CN118330755B - A signal triggering method and voice prompting system based on electromagnetic wave signal - Google Patents
A signal triggering method and voice prompting system based on electromagnetic wave signal Download PDFInfo
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Abstract
The application relates to the technical field of electromagnetic signal detection application, and discloses a signal triggering method and a voice prompt system based on electromagnetic signals, wherein the method comprises the steps of receiving the electromagnetic signals in a preset geographic range; noise reduction is carried out on the received electromagnetic wave signals; analyzing the electromagnetic wave after noise reduction; intercepting the electromagnetic wave signal of the first set frequency band after analysis; if the matching degree of the first set frequency band and the preset frequency band is greater than or equal to a preset value, outputting a trigger signal; if the matching degree of the first set frequency band and the preset frequency band is lower than the preset value, calculating the energy corresponding to the electromagnetic wave signal in the first set frequency band, and calculating the accumulated energy corresponding to the electromagnetic wave signal in the first set frequency band in the first set time period; and outputting a trigger signal when the accumulated energy is greater than or equal to an energy threshold. The application realizes more triggering modes by utilizing electromagnetic waves, is beneficial to quick triggering under emergency conditions and is convenient to quickly find out equipment.
Description
Technical Field
The application relates to the technical field of electromagnetic signal detection application, in particular to a signal triggering method and a voice prompt system based on electromagnetic wave signals.
Background
People often face the situation of finding something important in an urgent way in a short time in work and life, and various losses are often caused by overlong finding time. Such as in the medical field, the location of the defibrillator is sought during emergency treatment. For another example, in the fire-fighting field, when a fire occurs, it is important to find the location of the fire extinguisher, and if the location of the fire extinguisher can be known quickly, the fire extinguisher can be found in a time saving manner, thereby being beneficial to reducing the loss. Also for example in the aeronautics field, the search for oxygen masks, the search for life jackets, etc.
In the related art, the electromagnetic wave signal is mostly processed by a specific receiving device, and the electromagnetic wave in a certain frequency band is received and triggers a series of operations, and the receiving device can only respond to the electromagnetic wave in the frequency band and cannot be triggered by other electromagnetic wave signals; for example, a remote control can only control the start of a device. Although the scheme has certain advantages, the electromagnetic wave can be prevented from being triggered by other electromagnetic waves, and the electromagnetic wave protection device has certain protection and safety.
For example, in the related art, publication (bulletin) No. JP6318276B2, an information processing apparatus and an information processing method, an apparatus determination unit that determines the type of an apparatus from a power spectrum of electromagnetic waves; an operation determination unit determines an operation of the device based on a power spectrum of the electromagnetic wave.
However, in some emergency situations, this method has certain drawbacks, if it is required to match and find the corresponding devices one by one, which consumes time, and it is impossible to quickly find the devices or apparatuses, or to quickly realize the starting of a certain device, etc. If an emergency situation exists, the electromagnetic wave matching mode is used, so that the time for searching or starting equipment or device is easily delayed, and potential safety hazards exist.
Disclosure of Invention
In order to realize more triggering modes by utilizing electromagnetic waves, the application provides a signal triggering method and a voice prompt system based on electromagnetic wave signals.
The application provides a signal triggering method based on electromagnetic wave signals, which adopts the following technical scheme:
A signal triggering method based on electromagnetic wave signals comprises the following steps: receiving electromagnetic wave signals in a preset geographic range;
Noise reduction is carried out on the received electromagnetic wave signals;
analyzing the electromagnetic wave after noise reduction;
intercepting the electromagnetic wave signal of the first set frequency band after analysis,
Outputting a trigger signal if the matching degree of the frequency band of the electromagnetic wave signal in the first set frequency band and the preset frequency band is greater than or equal to a preset value;
if the matching degree between the frequency band of the electromagnetic wave signal in the first set frequency band and the preset frequency band is lower than the preset value,
Calculating the energy corresponding to the electromagnetic wave signal in the first set frequency band, and calculating the accumulated energy corresponding to the electromagnetic wave signal in the first set frequency band in a first set time period; when the accumulated energy is greater than or equal to an energy threshold, outputting a trigger signal;
And/or acquiring the electromagnetic wave amplitude of the electromagnetic wave signal in the first set frequency band within a second set time period; calculating the attenuation speed of the electromagnetic wave amplitude; and outputting a trigger signal if the electromagnetic wave amplitude is higher than an amplitude threshold value and the electromagnetic wave amplitude attenuation speed is smaller than an attenuation threshold value.
