WO2022067682A1 - 多信号并行采集电路、电子装置及身体特征信号采集仪 - Google Patents

多信号并行采集电路、电子装置及身体特征信号采集仪 Download PDF

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Publication number
WO2022067682A1
WO2022067682A1 PCT/CN2020/119439 CN2020119439W WO2022067682A1 WO 2022067682 A1 WO2022067682 A1 WO 2022067682A1 CN 2020119439 W CN2020119439 W CN 2020119439W WO 2022067682 A1 WO2022067682 A1 WO 2022067682A1
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Prior art keywords
signal
analog
aliased
resistor
analog signal
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PCT/CN2020/119439
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English (en)
French (fr)
Inventor
焦旭
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焦旭
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Application filed by 焦旭 filed Critical 焦旭
Priority to CN202080002790.0A priority Critical patent/CN114600050B/zh
Priority to PCT/CN2020/119439 priority patent/WO2022067682A1/zh
Priority to TW110110395A priority patent/TWI769752B/zh
Publication of WO2022067682A1 publication Critical patent/WO2022067682A1/zh

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters

Definitions

  • the application belongs to the field of electronic equipment, and particularly relates to a multi-signal parallel acquisition circuit, an electronic device and a mattress.
  • an array composed of sensors of various specifications can be arranged on the mattress to detect the heartbeat, respiration and body movement signals of the human body.
  • sensor arrays of different specifications are used to separate small heartbeat and respiration signals from large body motion signals, but there is no mention of making a distinction between sampling circuits.
  • Body motion signals range from small signals such as heartbeats to very large signals, but what needs to be paid attention to is significant body movement.
  • the amplitude of the signal of significant body movement is several times, or even hundreds of times, the amplitude of the heartbeat and respiration signal. But significant body motion signals do not require high-precision sampling.
  • the present application provides a multi-signal parallel acquisition circuit, which is characterized by comprising: a first signal receiving end for receiving a first aliased signal, wherein the first aliased signal aliases the first analog signal and the second analog signal signal, the amplitude range of the first analog signal is greater than that of the second analog signal; a first signal amplifying unit amplifies the first aliased signal to obtain a first amplified signal; a first voltage reference, A bias voltage is provided for the first aliasing signal; a second signal receiving end receives a second aliasing signal, wherein the second aliasing signal aliases the third analog signal and the fourth analog signal, wherein the The third analog signal has the same origin as the first analog signal, and the fourth analog signal has the same origin as the second analog signal; a second signal amplifying unit amplifies the second aliased signal to obtain a second amplified signal; The second voltage reference provides a bias voltage for the second aliased signal; the analog-to-digital conversion unit
  • the present application also provides an electronic device, comprising a first sensor, coupled to a first signal source, to convert a preset physical quantity of the first signal source into a first aliased signal, wherein the first aliased signal includes The aliasing of the first analog signal and the second analog signal, the amplitude range of the first analog signal is greater than the amplitude range of the second analog signal; the second sensor, coupled with the first signal source, converts the The preset physical quantity of the first signal source is converted into a second aliased signal, wherein the second aliased signal includes the aliasing of the third analog signal and the fourth analog signal, wherein the third The analog signal is of the same origin as the first analog signal, and the fourth analog signal is of the same origin as the second analog signal; any one of the aforementioned circuits is connected to the first sensor and the second sensor.
  • the present application also provides a body feature signal acquisition instrument, including any of the foregoing electronic devices.
  • the signal amplification and offset of the acquisition circuit can be flexibly configured, so that the same analog acquisition circuit can be used to acquire multiple analog quantities with different signal amplitudes. Thereby, the cost can be reduced and the workload of the processor can be reduced.
  • the first aliased signal includes the aliasing of the first analog signal and the second analog signal. And the amplitude range of the first analog signal is greater than the amplitude range of the second analog signal. Therefore, the second analog signal is relatively weak and susceptible to interference.
  • the twinned signal of the first aliased signal and the second aliased signal are generated synchronously.
  • the second aliased signal includes a third analog signal and a fourth analog signal. The three analog signals are equivalent to the first analog signal, and the fourth analog signal is equivalent to the second analog signal.
  • different processing branch circuits are respectively configured for the signal processing of the first aliased signal and the signal processing of the second aliased signal, and respectively perform signal processing on the first analog signal and the fourth analog signal equal to the second analog signal. , can achieve more optimal processing for the two signals respectively.
  • different voltage references and amplification ratios are customized according to the different amplitude ranges of the first analog signal and the second analog signal, so that the two signals can be processed more optimally.
  • the amplitude of the body motion signal is relatively large and the processing precision is not required. Therefore, a lower performance device can be used in the branch circuit processing the first analog signal, thereby reducing the cost. And because the amplitude range of the first analog signal is greater than the amplitude range of the second analog signal. Although the first amplified signal contains a component of the second analog signal, this component is obviously small. Using the sampled value of the first amplified signal as the sampled value of the first analog signal can meet the signal acquisition accuracy requirement of the first signal.
  • the body motion signal is an occasional signal, when the amplitude of the first amplified signal is smaller than the first threshold, it can be considered that the body motion signal is not generated.
  • the first analog signal body motion signal
  • the second signal can be regarded as the amplification of the pure second analog signal.
  • the second amplified signal collected at this time can be used as the sampling value of the second analog signal.
  • the above circuit saves the signal decoupling circuit with complicated topology and the more expensive instrument amplifier circuit. Thereby, the complexity of the circuit can be reduced and the system cost can be reduced. Especially when the above circuit is applied to a body feature signal acquisition instrument, the acquisition instrument needs to arrange a plurality of sensors in an array form, and needs to process a relatively large number of analog signals. By using the above-mentioned circuit, the system complexity, manufacturing cost and maintenance cost of the collector can be relatively significantly reduced.
  • the aliased signals output by the two sensors are generally highly similar.
  • the two aliased signals can be compared to each other to determine whether one of the two sensors is functioning properly.
  • FIG. 1 shows a schematic diagram of the composition of a multi-signal parallel acquisition circuit according to an embodiment of the present application.
  • FIG. 2 shows a schematic diagram of the principle of a multi-signal parallel acquisition circuit according to another embodiment of the present application.
  • FIG. 3 shows a schematic diagram of the composition of an electronic device according to another embodiment of the present application.
  • FIG. 1 shows a schematic diagram of the composition of a multi-signal parallel acquisition circuit according to an embodiment of the present application.
  • the circuit 1000 may include: a first aliased signal receiving end 111 , a first voltage reference 112 , a first signal amplifying unit 113 , a second aliased signal receiving end 121 , a second voltage reference 122 , a second Signal amplification unit 123 and analog-to-digital conversion unit 13 .
  • the first aliasing signal receiving end 111 and the second aliasing signal receiving end 121 may be used to collect the first aliasing signal and the second aliasing signal, respectively.
  • the first aliasing signal may alias the first analog signal and the second analog signal.
  • the signal amplitude range of the first analog signal may be greater than the amplitude range of the second analog signal.
  • the second aliased signal may also alias the third and fourth analog signals.
  • the third analog signal can be of the same source as the first analog signal, that is, the third analog signal and the first analog signal can be converted from the same physical quantity of the same signal source, and the third analog signal and the first analog signal are highly similar, and can be equivalent to first analog signal.
  • the fourth analog signal can be of the same source as the second analog signal, that is, the fourth analog signal and the second analog signal can be converted from the same physical quantity from the same signal source, the fourth analog signal and the second analog signal can be highly similar, and can be equivalent to the first analog signal.
  • the first aliased signal and the second aliased signal may be highly similar.
  • the phase difference between the first aliased signal and the second aliased signal may differ by 180°.
  • at least one of the first aliased signal and the second aliased signal may come from a piezoelectric sheet.
  • the first aliased signal and the second aliased signal may be converted from the same physical quantity of the same signal source.
  • At least one of the first analog signal and the fourth analog signal may be an electrical signal. Further, at least one of the first analog signal and the fourth analog signal may be a voltage signal, a current signal, a resistance signal, a capacitance signal, or the like. Optionally, at least one of the first analog signal and the fourth analog signal may be a direct current signal or an alternating current signal.
  • At least one of the first analog signal and the fourth analog signal may be a heartbeat signal or a body motion signal.
