技术领域technical field
一种心肺拾音装置，特别是一种提取声音高保真的心肺拾音装置。A cardiopulmonary sound pickup device, in particular a cardiopulmonary sound pickup device for extracting sound with high fidelity.
背景技术Background technique
随着现代科技的不断发展，医生所采用的医疗设备也在不断的改进。医生所使用的传统听诊器因为声音的一过性，往往无法准确的分析患者健康状况而只能依靠医生的经验判断，但是由现代电子技术发展出来的电子听诊器具有提取声音并保存记录以利于分析研究的优点。电子听诊器利用电子技术放大身体听诊部位的声音，克服了噪音高的问题。电子听诊器转化拾取声波的电信号，然后进行放大和处理，以获得较好的听诊效果。With the continuous development of modern technology, the medical equipment used by doctors is also constantly improving. The traditional stethoscope used by doctors often cannot accurately analyze the patient's health status due to the transient nature of the sound and can only rely on the doctor's experience to judge. However, the electronic stethoscope developed by modern electronic technology has the ability to extract sound and save records for analysis and research. The advantages. The electronic stethoscope utilizes electronic technology to amplify the sound of the auscultation part of the body, overcoming the problem of high noise. The electronic stethoscope converts the electrical signal that picks up the sound wave, and then amplifies and processes it to obtain a better auscultation effect.
但是，现有的电子听诊器很容易受到环境噪音的干扰，而且心肺音主要集中在低频段，信号幅度又小，很容易出现拾音不稳定、噪音太大的问题。However, the existing electronic stethoscope is easily disturbed by environmental noise, and the heart and lung sounds are mainly concentrated in the low frequency band, and the signal amplitude is small, which is prone to problems of unstable sound pickup and too much noise.
因此，必须设计一种不容易受到干扰且声音保真度高的心肺拾音装置。Therefore, it is necessary to design a cardiopulmonary sound pickup device that is not susceptible to interference and has high sound fidelity.
发明内容Contents of the invention
为了解决上述问题，本发明提出了一种心肺拾音装置，用以提取心肺音信号，包括：压电薄膜传感器，用以感测心肺音信号并输出电荷信号；电荷放大模块，与所述压电薄膜传感器相连接并用以将电荷信号转化成电压信号；信号处理模块，用于与所述电荷放大模块相连接并输出处理信号，且所述信号处理模块包括用以对电压信号进行滤波的滤波模块及用以对电压信号进行放大的放大模块；输出模块，用以与所述信号处理模块相连接并将处理信号转化为音频信号以进行实时播放。In order to solve the above problems, the present invention proposes a cardiopulmonary sound pickup device for extracting cardiopulmonary sound signals, including: a piezoelectric film sensor for sensing cardiopulmonary sound signals and outputting charge signals; The electric film sensor is connected and used to convert the charge signal into a voltage signal; the signal processing module is used to connect with the charge amplification module and output the processing signal, and the signal processing module includes a filter for filtering the voltage signal module and an amplifying module for amplifying the voltage signal; an output module for connecting with the signal processing module and converting the processed signal into an audio signal for real-time playback.
作为本发明的进一步改进，所述压电薄膜传感器具有上电极及下电极，并且所述压电薄膜传感器受到外力后，上电极和下电极之间产生电荷信号。As a further improvement of the present invention, the piezoelectric film sensor has an upper electrode and a lower electrode, and after the piezoelectric film sensor receives an external force, a charge signal is generated between the upper electrode and the lower electrode.
作为本发明的进一步改进，所述电荷放大模块包括第一运算放大器、连接于第一运算放大器负输入端及输出端之间的反馈电容，所述第一运算放大器的负输入端及正输入端与所述压电薄膜传感器的上电极及下电极分别电性连接。As a further improvement of the present invention, the charge amplification module includes a first operational amplifier, a feedback capacitor connected between the negative input terminal and the output terminal of the first operational amplifier, the negative input terminal and the positive input terminal of the first operational amplifier It is electrically connected with the upper electrode and the lower electrode of the piezoelectric film sensor respectively.
