Strobe light source system capable of being used for mucous membrane wave examination

Abstract

The invention discloses a stroboscopic light source system capable of being used for mucous membrane wave inspection, and relates to the technical field of stroboscopic light sources, and the stroboscopic light source system comprises an ACDC isolation switch power supply, a main control unit, a microphone, an audio operational amplifier circuit 1, an audio operational amplifier circuit 2, an LED light source, an LED constant current power supply, a touch screen and a foot switch. Generation frequency and volume are calculated in real time, pulse light can be emitted at a set phase point synchronously with vocal cord vibration to enable a camera to shoot a fixed vibration position of a vocal cord in continuous vibration, and pulse light can be emitted synchronously with vocal cord vibration and automatically and continuously change the phase point for the camera to shoot all vibration periods of the vibrating vocal cord. And the mucous membrane wave of the examinee is shot.

Description

Technical Field

[0001] The present invention relates to the technical field of stroboscopic light sources, and more particularly to a stroboscopic light source system that can be used for mucosal wave inspection. Background Art

[0002] Dynamic laryngoscopy, also known as stroboscopic laryngoscopy, is mainly used to observe the vibration characteristics of the vocal cords during phonation. It is the only examination that can see the movement of the vocal cord mucosal waves. The changes in mucosal waves directly reflect the histological changes of the double vibrating body of the vocal cords and are a sensitive indicator of whether the vocal cords have pathological changes. It can observe the vibration law of the vocal cords and provide an objective basis for the diagnosis of vocal cord diseases (such as vocal cord cysts, early vocal cord cancer) and the comparison before and after vocal cord surgery. Therefore, dynamic laryngoscopy is of great significance in the fields of laryngology, voice medicine and art noise medicine. The principle is that when people utter words, the frequency is high and the vocal cords vibrate quickly. It is difficult to observe the true situation of vocal cord vibration with the naked eye. Therefore, in order to observe the true situation of vocal cord vibration in detail, it is necessary to use some method to slow down the rapid vibration of the vocal cords relatively. This method is the dynamic laryngoscopy inspection method. The inspection method of dynamic laryngoscopy is basically the same as that of the straight tube magnifying laryngoscope. The difference is that the light source is a pulsed flash light source, that is, the straight tube magnifying laryngoscope and the flash laryngoscope cold light source are connected through optical fibers. The camera system can record the actual vibration state of the vocal cords, and then through video playback, carefully observe the vibration of the vocal cords and the condition of laryngeal lesions. Due to the extremely rapid vibration of the vocal cords during phonation, the true closure state of the glottis cannot be determined with an ordinary laryngoscope, and can only be determined under a dynamic laryngoscope. The initial mucosal wave shooting was shot with ultra-high-speed camera equipment, with a speed of more than 1,000 frames. Ultra-high-speed movie photography can observe the vibration of the vocal cords in more detail, but due to factors such as high cost and inability to operate on some patients, it cannot be widely used in clinical practice.

[0003] To observe the vocal cord mucosal waves, it is necessary to design a device that can track the frequency of glottal sound production, synchronize the light flashing frequency with the glottal sound production frequency, and emit pulsed light at a specific phase in each vocal cord vibration cycle. When the light of the same frequency as the sound production is irradiated on the vocal cords and glottis muscles, the light reflected into the image sensor of the law object is relatively stable, and the camera system can also capture the vibrating vocal cords. With the widespread application of LED light sources in the field of endoscopy, the technology of using LED cold light sources to generate pulsed flash light sources and using endoscope cameras to capture vocal cord vibrations has been more researched and applied.

[0004] The "Medical Cold Light Source for Laryngoscopy" with the patent application number CN202311079881.6 discloses a stroboscopic light source that can monitor sound frequency and volume, and emit pulsed light according to the set phase at the frequency of tracking monitoring. When emitting pulsed light at the frequency and fixed phase of vocal cord vibration to irradiate the vibrating vocal cords, the pulsed light can only irradiate a certain state of the vocal cords. What the camera sees during shooting should be a static picture at a fixed position, and the complete waveform during vocal cord vibration cannot be seen, that is, the mucosal wave most needed for the diagnosis of vocal cord tissue cannot be seen.

[0005] Due to the special application structure requirements of the medical endoscope light source, the light emitted by the LED light source needs to be introduced into the light inlet of a glass fiber light guide beam with a diameter of less than 5 mm. It needs to go through multiple conversion interfaces before the light can irradiate the target area. The light loss in the entire transmission path is extremely large, and a particularly high light power density is required. The highest power consumption of a 3mm * 3mm light-emitting surface is close to 100W. In order to improve the heat dissipation efficiency, one of the conductive electrodes of the LED chip is used as the heat dissipation surface. For example, for Luminus' CBT-90W, it is driven by a DC voltage of 3 - 4V and can withstand a current of 20A. Under such low voltage and high current conditions, both the switching and conduction losses are very large, and the switching harmonic interference is also very serious. It is relatively complex to achieve true constant current drive. Since the technology of low-voltage constant-voltage high-current drive power supply is widely used, such as for high-power computer CPUs and the technology is relatively mature, the LED endoscope cold light source generally uses the method of controlling the voltage to achieve power control and brightness adjustment. The disadvantage of LED drive constant-voltage control is that the forward voltage Vf value of the LED chip is not consistent. Due to its diode current characteristics, it is necessary to match and adjust the power for each LED light source during production and debugging. In addition, since the Vf value of the LED chip will change with temperature and the elongation of service life, and due to the constant voltage, the output current will also change, which is not conducive to the service life of the LED light source.