  • the first analog signal may be a body motion signal
  • the fourth analog signal may be a heartbeat signal or a breathing signal, or an aliasing of the two.
  • the first voltage reference 112 may be electrically connected to the first aliased signal receiving end 111 and may provide a voltage bias for the first aliased signal.
  • the second voltage reference 122 may be electrically connected to the second aliased signal receiving end 121 and may provide a voltage bias for the second aliased signal.
  • the first signal amplifying unit 113 may be electrically connected to the first aliasing signal receiving end 111, and may be used for signal amplification of the first aliasing signal to obtain the first amplified signal.
  • the second signal amplifying unit 123 may be electrically connected to the second aliased signal receiving end 121 for signal amplification of the second aliased signal to obtain a second amplified signal.
  • the first voltage reference 112 and the first signal amplifying unit 113 may be configured according to the signal fluctuation range of the first analog signal.
  • the first voltage reference 112 may be configured such that the power supply voltage of the first signal amplifying unit 113 may be twice the voltage output value of the first voltage reference 112 .
  • Such a configuration can make full use of the optimal output range of the first signal amplifying unit. For example, when the first signal amplifying unit 113 is powered by a single power supply, the voltage value of the first voltage reference 112 may be half of the power supply voltage of the first signal amplifying unit 113 .
  • the first voltage reference 112 may be used to boost the first aliased signal, so that the median value of the signal fluctuation range of the boosted first aliased signal is equivalent to the median value of the power supply voltage of the first signal amplifying unit 113 .
  • the first voltage reference 112 may also boost the first amplified signal, so that the median value of the signal fluctuation range of the first amplified signal is equivalent to the median value of the power supply voltage of the first signal amplifying unit 113 .
  • the second voltage reference 122 and the second signal amplifying unit 123 may be configured according to the signal fluctuation range of the fourth analog signal.
  • the power supply voltage of the second signal amplifying unit 123 may be configured to be twice the output voltage of the second voltage reference 122 .
  • Such a configuration can make full use of the optimal output range of the second signal amplifying unit.
  • the voltage value of the second voltage reference 122 may be half of the power supply voltage of the second signal amplifying unit 123 .
  • the voltage value of the second voltage reference 122 may be the average value of the voltage of the positive terminal power supply and the negative terminal power supply voltage of the second signal amplifying unit 123 .
  • the second voltage reference 122 can be used to boost the second aliased signal, so that the median value of the signal fluctuation range of the second aliased signal is equivalent to the median value of the power supply voltage of the second signal amplifying unit 123 .
  • the second voltage reference 122 may also boost the second amplified signal, so that the median value of the signal fluctuation range of the second amplified signal is equivalent to the median value of the power supply voltage of the second signal amplifying unit 123 .
  • the voltage value of the first voltage reference 112 may be positively correlated with the signal fluctuation range of the first analog signal; the voltage value of the second voltage reference 122 may be positively correlated with the signal fluctuation range of the fourth analog signal.
  • the magnification of the first signal amplifying unit 113 may be negatively correlated with the signal fluctuation range of the first analog signal; the magnification of the second signal amplifying unit 123 may be negatively correlated with the signal fluctuation range of the fourth analog signal.
  • the analog-to-digital conversion unit 13 may be electrically connected to the first signal amplifying unit 113 and the second signal amplifying unit 123, respectively. And can be used to collect the first amplified signal and the second amplified signal.
  • the analog-to-digital conversion unit 13 may include two or more analog-to-digital conversion channels.
  • the analog-to-digital conversion unit 13 may include a higher-precision analog-to-digital conversion channel and a lower-precision analog-to-digital conversion channel, which are used to collect the first amplified signal and the second amplified signal, respectively.
  • the first amplified signal may be collected by using a lower-precision analog-to-digital conversion channel
  • the second amplified signal may be collected by using a higher-precision analog-to-digital conversion channel.
  • the voltage acquisition ranges of the two or more than two analog-to-digital conversion channels may all be the same or may be different from each other. Further, the signal collection range of the lower-precision analog-to-digital conversion channel may match the power supply voltage of the first signal amplifying unit 113 ; the signal collection range of the higher-precision analog-to-digital conversion channel may match the power supply voltage of the second signal amplifying unit 123 . .
  • the analog-to-digital conversion unit 13 may collect the first amplified signal as a sampled value of the first analog signal. When the first amplified signal is smaller than the first threshold, the analog-to-digital conversion unit 13 may collect the second amplified signal as a sample value of the fourth analog signal.
  • the circuit 1000 may also include a first resistor and a second resistor connected in series.
  • the first aliased signal receiving end 111 may be electrically connected to the first resistor; the first voltage reference 112 may be electrically connected to the second resistor.
  • the input terminal of the first signal amplifying unit 113 may be connected with the first resistor and the second resistor.
  • the circuit 1000 may further include a third resistor and a fourth resistor connected in series.
  • the second aliased signal receiving end 121 may be electrically connected to the third resistor; the second voltage reference 122 may be electrically connected to the fourth resistor.
  • the input terminal of the second signal amplifying unit 123 may be connected with the third resistor and the fourth resistor.
  • the circuit 1000 may further include a first follower connected between the first aliased signal receiving end 111 and the first resistor. And may include a second follower, connected between the second aliased signal receiving end 121 and the third resistor.
  • the circuit 1000 may further include a first filter connected between the first aliased signal receiving end 111 and the first resistor. and may include a second filter, which is connected between the second aliased signal receiving end 121 and the third resistor.
  • at least one of the first filter and the second filter may comprise a dual-T resistor-capacitor network.
  • the circuit 1000 may further include a first overvoltage protector connected to the first aliased signal receiving end 111 . And may include a second overvoltage protector connected to the second aliased signal receiving end 121 .
  • the circuit 1000 may further include: a 2xN-1th signal receiving end, receiving the 2xN-1th aliased signal, wherein the 2xN-1th aliased signal aliases the 4xN-3th analog signal signal and the 4xN-2th analog signal, the amplitude range of the 4xN-3th analog signal is greater than the amplitude range of the 4xN-2th analog signal, and N is an integer greater than 1.
  • the 2 ⁇ N-1 signal amplifying unit amplifies the 2 ⁇ N-1 aliased signal to obtain a 2 ⁇ N-1 amplified signal.
  • the 2xN-1th voltage reference provides a bias voltage for the 2xN-1th aliased signal.
  • the 2xNth signal receiving end receives the 2xNth aliased signal, wherein the 2xNth aliased signal aliases the 4xN-1th analog signal and the 4xNth analog signal.
  • the 2 ⁇ N signal amplifying unit amplifies the 2 ⁇ N aliased signal to obtain the 2 ⁇ N amplified signal.
  • the 2xNth voltage reference provides a bias voltage for the 2xNth aliased signal.
  • the analog-to-digital conversion unit collects the 2 ⁇ N-1 amplified signal as a sampling value of the 4 ⁇ N-3 analog signal, and when the 2 ⁇ N-1 amplified signal is smaller than a first threshold, the The analog-to-digital conversion unit collects the 2xNth amplified signal as a sample value of the 4xNth analog signal.
  • FIG. 2 shows a schematic diagram of the principle of a multi-signal parallel acquisition circuit according to another embodiment of the present application.
  • the first aliased signal receiving end 211 may be configured to receive the first aliased signal Vin1_in.
  • the first aliased signal receiving end 211 may include terminals or other connectors for connecting external sensors. Wherein, the external sensor can be used to provide the first aliased signal Vin1_in.
  • the first aliased signal receiving end 211 may also include a part of a terminal or a connector.
  • the first aliased signal receiving end 211 and the second aliased signal receiving end 221 may respectively include different pins of the same connector.
  • the first aliased signal receiving ends 211 are respectively connected to the ground GND of the first aliased signal Vin1_in.
  • the external sensor may be a piezoelectric sheet.
  • the first signal amplifying unit 213 may be configured to amplify the biased first aliased signal Vin1_in_buf to obtain a first amplified signal Vin1_large_out.
  • the first signal amplifying unit 213 may include an operational amplifier U2. As shown in the exemplary embodiment, the operational amplifier U2 can be powered by a single power supply consisting of a power supply VDD1 and a ground GND, and optionally the operational amplifier U2 can also be powered by a positive and negative dual power supply.