作为本发明的进一步改进，所述放大模块包括两个级联的第一运算放大电路及第二运算放大电路。As a further improvement of the present invention, the amplifying module includes two cascaded first operational amplifier circuits and second operational amplifier circuits.
作为本发明的进一步改进，所述第二运算放大电路包括第四运算放大器及单刀双掷开关；所述单刀双掷开关的输入端通过第十一电阻与第四运算放大器的负输入端相连接，所述单刀双掷开关的第一输出端通过第十二电阻与第四运算放大器的输出端相连接，所述单刀双掷开关的第二输出端通过第十五电阻与第四运算放大器的输出端相连接。As a further improvement of the present invention, the second operational amplifier circuit includes a fourth operational amplifier and a single-pole double-throw switch; the input terminal of the single-pole double-throw switch is connected to the negative input terminal of the fourth operational amplifier through an eleventh resistor , the first output end of the SPDT switch is connected to the output end of the fourth operational amplifier through the twelfth resistor, and the second output end of the SPDT switch is connected to the fourth operational amplifier through the fifteenth resistor The output is connected.
作为本发明的进一步改进，所述经过所述滤波模块滤波后的处理信号的频率在20Hz至2000Hz之间。As a further improvement of the present invention, the frequency of the processed signal filtered by the filtering module is between 20 Hz and 2000 Hz.
作为本发明的进一步改进，所述滤波模块包括用以过滤低频电压信号的高通滤波模块及用于过滤高频电压信号的低通滤波模块。As a further improvement of the present invention, the filter module includes a high-pass filter module for filtering low-frequency voltage signals and a low-pass filter module for filtering high-frequency voltage signals.
作为本发明的进一步改进，所述低通滤波模块由两个二阶低通滤波电路级联而成。As a further improvement of the present invention, the low-pass filter module is formed by cascading two second-order low-pass filter circuits.
作为本发明的进一步改进，所述心肺拾音装置还包括存储模块，且与所述输出模块相连接用以存储音频信号。As a further improvement of the present invention, the cardiopulmonary sound pickup device further includes a storage module connected to the output module for storing audio signals.
作为本发明的进一步改进，所述输出模块包括用以将处理信号转换成音频信号的信号转化模块以及音频播放模块，所述音频播放模块包括可移动终端和/或音频外放设备。As a further improvement of the present invention, the output module includes a signal conversion module for converting the processed signal into an audio signal and an audio playback module, and the audio playback module includes a mobile terminal and/or an external audio playback device.
本发明的有益效果：通过压电薄膜传感器对心肺音进行检测，从而极大减少了心肺音检测过程中的环境噪音干扰，并且通过与电荷放大器进行配合，可减少压电薄膜传感器周围的电荷泄露，进一步提升本发明心肺拾音装置的声音保真度。Beneficial effects of the present invention: the heart-lung sound is detected by the piezoelectric film sensor, thereby greatly reducing the environmental noise interference in the heart-lung sound detection process, and by cooperating with the charge amplifier, the charge leakage around the piezoelectric film sensor can be reduced , to further improve the sound fidelity of the cardiopulmonary sound pickup device of the present invention.
附图说明Description of drawings
图1为本发明心肺拾音装置的流程示意图；Fig. 1 is the schematic flow sheet of cardiopulmonary sound pickup device of the present invention;
图2为本发明电荷放大模块及高通滤波模块的电路图；Fig. 2 is the circuit diagram of charge amplification module and high-pass filter module of the present invention;
图3为本发明放大模块的电路图；Fig. 3 is the circuit diagram of amplifying module of the present invention;
图4为本发明低通滤波模块的电路图。Fig. 4 is a circuit diagram of the low-pass filter module of the present invention.
具体实施例specific embodiment
为了使本技术领域的人员更好地理解本发明中的技术方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通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，都应当属于本发明保护的范围。In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
此外，在不同的实施例中可能使用重复的标号或标示。这些重复仅为了简单清楚地叙述本发明，不代表所讨论的不同实施例或结构之间具有任何关联性。Furthermore, repeated reference numerals or designations may be used in different embodiments. These repetitions are merely for the sake of simplicity and clarity of describing the present invention, and do not imply any relationship between the different embodiments or structures discussed.