By adopting the technical scheme, the original triggering mode of frequency band matching is reserved, the energy judging mode is further added, and whether triggering is needed or not is judged by accumulating the energy; for example, although the remote controller is not matched with the device, under the condition that electromagnetic wave signals are continuously sent out in a set range, accumulated energy is larger, a trigger signal can be sent out, so that the triggering mode of the electromagnetic wave signals is expanded, and the remote controller is favorable for quick triggering, such as convenient and quick equipment finding operation and the like, especially in emergency. The determination may be made by the attenuation speed of the electromagnetic wave amplitude, or a combination of both, in addition to the determination by the magnitude of the accumulated energy. If the received electromagnetic wave decays slowly within a certain geographical range, it means that there is always an electromagnetic wave received, so that according to this state, triggering according to the received electromagnetic wave signal is achieved.
Optionally, the method further comprises:
performing frequency domain analysis on the electromagnetic wave signals in the first set frequency band;
obtaining frequency domain information of the electromagnetic wave signal;
calculating the power spectrum density corresponding to the frequency domain information;
Adjusting the magnitude of the energy threshold according to the power spectral density, wherein the energy threshold is larger if the power spectral density is larger; the smaller the power spectral density, the smaller the energy threshold.
By adopting the technical scheme, through frequency domain analysis, if the power spectrum density of the electromagnetic wave signal is large, the electromagnetic wave signal can be greatly attenuated and interfered in the transmission process, and the receiving end can not correctly receive the signal; therefore, in order to reduce the interference of noise, the larger the interference is, the larger the energy threshold is, thereby being beneficial to ensuring the accuracy of the result.
Optionally, the method further comprises:
performing frequency domain analysis on the electromagnetic wave signals in the first set frequency band;
obtaining frequency domain information of the electromagnetic wave signal;
calculating the power spectrum density corresponding to the frequency domain information;
Adjusting the area of the preset geographical range according to the power spectral density, wherein the larger the power spectral density is, the smaller the area of the preset geographical range is; the smaller the power spectral density, the larger the area of the preset geographical range.
By adopting the technical scheme, through frequency domain analysis, if the power spectrum density of the electromagnetic wave signal is large, the electromagnetic wave signal can be greatly attenuated and interfered in the transmission process, and the receiving end can not correctly receive the signal; therefore, in order to reduce the interference of noise, when the interference is larger, the preset geographical range is smaller, so that the accuracy of the result is guaranteed.
Optionally, if the matching degree between the frequency band of the electromagnetic wave signal in the first set frequency band and the preset frequency band is lower than the preset value, the method may be replaced by:
intercepting the electromagnetic wave signals in a second set frequency band in a third set time period; wherein the range of the second set frequency band is larger than the range of the first set frequency band;
performing spectrum analysis on the intercepted electromagnetic wave signals in the second set frequency band;
analyzing N different electromagnetic wave signals, and calculating correlation coefficients between any two electromagnetic wave signals;
The number of the electromagnetic wave signals with the accumulated correlation coefficient larger than 0 is n;
Calculating a correlation value of the electromagnetic wave signal in the second set frequency band; the correlation value = N/N;
and if the correlation value is greater than the correlation threshold value, outputting a trigger signal.
By adopting the technical scheme, as a plurality of devices of the same type are adopted, the frequency bands of the matched electromagnetic waves are mostly similar or similar, namely, the received electromagnetic wave signals are similar, if the electromagnetic wave signals are similar electromagnetic wave signals, when the electromagnetic wave signals are in a second set frequency band and the correlation value is larger, triggering can be started; that is, the devices of the same type and different frequency bands can be realized by one remote controller under a certain precondition, and the matching and the corresponding are not needed one by one.
Optionally, the method further comprises:
calculating the acceleration of the accumulated energy in a fourth set time period according to the accumulated energy, and adjusting the tone of the voice prompt when the acceleration exceeds an acceleration threshold;
and the larger the accumulated energy, the larger the pitch; the smaller the accumulated energy, the smaller the pitch.
By adopting the technical scheme, the change of the tone reflects the change of the sound frequency, and if the accumulated energy is larger, the larger the energy of the received electromagnetic wave is, the closer the receiving distance of the electromagnetic wave is, and the quick finding of equipment is facilitated by the change of the tone.