  • the signal fluctuation range of the first aliased signal Vin1_in may be relatively large, for example, the signal fluctuation range of the first aliased signal Vin1_in may be between ⁇ 1V.
  • the power supply VDD1 for powering the first signal amplifying unit 213 may be configured to be 24V.
  • the first voltage reference VREF1 can be configured to be half of the power supply VDD1, that is, 12V, and the signal fluctuation range of the first aliased signal Vin1_in_buf after the first voltage reference VREF1 provides a bias voltage bias can be 11-13V.
  • the first signal amplifying unit 213 may include a single-ended amplifying sub-circuit composed of an amplifier U2 , a resistor R6 and a resistor R7 . Since the signal fluctuation range of the first aliased signal Vin1_in is relatively large, an attenuator sub-circuit composed of a resistor R8 and a resistor R9 may be arranged after the aforementioned single-ended amplifying sub-circuit.
  • the first signal amplifying unit 213 may also adopt other topological structures.
  • the ratio of resistor R6 and resistor R7 can be configured to be 1:10, for example, resistor R6 can be configured to be 10K ⁇ , and resistor
  • the magnification of the single-ended amplifying sub-circuit is 11.
  • the other end of the resistor R6 may be connected to the first voltage reference VREF1.
  • the aforementioned single-ended amplifying sub-circuit is an amplifying circuit whose reference point is the first voltage reference VREF1.
  • the signal fluctuation range of the output end of the operational amplifier U2 may be 1-23V.
  • the resistor R8 and the resistor R9 can be configured to attenuate the signal at the output terminal of the operational amplifier U2 to obtain the first amplified signal Vin1_large_out.
  • the ratio of resistor R8 and resistor R9 can be configured to be 10:1, then the attenuation ratio of the attenuator sub-circuit is 1/11. That is, the total amplification factor of the first signal amplification unit 213 may be 1.
  • the resistor R8 can be configured to be 100K ⁇
  • the resistor R9 can be configured to be 10K ⁇
  • the signal fluctuation range of the first amplified signal Vin1_large_out can be 0.091-2.091V.
  • capacitor C5 can also be configured to be connected in parallel with resistor R7 to reduce noise.
  • the nominal value of capacitor C5 may be 100pF.
  • a decoupling capacitor (not shown) can be configured near the operational amplifier U2, and the decoupling capacitor can have a nominal value of 0.1 ⁇ F.
  • the circuit 2000 may include a first resistor R2 and a second resistor R1 connected in series for implementing voltage biasing of the first aliased signal Vin1_in.
  • the first resistor R2 may be connected to the first aliased signal receiving end 211, and the second resistor R1 may be connected to the first voltage reference VREF1.
  • the connection point of the first resistor R2 and the second resistor R1 may be connected to the input terminal of the first signal amplifying unit 213 .
  • the first resistor R2 can be configured to be 1K ⁇
  • the second resistor R1 can be configured to be 1M ⁇ .
  • other circuit topologies may also be used to provide a voltage bias for the first aliased signal Vin1_in.
  • a first follower 215 may be provided between the connection point of the first resistor R2 and the second resistor R1 and the input terminal of the first signal amplifying unit 213 .
  • the first follower 215 may include an operational amplifier U1.
  • the power supply of the operational amplifier U1 may be the same as the power supply of the first signal amplifying unit 213 , which is the power supply VDD1 .
  • a decoupling capacitor can be configured near the operational amplifier U1, and the nominal value of the decoupling capacitor can be 0.1 ⁇ F.
  • a first filter 216 may be provided between the connection point of the first resistor R2 and the second resistor R1 and the input terminal of the first signal amplifying unit 213 .
  • the first filter 216 may be a passive filter or an active filter.
  • the first filter 216 may be a high-pass filter or a low-pass filter.
  • the first filter 216 may also be a bandpass filter or a bandstop filter. A low pass filter is preferred to remove high frequency noise not related to body motion, respiration, heartbeat signals.
  • the first filter 216 may include a dual-T resistor-capacitor network.
  • the first filter 216 may include a double-T network consisting of a capacitor C1, a capacitor C2, a resistor R5, and a resistor R3, a resistor R4, a capacitor C3, and a capacitor C4.
  • the capacitor C1, the capacitor C2 and the resistor R5 may form the first T-type part of the first filter 216, and the reference terminal thereof may be the first voltage reference VREF1. That is, the resistor R5 may be connected to the first voltage reference VREF1.
  • the capacitor C1 and the capacitor C2 can both be 150nF, and the resistor R5 can be 20K ⁇ .
  • Resistor R3 , resistor R4 , and capacitors C3 and C4 connected in parallel may form a second T-shaped portion of first filter 216 .
  • Its reference terminal can be the ground GND, that is, the capacitor C3 and the capacitor C4 can be connected to the ground GND.
  • resistor R3 and resistor R4 may both be 49K ⁇ , and capacitor C3 and capacitor C4 may both be 150nF.
  • the first overvoltage protector 214 may be directly electrically connected to the first aliased signal receiving end 211 .
  • the first overvoltage protector 214 can be used to prevent input overvoltage of the piezoelectric sheet, to protect subsequent electronic devices, and to prevent destructive interference from the first aliased signal receiving end 211 from damaging the devices in the circuit 2000 .
  • Destructive disturbances can include static electricity.
  • the first overvoltage protector 214 may also include two diodes D1 and D2 respectively connected to the power supply VDD1 and the ground GND.
  • the first overvoltage protector 214 may also include a TVS diode, a discharge tube, a varistor and other devices.
  • the first overvoltage protector 214 may also adopt other topologies.
  • the second aliased signal receiving end 221 is similar to the first aliased signal receiving end 211, and the second overvoltage protector 224 may be similar to the first overvoltage protector 214, which will not be repeated.
  • circuit 2000 may also include a third resistor R12 and a fourth resistor R11.
  • the third resistor R12 and the fourth resistor R11 are respectively similar to the first resistor R2 and the second resistor R1, and will not be described repeatedly.
  • the second follower 225 and the second filter 226 may be similar to the first follower 215 and the first filter 216, respectively, and will not be described in detail.
  • the second signal amplifying unit 223 may be used to amplify the biased second aliased signal Vin2_in_buf, and obtain the second amplified signal Vin2_large_out.
  • the second signal amplifying unit 223 may include an operational amplifier U4.
  • the operational amplifier U4 can be powered by a single power supply composed of the power supply VDD1 and the ground GND, and optionally the operational amplifier U4 can also be powered by a positive and negative dual power supply.
  • the signal fluctuation range of the second aliased signal Vin2_in may be relatively small, for example, the range of the second aliased signal Vin2_in may be between ⁇ 10mV.
  • the power supply VDD1 for supplying power to the second signal amplifying unit 223 may be configured to be 3V.
  • the second voltage reference VREF2 can be configured to be 1.5V, then the signal fluctuation range of the second aliased signal Vin2_in_buf after the bias provided by the second voltage reference VREF2 can be 1.49-1.51V.
  • the second signal amplifying unit 223 may include a single-ended amplifying sub-circuit composed of an amplifier U4, a resistor R16 and a resistor R17.
  • the second signal amplifying unit 223 may also adopt other topological structures.
  • the ratio of resistor R16 and resistor R17 can be configured to be 1:100. For example, you can configure resistor R16 to be 1K ⁇ , and resistor
  • the other end of the resistor R16 may be connected to the second voltage reference VREF2. At this time, the amplifying circuit may take the second voltage reference VREF2 as a reference point.
  • a capacitor C15 can also be configured to be connected in parallel with the resistor R17 to reduce noise.
  • the nominal value of capacitor C15 may be 100pF.
  • a decoupling capacitor (not shown) can be configured near the operational amplifier U4, and the nominal value of the decoupling capacitor can be 0.1 ⁇ F.
  • the first amplified signal Vin1_large_out and the second amplified signal Vin2_large_out can be collected in time-division by using the same analog-to-digital conversion channel of the analog-to-digital conversion unit (not shown).
  • the first amplified signal Vin1_large_out and the second amplified signal Vin2_large_out may also be collected separately by using different analog-to-digital conversion channels.
  • FIG. 3 shows a schematic diagram of the composition of an electronic device according to another embodiment of the present application.