如图1至4所示，本发明提供了一种心肺拾音装置，所述心肺拾音装置用以接收心肺音信号。心肺音即为心音、肺音，心肺音的能量主要集中在低频段，尤其是肺音信号幅度相对心音更小，因此就对心肺拾音装置的声音保真度具有较高的要求。As shown in FIGS. 1 to 4 , the present invention provides a cardiopulmonary sound pickup device for receiving cardiopulmonary sound signals. Heart and lung sounds are heart sounds and lung sounds. The energy of heart and lung sounds is mainly concentrated in the low frequency band, especially the amplitude of the lung sound signal is smaller than that of heart sounds. Therefore, there are higher requirements for the sound fidelity of the heart and lung sound pickup device.
如图1所示，本发明中的心肺拾音装置具体包括：As shown in Figure 1, the cardiopulmonary sound pickup device among the present invention specifically comprises:
压电薄膜传感器，用以感测心肺音信号并输出电荷信号；The piezoelectric film sensor is used to sense the cardiopulmonary sound signal and output the charge signal;
电荷放大模块，与所述压电薄膜传感器相连接并用以将电荷信号转化成电压信号；A charge amplification module, connected to the piezoelectric film sensor and used to convert the charge signal into a voltage signal;
信号处理模块，用于与所述电荷放大模块相连接并输出处理信号，且所述信号处理模块包括用以对电压信号进行滤波的滤波模块及用以对电压信号进行放大的放大模块；A signal processing module, configured to be connected to the charge amplification module and output a processing signal, and the signal processing module includes a filtering module for filtering the voltage signal and an amplification module for amplifying the voltage signal;
输出模块，用以与所述信号处理模块相连接并将处理信号转化为音频信号以进行实时播放。The output module is used for connecting with the signal processing module and converting the processed signal into an audio signal for real-time playback.
从而，所述压电薄膜传感器可将心肺音的振动感测到，并通过电荷放大模块对电荷信号进行处理，经过一系列的放大滤波等处理后，再最终进行实时播放。从而，通过采用压电薄膜传感器和电荷放大模块的配合，可使得对心肺音的声音拾取高保真。Therefore, the piezoelectric film sensor can sense the vibration of the heart and lung sounds, and the charge signal is processed by the charge amplification module, and after a series of processing such as amplification and filtering, it is finally played in real time. Therefore, through the cooperation of the piezoelectric film sensor and the charge amplification module, high-fidelity sound pickup of heart and lung sounds can be achieved.
具体的，所述压电薄膜传感器具有上电极和下电极，并且所述压电薄膜传感器受到外力后，上电极和下电极之间产生电荷。所述压电薄膜传感器所产生的电荷信号与该压电薄膜传感器拉伸或弯曲的形变呈一定比例，并且压电薄膜传感器对动态应力非常敏感。由于压电薄膜传感器厚度很薄且质量较轻，柔性大，因此可以广泛的应用于医用传感器中。Specifically, the piezoelectric film sensor has an upper electrode and a lower electrode, and when the piezoelectric film sensor is subjected to an external force, charges are generated between the upper electrode and the lower electrode. The charge signal generated by the piezoelectric film sensor is proportional to the stretching or bending deformation of the piezoelectric film sensor, and the piezoelectric film sensor is very sensitive to dynamic stress. Since the piezoelectric film sensor is very thin, light in weight and flexible, it can be widely used in medical sensors.