Optionally, if the matching degree between the frequency band of the electromagnetic wave signal in the first set frequency band and the preset frequency band is lower than the preset value, the method may be replaced by:
sampling the voltage signal at the receiving position of the electromagnetic wave signal according to a set frequency in a fifth set time period;
Calculating the voltage change speed of the voltage value according to the voltage value corresponding to the voltage signal;
According to a first algorithm, calculating a voltage weighting value corresponding to the voltage value;
Sampling the current signal on the energy storage element at the receiving position of the electromagnetic wave signal according to a set frequency in a fifth set time period;
calculating the current change speed of the current signal according to the current value corresponding to the current signal;
according to a second algorithm, calculating a current weighting value corresponding to the current value;
According to the voltage weighted value and the current weighted value, and the voltage change speed and the current change speed; calculating an early warning value;
Early warning value = voltage weighted value x Σ voltage change rate + current weighted value x Σ current change rate;
and outputting a trigger signal when the early warning value exceeds a preset early warning threshold value.
By adopting the technical scheme, after receiving the electromagnetic wave signal, sampling the voltage at the receiving position and the current on the energy storage element, and indirectly judging the strength change condition of the electromagnetic wave signal by detecting the change of the voltage and the change of the current, thereby carrying out early warning and triggering according to the threshold value.
Optionally, the electromagnetic wave signal is received by an antenna, the antenna being grounded by a filter element; the antenna is also electrically connected with an energy storage element through a first sampling resistor, and the output end of the energy storage element is grounded through a second sampling resistor; wherein the voltage on the first sampling resistor is a voltage signal at the receiving place of the sampled electromagnetic wave signal; the current on the second sampling resistor is the current signal on the energy storage element at the position where the sampled electromagnetic wave signal is received.
By adopting the technical scheme, the antenna, the filter element, the energy storage element and the corresponding sampling resistor are provided, and the current and the voltage in the circuit after the electromagnetic wave is received are sampled, so that the signal state of the electromagnetic wave is indirectly judged.
Optionally, the energy storage element comprises a capacitor, and the capacitor is a variable capacitor with an adjustable capacitance value; the method further comprises the steps of:
Adjusting the capacitance value of the variable capacitor according to the voltage value and the current value;
increasing the capacitance of the variable capacitor when the decay rate of the current value is greater than the current threshold;
And when the decay speed of the current value is smaller than a current threshold value, reducing the capacitance value of the variable capacitor.
By adopting the above technical scheme, the decay rate of the current value refers to the rate at which the current decreases with time; when the decay rate of the current value is greater than a certain preset current threshold value, this means that the current drops very rapidly. To slow down the rate of current drop, the capacitance of the capacitor is increased to store more charge, thereby providing a more stable current output. Conversely, when the decay rate of the current value is less than the current threshold, it means that the current drops slower or has stabilized. To optimize energy storage efficiency or respond to other system demands, the capacitance of the capacitor may be reduced.
Optionally, the method further comprises:
According to the preset frequency, outputting a charge elimination prompt signal;
the energy storage element eliminates the electric quantity on the energy storage element based on the charge elimination prompt signal.
By adopting the technical scheme, the electric quantity on the energy storage element is eliminated, and the interference of other factors, such as the accuracy of equipment searching, can be reduced. The charge elimination prompt signal is output as prompt to remind personnel of operation, and a specific elimination mode can be realized through short circuit or diode discharge and other operations.
The application provides a voice prompt system, which adopts the following technical scheme:
The voice prompt system comprises a processor and a voice playing module, wherein the processor is internally provided with a program of the signal triggering method based on the electromagnetic wave signal, and the program is used for generating a triggering signal;
the voice playing module is used for responding to the trigger signal and outputting voice prompt information.
In summary, the present application includes at least one of the following beneficial technical effects: the original triggering mode of frequency band matching is reserved, the energy judging mode is further added, and whether triggering is needed or not is judged by accumulating the energy; for example, although the remote controller is not matched with the device, under the condition that electromagnetic wave signals are continuously sent out in a set range, accumulated energy is larger, a trigger signal can be sent out, so that the triggering mode of the electromagnetic wave signals is expanded, and the remote controller is favorable for quick triggering, such as convenient and quick equipment finding operation and the like, especially in emergency.
Drawings
Fig. 1 is a method step diagram of a signal triggering method based on an electromagnetic wave signal according to an embodiment of the present application.
Fig. 2 is a step diagram of a method for determining an electromagnetic wave with a frequency band not matched according to an attenuation speed of an electromagnetic wave amplitude in a signal triggering method based on an electromagnetic wave signal according to an embodiment of the present application.
Fig. 3 is a method step diagram of adjusting a preset geographical range through power spectrum density in a signal triggering method based on an electromagnetic wave signal according to an embodiment of the present application.
Fig. 4 is a method step diagram of calculating a correlation value of an electromagnetic wave signal in a signal triggering method based on the electromagnetic wave signal according to an embodiment of the present application.
