the carrier frequency of 2FSK modulation, the amplitude of the carrier signal is changed by changing the load of the carrier signal, and the amplitude modulation index is less than 1;
the intelligent terminal demodulation module is used for recovering and extracting the binary code stream sent by the collector for the intelligent terminal to read;
the collector demodulation module is used for recovering and extracting the binary code stream sent by the intelligent terminal for the collector to read;
and the collector electric energy collection module is used for extracting electric energy from the carrier wave sent by the intelligent terminal modulation module and supplying the electric energy to the collector modulation module and the demodulation module.
Preferably, the intelligent terminal modulation module and the collector modulation module are connected through the same audio channel, and a downlink audio channel of the intelligent terminal is adopted to realize full-duplex communication.
Preferably, the amplitude modulation index of the 2ASK modulation is between 0.3 and 0.5.
Preferably, the collector modulation module comprises a baseband signal generator and a 2ASK modulator; the 2ASK modulator comprises an analog switch, the state of the analog switch is controlled according to a baseband signal, and when the analog switch is in an open circuit state, the load of a carrier signal is light and the amplitude is large; when the analog switch is in a short-circuit state, the load of the carrier signal is heavier and the amplitude is smaller.
Preferably, the collector electric energy collection module comprises a first transformer, a second transformer, a rectification circuit, a filter capacitor, a voltage regulator tube and a load; the input end of the rectifying circuit is the serial output end of the secondary of the first transformer and the second transformer, and the output end is connected with a filter capacitor, a voltage stabilizing tube and a load.
Preferably, the intelligent terminal modulation module comprises a baseband signal generator and a 2FSK modulator; the baseband signal generator outputs high and low levels according to the binary code stream, and the 2FSK modulator modulates the baseband signal output by the baseband signal generator on a carrier wave in a 2FSK mode.
Preferably, the intelligent terminal demodulation module comprises a triode, a charge-discharge capacitor, a discharge resistor, a blocking capacitor and a load; the base electrode of the triode is connected with a signal wire of a transmission channel, the collector electrode of the triode is connected with a power supply, the emitter electrode of the triode is respectively connected with a charging and discharging capacitor, a discharging resistor and a blocking capacitor, and the other end of the blocking capacitor is connected with a load.
Preferably, the collector demodulation module comprises a comparator, a coupling blocking capacitor, a first voltage division circuit, a second voltage division circuit, a pi-type band-stop filter, a triode, a charge and discharge capacitor, a discharge resistor, a blocking capacitor and a load; the positive phase input end of the comparator is connected with one end of a coupling blocking capacitor, the other end of the coupling blocking capacitor is connected with a transmission channel signal line, the first voltage division circuit performs half voltage division on the power supply voltage and then performs direct current bias on the positive phase input end of the comparator, and the second voltage division circuit performs half voltage division on the power supply voltage and then performs direct current bias on the negative phase input end of the comparator; the passband and the stopband of the pi-shaped band-stop filter respectively cover a certain carrier frequency of the 2FSK signal, and the 2FSK signal with constant envelope is converted into a signal with amplitude synchronously changing along with frequency; the output end of the comparator is connected with the input end of the pi-type band-resistance filter, the output end of the pi-type band-resistance filter is connected with the base electrode of the triode, the collector electrode of the triode is connected with the power supply, the emitter electrode of the triode is respectively connected with the charging and discharging capacitor, the discharging resistor and the blocking capacitor, and the other end of the blocking capacitor is connected with the load.
A harvester communication and power harvesting circuitry, comprising:
the modulation module is connected with the intelligent terminal through a transmission channel and is used for modulating the binary code stream output by the collector on a carrier in a 2ASK mode, the carrier is the same as the carrier which is sent by the intelligent terminal and is modulated in the 2FSK mode, the frequency of the 2ASK modulation is consistent with the carrier frequency of the 2FSK modulation, the amplitude of a carrier signal is changed by changing the load of the carrier signal, and the amplitude modulation index is smaller than 1;
the demodulation module is connected with the intelligent terminal through the same transmission channel and used for recovering and extracting the binary code stream sent by the intelligent terminal for being read by the collector;
and the electric energy collection module is connected with the same transmission channel and used for extracting electric energy from the carrier wave sent by the intelligent terminal and supplying the electric energy to the modulation module and the demodulation module of the collector.