[0006] The "Medical Cold Light Source for Laryngoscopy" with the patent application number CN202311079881.6 discloses a stroboscopic light source. The pulsed light generation circuit it discloses uses an adjustable light constant current source plus a switch switching circuit and a dummy load. Its technical route is to keep the drive power supply output at a constant power. During the off period of the LED light source, the dummy load is used to consume the output power of the drive power supply to keep the power output of the drive power supply stable. Suppose the duty cycle of the light pulse is 10%, and when the constant current source has a maximum output of 50W, the effective power of the light pulse is only 5W. The dummy load has to bear the remaining 45W of power. The dummy load, as an ineffective loss, increases the cost and heat loss, and also increases the space occupation. It is not an economical approach. In addition, the invention document does not disclose the specific implementation method of the constant current drive power supply. Summary of the Invention

[0007] In view of the deficiencies in the prior art, the present invention discloses "a stroboscopic light source technology for mucosal wave examination". By continuously collecting the pronunciation of the person being examined and calculating the occurrence frequency and volume in real time, it can not only emit pulsed light at the set phase point synchronously with the vocal cord vibration to make the camera capture the fixed vibration position of the vocal cords during continuous vibration, but also emit pulsed light synchronously with the vocal cord vibration and automatically and continuously change the phase point to be used for the camera to capture the entire vibration cycle of the vibrating vocal cords, and capture the "mucosal wave" of the person being examined.

[0008] To achieve the above object, the present invention provides the following technical solutions: A stroboscopic light source system for mucosal wave examination, comprising an AC-DC isolation switch power supply, a main control unit, a microphone, an audio operational amplifier circuit 1, an audio operational amplifier circuit 2, an LED light source, an LED constant current power supply, a main control unit, a touch screen, and a foot switch; The audio operational amplifier circuit 1 amplifies the weak electrical signal input by the microphone to a voltage range of 0 - 3.3V through two-stage operation and inputs the amplified electro-acoustic signal to the AD input port of the main control unit; The signal input end of the audio operational amplifier circuit 2 is connected to the signal output end of the audio operational amplifier circuit 1; The pedal switch is a foot-operated switch device composed of a left on-off switch, a right on-off switch, and a force pedal. The left on-off switch is used to cycle through different working modes: the right on-off switch and the force pedal have different functions in different modes; The LED light source and LED constant current power supply module includes input power filter capacitors C1 and C2, a constant current control chip U1, a current sampling resistor R1, an energy storage and freewheeling inductor L1, an LED light source LED1, a switching transistor Q1, a freewheeling diode Q2, an LED light source filter capacitor C5, a light source stroboscopic switch chip U2, an LED light source parallel shorting tube Q3, and an on-off switch transistor Q4; The main control unit continuously collects the input signals of the audio operational amplifier circuit 1 and the audio operational amplifier input circuit 2 through the AD plus DMA method and stores them in the data buffer. The AD sampling frequency is 100KHz for both, and two-channel AD audio signal recognition is performed synchronously. When the signal amplitude input by the audio operational amplifier circuit 1 is small, the main control unit performs signal recognition and calculation of the sound frequency and volume based on the signal output by the audio operational amplifier circuit 2. If the signal output by the audio operational amplifier circuit 1 can meet the calculation and recognition of the input audio frequency and volume of the main control unit, the main control unit performs signal recognition and calculation of the sound frequency and volume based on the signal output by the audio operational amplifier circuit 1.

[0009] Further, the audio operational amplifier circuit 2 first clamps the signal output by the audio operational amplifier circuit 1 to 0.7V through a circuit composed of a current-limiting resistor and a voltage-clamping diode, then amplifies it by about 5 times and clamps it to the voltage range of 0 - 3.3V through a 3V transient suppression diode, and outputs the amplified signal to the AD input port of the main control unit.

[0010] Further, the left on-off switch is used to cycle through four modes: mucosal wave, static light source, auto-synchronization, and frequency modulation; in the mucosal wave mode, the right on-off switch and the force pedal are ineffective, in the static light source mode, the right on-off switch is used to cycle through the quick gears for quickly switching the brightness of the LED light source, and the force pedal is used to set the brightness from 10% to 100% in 1% steps, in the auto-synchronization mode, the right on-off switch is used to cycle through the quick switching of the acoustic-optic pulse time points from 0° to 360° in 45° steps, and the force pedal is used to set the acoustic-optic pulse time points from 0° to 360° in 1° steps, in the frequency modulation mode, the right on-off switch is used to cycle through the quick switching of the acoustic-optic pulse time points from 0° to 360° in 45° steps, and the force pedal is used to set the light pulse frequency from 60Hz to 1000Hz in 1Hz steps.