如图2所示，所述电荷放大模块包括第一运算放大器U1、连接于第一运算放大器U1负输入端及输出端之间的反馈电容C1，所述第一运算放大器U1的负输入端及正输入端与所述压电薄膜传感器的上电极及下电极分别电性连接。具体的，所述第一运算放大器U1的负输入端通过第一电阻R1与压电薄膜传感器的上电极连接，第一运算放大器U1的正输入端通过第三电阻R3与压电薄膜传感器的负电极连接。As shown in FIG. 2 , the charge amplification module includes a first operational amplifier U1 , a feedback capacitor C1 connected between the negative input terminal and the output terminal of the first operational amplifier U1 , and the first operational amplifier U1 The negative input terminal and the positive input terminal are respectively electrically connected with the upper electrode and the lower electrode of the piezoelectric film sensor. Specifically, the negative input terminal of thefirst operational amplifier U1 is connected to the upper electrode of the piezoelectric film sensor through thefirst resistor R1, and the positive input terminal of thefirst operational amplifier U1 is connected to the piezoelectric film sensor through the third resistorR3 . Negative electrode connection of the thin film sensor.
众所周知的是，所述电荷放大模块的输出电压UO1由反馈电容C1决定，而不是输入电容。具体的，It is well known that the output voltage UO1 of the charge amplification module is determined by the feedback capacitorC1 instead of the input capacitor. specific,
Q为电荷放大模块输入端的电荷。从而，电荷放大模块的输出电压U01与电缆电容等无关，从而可大大减小由传感器周围的寄生电容所造成的电荷泄露。Q is the charge at the input end of the charge amplification module. Therefore, the output voltage U01 of the charge amplification module has nothing to do with the cable capacitance, etc., so that the charge leakage caused by the parasitic capacitance around the sensor can be greatly reduced.
在本发明中，所述电荷放大模块所采用的第一运算放大器U1为OPA301放大芯片。具体的，该第一运算放大器U1具有高输入阻抗及低偏置电流，从而可避免了在反馈电容C1上电荷的泄露，也可防止反馈电容C1过度充放电。In the present invention, thefirst operational amplifier U1 used in the charge amplification module is an OPA301 amplification chip. Specifically, the first operational amplifier U1 hasa high input impedance and a low bias current, thereby avoiding charge leakage on the feedback capacitorC1 and preventing excessive charging and discharging of the feedback capacitorC1 .
进一步的，所述电荷放大模块还包括第二电阻R2，所述第二电阻R2并联在反馈电容C1的两端，从而可帮助反馈电容C1实现充电放大。并且该第二电阻R2的阻值较高，因而可提供较好的信噪比。在本具体实施方式中，所述第二电阻R2的阻值为100MΩ。Further, the charge amplification module further includes asecond resistor R2 , which is connected in parallel to both ends of the feedback capacitor C1 , so as to help the feedback capacitor C1 realize charge amplification. Moreover, thesecond resistor R2 has a higher resistance value, thus providing a better signal-to-noise ratio. In this specific implementation manner, the resistance of the second resistor R2 is 100MΩ.
如图2所示，所述电荷放大模块还包括第二电容C2和第四电阻R4，所述第二电容C2和第四电阻R4的一端与所述第一运算放大器U1的正输入端相连接，另一端则接半电源。因此，总体来说，所述第一运算放大器U1采用差分输入的形式，从而能够抑制共模干扰并且能完全吸收由压电薄膜传感器接触振动所产生的电荷信号，并转换成电压信号进行输出。需要说明的是，上述所述半电源是指输入电源的一半的值，具体的，在图2中，所述第一运算放大器U1接入电源VSS，则上述所述第二电容C2和第四电阻R4的另一端所接入的VEE的值即为VSS的一半，例如假设VSS的值为3V，则VEE的值即为1.5V。As shown in FIG. 2 , the charge amplification module further includes a second capacitor C2 and a fourth resistor R4 , one end of the second capacitor C2 and the fourth resistor R4 is connected to the first operational amplifier U1 The positive input terminal is connected, and the other terminal is connected to the half power supply. Therefore, in general, thefirst operational amplifier U1 adopts the form of differential input, so as to suppress common-mode interference and completely absorb the charge signal generated by the contact vibration of the piezoelectric film sensor, and convert it into a voltage signal for output . It should be noted that the aforementioned half power supply refers to the value of half of the input power supply. Specifically, in FIG. 2, the first operational amplifier U1 is connected to the power supply VSS, then the aforementionedsecond capacitor C2 and The value of VEE connected to the other end of the four resistors R4 is half of VSS. For example, assuming that the value of VSS is 3V, the value of VEE is 1.5V.