The full-duplex communication method of the physiological signal collector and intelligent terminal co-frequency full-duplex communication system comprises the following steps: the intelligent terminal modulates a binary code stream carrying information on a carrier wave in a 2FSK mode and sends the binary code stream to the collector through a transmission channel; the collector carries out 2FSK demodulation on the signal sent by the intelligent terminal, and recovers and extracts a binary code stream carrying information; the collector modulates the binary code stream carrying information on the same dynamic carrier wave as the 2FSK mode in a 2ASK mode and sends the binary code stream to the intelligent terminal through the same transmission channel; and the intelligent terminal performs 2ASK demodulation on the signals sent by the collector, and recovers and extracts the binary code stream carrying the information.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1. the collector and the intelligent terminal adopt the same carrier wave, a filter circuit for separating uplink and downlink signals is omitted, and the micro-size, low power consumption and low cost of the collector are facilitated.
2. The full-duplex communication between the intelligent terminal and the collector can be realized only by adopting one downlink audio channel of the intelligent terminal, and the other channel can still be used for other purposes, such as transmitting voice signals or other data signals, if the former is adopted, the function loss (of earphones and microphones) of the original audio channel is reduced to the minimum, and if the latter is adopted, the overall data throughput rate can be greatly improved.
3. The mechanism that 2ASK modulation and charging complement each other enables collector 2ASK modulation not to consume electric energy all the time and to contribute to charging all the time.
4. The invention realizes the same-frequency full-duplex communication method suitable for long-distance wired communication based on the separation of uplink and downlink signals in the characteristic domain under the condition of time domain, frequency domain, space domain and code domain coincidence.
5. The collector transmitting circuit does not need to be provided with a transmitting amplifier, and is beneficial to the micro-size, low power consumption and low cost of the collector.
6. The collector is not required to be locally provided with a power circuit, the power supply of the collector depends on an intelligent terminal, the collector is favorable for realizing micro volume, low power consumption and low cost, and the inconvenience of battery replacement is avoided.
Drawings
Fig. 1 is a schematic structural diagram of a system according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of an embodiment of the present invention.
Fig. 3 is a Multisim simulation schematic diagram specifically illustrated in the embodiment of the present invention.
Fig. 4 is a diagram of a simulation result of the demodulation of the collector in the simulation example.
Fig. 5 is a diagram of a simulation result of the intelligent terminal demodulation in the simulation example.
Fig. 6 is a diagram of simulation results of collector power collection in a simulation example.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1, a same-frequency full-duplex communication system for a physiological signal collector (such as a bracelet or a clip oximeter) and an intelligent terminal (such as a mobile phone) provided in an embodiment of the present invention mainly includes five modules, namely an intelligent terminal modulation module, a demodulation module, a collector modulation module, a demodulation module, and an electric energy collection module. The intelligent terminal modulation module has the function of modulating a binary code stream (baseband signal) output by the intelligent terminal on a carrier in a 2FSK mode; the modulation module of the collector, its function is to modulate the collector output binary code stream (baseband signal) on the identity carrier in 2ASK mode; the intelligent terminal demodulation module has the function of recovering and extracting the binary code stream (baseband signal) sent by the collector for the reading processing of the intelligent terminal; the acquisition device demodulation module has the function of recovering and extracting the binary code stream (baseband signal) sent by the intelligent terminal for the acquisition device to read and process; and the collector electric energy collection module is used for extracting electric energy from the carrier wave sent by the intelligent terminal modulation module so as to be used by the local modulation and demodulation module.
The system components and the functions of the elements of the embodiment of the invention are explained in detail with reference to fig. 2, in which the first numbers of the intelligent terminal components are 1 and 3, and the first numbers of the collector components are 2, 4 and 6.
1. Intelligent terminal modulation module
BB 101: the intelligent terminal baseband signal generator is used for representing the binary code stream carrying information by using the output square wave signal (as a baseband), wherein the high level represents 1, the low level represents 0, and vice versa.