  • the electronic device 3000 may include: a first sensor 321 , a second sensor 322 and a circuit 31 .
  • the first sensor 32 coupled with a first signal source (not shown), converts a preset physical quantity of the first signal source into a first aliased signal, wherein the first aliased signal includes a first analog signal and a second For the aliasing of the analog signals, the amplitude range of the first analog signal is greater than the amplitude range of the second analog signal.
  • the first information source may be a preset part of the human body, and the preset physical quantity may be the pressure transmitted by the preset part of the human body to the sensor.
  • the second sensor 322 can also be coupled with the first signal source to convert the preset physical quantity of the first signal source into a second aliased signal, wherein the second aliased signal includes the aliasing of the third analog signal and the fourth analog signal.
  • the third analog signal may have the same origin as the first analog signal, and the fourth analog signal may have the same origin as the second analog signal.
  • the third analog signal is highly similar and can be identical to the first analog signal.
  • the fourth analog signal may be highly similar to the second analog signal, and may be identical to the second analog signal.
  • the first aliased signal and the second aliased signal are highly similar.
  • the first sensor 321 and the second sensor 322 may be a piezoelectric sheet, which may be used to convert pressure due to body motion, heartbeat and/or respiration into electrical signals.
  • the first sensor 321 and the second sensor 322 may be disposed at the same position. As shown in the example embodiment, the first sensor 321 and the second sensor 322 may be disposed on both sides of the circuit board 33 at the same position, respectively.
  • the first sensor 321 and the second sensor 322 may be connected in contact with the supporters 341 and 342, respectively.
  • the pressure can be simultaneously transmitted to the first sensor 321 and the second sensor 322 through conduction. Both are subject to the same pressure. In turn, the two can output the same or opposite (depending on the wiring method) electrical signals.
  • the circuit 31 is any one of the aforementioned circuits.
  • the circuit 31 may be connected with the first sensor 321 and the second sensor 322, respectively.
  • the first aliased signal from the first sensor 321 and the second aliased signal from the second sensor 322 are collected, respectively.
  • the first analog signal may include a body motion signal.
  • the second analog signal may include a heartbeat signal, a breathing signal, or an alias of both.
  • the electronic device may further include a processor (not shown).
  • the processor may be connected to the circuit 31 to obtain the sampled value of the first analog signal and the sampled value of the fourth analog signal.
  • the processor may further perform digital signal processing according to the sampled value of the first analog signal and the sampled value of the fourth analog signal. For example, the heartbeat signal and the respiration signal can be separated from the fourth analog signal.
  • the processor can effectively analyze the health information of the human body according to the body motion signal, the heartbeat signal and the breathing signal. and the analysis results that can show the analysis.
  • the same signal source is coupled by the first sensor 321 and the second sensor 322 . Therefore, the processor can use the circuit 31 to collect the first amplified signal and the second amplified signal, and determine whether the first sensor 321 is faulty by comparing the sampled value of the first amplified signal with the second amplified signal. Whether the second sensor 322 is faulty can also be determined according to the comparison result. Since the first aliased signal is highly similar to the second aliased signal, the magnification of the second amplifying unit is greater than that of the first amplifying unit. Therefore, when a certain amplitude of signal fluctuation occurs in the first amplified signal, the second amplified signal generally presents a square wave signal.
  • the second amplified signal in the circuit 31 fluctuates in a certain range, if the second amplified signal is not a square wave at this time, it can be judged that the second sensor is damaged. On the contrary, if the second amplified signal is in a square wave state and the first amplified signal does not have a sufficient fluctuation amplitude, it can be determined that the first sensor is damaged.
  • the wearing parts such as piezoelectric sheets can be effectively detected. Therefore, it can be effectively judged whether the electronic device 3000 is working normally, and the fault can be quickly located. Thus, the maintenance cost of the apparatus 3000 can be reduced.
  • the apparatus 3000 may further include a 2xN-1th sensor and a 2xNth sensor for providing a 2xN-1th aliasing signal and a 2xNth aliasing signal, respectively.
  • N is an integer greater than 1.
  • the 2xN-1th sensor and the 2xNth sensor may be coupled to the Nth signal source.
  • the N signal sources may be different parts of the human body in the form of a matrix.
  • the 2 ⁇ N sensors may be arranged in two layers.
  • the present application also provides a body feature signal acquisition instrument, including any one of the aforementioned electronic devices.
  • the body characteristic signals of each point of the human body arranged in a matrix are collected.
  • the acquisition instrument may also include a pad, which is in contact with the user's body and carries the first sensor and the second sensor in the aforementioned electronic device.
  • the mat may also carry other sensors of the aforementioned mat device.
  • the acquisition may be in the form of a mattress, a seat cushion, or other non-wearable sign signal detection devices.
  • the signal magnification and offset of the acquisition circuit can be flexibly configured, so that the same analog acquisition circuit can be used to acquire multiple analog quantities with different signal amplitudes. Thereby, the cost can be reduced and the workload of the processor can be reduced.
  • the first aliased signal includes the aliasing of the first analog signal and the second analog signal. And the amplitude range of the first analog signal is greater than the amplitude range of the second analog signal. Therefore, the second analog signal is relatively weak and susceptible to interference.
  • the twinned signal of the first aliased signal and the second aliased signal are generated synchronously.
  • the second aliased signal includes a third analog signal and a fourth analog signal. The three analog signals are equivalent to the first analog signal, and the fourth analog signal is equivalent to the second analog signal.
  • different processing branch circuits are respectively configured for the signal processing of the first aliased signal and the signal processing of the second aliased signal, and respectively perform signal processing on the first analog signal and the fourth analog signal equal to the second analog signal. , can achieve more optimal processing for the two signals respectively.
  • different voltage references and amplification ratios are customized according to the different amplitude ranges of the first analog signal and the second analog signal, so that the two signals can be processed more optimally.
  • the body motion signal is an occasional signal, when the amplitude of the first amplified signal is smaller than the first threshold, it can be considered that the body motion signal is not generated.
  • the first analog signal body motion signal
  • the second signal can be regarded as the amplification of the pure second analog signal.
  • the second amplified signal collected at this time can be used as the sampling value of the second analog signal.
  • the above circuit saves the signal decoupling circuit with complicated topology and the more expensive instrument amplifier circuit. Thereby, the complexity of the circuit can be reduced and the system cost can be reduced. Especially when the above circuit is applied to a body feature signal acquisition instrument, the acquisition instrument needs to arrange a plurality of sensors in an array form, and needs to process a relatively large number of analog signals. By using the above-mentioned circuit, the system complexity, manufacturing cost and maintenance cost of the collector can be relatively significantly reduced.
  • the aliased signals output by the two sensors are generally highly similar.
  • the two aliased signals can be compared to each other to determine whether one of the two sensors is functioning properly.