如上述所述，所述信号处理模块包括滤波模块及放大模块，具体的，所述滤波模块包括用以过滤低频电压信号的高通滤波模块及用于过滤高频电压信号的低通滤波模块。在本具体实施方式中，所述电荷放大模块输出的电压信号先经过高通滤波模块，再经过放大模块，再经过低通滤波模块。以下进行具体分析。As mentioned above, the signal processing module includes a filter module and an amplification module. Specifically, the filter module includes a high-pass filter module for filtering low-frequency voltage signals and a low-pass filter module for filtering high-frequency voltage signals. In this specific implementation manner, the voltage signal output by the charge amplification module first passes through the high-pass filter module, then passes through the amplification module, and then passes through the low-pass filter module. The following specific analysis.
所述高通滤波模块可过滤掉20Hz以下的、人耳无法听到的次声。具体的，如图2所示，所述高通滤波模块包括第二运算放大器U2、第三电容C3、第四电容C4、第五电阻R5及第六电阻R6。具体的，所述第二运算放大器U2的正输入端通过第六电阻R6接半电源，并同时通过第四电容C4、第三电容C3与第一运算放大器U1的输出端连接；所述第四电容C4与第三电容C3连接的一端通过第五电阻R5与第二运算放大器U2的输出端相连接；所述第二运算放大器U2的负输入端连接至第二运算放大器U2的输出端。The high-pass filter module can filter out infrasound below 20 Hz which cannot be heard by human ears. Specifically, as shown in FIG. 2 , the high-pass filter module includes a second operational amplifier U2 , a third capacitor C3 , a fourth capacitor C4 , a fifth resistor R5 and a sixth resistor R6 . Specifically, the positive input terminal of thesecond operational amplifier U2 is connected to the half power supply through thesixth resistor R6, and is connected to the output terminal of thefirst operational amplifier U1 through the fourth capacitorC4 and thethird capacitor C3 at the same time ; One end of the fourth capacitorC4 connected to thethird capacitor C3 is connected to the output terminal of thesecond operational amplifier U2 through thefifth resistor R5; the negative input terminal of thesecond operational amplifier U2 is connected to Output of thesecond operational amplifier U2.
通过上述设置，可将所述高通滤波模块的截至频率设置在20Hz。并且，由于所述心肺拾音装置需要有便携性，从而电池供电的电压较低，导致了电荷放大模块的放大不足、高频信号成分削峰等问题。但是，通过在电荷放大模块后连接上述所述的高通滤波模块，即可扩大动态范围，减少上述问题的发生。Through the above settings, the cut-off frequency of the high-pass filter module can be set at 20 Hz. Moreover, since the cardiopulmonary sound pickup device needs to be portable, the battery-powered voltage is relatively low, resulting in insufficient amplification of the charge amplification module, peak clipping of high-frequency signal components, and the like. However, by connecting the above-mentioned high-pass filter module after the charge amplification module, the dynamic range can be expanded and the occurrence of the above-mentioned problems can be reduced.
如图3所示，所述放大模块包括两个级联的第一运算放大电路及第二运算放大电路。通过两个级联的运算放大电路可改善单级运算放大所述产生的相位滞后。As shown in FIG. 3 , the amplifying module includes two cascaded first operational amplifier circuits and second operational amplifier circuits. The phase lag generated by the single-stage operational amplifier can be improved by two cascaded operational amplifier circuits.