[0011] Further, the LED constant current power supply is a buck constant current drive circuit with dimming function designed according to the characteristics of the LED light source, which converts the DC12V regulated DC power supply into a constant current output power supply of 2.5V - 4V required to drive the LED light source, and accepts the external input PWM duty cycle dimming signal to adjust the magnitude of the constant current output. The dimming range is 10% - 100% in the static light source mode; in addition, the LED constant current power supply also has an independent digital level input port to accept the external input level signal to control the on-off of the current passing through the LED light source, thereby realizing the stroboscopic pulse light function.

[0012] Further, the input power filter capacitors C1 and C2 filter the high-frequency and low-frequency fluctuations of the input DC12V power supply, making the voltage fluctuation smaller; The constant current control chip U1 has the functions of constant current detection control and built-in MOS drive, can realize the function of high-current LED constant current drive control, and has a PWM external dimming input interface; The current sampling resistor R1 has its two ends connected to the current sampling port of the constant current control chip U1; The energy storage and freewheeling inductor L1 suppresses the current passing through the LED light source LED1 and stores energy when the switching transistor is turned on. When the constant current control chip U1 detects that the current flowing through the current sampling resistor R1 exceeds the set maximum current, it controls the switching transistor Q1 to turn off and controls the freewheeling diode Q2 to turn on, providing a freewheeling circuit for the LED light source LED1; The LED light source LED1 is electrically connected to the output terminal of the LED constant current power supply; The switching transistor Q1 is a low - internal - resistance N - channel enhancement - mode MOS transistor. The constant - current control chip U1 controls its on - off state by controlling its gate level to achieve the on - off of the LED light source current; The free - wheeling diode Q2 is a low - internal - resistance P - channel enhancement - mode MOS transistor. The constant - current control chip U1 controls its on - off state by controlling its gate level to provide a free - wheeling path for the LED light source and the energy - storage free - wheeling inductor after the switching transistor Q1 is turned on and off; The LED light source filtering capacitor C5 is a low - ESR capacitor, which is connected in parallel with the LED light source LED1 through the on - off switching transistor Q4, making the voltage fluctuation across the LED light source LED1 smaller, so as to achieve a smaller LED light source current fluctuation effect; The light - source stroboscopic switch chip U2 has the driving ability of dual - channel in - phase and anti - phase high - current MOS transistors, which can realize one - way signal input and two - way anti - phase output, so as to control the synchronous on - off of the LED light source parallel short - circuit tube Q3 and the on - off switching transistor Q4, and make only one of the LED light source parallel short - circuit tube Q3 and the on - off switching transistor Q4 turn off at the same time. When the LED light source needs to stop emitting light, the LED light source parallel short - circuit tube Q3 is turned on and the on - off tube Q4 is turned off, and the electric charge stored in the LED light source filtering capacitor C5 is sealed in the capacitor and will not be discharged; when the LED light source needs to emit light, the LED light source parallel short - circuit tube Q3 is turned off and the on - off tube Q4 is turned on, and the LED light source filtering capacitor C5 is connected in parallel across the LED light source and immediately starts to supply current to the LED light source.

[0013] Furthermore, when the LED light source needs to work in the stroboscopic pulse light - source mode, an external input PWM pulse signal is sent to the stroboscopic pulse PWM signal input terminal of the light - source stroboscopic switch chip U2. When the input is at a high level, the light - source stroboscopic switch chip U2 drives the LED light source parallel short - circuit tube Q3 to turn off and the switching transistor Q4 to turn on; when the input is at a low level, the light - source stroboscopic switch chip U2 drives the LED light source parallel short - circuit tube Q3 to turn on and the switching transistor Q4 to turn off, thus realizing the rapid lighting and extinguishing of the LED light source.

[0014] Furthermore, the constant - current control chip U1 has a PWM brightness - adjustment input port. When the input port is at a high level, the constant - current control chip U1 switches the switching transistor Q1 and the free - wheeling diode Q2 at the frequency determined by the hardware circuit, continuously charging and discharging the free - wheeling inductor L1 and the LED light source filtering capacitor C5 to keep the LED light source emitting light at a constant current; the free - wheeling inductor L1 free - wheels and the LED light source filtering capacitor C5 discharges to keep the light source emitting light; when the input port is at a low level, the constant - current control chip U1 turns off the switching transistor Q1, and the LED light source LED1 relies on the energy - storage and the free - wheeling of the free - wheeling inductor L1 and the discharge of the LED light source filtering capacitor C5 to keep the light source emitting light; in order to keep the PWM brightness - adjustment input maintain a small LED light source current fluctuation, the PWM brightness - adjustment input should maintain a high frequency.

[0015] Further, the output signals of the audio operational amplifier circuit 1 and the audio operational amplifier input circuit 2 use 1.65V as the 0 potential of the sound waveform. The main control unit takes the time when the sound waveform changes upward and equals 1.65V as the 0° phase point of the sound waveform, the upward to the vertex as the 90° phase point, the downward to 1.65V as the 180° phase point, continues downward to the minimum value as the 270° phase point, and when the waveform continues to reverse to 1.65V as the 360° phase point. The main system of the main control unit processes immediately after the generation of the sound waveform AD data, continuously marks these special phase points, and uses them as the basis for frequency calculation and pulse light turn-on time points. At the same time, it saves the AD maximum value of each sound wave cycle. To ensure the accuracy of the displayed frequency and displayed volume, the main control unit uses 200 - 300mS as an average cycle of a sound frequency and volume and refreshes the display; after the main control unit recognizes a complete waveform cycle from 0° to 360°, it uses the AD number of this cycle as the pulse switch time phase point of the next waveform cycle, and sets the advance amount according to the set pulse light phase point to turn on the light source in advance.