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Abstract

一种多信号并行采集电路、电子装置及身体特征信号采集仪，包括：第一信号接收端，接收第一混叠信号，其中第一混叠信号混叠第一模拟信号和第二模拟信号，第一模拟信号的幅值范围大于第二模拟信号的幅值范围；第一信号放大单元（113），放大第一混叠信号，得到第一放大信号；第一电压基准（112），为第一混叠信号提供偏置电压；第二信号接收端，接收第二混叠信号，其中第二混叠信号混叠第三模拟信号和第四模拟信号，其中第三模拟信号与第一模拟信号同源，第四模拟信号与第二模拟信号同源；第二信号放大单元（123），放大第二混叠信号，得到第二放大信号；第二电压基准（122），为第二混叠信号提供偏置电压；模数转换单元（13），采集第一放大信号和第二放大信号。

Description

多信号并行采集电路、电子装置及身体特征信号采集仪 技术领域
本申请属于电子设备领域，特别涉及一种多信号并行采集电路、一种电子装置及一种床垫。
背景技术
目前的现有技术中，可以在床垫上设置多种规格的传感器共同构成的阵列来检测人体的心跳、呼吸及体动信号。相关方案中，采用了不同规范的传感器阵列，从而将小型的心跳、呼吸信号与大型的体动信号分离开来，但并未提及对于采样电路也做出区分。
由于心跳、呼吸的振动信号小，但需要的采样精度高。体动信号从如心跳的小信号直到非常大的信号均有，但需要关注的是显著体动，显著体动的信号与心跳呼吸信号幅值差距几倍，甚至上百倍。但显著体动信号并不需要高精度的采样。
如果采用高精度的单一电路采集，必然导致成本大幅增加，在模拟电路中提高两个数量级的精度是会普遍导致成本增加。同时，在对信号进行并行处理时，需要在算法中将数量级不同的信号进行分离，这在高频、大阵列传感器信号处理中会大大增加处理器负担，信号处理成本也很高。
发明内容
基于此，本申请提供了一种多信号并行采集电路，其特征在于，包括：第一信号接收端，接收第一混叠信号，其中第一混叠信号混叠第一模拟信号和第二模拟信号，所述第一模拟信号的幅值范围大于所述第二模拟信号的幅值范围；第一信号放大单元，放大所述第一混叠信号，得到第一放大信号；第一电压基准，为所述第一混叠信号提供偏置电压；第二信号接收端，接收第二混叠信号，其中第二混叠信号混叠所述第三模拟信号和所述第四模拟信号，其中所述第三模拟信号与第一模拟信号同源，所述第四模拟信号与所述第二模拟信号同源；第二信号放大单元，放大所述第二混叠信号，得到第二放大信号；第二电压基准，为所述第二混叠信号提供偏置 电压；模数转换单元，采集所述第一放大信号作为所述第一模拟信号的采样值，当所述第一放大信号小于第一阈值时，所述模数转换单元采集所述第二放大信号作为所述第四模拟信号的采样值。
本申请还提供了一种电子装置，包括第一传感器，与第一信源耦合，把所述第一信源的预设物理量转换成第一混叠信号，其中所述第一混叠信号包括第一模拟信号和第二模拟信号的混叠，所述第一模拟信号的幅值范围大于所述第二模拟信号的幅值范围；第二传感器，与所述第一信源耦合，把所述第一信源的所述预设物理量转换成第二混叠信号，其中所述第二混叠信号包括所述第三模拟信号和所述第四模拟信号的混叠，其中所述第三模拟信号与第一模拟信号同源，所述第四模拟信号与所述第二模拟信号同源；前述任意一种电路与所述第一传感器和所述第二传感器连接。
本申请还提供了一种身体特征信号采集仪，包括前述任意一种电子装置。
利用上述电路、电子装置和床垫，可以通过灵活配置采集电路的信号放大倍率和偏置，从而可以实现利用相同的模拟量采集电路，采集多个信号幅度不同模拟量。从而可以降低成本，减少处理器的工作负担。
由于第一混叠信号包括第一模拟信号和第二模拟信号的混叠。且第一模拟信号的幅值范围大于第二模拟信号的幅值范围。因而第二模拟信号相对比较微弱容易受到干扰。在本申请中，同步产生第一混叠信号的孪生信号第二混叠信号。第二混叠信号包括第三模拟信号和第四模拟信号。其中三模拟信号等同于第一模拟信号，第四模拟信号等同于第二模拟信号。
在本申请中为第一混叠信号的信号处理和第二混叠信号的信号处理分别配置不同处理分支电路，分别针对第一模拟信号和等同于第二模拟信号的第四模拟信号进行信号处理，可以实现分别对两种信号更优化的处理。特别是在每个分支电路中，分别根据第一模拟信号和第二模拟信号幅值范围的不同，而定制化地采用不同的电压基准和放大倍率使得两种信号可以得到更优化的处理。
当第一模拟的信号为体动信号时，由于体动信号的幅度较大且处理精度要求不高。因而可以在处理第一模拟信号的分支电路中采用性能较低的器件，从而可以降低成本。又由于第一模拟信号的幅值范围大于第二模拟 信号的幅值范围。尽管第一放大信号中含有第二模拟信号的成分，但是该成分显然很小。把第一放大信号的采样值作为第一模拟信号的采样值，可以满足第一信号的信号采集精度要求。
由于体动信号为偶发信号，在第一放大信号的幅值小于第一阈值时，可以认为体动信号并未产生。此时第一混叠信号和第二混叠信号中并不含由第一模拟信号(体动信号)。此时第二信号可以看做是单纯第二模拟信号的放大。此时采集到的第二放大信号就可以作为第二模拟信号的采样值。
相对于传统方案，上述电路省去了拓扑结构复杂的信号解耦电路和价格较贵的仪用放大电路。从而可以降低电路的复杂度和减低系统成本。特别是在上述电路应用于身体特征信号采集仪时，由该采集仪需要以阵列形式排布多个传感器，需要处理相对繁多的模拟信号。利用上述电路可以相对明显地降低该采集仪的系统复杂度、制造成本以及维护成本。
在上述方案中，由于采用两个传感器同时感知相同的物理量。因而该两个传感器输出的混叠信号一般高度相似。可以利用两个混叠信号相互比对确定两个传感器中的一个是否工作正常。通过上述方式可实现设备自检和快速故障定位。从而可以降低维护成本。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，还可以根据这些附图获得其他的附图，而并不超出本申请要求保护的范围。
图1示出了本申请的一个实施例多信号并行采集电路的组成示意图。
图2示出了本申请的另一实施例多信号并行采集电路的原理示意图。
图3示出了本申请的另一实施例电子装置的组成示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的 范围。
图1示出了本申请的一个实施例多信号并行采集电路的组成示意图。
如图1所示，电路1000可以包括：第一混叠信号接收端111、第一电压基准112、第一信号放大单元113、第二混叠信号接收端121、第二电压基准122、第二信号放大单元123和模数转换单元13。
其中，第一混叠信号接收端111和第二混叠信号接收端121可以分别用于采集第一混叠信号和第二混叠信号。其中第一混叠信号可以混叠第一模拟信号和第二模拟信号。第一模拟信号的信号幅值范围可以大于第二模拟信号的幅值范围。第二混叠信号也可以混叠第三模拟信号和第四模拟信号。其中第三模拟信号可以与第一模拟信号同源，即第三模拟信号和第一模拟信号可以转换自同一信号源的同一物理量，且第三模拟信号和第一模拟信号高度相似，可以等同于第一模拟信号。第四模拟信号可以与第二模拟信号同源，即第四模拟信号可以与第二模拟信号转换自同一信号源的同一物理量，第四模拟信号和第二模拟信号可以高度相似，可以等同于第二模拟信号。第一混叠信号和第二混叠信号可以高度相似。
可选地第混叠信号和第二混叠信号可以存在相位差。进一步地，第一混叠信号的相位和第二混叠信号的相位可以相差180°。可选地，第一混叠信号和第二混叠信号中的至少一个可以来自于压电片。可选地，可选地，第一混叠信号和第二混叠信号可以转换自相同信源的同一物理量。
可选地，第一模拟信号和第四模拟信号中的至少一个可以为电信号。进一步地，第一模拟信号和第四模拟信号中的至少一个可以是电压信号、电流信号、电阻信号、电容信号等。可选地，第一模拟信号和第四模拟信号中的至少一个可以是直流信号也可以是交流信号。
可选地，第一模拟信号和第四模拟信号中的至少一个可以为心跳信号或者体动信号。比如第一模拟信号可以是体动信号，第四模拟信号可以是心跳信号或者呼吸信号，或者二者的混叠。