具体的，所述第一运算放大电路包括第七电阻R7、第八电阻R8、第九电阻R9及第三运算放大器U3。所述第三运算放大器U3的正输入端接半电源，负输入端通过第七电阻R7与第二运算放大器U2的输出端相连接，并且，所述第八电阻R8和第九电阻R9相串联且连接于第三运算放大器U3的负输入端和输出端之间。因此，所述第三运算放大器U3的输出电压U02的值为：Specifically, the first operational amplifier circuit includes a seventh resistor R7 , an eighth resistor R8 , a ninth resistor R9 and a third operational amplifier U3 . The positive input terminal of thethird operational amplifier U3 is connected to the half power supply, the negative input terminal is connected to the output terminal of thesecond operational amplifier U2 through the seventh resistorR7 , and the eighth resistorR8 and the ninth The resistorR9 is connected in series between the negative input terminal and the output terminal of thethird operational amplifier U3. Therefore, the value of the output voltageU02 of thethird operational amplifier U3 is:
其中，Ui2为高通滤波电路的输出电压即第二运算放大器U2的输出电压。Wherein, Ui2 is the output voltage of the high-pass filter circuit, that is, the output voltage of the second operational amplifier U2 .
所述第二运算放大电路则包括第四运算放大器U4及单刀双掷开关S1。所述单刀双掷开关S1的输入端通过第十一电阻R11与第四运算放大器U4的负输入端相连接，所述单刀双掷开关S1的第一输出端通过第十二电阻R12与第四运算放大器U4的输出端连接，所述单刀双掷开关S1的第二输出端通过第十五电阻R15与第四运算放大器U4的输出端相连接，从而，所述单刀双掷开关S1可选择性的连通第十二电阻R12或第十五电阻R15，所述第十二电阻R12和第十五电阻R15的阻值不相同，从而改变第二运算放大电路的放大倍数。The second operational amplifier circuit includes a fourth operational amplifier U4 and a SPDT switch S1 . The input terminalof the SPDT switch S1 is connected to the negative input terminal of thefourth operational amplifier U4 through theeleventh resistor R11, and thefirst output terminal of the SPDT switch S1 is connected to the negative input terminal of the fourth operational amplifier U4 through the twelfth resistorR12 is connected to the output terminal of thefourth operational amplifier U4, and the second output terminalof the SPDT switch S1 is connected to the output terminal of thefourth operational amplifier U4 through the fifteenth resistorR15 , so that The SPDT switch S1 can be selectively connected to the twelfth resistor R12 or the fifteenth resistor R15 , and the resistance values of the twelfth resistor R12 and the fifteenth resistor R15 are different, thereby changing the 2. The magnification of the operational amplifier circuit.
另外，所述第四运算放大器U4正输入端接半电源，负输入端还通过第十电阻R10与第三运算放大器U3的输出端相连接。因此，当所述单刀双掷开关S1选择与第十二电阻R12连通时，所述第四运算放大器U4的输出电压U03为：In addition, the positive input terminal of thefourth operational amplifier U4 is connected to the half power supply, and the negative input terminal is also connected to the output terminal of thethird operational amplifier U3 through thetenth resistor R10. Therefore, when the SPDT switch S1 is connected to the twelfth resistorR12 , the output voltageU03of thefourth operational amplifier U4 is:
当所述单刀双掷开关S1选择与第十五电阻R15连通时，所述第四运算放大器U4的输出电压U03’为：When the SPDT switch S1 is connected to the fifteenth resistorR15 , the output voltageU03'of thefourth operational amplifier U4 is:
上述公式3及公式3’中，所述Ui3均为第一运算放大电路的输出端即第三运算放大器U3的输出端电压。因此，所述第二运算放大电路可通过单刀双掷开关S1改变导通的线路，从而可灵活实现不同心肺音的放大倍数。In the above formula 3 and formula 3', the Ui3 is the output terminal of the first operational amplifier circuit, that is, the voltage of the output terminal of thethird operational amplifier U3. Therefore, the second operational amplifier circuit can change the conducting line through the single-pole double-throw switch S1 , so as to flexibly realize different amplification factors of heart and lung sounds.
所述低通滤波模块可过滤掉2000Hz以上的频率，从而过滤掉除心肺音以外的高频干扰。具体的，所述低通滤波模块由两个二阶低通滤波电路级联而成。The low-pass filter module can filter out frequencies above 2000 Hz, thereby filtering out high-frequency interference except cardiopulmonary sounds. Specifically, the low-pass filter module is formed by cascading two second-order low-pass filter circuits.