[0016] Further, when the main control unit is set to the "mucosal wave" working mode, the main control unit automatically sets the pulse light time width and phase point of the current sound wave cycle according to the number of ADs in the previous waveform cycle and the pulse light turn-on light source time point, based on the principle of the pulse light occupying 10% of the entire cycle time width and evenly shifting the phase point backward.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The system of the present invention adopts a two-way audio input and AD acquisition design with different amplification factors, which is more conducive to accurately calculating the audio frequency and volume size in different sound frequency ranges, real-time tracking and calculating the patient's pronunciation audio, with a 1° adjustable stroboscopic phase, which can provide a stroboscopic light source for photographing the characteristics of different states of the glottis during phonation. The foot switch is used to switch the working mode and phase selection, liberating the operator's hands, avoiding simultaneous contact with sterile and non-sterile items, and facilitating the operator's use; 2. Due to the setting of the energy storage and current continuation inductor and the filter capacitor, a true LED constant current design scheme is realized. The driving current of the LED light source fluctuates less, maintaining LED constant current drive in any state, and keeping the drive circuit in a hot standby state during the stroboscopic pulse mode, without additional load power consumption loss, reducing the overall power consumption of the machine. The dimming constant current output and pulse stroboscopic are independently controlled, and it can be used both as a general high-brightness medical endoscope cold light source and for providing stroboscopy for photographing vocal cord mucosal waves. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a principle block diagram of a stroboscopic light source system that can be used for mucosal wave inspection; Figure 2 It is a schematic circuit diagram of the LED constant current power supply structure; Figure 3 It is the waveform diagram of the 90° phase pulse light; Figure 4 It is the waveform diagram of the 270° phase pulse light; Figure 5 It is the waveform diagram of the pulse light for mucosal wave imaging. Detailed implementation manners

[0019] Referring to Figures 1 - 5 , a stroboscopic light source system applicable to mucosal wave examination includes an AC-DC isolation switch power supply, a main control unit, a microphone, an audio operational amplifier circuit 1, an audio operational amplifier circuit 2, an LED light source, an LED constant current power supply, a main control unit, a touch screen, a foot switch, etc.