第一电压基准112可以与第一混叠信号接收端111电连接，并可以为第一混叠信号提供电压偏置。第二电压基准122可以与第二混叠信号接收端121电连接，并可以为第二混叠信号提供电压偏置。
第一信号放大单元113可以与第一混叠信号接收端111电连接，并可以 用于信号放大第一混叠信号，得到第一放大信号。第二信号放大单元123可以与第二混叠信号接收端121电连接，用于信号放大第二混叠信号，得到第二放大信号。
进一步地，第一电压基准112和第一信号放大单元113可以根据第一模拟信号的信号波动范围配置。可选地，第一电压基准112可以配置为第一信号放大单元113供电电压可以是第一电压基准112电压输出值的两倍。这样配置可以充分利用第一信号放大单元的最佳输出区间。比如，当第一信号放大单元113采用单电源供电时，第一电压基准112的电压值可以是第一信号放大单元113供电电源电压的一半。
第一电压基准112可以用于抬升第一混叠信号，使得抬升后的第一混叠信号的信号波动范围的中位值与第一信号放大单元113供电电压的中位值相当。可选地，第一电压基准112也可以抬升第一放大信号，使得第一放大信号的信号波动范围的中位值与第一信号放大单元113供电电压的中位值相当。
第二电压基准122和第二信号放大单元123可以根据第四模拟信号的信号波动范围配置。可选地，第二信号放大单元123供电电压可以配置为第二电压基准122输出电压的两倍。这样配置可以充分利用第二信号放大单元的最佳输出区间。比如，当第二信号放大单元123采用单电源供电时，第二电压基准122的电压值可以是第二信号放大单元123供电电源电压的一半。当第二信号放大单元123为双电源供电时，第二电压基准122的电压值可以是第二信号放大单元123正端供电电源电压和负端供电电源电压的均值。
第二电压基准122可以用于抬升第二混叠信号，使得第二混叠信号的信号波动范围的中位值与第二信号放大单元123供电电压的中位值相当。可选地，第二电压基准122也可以抬升第二放大信号，使得第二放大信号的信号波动范围的中位值与第二信号放大单元123供电电压的中位值相当。
进一步地，第一电压基准112的电压值可以与第一模拟信号的信号波动范围正相关；第二电压基准122的电压值可以与第四模拟信号的信号波动范围正相关。第一信号放大单元113的放大倍率可以与第一模拟信号的信号波动范围负相关；第二信号放大单元123的放大倍率可以与第四模拟 信号的信号波动范围负相关。
模数转换单元13可以分别与第一信号放大单元113和第二信号放大单元123电连接。并可以用于采集第一放大信号和第二放大信号。可选地，模数转换单元13可以包括两个或者两个以上模数转换通道。进一步地，模数转换单元13可以包括较高精度模数转换通道和较低精度模数转换通道，分别用于采集第一放大信号和第二放大信号。比如可以利用较低精度模数转换通道采集第一放大信号，利用较高精度模数转换通道采集第二放大信号。
该两个或者两个以上模数转换通道的电压采集范围可以均相同，也可以各不相同。进一步地，较低精度模数转换通道的信号采集范围可以与第一信号放大单元113的供电电压匹配；较高精度模数转换通道的信号采集范围可以与第二信号放大单元123的供电电压匹配。
模数转换单元13可以采集第一放大信号作为所述第一模拟信号的采样值。当所述第一放大信号小于第一阈值时，模数转换单元13可以采集所述第二放大信号作为第四模拟信号的采样值。
可选地，电路1000还可以包括串联连接的第一电阻器和第二电阻器。第一混叠信号接收端111可以与第一电阻器电连接；第一电压基准112可以与第二电阻器电连接。第一信号放大单元113的输入端可以与第一电阻器和第二电阻器连接。
可选地，电路1000还可以包括串联连接的第三电阻器和第四电阻器。第二混叠信号接收端121可以与第三电阻器电连接；第二电压基准122可以与第四电阻器电连接。第二信号放大单元123的输入端可以与第三电阻器和第四电阻器连接。
进一步地，电路1000还可以包括第一跟随器，连接于第一混叠信号接收端111与第一电阻器之间。以及可以包括第二跟随器，连接于第二混叠信号接收端121与第三电阻器之间。
进一步地，电路1000还可以包括第一滤波器，连接于第一混叠信号接收端111与第一电阻器之间。以及可以包括第二滤波器，连接于第二混叠信号接收端121与第三电阻器之间。可选地，第一滤波器和第二滤波器中的至少一个可以包含双T阻容网路。
可选地，电路1000还可以包括第一过压保护器，与第一混叠信号接收端111连接。以及可以包括第二过压保护器，与第二混叠信号接收端121连接。
可选地，电路1000还可以包括：第2×N-1信号接收端，接收第2×N-1混叠信号，其中第2×N-1混叠信号混叠第4×N-3模拟信号和第4×N-2模拟信号，所述第4×N-3模拟信号的幅值范围大于所述第4×N-2模拟信号的幅值范围，N为大于1的整数。第2×N-1信号放大单元，放大所述第2×N-1混叠信号，得到第2×N-1放大信号。第2×N-1电压基准，为所述第2×N-1混叠信号提供偏置电压。第2×N信号接收端，接收第2×N混叠信号，其中第2×N混叠信号混叠所述第4×N-1模拟信号和所述第4×N模拟信号。第2×N信号放大单元，放大所述第2×N混叠信号，得到第2×N放大信号。第2×N电压基准，为所述第2×N混叠信号提供偏置电压。模数转换单元，采集所述第2×N-1放大信号作为所述第4×N-3模拟信号的采样值，当所述第2×N-1放大信号小于第一阈值时，所述模数转换单元采集所述第2×N放大信号作为所述第4×N模拟信号的采样值。
图2示出了本申请的另一实施例多信号并行采集电路的原理示意图。
如图2所示，第一混叠信号接收端211可以用于接收第一混叠信号Vin1_in。第一混叠信号接收端211可以包括用于连接外部传感器的端子或者其他接插件。其中，该外部传感器可以用于提供第一混叠信号Vin1_in。可选地，第一混叠信号接收端211也可以包括端子或者接插件的一部分。比如，第一混叠信号接收端211和第二混叠信号接收端221可以分别包括同一接插件的不同引脚。
如示例实施例所示，第一混叠信号接收端211分别连接第一混叠信号Vin1_in地GND。其中，该外部传感器可以是压电片。
如图2所示，第一混叠信号Vin1_in经第一电压基准VREF1提供偏置后，可以得到偏置后的第一混叠信号Vin1_in_buf。第一信号放大单元213可以用于对偏置后的第一混叠信号Vin1_in_buf进行放大，并得到第一放大信号Vin1_large_out。第一信号放大单元213可以包括运算放大器U2。如示例实施例所示，运算放大器U2可以利用电源VDD1和地GND组成的单电源供电，可选地运算放大器U2也可以利用正负双电源供电。
可选地，第一混叠信号Vin1_in的信号波动范围可以比较大，比如第一混叠信号Vin1_in的信号波动范围可以为±1V之间。为第一信号放大单元213供电的电源VDD1可以配置为24V。并可以配置第一电压基准VREF1为电源VDD1的一半，即12V，则经过第一电压基准VREF1提供偏置电压的偏置后的第一混叠信号Vin1_in_buf的信号波动范围可以是11～13V。
如图2所示，可选地，第一信号放大单元213可以包括由放大器U2、电阻器R6和电阻器R7组成的单端放大子电路。由于第一混叠信号Vin1_in的信号波动范围比较大，因而可以在前述单端放大子电路之后设置由电阻器R8和电阻器R9组成的衰减子电路。可选地，第一信号放大单元213也可以采用其他的拓扑结构。
可以配置电阻器R6和电阻器R7的比值为1:10，比如可以配置电阻器R6为10KΩ，电阻器|R7为100KΩ。此时，前述单端放大子电路的放大倍率为11。电阻器R6的另一端可以连接第一电压基准VREF1。此时，前述单端放大子电路为以第一电压基准VREF1参考点的放大电路。此时，运算放大器U2的输出端的信号波动范围可以是1～23V。
可以配置电阻器R8和电阻器R9衰减运算放大器U2的输出端的信号，得到第一放大信号Vin1_large_out。可以配置电阻器R8和电阻器R9的比例为10:1，则衰减子电路的衰减倍率为1/11。即第一信号放大单元213的总放大倍率可以为1。比如：可以配置电阻器R8为100KΩ，电阻器R9为10KΩ，则第一放大信号Vin1_large_out的信号波动范围可以为0.091～2.091V。可选地，也可以配置电容C5，与电阻器R7并联，用于降低噪声。电容C5的标称值可以为100pF。可以在运算放大器U2附近配置去耦电容(未示出)，该去耦电容的标称值可以为0.1μF。