MOD 101: the intelligent terminal 2FSK modulator is configured to modulate a baseband signal output by the BB101 on a carrier in a binary frequency shift keying (2FSK) mode, increase a carrier frequency if the baseband signal is at a low level, decrease the carrier frequency if the baseband signal is at a high level, or perform frequency adjustment in reverse. The carrier frequency may be set to around 1MHz, e.g., 0.5MHz and 1.5 MHz.
R101: the internal impedance of the MOD101, when simulated, may be set to 50 Ω, which is generally used in general devices.
2. Modulation module of collector
BB 201: and the collector baseband signal generator is used for representing the binary code stream carrying the information by using the output square wave signal (as a baseband), wherein the high level represents 1, and the low level represents 0, or vice versa.
MOD 201: the collector 2ASK modulator is configured to modulate a baseband signal output by the BB101 on a carrier in a binary amplitude shift keying (2ASK) mode, and if the baseband signal is at a low level, the amplitude is increased, otherwise, the amplitude is decreased, and the amplitude may be adjusted in reverse. The 2ASK digital modulation in the embodiment of the present invention is different from the general 2ASK digital modulation (also called OOK, on off keying, i.e. on-off modulation), the former sets the amplitude modulation index between 0.3 and 0.5, and the latter sets the amplitude modulation index to 1, because the following considerations exist: if the am index is too large, the signal-to-noise ratio (SNR) of 2FSK is also greatly reduced in the 2ASK low amplitude period, thereby affecting the demodulation of 2 FSK. Here, the physical device used by the 2ASK modulator is an analog switch, and when the baseband signal is at a low level, the analog switch is in an open-circuit state, and at this time, the first transformer T601A becomes a load, and the load of the carrier signal is light, so that the carrier amplitude is large; when the baseband signal is at a high level, the analog switch is in a short-circuit state, and both the first transformer T601A and the second transformer T601B become loads, and the load of the carrier signal is heavy, so that the amplitude is small. No matter one transformer or two transformers become loads, the transformers do not consume electric energy in theory, however, the secondary side is always connected into the charging circuit, when one transformer becomes a load, the charging circuit is loaded by the secondary side with non-zero output, the charging voltage is small, and the charging amount is small; when the two transformers become loads, the two non-zero output secondary stages are connected in series and then load a charging circuit, the charging voltage is larger, and the charged electric quantity is larger. Therefore, when the 2ASK modulation occurs, not only electric energy is not consumed, but the 2ASK modulation always contributes to charging, and the embodiment of the invention realizes the 2ASK modulation and the electric energy collection based on the mechanism that the modulation and the charging complement each other.
The analog switch can adopt TS5A23157 type single-pole double-throw (SPDT) analog switch chip of Texas Instruments (TI), the range of the power supply voltage is 1.65V to 5.5V, the self leakage current is as low as mu A level (almost no leakage current), the maximum passing current is as high as 50mA, the output power of the mobile phone earphone jack is generally below 50mw, the impedance of the load earphone is 32 omega, and the output current is calculated to be about 38mA and less than 50mA, so that the high quality can meet the working requirement.
3. Intelligent terminal demodulation module
Q301: the triode and the peripheral device form a follower, and the follower is adopted based on the following consideration: the follower input resistance is large so that the current through the smart terminal demodulator is small, driving as much current as possible through the transformers T601A and T601B within the harvester power harvesting module to enhance power harvesting efficiency.
C301: and (3) charging and discharging the capacitor, when the amplitude of the carrier wave is increased to enable the positive bias voltage of the BE junction of the Q301 to exceed the threshold, the Q301 is conducted, the signal to BE demodulated charges the C301, and when the positive bias voltage of the BE junction of the Q301 is lower than the threshold, the C301 is discharged through the resistor R301.
R301: discharge resistance of C301.
The envelope of the 2ASK signal can be extracted by the three elements, and the 2ASK signal demodulation is realized. Further: c302 is a dc blocking capacitor, and R302 is the subsequent equivalent load resistance of the 2ASK signal demodulation output.