[0020] The AC-DC isolation switch power supply converts the input AC power supply into DC12V required for the system operation, and provides the working power supply for the main control unit, the touch screen, the LED constant current power supply, etc.; The main control unit is a functional circuit module with a 32-bit single-chip microcomputer as the core, and is built-in with embedded software. The 32-bit single-chip microcomputer has functions such as high-speed AD conversion input and DA conversion output, built-in timer, PWM output, serial data communication port, etc.; The microphone is an electret sound-electricity conversion device, which has the function of receiving sound waves in a wide range of 50Hz - 10KHz and converting them into weak electrical signals, and is used to receive the low and long sound emitted by the examinee and convert it into an electrical signal and output it to the signal input port of the audio operational amplifier circuit; Both the audio operational amplifier circuit 1 and the audio operational amplifier circuit 2 are operational amplifier circuits with LM386 as the core. The audio operational amplifier circuit 1 amplifies the weak electrical signal input by the microphone to a voltage range of 0 - 3.3V through two-stage operation, and inputs the amplified sound-electricity signal to the AD input port of the main control unit; the signal input end of the audio operational amplifier circuit 2 is connected to the signal output end of the audio operational amplifier circuit 1. The audio operational amplifier circuit 2 first clamps the signal output by the audio operational amplifier circuit 1 to 0.7V through a circuit composed of a current-limiting resistor and a voltage clamping diode, then amplifies it by about 5 times and clamps it to a voltage range of 0 - 3.3V through a 3V transient suppression diode, and outputs the amplified signal to the AD input port of the main control unit; due to the sound receiving frequency frequency characteristics of the microphone, the electrical signal amplitude of its 50Hz - 100Hz sound signal is very small, and the amplitude amplified by the audio operational amplifier circuit 1 is difficult to meet the calculation and recognition requirements of the sound frequency and volume of the main control unit. The lower-frequency audio signal needs to be amplified by the audio operational amplifier circuit 2 before being transmitted to the main control unit as the basis for identifying the audio frequency and volume; The touch screen is an LCD module with capacitive touch and dot matrix display functions. It is connected to the main control module through the UART serial port and acts as a slave to receive the control of the main control unit. It uploads touch operation information to the main control unit through a private protocol and receives the display content switching instruction of the main control unit; the displayed indication content includes working mode, sound frequency, volume, light source brightness, etc.; the touch setting functions include mode switching, light source brightness setting, light pulse phase setting, light pulse frequency, etc. The pedal switch is a foot-operated switch device composed of two on-off switches on the left and right and a force pedal. The two on-off switch ports are connected to the digital input ports of the main control unit. The force pedal converts the force of stepping on the pedal into an electrical level signal and outputs it to the AD conversion input port of the main control. The left on-off switch is used to cycle through the working modes: mucosal wave, static light source, auto-same frequency, and frequency modulation modes; the right on-off switch and the force pedal have different functions in different modes. In the mucosal wave mode, the right on-off switch and the force pedal are invalid. In the static light source mode, the right on-off switch is used to cycle through the quick gears for switching the LED light source brightness quickly (10% per gear), and the force pedal is used to set the brightness from 10% to 100% in 1% steps (hold for two seconds after stepping on the appropriate brightness and then quickly release to memorize the set brightness). In the auto-same frequency mode, the right on-off switch is used to cycle through the quick switching of the 0° - 360° acoustic wave light pulse time points in 45° steps, and the force pedal is used to set the 0° - 360° acoustic wave light pulse time points in 1° steps. In the frequency modulation mode, the right on-off switch is used to cycle through the quick switching of the 0° - 360° acoustic wave light pulse time points in 45° steps, and the force pedal is used to set the light pulse frequency from 60Hz to 1000Hz in 1Hz steps (hold for two seconds after stepping on the appropriate frequency and then quickly release to memorize the set frequency). The LED constant current power supply is a buck constant current drive circuit with dimming function designed according to the characteristics of the LED light source. It converts the DC12V regulated DC power supply into a 2.5V - 4V constant current output power supply required to drive the LED light source, and accepts the external input PWM duty cycle dimming signal to adjust the magnitude of the constant current output. In the static light source mode, the dimming range is 10% - 100%; in addition, the LED constant current power supply also has an independent digital level input port to accept the external input level signal to control the on-off of the current passing through the LED light source, so as to realize the stroboscopic pulse light function. The LED light source and constant current power supply module includes input power filter capacitors C1 and C2, constant current control chip U1, current sampling resistor R1, energy storage and freewheeling inductor L1, LED light source LED1, switching transistor Q1, freewheeling diode Q2, LED light source filter capacitor C5, light source stroboscopic switch chip U2, LED light source parallel shorting tube Q3, on-off switch tube Q4, etc. The input power filter capacitors C1 and C2 perform high-frequency and low-frequency fluctuation filtering on the input DC12V power supply to make the voltage fluctuation smaller. The constant current control chip U1 is the step-down constant current drive chip PC1226 produced by Shenzhen Jixin Microelectronics Technology Co., Ltd. It has the functions of constant current detection control and built-in MOS drive, can realize the constant current drive control function of high-current LEDs, and has a PWM external dimming input interface; The current sampling resistor R1 is a milliohm-level high-precision resistor, and its two ends are connected to the current sampling port of the constant current control chip U1; The energy storage and freewheeling inductor L1 suppresses the current passing through the LED light source LED1 and stores energy when the switch tube is conducting. When the constant current control chip U1 detects that the current flowing through the current sampling resistor R1 exceeds the set maximum current, it controls the switch tube Q1 to turn off and controls the freewheeling tube Q2 to turn on, providing a freewheeling path for the LED light source LED1; The LED light source LED1 is an LED light source module with a color temperature of 3000K - 6500K, a color rendering index greater than 90 CRI, and a high power density. It is electrically connected to the output terminal of the LED constant current power supply, and the preferred model is CBT-140-W; The switch tube Q1 is a low-resistance N-channel enhancement-mode MOS tube. The constant current control chip U1 controls its on / off by controlling its gate level to achieve the on / off of the LED light source current; The freewheeling tube Q2 is a low-resistance P-channel enhancement-mode MOS tube. The constant current control chip U1 controls its on / off by controlling its gate level to provide a freewheeling