如图2所示，电路2000可以包括串联连接的第一电阻器R2和第二电阻器R1，用于实现第一混叠信号Vin1_in的电压偏置。如示例实施例所示，第一电阻器R2可以与第一混叠信号接收端211连接，第二电阻器R1可以与第一电压基准VREF1连接。第一电阻器R2和第二电阻器R1的连接点可以与第一信号放大单元213的输入端连接。可选地，可以配置第一电阻器R2为1KΩ，第二电阻器R1为1MΩ。可选地，也可以采用其他电路拓扑为第一混叠信号Vin1_in提供电压偏置。
如图2所示，可以在第一电阻器R2和第二电阻器R1的连接点与第一信号放大单元213的输入端之间设置第一跟随器215。可选地，第一跟随器215可以包括运算放大器U1。运算放大器U1的供电电源可以与第一信号放大单元213的供电电源相同，为电源VDD1。可以在运算放大器U1的附近配置去耦电容，该去耦电容的标称值可以是0.1μF。
如图2所示，可以在第一电阻器R2和第二电阻器R1的连接点与第一信号放大单元213的输入端之间设置第一滤波器216。可选地，第一滤波器216可以是无源滤波器，也可以是有源滤波器。可选地，第一滤波器216可以是高通滤波器、或者低通滤波器。第一滤波器216也可以是带通滤波器或者带阻滤波器。优选地是低通滤波器，以去除与体动、呼吸、心跳信号不相关的高频噪声。
可选地，第一滤波器216可以包括双T阻容网络。如示例实施例所示，第一滤波器216可以包括由电容器C1、电容器C2、电阻器R5以及电阻器R3、电阻器R4、电容器C3、电容器C4组成的双T网络。
其中，电容器C1、电容器C2和电阻器R5可以组成第一滤波器216的第一T型部分，其参考端可以为第一电压基准VREF1。即电阻器R5可以与第一电压基准VREF1连接。可选地，电容器C1、电容器C2可以均为150nF，电阻器R5可以为20KΩ。
电阻器R3、电阻器R4、以及并联连接的电容器C3和电容器C4可以组成第一滤波器216的第二T型部分。其参考端可以为地GND，即电容器C3和电容器C4可以连接地GND。可选地，电阻器R3和电阻器R4可以均为49KΩ，电容器C3和电容器C4可以均为150nF。
如图2所示，第一过压保护器214可以与第一混叠信号接收端211直接电连接。第一过压保护器214可以用于防止压电片输入过压，保护其后的电子器件，防止来自第一混叠信号接收端211的破坏性干扰破坏电路2000中的器件。破坏性干扰可以包括静电。如示例实施例所示，可选地，第一过压保护器214也可以包括两个二极管D1、D2分别连接电源VDD1和地GND。可选地，第一过压保护器214也可以包括TVS二极管、放电管、压敏电阻等器件。第一过压保护器214也可以采用其他拓扑结构。
如图2所示，第二混叠信号接收端221与第一混叠信号接收端211相 似，第二过压保护器224可以与第一过压保护器214相似，不做赘述。如电路2000也可以包括第三电阻器R12和第四电阻器R11。第三电阻器R12和第四电阻器R11分别与第一电阻器R2和第二电阻器R1相似，不做赘述。第二跟随器225和第二滤波器226可以分别与第一跟随器215和第一滤波器216相似不做赘述。
如图2所示，第二信号放大单元223可以用于信号放大偏置后的第二混叠信号Vin2_in_buf，并得到第二放大信号Vin2_large_out。第二信号放大单元223可以包括运算放大器U4。如示例实施例所示，运算放大器U4可以利用电源VDD1和地GND组成的单电源供电，可选地运算放大器U4也可以利用正负双电源供电。
可选地，第二混叠信号Vin2_in的信号波动范围可以比较小，比如第二混叠信号Vin2_in的范围可以为±10mV之间。此时，为第二信号放大单元223供电的电源VDD1可以配置为3V。并可以配置第二电压基准VREF2为1.5V，则经过第二电压基准VREF2提供偏置的偏置后的第二混叠信号Vin2_in_buf的信号波动范围可以是1.49～1.51V。
第二信号放大单元223可以包括由放大器U4、电阻器R16和电阻器R17组成的单端放大子电路。可选地，第二信号放大单元223也可以采用其他的拓扑结构。可以配置电阻器R16和电阻器R17的比值为1:100。比如：可以配置电阻器R16为1KΩ，电阻器|R17为100KΩ。则该放大电路的放大倍率可以为101。电阻器R16的另一端可以连接第二电压基准VREF2。此时，该放大电路可以以第二电压基准VREF2为参考点。此时，偏置后的第二混叠信号Vin2_in_buf经该放大电路放大后，得到的第二放大信号Vin2_large_out的信号波动范围可以是0.49～2.51V。可选地，也可以配置电容C15，与电阻器R17并联，用于降低噪声。电容C15的标称值可以是100pF。以及可以在运算放大器U4附近配置去耦电容(未示出)，该去耦电容的标称值可以为0.1μF。
由于第一放大信号Vin1_large_out的信号波动范围0.091～2.091V与第二放大信号Vin2_large_out的信号波动范围0.49～2.51V大体相当。因而可以利用模数转换单元(未示出)的同一模数转换通道分时地分别采集第一放大信号Vin1_large_out和第二放大信号Vin2_large_out。可选地，也可以 利用不同的模数转换通道分别采集第一放大信号Vin1_large_out和第二放大信号Vin2_large_out。
图3示出了本申请的另一实施例电子装置的组成示意图。
如图3所示，电子装置3000可以包括：第一传感器321、第二传感器322和电路31。
其中，第一传感器321，与第一信源(未示出)耦合，把第一信源的预设物理量转换成第一混叠信号，其中第一混叠信号包括第一模拟信号和第二模拟信号的混叠，第一模拟信号的幅值范围大于第二模拟信号的幅值范围。其中，第一信源可以是人体的预设部位，预设物理量可以是人体预设部位向传感器传递的压力。第二传感器322也可以与第一信源耦合，把第一信源的预设物理量转换成第二混叠信号，其中第二混叠信号包括第三模拟信号和第四模拟信号的混叠。其中，第三模拟信号可以与第一模拟信号同源，第四模拟信号可以与第二模拟信号同源。第三模拟信号高度相似，可以等同于第一模拟信号。第四模拟信号可以与第二模拟信号高度相似，可以等同于第二模拟信号。第一混叠信号和第二混叠信号高度相似。
可选地，第一传感器321和第二传感器322中的至少一个可以是压电片，可以用于把由于体动、心跳和/或呼吸产生的压力转换为电信号。可选地，第一传感器321和第二传感器322可以设置于相同位置。如示例实施例所示，第一传感器321和第二传感器322可以分别设置于电路板33的同一位置的两面。第一传感器321和第二传感器322可以分别与支撑物341和342接触连接。
当支撑物341承受来自箭头方向的压力时，该压力可以通过传导作用可以同时传递给第一传感器321和第二传感器322。使得二者承受相同的压力作用。进而可以使得二者输出相同的或者相反(取决于接线方式)的电信号。
电路31为前述任意一种电路。电路31可以分别与第一传感器321和第二传感器322连接。分别采集来自第一传感器321的第一混叠信号和来自第二传感器322的第二混叠信号。
可选地，该第一模拟信号可以包括体动信号。第二模拟信号可以包括心跳信号、呼吸信号或者二者的混叠。
可选地，该电子装置还可以包括处理器(未示出)。处理器可以与电路31连接，获取第一模拟信号的采样值和第四模拟信号的采样值。处理器还可以根据第一模拟信号的采样值和第四模拟信号的采样值进行数字信号处理。比如可以从第四模拟信号中分离心跳信号和呼吸信号。处理器该可以根据体动信号、心跳信号和呼吸信号对人体的健康信息进行有效的分析。以及可以展示该分析的分析结果。
可选地，由第一传感器321和第二传感器322耦合相同的信源。因而，处理器可以利用电路31采集第一放大信号和第二放大信号，并根据第一放大信号的采样值和第二放大信号相互比照，判断第一传感器321是否故障。也可以根据该比照结果判断第二传感器322是否故障。由于第一混叠信号与第二混叠信号高度相似，而第二放大单元的放大倍率大于第一放大单元的放大倍率。因而，当第一放大信号出现一定幅度的信号波动时，第二放大信号一般会呈现方波信号。当电路31中的第一放大信号的出现一定幅度的波动时，如果此时第二放大信号不是方波，则可以判断第二传感器损坏。反之，如果第二放大信号呈方波状态，而第一放大信号没有足够的波动幅度，则可以确定第一传感器损毁。