Fig. 5 is a diagram of steps of a method for implementing signal triggering according to values of sampling current and voltage in a signal triggering method based on electromagnetic wave signals according to an embodiment of the present application.
Fig. 6 is a circuit diagram of a receiving circuit in a signal triggering method based on an electromagnetic wave signal according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the inventive concepts. As part of this specification, some of the drawings of the present disclosure represent structures and devices in block diagram form in order to avoid obscuring the principles of the disclosure. In the interest of clarity, not all features of an actual implementation are necessarily described. Furthermore, the language used in the present disclosure has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter, resort to the requisite claims to determine such inventive subject matter. Reference in the present disclosure to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment, and multiple references to "one embodiment" or "an embodiment" should not be understood as necessarily all referring to the same embodiment.
The terms "a," "an," and "the" are not intended to refer to a singular entity, but rather include the general class of which a particular example may be used for illustration, unless clearly defined. Thus, the use of the terms "a" or "an" may mean any number of at least one, including "one", "one or more", "at least one", and "one or more than one". The term "or" means any of the alternatives and any combination of alternatives, including all alternatives, unless alternatives are explicitly indicated as mutually exclusive. The phrase "at least one of" when combined with a list of items refers to a single item in the list or any combination of items in the list. The phrase does not require all of the listed items unless specifically so defined.
The embodiment of the application discloses a signal triggering method based on electromagnetic wave signals.
Referring to fig. 1, a signal triggering method based on an electromagnetic wave signal includes the steps of:
receiving electromagnetic wave signals in a preset geographic range; the reception mode can be realized by an antenna or a receiver. The predetermined geographic range may be, for example, initially within 20 meters of each other.
Noise reduction is carried out on the received electromagnetic wave signals; because electromagnetic wave signals may be interfered by various noises in the propagation process, noise reduction processing is required to be carried out on the signals so as to improve the signal-to-noise ratio; specifically, the method can be realized by means of commonly used filters, software algorithms and the like.
Analyzing the electromagnetic wave after noise reduction; parsing refers to converting electromagnetic wave signals from analog signals to digital signals and further processing to extract information therein. For example, the method comprises the steps of demodulation, decoding and the like, and depends on the modulation mode and the coding mode of the signals.
Intercepting the electromagnetic wave signal of the first set frequency band after analysis; the first set frequency band is a preset frequency range, for example, the first set frequency band is a frequency band of 100-300MHz in 30MHz to 3000 MHz; the frequency of the intercepted and analyzed electromagnetic wave in the first set frequency band is 1000-200MHz. Wherein, 30MHz to 3000MHz are ultrashort wave communication, and the communication mode commonly used in fire fighting and rescue actions by fire fighting forces.
If the matching degree of the frequency band of the electromagnetic wave signal in the first set frequency band and the preset frequency band is larger than or equal to a preset value, outputting a trigger signal; and calculating the matching degree by comparing the frequency distribution, the energy distribution or other characteristics of the first set frequency band and the preset frequency band. For example, the electromagnetic wave signal in the first set frequency band is 1000-200MHz, and the preset frequency band is 150-250MHz. The matching degree is one hundred percent, wherein the preset value is 90 percent.
If the matching degree reaches or exceeds a preset value, the signal is related to a preset frequency band, and a trigger signal is output for subsequent processing. The trigger signal may be a level signal, or may be an edge trigger signal.
If the matching degree of the frequency band of the electromagnetic wave signals in the first set frequency band and the preset frequency band is lower than the preset value, calculating the energy corresponding to the electromagnetic wave signals in the first set frequency band, and calculating the accumulated energy corresponding to the electromagnetic wave signals in the first set frequency band in the first set time period; and outputting a trigger signal when the accumulated energy is greater than or equal to an energy threshold. If the match is below the preset value, but the signal may still have potential importance, the accumulated energy of the electromagnetic wave signal in the first set frequency band is continuously calculated in the set first set time period by further considering the accumulated energy of the signal. The calculation method of the accumulated energy E comprises the following steps: e=p×t, where energy is E and power is P, i.e. the accumulated energy is the integral of power over time. The power P is measured or estimated to obtain the power P of electromagnetic waves emitted by the remote controller at a receiving point, and a specific power meter or electromagnetic field intensity meter is placed near the receiving point, so that the environment between the power P and the remote controller is ensured to be as close as possible to the actual use scene.