path for the LED light source and the energy storage freewheeling inductor after the switch tube Q1 turns on and off; current on / off; The LED light source filter capacitor C5 is a low-ESR capacitor, which is connected in parallel with the LED light source LED1 through the on / off switch tube Q4, making the voltage fluctuation at both ends of the LED light source LED1 smaller, so as to achieve a smaller LED light source current fluctuation effect; The light source stroboscopic switch chip U2 is UCC27526 produced by Texas Instruments. It has the driving ability of dual-channel in-phase and anti-phase high-current MOS tubes, and can realize one-way signal input and two-way anti-phase output, so as to control the synchronous on / off of the LED light source parallel shorting tube Q3 and the on / off switch tube Q4, and make only one of the LED light source parallel shorting tube Q3 and the on / off switch tube Q4 turn off at the same time. When the LED light source needs to stop emitting light, the LED light source parallel shorting tube Q3 turns on and the on / off tube Q4 turns off, and the electric energy stored in the LED light source filter capacitor C5 is sealed in the capacitor and will not be discharged; when the LED light source needs to emit light, the LED light source parallel shorting tube Q3 turns off and the on / off tube Q4 turns on, and the LED light source filter capacitor C5 is connected in parallel at both ends of the LED light source and immediately starts to provide current to the LED light source; When it is necessary for the LED light source to work in the stroboscopic pulse light source mode, an external input PWM pulse signal is sent to the stroboscopic pulse PWM signal input terminal of the light source stroboscopic switch chip U2. When the input is at a high level, the light source stroboscopic switch chip U2 drives the parallel short - circuit tube Q3 of the LED light source to turn off and the switch tube Q4 to turn on. When the input is at a low level, the light source stroboscopic switch chip U2 drives the parallel short - circuit tube Q3 of the LED light source to turn on and the switch tube Q4 to turn off, thereby realizing the rapid lighting and extinguishing of the LED light source. In this way, it can not only ensure a large - current constant - current output when the LED is lit, but also quickly extinguish, achieving the effect of stroboscopic pulse light; The constant - current control chip U1 has a PWM brightness - adjustment input port. When the input port is at a high level, the constant - current control chip U1 switches the switch tube Q1 and the free - wheeling diode Q2 at a frequency determined by the hardware circuit, continuously charging and discharging the free - wheeling inductor L1 and the LED light - source filter capacitor C5 to keep the LED light source emitting light at a constant current; the free - wheeling inductor L1 provides free - wheeling current and the LED light - source filter capacitor C5 discharges to keep the light source emitting light. When the input port is at a low level, the constant - current control chip U1 turns off the switch tube Q1, and the LED light source LED1 relies on energy storage, the free - wheeling of the free - wheeling inductor L1 and the discharge of the LED light - source filter capacitor C5 to keep the light source emitting light; in order to keep the LED light - source current fluctuation of the PWM brightness - adjustment input small, the PWM brightness - adjustment input should maintain a relatively high frequency, such as above 10KHz; The main control unit continuously collects the input signals of the audio operational - amplifier circuit 1 and the audio operational - amplifier input circuit 2 through the AD plus DMA method and stores them in the data buffer. The AD sampling frequency of both is 100KHz (each AD data cycle is equal to 10uS, and it is used as the time reference for frequency calculation), and two - channel AD audio - signal recognition is carried out synchronously. When the amplitude of the signal input to the audio operational - amplifier circuit 1 is small, the main control unit uses the signal output by the audio operational - amplifier circuit 2 as the basis to perform signal recognition and calculation of the sound frequency and volume. If the signal output by the audio operational - amplifier circuit 1 can meet the calculation and recognition of the input audio frequency and volume of the main control unit, the main control unit uses the signal output by the audio operational - amplifier circuit 1 as the basis to perform signal recognition and calculation of the sound frequency and volume; Frequency and volume recognition calculation: The output signals of the audio operational amplifier circuit 1 and the audio operational amplifier input circuit 2 use 1.65V as the 0 potential of the sound waveform. The main control unit takes the moment when the sound waveform changes upward and equals 1.65V as the 0° phase point of the sound waveform, the upward to the vertex as the 90° phase point, the downward to 1.65V as the 180° phase point, continuing downward to the minimum value as the 270° phase point, and when the waveform continues to reverse to 1.65V as the 360° phase point (which is also the 0° phase point). The main system of the main control unit processes immediately after the generation of the AD data of the sound waveform, continuously marks these special phase points, and uses them as the basis for frequency calculation and the pulse light turn-on time point. At the same time, it saves the AD maximum value of each sound wave cycle (as the basis for volume calculation). To ensure the accuracy of the displayed frequency and displayed volume, the main control unit uses 200 - 300mS as an average cycle of a sound frequency and volume and refreshes the display; after the main control unit recognizes a complete waveform cycle from 0° to 360°, it uses the AD data of this cycle as the pulse switch time phase point of the next waveform cycle, and sets the light source to turn on in advance according to the set advance amount of the pulse light phase point. For example, if the previous waveform cycle occupies 200 AD data, the light pulse is set at the 90° phase, and each light pulse occupies 10% of the sound wave cycle. The main control unit turns on the light pulse after the 40th AD data sampling input of the current sound wave cycle is completed, and turns off the light pulse after the 60th AD sampling data input is completed, as Figure 3 shown; Similarly, when the pulse light is set at the 270° phase, the main control unit turns on the pulse light after 140 AD data conversions are completed and turns off the pulse light after the 160th AD data conversion is completed, as Figure 4 shown; When the main control unit is set to the "mucosal wave" working mode, the main control unit automatically sets the pulse light time width and phase point of the current sound wave cycle according to the number of ADs in the previous waveform cycle and the pulse light turn-on time point of the light source, following the principle of the pulse light occupying 10% of the entire cycle in time width and evenly shifting the phase point backward: For example, if the previous sound waveform cycle has 1000 AD conversion data, the pulse light turn-on time point is the end of the 100th AD data conversion, the current mode frequency is 1Hz for one mucosal wave cycle (that is, one complete vocal cord vibration cycle is captured in 1S), there are about 100 waveforms in 1 second, the turn-on time point of the frequency flash for each waveform is shifted backward by 10 AD data, and the turn-on time point of the frequency flash for the current waveform is the completion of the 110th AD data conversion, as Figure 5 shown. Using the principle of the 0.1S visual persistence of the human eye, after 100 waveforms, a complete vocal cord vibration cycle can be captured, that is, a complete mucosal wave cycle.