从图4中可看出，所述低通滤波模块包括第一二阶低通滤波电路和第二二阶低通滤波电路。所述第一二阶低通滤波电路包括第五运算放大器U5。所述第五运算放大器U5的正输入端通过第十三电阻R13和第十四电阻R14与第四运算放大器U4的输出端相连接，且通过第九电容C9接地；所述第五运算放大器U5的负输入端连接至输出端；所述第十三电阻R13与第十四电阻R14连接的一端通过第七电容C7连接至第五运算放大器U5的输出端。It can be seen from FIG. 4 that the low-pass filter module includes a first second-order low-pass filter circuit and a second second-order low-pass filter circuit. The first second-order low-pass filter circuit includes a fifth operational amplifier U5 . The positive input terminal of thefifth operational amplifier U5 is connected to the output terminal of thefourth operational amplifier U4 through the thirteenth resistorR13 and the fourteenth resistorR14 , and is grounded through the ninth capacitorC9 ; The negative input terminal of thefifth operational amplifier U5 is connected to the output terminal; the end of the connection between the thirteenth resistorR13 and the fourteenth resistorR14 is connected to the output terminal of thefifth operational amplifier U5 through theseventh capacitor C7 .
相同的，所述第二二阶低通滤波电路包括第六运算放大器U6。所述第六运算放大器U6的正输入端通过第十七电阻R17、第十八电阻R18连接至所述第五运算放大器U5的输出端，并通过第十四电容C14接地；所述第六运算放大器U6的负输入端连接至输出端；所述第十七电阻R17与第十八电阻R18相连接的一端通过第十三电容C13连接至第六运算放大器U6的输出端。Similarly, the second second-order low-pass filter circuit includes a sixth operational amplifier U6 . The positive input terminal of thesixth operational amplifier U6 is connected to the output terminal of thefifth operational amplifier U5 through the seventeenth resistorR17 and the eighteenth resistorR18 , and grounded through the fourteenth capacitorC14 ; The negative input terminal of thesixth operational amplifier U6 is connected to the output terminal; the end of the seventeenth resistorR17 connected to the eighteenth resistorR18 is connected to the sixth operational amplifier U through the thirteenth capacitorC136 output terminals.
因此，通过第一二阶低通滤波电路和第二二阶低通滤波电路的配合，从而组成了四阶低通滤波。Therefore, through the cooperation of the first and second-order low-pass filter circuits and the second and second-order low-pass filter circuits, a fourth-order low-pass filter is formed.
所述心肺拾音装置还包括存储模块，并且与所述输出模块相配合以存储音频信号。从而，所述输出模块所输出的音频信号不仅可以实时播放，也可通过存储模块进行存储，从而可进行回放分析。The cardiopulmonary sound pickup device also includes a storage module, and cooperates with the output module to store audio signals. Therefore, the audio signal output by the output module can not only be played in real time, but can also be stored by the storage module, so that playback analysis can be performed.
具体的，所述输出模块包括用以将处理信号转化成音频信号的信号转化模块及音频播放模块，所述音频播放模块包括可移动终端和/或音频外放设备。Specifically, the output module includes a signal conversion module for converting the processed signal into an audio signal and an audio playback module, and the audio playback module includes a mobile terminal and/or an external audio playback device.
所述信号转化模块对处理信号进行ADC模数转换、数字信号处理、再经过DAC数模转化成音频信号以让音频播放模块进行实时的外放输出。进一步的，所述可移动终端和所述音频外放设备均可进行外放输出，在本具体实施方式中，所述外放设备为耳机，所述可移动终端为手机，所述输出模块输出的音频信号可通过蓝牙/无线网络等方式传递至手机中。The signal conversion module performs ADC analog-to-digital conversion and digital signal processing on the processed signal, and then digital-to-analog conversion by DAC into an audio signal so that the audio playback module can perform real-time external output. Further, both the portable terminal and the external audio playback device can perform external playback output. In this specific embodiment, the external playback device is an earphone, the mobile terminal is a mobile phone, and the output module outputs The audio signal can be transmitted to the mobile phone through bluetooth/wireless network and other methods.