4. Demodulation module of collector
U401: the comparator can be formed by an operational amplifier with frequency characteristics suitable for carrier frequency, and has the following functions: firstly, the 2ASK modulation signal is clamped to eliminate amplitude modulation, and a 2FSK modulation signal with a constant envelope as pure as possible is output, and the working mechanism is as follows: if the voltage of the in-phase input end is higher than that of the reverse-phase input end, outputting a constant high level close to the voltage of a positive power supply, otherwise, if the voltage of the in-phase input end is lower than that of the reverse-phase input end, outputting a constant low level close to the voltage of a negative power supply, so that the output amplitude of the constant low level is constant, and forming a constant envelope signal; secondly, the input resistance of the intelligent terminal demodulator is very large, so that the current passing through the intelligent terminal demodulator is as small as possible, and the current as large as possible passes through the transformers T601A and T601B of the electric energy collector of the collector, so that the electric energy collection effect is enhanced; due to the requirement of micro volume, the electric energy collector of the collector is designed to only output positive voltage, so that the U401 is powered by a single power supply, and therefore, a proper direct-current voltage bias needs to be applied to the input end, and the method is realized by adopting the following resistors:
the resistors R401 and R402 form a first voltage division circuit, the resistance value is configured as large as possible (500 k omega is adopted for simulation), and after the power supply voltage of the U401 is divided by half, the direct current bias is carried out on the non-inverting input end of the U401.
The resistors R403 and R404 form a second voltage division circuit, the resistance value is configured as large as possible (500 k omega is adopted for simulation), and the inverting input end of the U401 is subjected to direct current bias after the supply voltage of the U401 is divided by half.
C401: and coupling a DC blocking capacitor.
C402: and coupling a DC blocking capacitor.
R405: the bandwidth adjusts the resistance.
L401 and C403, L402 and C404 are series resonance circuits, the resonance frequency is adjusted at the frequency point corresponding to the high level or low level of the base band of the 2FSK signal, and forms a pi-shaped band rejection filter together with C402 and R405, the pass band and the stop band of the filter cover a certain carrier frequency of the 2FSK signal respectively, when the frequency falls in the resistance band of the filter, the amplitude is reduced, otherwise, the amplitude is increased, thereby converting the 2FSK signal with constant envelope into a 2ASK amplitude modulation signal with the amplitude synchronously changing along with the frequency.
Q401: the triode and the peripheral device form a follower, and the follower is adopted based on the following consideration: the input resistance is large so as to increase the Q value of the front-stage resonant band elimination filter.
C405: and (3) charging and discharging the capacitor, when the amplitude of the carrier wave is increased to enable the BE junction forward bias voltage of Q401 to exceed the threshold, Q401 is conducted to charge C401, and otherwise C401 is discharged through a resistor R406.
R406: discharge resistance of C405.
The above elements can realize 2FSK signal demodulation, and in addition: c406 is a blocking capacitor, and R407 is a subsequent equivalent load resistor of the 2FSK signal demodulation output.
5. Electric energy collection module of collector
T601A, T601B: the inductance values of the primary and secondary of the transformer are 100 muH and 400 muH respectively, and the turn ratio is 1: 4, since the inductance value is not large, a patch type can be adopted to reduce the volume. The primary of T601A and T601B are in parallel (when the analog switch is closed) and the secondary is in series.
D601, D602, D603, and D604: the rectifier diode forms a bridge rectifier circuit, the input end of the bridge rectifier circuit is the secondary serial output end of the T601 and the T602, and the output end of the bridge rectifier circuit is connected with a subsequent filtering, voltage stabilizing and load circuit;
c601: the filter capacitor filters out alternating current components in the full-wave rectification signals at the secondary serial output ends of the T601A and the T601B so as to reduce the signal amplitude fluctuation as much as possible;
d605: a zener diode as a regulator tube to stabilize the dc voltage at a certain level (here, the universal supply voltage is 3.3V);
r601: the equivalent load of a circuit mainly comprising a microprocessor MPU assumes that an EFM32PG22 type MPU with low power consumption is adopted, the power supply voltage range is 1.71-3.8V, the output voltage of the collector power collection module is configured to be DC3.3V, and the power supply requirement of the MPU can be met; the operating current of the MPU of EFM32PG22 is 27uA/MHz, and the operating current is 110uA here, so the operating frequency can reach 4MHz or more, and therefore it is feasible to generate a sinusoidal carrier signal of up to 3MHz after filtering by a smoothing filter, and at this time, the equivalent load value is 3.3V/110uA — 30k Ω, and therefore the equivalent load R601 in the circuit diagram during simulation is set to 30k Ω.