[0021] The above formulas are all dimensionless and only take their numerical values for calculation. The formulas are obtained by collecting a large amount of data for software simulation to get a formula closest to the actual situation. The preset parameters in the formulas are set by those skilled in the art according to the actual situation.

[0022] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from a website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless (such as infrared, wireless, microwave, etc.) manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that contains a collection of one or more available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state drive.

[0023] It should be understood that in various embodiments of the present application, the magnitudes of the serial numbers of the above processes do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0024] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. A professional technician can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0025] Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0026] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of the devices or units can be in electrical, mechanical, or other forms.

[0027] If the above functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs, and other various media that can store program codes.

[0028] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A stroboscopic light source system that can be used for mucosal wave examination, characterized in that, It includes an AC-DC isolation switch power supply, a main control unit, a microphone, an audio operational amplifier circuit 1, an audio operational amplifier circuit 2, an LED light source, an LED constant current power supply, a main control unit, a touch screen, and a foot switch; The audio operational amplifier circuit 1 amplifies the weak electrical signal input by the microphone to a voltage range of 0 - 3.3V through two-stage operation and inputs the amplified electro-acoustic signal to the AD input port of the main control unit; The signal input end of the audio operational amplifier circuit 2 is connected to the signal output end of the audio operational amplifier circuit 1; The pedal switch is a foot-operated switch device composed of a left on-off switch, a right on-off switch, and a force pedal. The left on-off switch is used to cycle through working modes: the right on-off switch and the force pedal have different functions in different modes; The LED light source and LED constant current power supply module includes input power filter capacitors C1 and C2, a constant current control chip U1, a current sampling resistor R1, a storage and freewheeling inductor L1, an LED light source LED1, a switching transistor Q1, a freewheeling diode Q2, an LED light source filter capacitor C5, a light source stroboscopic switch chip U2, an LED light source parallel shorting tube Q3, and an on-off switching transistor Q4; The main control unit continuously collects the input signals of the audio operational amplifier circuit 1 and the audio operational amplifier input circuit 2 through the AD plus DMA method and stores them in the data buffer. The AD sampling frequency is 100KHz for both, and two-channel AD audio signal recognition is performed synchronously. When the signal amplitude input by the audio operational amplifier circuit 1 is small, the main control unit uses the signal output by the audio operational amplifier circuit 2 as the standard to perform signal recognition and calculation of sound frequency and volume. If the signal output by the audio operational amplifier circuit 1 can meet the calculation and recognition of the input audio frequency and volume of the main control unit, the main control unit uses the signal output by the audio operational amplifier circuit 1 as the standard to perform signal recognition and calculation of sound frequency and volume.

2. The stroboscopic light source system for mucosal wave examination according to claim 1, wherein, The audio operational amplifier circuit 2 first clamps the signal output by the audio operational amplifier circuit 1 to 0.7V through a circuit composed of a current limiting resistor and a voltage clamping diode, then amplifies it by about 5 times and clamps it to the 0 - 3.3V voltage range through a 3V transient suppression diode, and outputs the amplified signal to the AD input port of the main control unit.

3. The stroboscopic light source system for mucosal wave examination according to claim 1, wherein, The left on-off switch is used to cycle through four modes: mucosal wave, static light source, auto-sync, and frequency modulation; in the mucosal wave mode, the right on-off switch and the force pedal are invalid. In the static light source mode, the right on-off switch is used to cycle through the quick gears for quickly switching the LED light source brightness, and the force pedal is used to set the brightness from 10% to 100% in 1% steps. In the auto-sync mode, the right on-off switch is used to cycle through the quick switching of the 0° - 360° acoustic wave light pulse time point in 45° steps, and the force pedal is used to set the 0° - 360° acoustic wave light pulse time point in 1° steps. In the frequency modulation mode, the right on-off switch is used to cycle through the quick switching of the 0° - 360° acoustic wave light pulse time point in 45° steps, and the force pedal is used to set the light pulse frequency from 60Hz to 1000Hz in 1Hz steps.

4. A stroboscopic light source system for mucosal wave examination according to claim 1, characterized in that, The LED constant current power supply is a buck constant current drive circuit with dimming function designed according to the characteristics of LED light sources. It converts the DC12V regulated DC power supply into a 2.5V - 4V constant current output power supply required to drive the LED light source, and accepts an external input PWM duty cycle dimming signal to adjust the magnitude of the constant current output. The dimming range is 10% - 100% in the static light source mode. Additionally, the LED constant current power supply has an independent digital level input port to accept an external input level signal to control the on / off of the current passing through the LED light source, thereby realizing the stroboscopic pulse light function.