因此，上述所述的存储模块也可直接设置于手机中，以对音频信号进行存储，从而手机即可通过蓝牙/无线网络等方式实现实时的信号传输及实时的音频播放，也可通过手机本身具有的存储功能对音频信号进行存储，从而可实现回放分析的功能。进一步的，手机还具有社交通信的功能，从而可将该心肺音音频信息发送至其他医生或医疗结构，以进行专家会诊、远程诊断等，为互联网医疗、远程医疗提供良好的基础。Therefore, the above-mentioned storage module can also be directly set in the mobile phone to store the audio signal, so that the mobile phone can realize real-time signal transmission and real-time audio playback through Bluetooth/wireless network, etc. It has a storage function to store the audio signal, so as to realize the function of playback analysis. Furthermore, the mobile phone also has the function of social communication, so that the heart and lung sound audio information can be sent to other doctors or medical institutions for expert consultation, remote diagnosis, etc., providing a good foundation for Internet medicine and telemedicine.
因此，综上所述，本发明的心肺拾音装置首先通过差分输入的电荷放大电路和压电薄膜相配合，以实现较高的信噪比；并且通过两个级联的第一运算放大电路和第二运算放大电路进行信号的放大，且能够防止相位滞后的问题，并且第二运算放大电路中采用单刀双掷开关S1，从而灵活的改变放大倍数，以得到最优的信号；最后，通过可移动终端和所述音频外放设备的使用，既可以实现实时播放和存储的功能，并且也可为互联网医疗、远程医疗提供良好的基础。Therefore, in summary, the cardiopulmonary sound pickup device of the present invention first cooperates with the piezoelectric film through the charge amplifier circuit of differential input, to realize higher signal-to-noise ratio; Amplify the signal with the second operational amplifier circuit, and can prevent the problem of phase lag, and the second operational amplifier circuit uses a single-pole double-throw switch S1 to flexibly change the amplification factor to obtain the optimal signal; finally, Through the use of the mobile terminal and the audio playback device, the functions of real-time playback and storage can be realized, and a good foundation can be provided for Internet medical treatment and telemedicine.
应当理解，虽然本说明书按照实施例加以描述，但并非每个实施例仅包含一个独立的技术方案，说明书的这种叙述方式仅仅是为清楚起见，本领域技术人员应当将说明书作为一个整体，各实施例中的技术方案也可以经适当组合，形成本领域技术人员可以理解的其他实施例。It should be understood that although the description is described according to the embodiments, not each embodiment only includes an independent technical solution, and this description of the description is only for clarity, and those skilled in the art should take the description as a whole, and each The technical solutions in the embodiments can also be properly combined to form other embodiments that can be understood by those skilled in the art.
上文所列出的一系列的详细说明仅仅是针对本发明的可行性实施例的具体说明，并非用以限制本发明的保护范围，凡未脱离本发明技艺精神所作的等效实施例或变更均应包含在本发明的保护范围之内。The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any equivalent embodiments or changes made without departing from the technical spirit of the present invention All should be included within the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811132433.7ACN108933977A (en) | 2018-09-27 | 2018-09-27 | Cardiopulmonary sound pick up equipment |
| PCT/CN2018/108312WO2020062020A1 (en) | 2018-09-27 | 2018-09-28 | Cardiopulmonary sound pickup device |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811132433.7ACN108933977A (en) | 2018-09-27 | 2018-09-27 | Cardiopulmonary sound pick up equipment |
| Publication Number | Publication Date |
|---|---|
| CN108933977Atrue CN108933977A (en) | 2018-12-04 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811132433.7APendingCN108933977A (en) | 2018-09-27 | 2018-09-27 | Cardiopulmonary sound pick up equipment |
| Country | Link |
|---|---|
| CN (1) | CN108933977A (en) |
| WO (1) | WO2020062020A1 (en) |
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