The baseband signal generators BB101, BB201 and the 2FSK modulator MOD101 may be implemented by dedicated devices or according to the following method: the binary sequence of BB101 and BB201 baseband signals is stored in a memory of an MPU, the binary sequence of '0101 … 0101' is stored in the memory as a carrier, when a certain bit in the BB101 sequence is 0, a square wave with the frequency of 0.5MHz is output, when a certain bit in the sequence is 1, a square wave with the frequency of 1.5MHz is output, so that a 2FSK modulation signal is formed, then the modulation signal is input to a band-pass filter with the passband ranging from 0.45 MHz to 1.55MHz, harmonic components in the square wave are eliminated, and the 2FSK modulation signal with the sine wave as the carrier is output. When a bit in the BB201 sequence is 0, a bit of an I/O interface of the MPU is directly set to be high level, when a bit is 1, the bit is set to be low level, and the analog switch of the TS5A23157 type is controlled by the level to switch between a closed state and an open state, so that 2ASK modulation is realized. When the microprocessor adopts an EFM32PG22 type MPU chip of TI company, the inner core of the microprocessor is ARM Cortex-M4, and simultaneously supports DSP instructions and floating point units, so that the microprocessor has stronger computing capability, the highest working frequency of the microprocessor can reach 76.8MHz, therefore, the microprocessor can generate square waves with the frequency of 1.5MHz completely feasible, and can output more lower-frequency baseband square wave signals more than enough.
Fig. 3 is a circuit simulation diagram for verifying the effect of the embodiment of the present invention, and fig. 4 to 6 are simulation results of each oscilloscope.
In fig. 4, a first waveform is a modulation signal input to the demodulation module of the collector, a second waveform is a baseband signal generated by the collector, a third waveform is a baseband signal recovered by the collector demodulator from the first waveform, and a fourth waveform is a baseband signal sent by the intelligent terminal; the first and fourth waveforms show that when the fourth waveform is at low level, the first waveform oscillates at higher frequency, and when the fourth waveform is at high level, the first waveform oscillates at lower frequency, so that the 2FSK modulation of the intelligent terminal is successful; the first and second waveforms show that when the second waveform is low, the first waveform oscillates at a higher amplitude, and when the second waveform is low, the first waveform oscillates at a lower amplitude, so that the 2ASK modulation of the collector is successful; the third and fourth waveforms show that the baseband signals reflected by the two waveforms are in phase opposition, so that the 2FSK demodulation is successful.
In fig. 5, a first waveform is a modulation signal input to the intelligent terminal demodulation module, a second waveform is a baseband signal generated by the intelligent terminal, a third waveform is a baseband signal recovered by the intelligent terminal demodulation module from the first waveform, and a fourth waveform is a baseband signal sent by the collector. The third and fourth waveforms show that the baseband signals reflected by the two waveforms are in phase opposition, and thus the 2ASK demodulation is successful.
In fig. 6, the first waveform is the voltage on the equivalent load R601 of the harvester power harvesting module in the schematic diagram of the circuit, and the second waveform is the baseband signal sent by the harvester, which shows that the voltage on the load R601 rises to the target voltage of 3.3V in less than 8 ms, and when the baseband signal sent by the harvester is high, the rise is faster, because the transformer T601B is also injected with current at this time, and is connected in series with the transformer T601A and works simultaneously, and the result matches the expected result based on the circuit analysis.