5. The stroboscopic light source system for mucosal wave examination according to claim 1, characterized in that, The input power filter capacitors C1 and C2 perform high - and low - frequency fluctuation filtering on the input DC12V power supply, making the voltage fluctuation smaller. The constant current control chip U1 has the functions of constant current detection control and built - in MOS drive, can realize the constant current drive control function for high - current LEDs, and has a PWM external dimming input interface. The current sampling resistor R1 has its two ends connected to the current sampling port of the constant current control chip U1. The energy storage and flyback inductor L1 suppresses the current passing through the LED light source LED1 and stores energy when the switching transistor is conducting. When the constant current control chip U1 detects that the current flowing through the current sampling resistor R1 exceeds the set maximum current, it controls the switching transistor Q1 to turn off and controls the flyback transistor Q2 to turn on, providing a flyback loop for the LED light source LED1. The LED light source LED1 is electrically connected to the output terminal of the LED constant current power supply. The switching transistor Q1 is a low - internal - resistance N - channel enhancement - mode MOS transistor. The constant current control chip U1 controls its on / off by controlling its gate level to achieve the on / off of the LED light source current. The flyback transistor Q2 is a low - internal - resistance P - channel enhancement - mode MOS transistor. The constant current control chip U1 controls its on / off by controlling its gate level to provide a flyback loop for the LED light source and the energy storage and flyback inductor after the switching transistor Q1 turns on and off; current on / off. The LED light source filter capacitor C5 is a low - ESR capacitor, which is connected in parallel with the LED light source LED1 through the on / off switching transistor Q4, making the voltage fluctuation at both ends of the LED light source LED1 smaller, so as to achieve a smaller LED light source current fluctuation effect. The light source stroboscopic switch chip U2 has the driving ability of dual - channel in - phase and anti - phase high - current MOS transistors, and can realize one - way signal input and two - way anti - phase output, thereby controlling the synchronous on / off of the LED light source parallel short - circuit tube Q3 and the on / off switching transistor Q4, and making only one of the LED light source parallel short - circuit tube Q3 and the on / off switching transistor Q4 turn off at the same time. When the LED light source needs to stop emitting light, the LED light source parallel short - circuit tube Q3 turns on and the on / off tube Q4 turns off, and the electric charge stored in the LED light source filter capacitor C5 is sealed in the capacitor and will not be discharged; when the LED light source needs to emit light, the LED light source parallel short - circuit tube Q3 turns off and the on / off tube Q4 turns on, and the LED light source filter capacitor C5 is connected in parallel across the LED light source and immediately starts to supply current to the LED light source.

6. The stroboscopic light source system applicable to mucosal wave examination according to claim 1, characterized in that, When the LED light source needs to work in the stroboscopic pulse light source mode, an external input PWM pulse signal is sent to the stroboscopic pulse PWM signal input terminal of the light source stroboscopic switch chip U2. When the level is high, the light source stroboscopic switch chip U2 drives the parallel short-circuit tube Q3 of the LED light source to turn off and the switch tube Q4 to conduct. When the level is low, the light source stroboscopic switch chip U2 drives the parallel short-circuit tube Q3 of the LED light source to conduct and the switch tube Q4 to turn off, thereby realizing the rapid lighting and extinguishing of the LED light source.

7. A stroboscopic light source system that can be used for mucosal wave examination according to claim 1, characterized in that, The constant current control chip U1 has a PWM brightness adjustment input port. When the input port is at a high level, the constant current control chip U1 switches the switch tube Q1 and the freewheeling diode Q2 at a frequency determined by the hardware circuit, continuously charging and discharging the freewheeling inductor L1 and the LED light source filter capacitor C5 to keep the LED light source emitting light at a constant current; the freewheeling inductor L1 freewheels and the LED light source filter capacitor C5 discharges to keep the light source emitting light; when the input port is at a low level, the constant current control chip U1 turns off the switch tube Q1, and the LED light source LED1 relies on energy storage, the freewheeling of the freewheeling inductor L1 and the discharge of the LED light source filter capacitor C5 to keep the light source emitting light; in order to keep the LED light source current fluctuation of the PWM brightness adjustment input small, the PWM brightness adjustment input should maintain a high frequency.

8. A stroboscopic light source system applicable to mucosal wave examination according to claim 1, characterized in that, The output signals of the audio operational amplifier circuit 1 and the audio operational amplifier input circuit 2 use 1.65V as the 0 potential of the sound waveform. The main control unit takes the time when the sound waveform changes upward and equals 1.65V as the 0° phase point of the sound waveform, the upward to the vertex as the 90° phase point, the downward to 1.65V as the 180° phase point, continuing downward to the minimum value as the 270° phase point, and the waveform continuing to reverse to 1.65V as the 360° phase point. The main control unit main system processes immediately after the AD data of the sound waveform is generated, continuously marks these special phase points, and uses them as the basis for frequency calculation and the pulse light turn-on time point. At the same time, it saves the AD maximum value of each sound wave cycle. In order to ensure the accuracy of the displayed frequency and the displayed volume, the main control unit uses 200 - 300mS as an average cycle of a sound frequency and volume and refreshes the display; After the main control unit identifies a complete waveform cycle from 0° to 360°, it uses the AD number of this cycle as the pulse switch time phase point of the next waveform cycle, and turns on the light source in advance according to the set advance amount of the pulse light phase point.

9. A stroboscopic light source system that can be used for mucosal wave examination according to claim 1, characterized in that, When the main control unit is set to the "mucosal wave" working mode, the main control unit automatically sets the pulse light time width and phase point of the current sound wave cycle according to the AD number of the previous waveform cycle and the pulse light turn-on time point of the light source, following the principle of the pulse light accounting for 10% of the entire cycle in time width and evenly shifting the phase point backward.

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