通过上述方式可以对压电片这种易损件进行有效检测。从而可以有效判断电子装置3000是否正常工作，以及可以快速地进行故障定位。从而可以降低装置3000的维护成本。
可选地，装置3000还可以包括第2×N-1传感器、第2×N传感器，分别用于提供第2×N-1混叠信号和第2×N混叠信号。其中N为大于1的整数。其可选地，第2×N-1传感器和第2×N传感器可以耦合第N信源。可选地该N个信源可以为人体呈矩阵形态的不同部位。该2×N个传感器可以呈两层的排布。
本申请还提供一种身体特征信号采集仪，包括，前述任意一种电子装置。采集矩阵排布的人体各点身体特征信号。可选地，该采集仪也可以包括垫子，与用户身体接触，并承载前述电子装置中的第一传感器和第二传感器。可选地，该垫子还可以承载前述垫子装置的其他传感器。可选地，该采集可以为床垫形式、坐垫形式、或者其他非穿戴体征信号检测装置。
利用上述电路、电子装置和床垫，可以通过灵活配置采集电路的信号 放大倍率和偏置，从而可以实现利用相同的模拟量采集电路，采集多个信号幅度不同模拟量。从而可以降低成本，减少处理器的工作负担。
由于第一混叠信号包括第一模拟信号和第二模拟信号的混叠。且第一模拟信号的幅值范围大于第二模拟信号的幅值范围。因而第二模拟信号相对比较微弱容易受到干扰。在本申请中，同步产生第一混叠信号的孪生信号第二混叠信号。第二混叠信号包括第三模拟信号和第四模拟信号。其中三模拟信号等同于第一模拟信号，第四模拟信号等同于第二模拟信号。
在本申请中为第一混叠信号的信号处理和第二混叠信号的信号处理分别配置不同处理分支电路，分别针对第一模拟信号和等同于第二模拟信号的第四模拟信号进行信号处理，可以实现分别对两种信号更优化的处理。特别是在每个分支电路中，分别根据第一模拟信号和第二模拟信号幅值范围的不同，而定制化地采用不同的电压基准和放大倍率使得两种信号可以得到更优化的处理。
由于体动信号为偶发信号，在第一放大信号的幅值小于第一阈值时，可以认为体动信号并未产生。此时第一混叠信号和第二混叠信号中并不含由第一模拟信号(体动信号)。此时第二信号可以看做是单纯第二模拟信号的放大。此时采集到的第二放大信号就可以作为第二模拟信号的采样值。
相对于传统方案，上述电路省去了拓扑结构复杂的信号解耦电路和价格较贵的仪用放大电路。从而可以降低电路的复杂度和减低系统成本。特别是在上述电路应用于身体特征信号采集仪时，由该采集仪需要以阵列形式排布多个传感器，需要处理相对繁多的模拟信号。利用上述电路可以相对明显地降低该采集仪的系统复杂度、制造成本以及维护成本。
在上述方案中，由于采用两个传感器同时感知相同的物理量。因而该两个传感器输出的混叠信号一般高度相似。可以利用两个混叠信号相互比对确定两个传感器中的一个是否工作正常。通过上述方式可实现设备自检和快速故障定位。从而可以降低维护成本。
以上对本申请实施例进行了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明仅用于帮助理解本申请的方法及其核心思想。同时，本领域技术人员依据本申请的思想，基于本申请的具体实施方式及应用范围上做出的改变或变形之处，都属 于本申请保护的范围。例如各电子元件的示例性数值均可以根据实际需要而进行调整。各电路模块的具体拓扑结构也可以做出各种改变或替代。综上所述，本说明书内容不应理解为对本申请的限制。

Claims (15)

  1. 一种多信号并行采集电路，其特征在于，包括：
    第一信号接收端，接收第一混叠信号，其中第一混叠信号混叠第一模拟信号和第二模拟信号，所述第一模拟信号的幅值范围大于所述第二模拟信号的幅值范围；
    第一信号放大单元，放大所述第一混叠信号，得到第一放大信号；
    第一电压基准，为所述第一混叠信号提供偏置电压；
    第二信号接收端，接收第二混叠信号，其中第二混叠信号混叠第三模拟信号和第四模拟信号，其中所述第三模拟信号与第一模拟信号同源，所述第四模拟信号与所述第二模拟信号同源；
    第二信号放大单元，放大所述第二混叠信号，得到第二放大信号；
    第二电压基准，为所述第二混叠信号提供偏置电压；
    模数转换单元，采集所述第一放大信号作为所述第一模拟信号的采样值，当所述第一放大信号小于第一阈值时，所述模数转换单元采集所述第二放大信号作为所述第四模拟信号的采样值。
  2. 根据权利要求1所述的电路，其特征在于，
    所述电路的第一电压基准的输出电压大于所述电路的第二电压基准的输出电压；
    所述电路的第一信号放大单元的放大倍率小于所述电路的第二信号放大单元的放大倍率。
  3. 根据权利要求1所述的电路，其特征在于，还包括：
    串联连接的第一电阻器和第二电阻器；
    串联连接的第三电阻器和第四电阻器；
    所述第一混叠信号接收端与所述第一电阻器连接；
    所述第一电压基准与所述第二电阻器连接；
    所述第一信号放大单元与所述第一电阻器和所述第二电阻器连接；
    所述第二混叠信号接收端与所述第三电阻器连接；
    所述第二电压基准与所述第四电阻器连接；
    所述第二信号放大单元与所述第三电阻器和所述第四电阻器连接。
  4. 根据权利要求3所述的电路，其特征在于，还包括：
    第一跟随器，连接于所述第一混叠信号接收端与所述第一电阻器之间；
    第二跟随器，连接于所述第二混叠信号接收端与所述第三电阻器之间。
  5. 根据权利要求3所述的电路，其特征在于，还包括：
    第一滤波器，连接于所述第一混叠信号接收端与所述第一电阻器之间；
    第二滤波器，连接于所述第二混叠信号接收端与所述第三电阻器之间。
  6. 根据权利要求5所述的电路，其特征在于，
    所述第一滤波器和所述第二滤波器中的至少一个包含双T阻容网络。
  7. 根据权利要求1所述的电路，其特征在于，所述双T阻容网络配置为低通滤波器。
  8. 根据权利要求1所述的电路，其特征在于，还包括：
    第一过压保护器，与所述第一混叠信号接收端连接；
    第二过压保护器，与所述第二混叠信号接收端连接。
  9. 一种电子装置，其特征在于，包括：
    第一传感器，与第一信源耦合，把所述第一信源的预设物理量转换成第一混叠信号，其中所述第一混叠信号包括第一模拟信号和第二模拟信号的混叠，所述第一模拟信号的幅值范围大于所述第二模拟信号的幅值范围；
    第二传感器，与所述第一信源耦合，把所述第一信源的所述预设物理量转换成第二混叠信号，其中所述第二混叠信号包括第三模拟信号和第四模拟信号的混叠，其中所述第三模拟信号与第一模拟信号同源，所述第四模拟信号与所述第二模拟信号同源；
    权利要求1-10中任意一项所述的电路，与所述第一传感器和所述第二 传感器连接。
  10. 根据权利要求9所述的电子装置，其特征在于，所述第一传感器和所述第二传感器中的至少一个为压电片。
  11. 根据权了要求9所述的电子装置，其特征在于，所述第一传感器和所述第二传感器设置于相同位置。
  12. 根据权利要求9所述的电子装置，其特征在于，还包括：
    处理器，与所述电路连接，接收所述第一模拟信号的采样值和所述第二模拟信号的采样值；
    所述处理器根据所述第一放大信号和所述第二放大信号的采样值确定所述第一传感器是否故障；。
    所述处理器根据所述第一放大信号的采样值和所述第二放大信号的采样值确定所述第二传感器是否故障。
  13. 根据权利要求9所述的电子装置，其特征在于，
    所述第一模拟信号为体动信号；
    所述第二模拟信号为心跳信号、呼吸信号或者心跳信号和呼吸信号的混叠。
  14. 一种身体特征信号采集仪，其特征在于，包括权利要求9-13中任意一项所述的电子装置。
  15. 根据权要求14所述的采集仪，其特征在于，包括：
    垫子，与用户身体接触，并承载所述电子装置中的第一传感器和第二传感器。
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