Based on the same inventive concept, the collector communication and electric energy collection circuit system provided by the embodiment of the invention mainly comprises: the modulation module is connected with the intelligent terminal through a transmission channel and is used for modulating the binary code stream output by the collector on a carrier in a 2ASK mode, the carrier is the same as the carrier which is sent by the intelligent terminal and is modulated in the 2FSK mode, the frequency of the 2ASK modulation is consistent with the carrier frequency of the 2FSK modulation, the amplitude of a carrier signal is changed by changing the load of the carrier signal, and the amplitude modulation index is smaller than 1; the demodulation module is connected with the intelligent terminal through the same transmission channel and used for recovering and extracting the binary code stream sent by the intelligent terminal for being read by the collector; and the electric energy collection module is connected with the same transmission channel and used for extracting electric energy from the carrier wave sent by the intelligent terminal and supplying the electric energy to the modulation module and the demodulation module of the collector. The collector does not need to be configured with a power circuit locally. For details of the specific module, reference is made to the foregoing embodiments, which are not repeated herein. The signal acquisition circuit of the collector may adopt the existing commercial modules, such as a Photo-Plethysmography (PPG) -based blood oxygen acquisition module, a blood pressure acquisition module, a body temperature acquisition module, and the like, which are not described in detail herein.
The full-duplex communication method of the physiological signal collector and intelligent terminal co-frequency full-duplex communication system mainly comprises the following steps: the intelligent terminal modulates a binary code stream carrying information on a carrier wave in a 2FSK mode and sends the binary code stream to the collector through a transmission channel; the collector carries out 2FSK demodulation on the signal sent by the intelligent terminal, and recovers and extracts a binary code stream carrying information; the collector modulates the binary code stream carrying information on the same dynamic carrier wave as the 2FSK mode in a 2ASK mode and sends the binary code stream to the intelligent terminal through the same transmission channel; and the intelligent terminal performs 2ASK demodulation on the signals sent by the collector, and recovers and extracts the binary code stream carrying the information.
Claims (10)
1. The utility model provides a physiology signal collector and intelligent terminal with full duplex communication system of frequency which characterized in that includes:
the intelligent terminal modulation module is used for modulating a binary code stream output by the intelligent terminal on a carrier in a 2FSK mode;
the collector modulation module is used for modulating the binary code stream output by the collector on the same carrier in a 2ASK mode; the frequency of 2ASK modulation is consistent with the carrier frequency of 2FSK modulation, the amplitude of the carrier signal is changed by changing the load of the carrier signal, and the amplitude modulation index is less than 1;
the intelligent terminal demodulation module is used for recovering and extracting the binary code stream sent by the collector for the intelligent terminal to read;
the collector demodulation module is used for recovering and extracting the binary code stream sent by the intelligent terminal for the collector to read;
and the collector electric energy collection module is used for extracting electric energy from the carrier wave sent by the intelligent terminal modulation module and supplying the electric energy to the collector modulation module and the demodulation module.
2. The physiological signal collector and intelligent terminal co-frequency full-duplex communication system as claimed in claim 1, wherein the intelligent terminal modulation module and the collector modulation module are connected through the same audio channel, and a downlink audio channel of the intelligent terminal is adopted to realize full-duplex communication.
3. The physiological signal collector and intelligent terminal co-frequency full-duplex communication system as claimed in claim 1, wherein the amplitude modulation index of 2ASK modulation is between 0.3 and 0.5.
4. The physiological signal collector and intelligent terminal co-frequency full-duplex communication system according to claim 1, wherein the collector modulation module comprises a baseband signal generator and a 2ASK modulator; the 2ASK modulator comprises an analog switch, the state of the analog switch is controlled according to a baseband signal, and when the analog switch is in an open circuit state, the load of a carrier signal is light and the amplitude is large; when the analog switch is in a short-circuit state, the load of the carrier signal is heavier and the amplitude is smaller.
5. The physiological signal collector and intelligent terminal co-frequency full-duplex communication system according to claim 4, wherein the collector electric energy collection module comprises a first transformer, a second transformer, a rectifying circuit, a filter capacitor, a voltage regulator tube and a load; the input end of the rectifying circuit is the serial output end of the secondary of the first transformer and the second transformer, and the output end is connected with a filter capacitor, a voltage stabilizing tube and a load.
6. The physiological signal collector and intelligent terminal co-frequency full-duplex communication system according to claim 1, wherein the intelligent terminal modulation module comprises a baseband signal generator and a 2FSK modulator; the baseband signal generator outputs high and low levels according to the binary code stream, and the 2FSK modulator modulates the baseband signal output by the baseband signal generator on a carrier wave in a 2FSK mode.
7. The physiological signal collector and intelligent terminal co-frequency full-duplex communication system according to claim 1, wherein the intelligent terminal demodulation module comprises a triode, a charge-discharge capacitor, a discharge resistor, a blocking capacitor and a load; the base electrode of the triode is connected with a signal wire of a transmission channel, the collector electrode of the triode is connected with a power supply, the emitter electrode of the triode is respectively connected with a charging and discharging capacitor, a discharging resistor and a blocking capacitor, and the other end of the blocking capacitor is connected with a load.
8. The physiological signal collector and intelligent terminal co-frequency full-duplex communication system according to claim 1, wherein the collector demodulation module comprises a comparator, a coupling blocking capacitor, a first voltage division circuit, a second voltage division circuit, a pi-type band-stop filter, a triode, a charge-discharge capacitor, a discharge resistor, a blocking capacitor and a load; the positive phase input end of the comparator is connected with one end of a coupling blocking capacitor, the other end of the coupling blocking capacitor is connected with a transmission channel signal line, the first voltage division circuit performs half voltage division on the power supply voltage and then performs direct current bias on the positive phase input end of the comparator, and the second voltage division circuit performs half voltage division on the power supply voltage and then performs direct current bias on the negative phase input end of the comparator; the passband and the stopband of the pi-shaped band-stop filter respectively cover a certain carrier frequency of the 2FSK signal, and the 2FSK signal with constant envelope is converted into a signal with amplitude synchronously changing along with frequency; the output end of the comparator is connected with the input end of the pi-type band-resistance filter, the output end of the pi-type band-resistance filter is connected with the base electrode of the triode, the collector electrode of the triode is connected with the power supply, the emitter electrode of the triode is respectively connected with the charging and discharging capacitor, the discharging resistor and the blocking capacitor, and the other end of the blocking capacitor is connected with the load.
9. A collector communication and power collection circuit system, comprising: the modulation module is connected with the intelligent terminal through a transmission channel and is used for modulating the binary code stream output by the collector on a carrier in a 2ASK mode, the carrier is the same as the carrier which is sent by the intelligent terminal and is modulated in the 2FSK mode, the frequency of the 2ASK modulation is consistent with the carrier frequency of the 2FSK modulation, the amplitude of a carrier signal is changed by changing the load of the carrier signal, and the amplitude modulation index is smaller than 1;
the demodulation module is connected with the intelligent terminal through the same transmission channel and used for recovering and extracting the binary code stream sent by the intelligent terminal for being read by the collector;
and the electric energy collection module is connected with the same transmission channel and used for extracting electric energy from the carrier wave sent by the intelligent terminal and supplying the electric energy to the modulation module and the demodulation module of the collector.
10. The full-duplex communication method of the physiological signal collector and intelligent terminal co-frequency full-duplex communication system according to claims 1-8, comprising: the intelligent terminal modulates a binary code stream carrying information on a carrier wave in a 2FSK mode and sends the binary code stream to the collector through a transmission channel; the collector carries out 2FSK demodulation on the signal sent by the intelligent terminal, and recovers and extracts a binary code stream carrying information; the collector modulates the binary code stream carrying information on the same dynamic carrier wave as the 2FSK mode in a 2ASK mode and sends the binary code stream to the intelligent terminal through the same transmission channel; and the intelligent terminal performs 2ASK demodulation on the signals sent by the collector, and recovers and extracts the binary code stream carrying the information.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116032305A (en) * | 2023-03-29 | 2023-04-28 | 湖南大学 | Clock and data receiving circuit of artificial cochlea implantation chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116032305A (en) * | 2023-03-29 | 2023-04-28 | 湖南大学 | Clock and data receiving circuit of artificial cochlea implantation chip |
| CN116032305B (en) * | 2023-03-29 | 2023-06-23 | 湖南大学 | Clock and data receiving circuit of artificial cochlea implantation chip |
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