The original triggering mode of frequency band matching is reserved, the energy judging mode is further added, and whether triggering is needed or not is judged through the accumulated energy. For example, although the triggered remote controller is not matched with the device to be triggered, in the set range, under the condition of continuously sending out electromagnetic wave signals, the accumulated energy is larger, the trigger signal can also be sent out, the triggering mode of the electromagnetic wave signals is expanded, and particularly in emergency, the quick triggering is facilitated, and therefore the quick finding of equipment or the alarm and other operations are facilitated.
Referring to fig. 2, in addition to the judgment by the magnitude of the accumulated energy, the electromagnetic wave whose frequency band is not matched can be further judged by the attenuation speed of the electromagnetic wave amplitude. The specific method also comprises the following steps:
If the matching degree of the frequency band of the electromagnetic wave signal in the first set frequency band and the preset frequency band is lower than a preset value, acquiring the electromagnetic wave amplitude of the electromagnetic wave signal in the first set frequency band in a second set time period;
Calculating the attenuation speed of the electromagnetic wave amplitude; the decay rate may be calculated by comparing amplitude values at different points in time, for example using linear regression, difference or other mathematical methods.
If the electromagnetic wave amplitude is higher than the amplitude threshold value and the electromagnetic wave amplitude attenuation speed is smaller than the attenuation threshold value, a trigger signal is output. If the received electromagnetic wave decays slowly in a certain geographical range, it means that there is always an electromagnetic wave emission received, so that according to this state, signal triggering based on the electromagnetic wave signal is achieved.
In addition, the method can also combine the attenuation speed and the accumulated energy to comprehensively judge, thereby realizing a more accurate triggering method.
Referring to fig. 3, the method further comprises:
Carrying out frequency domain analysis on electromagnetic wave signals in a first set frequency band; the time domain signal is converted to a frequency domain signal using a fourier transform (e.g., a fast fourier transform FFT).
Obtaining frequency domain information of electromagnetic wave signals; the frequency domain information includes information such as frequency distribution, magnitude spectrum, etc. of the signal.
Calculating the power spectrum density corresponding to the frequency domain information; where Power Spectral Density (PSD) is a physical quantity describing how signal power is distributed over the frequency domain. The power spectral density may be obtained by normalizing the square of the magnitude spectrum. The general calculation formula of the power spectral density is PSD (F) = |F (F) |2/T, where F (F) is the Fourier transform of the signal and T is the time length of the signal. This formula shows that to calculate the power spectral density at a certain frequency, it is necessary to first calculate the fourier transform of the signal at that frequency, then square its modulus, and finally divide by the total time length of the signal.
Adjusting the energy threshold according to the power spectral density, wherein if the power spectral density is larger, the energy threshold is larger; the smaller the power spectral density, the smaller the energy threshold. Where the power spectral density is greater, indicating that the energy distribution of the signal in the frequency domain is more concentrated, it may be desirable to raise the energy threshold to more accurately identify the signal. If the power spectral density is small, which means that the energy distribution of the signal in the frequency domain is more scattered, the energy threshold may need to be lowered to avoid erroneous judgment. For example, the power spectral density is 100, and the energy threshold is 10; the power spectral density 120, the energy threshold is 12. The numerical examples of the present embodiment do not relate to actual numerical values, are merely references to magnitudes, and do not have unit calculations.
Or the area of the preset geographical range is adjusted according to the power spectrum density, and the larger the power spectrum density is, the smaller the area of the preset geographical range is; the smaller the power spectral density, the larger the area of the preset geographic range. If the power spectral density is large, indicating that the signal may come from a closer area, the area of the predetermined geographic area may be reduced to more precisely locate the signal source. If the power spectral density is small, indicating that the signal may come from a far away area, the area of the pre-set geographic area may be enlarged to cover a wider search area. For example, the preset geographical range is adjusted to a range of 25 meters to expand the range of the received electrical signal, thereby capturing electromagnetic wave signals that may exist as much as possible.
Therefore, in order to reduce the interference of noise, when the power spectrum density is larger, the energy threshold is larger or the preset geographical range is smaller, so that the accuracy of the result is guaranteed.
Referring to fig. 4, if the matching degree between the frequency band of the electromagnetic wave signal in the first set frequency band and the preset frequency band is lower than the preset value, the method may be replaced by:
Intercepting electromagnetic wave signals in a second set frequency band in a third set time period; the range of the second set frequency band is larger than that of the first set frequency band, so as to capture related signals which may exist.
Performing spectrum analysis on the intercepted electromagnetic wave signals in the second set frequency band; the time domain signal is also converted to a frequency domain signal using a fourier transform, such as a fast fourier transform FFT.
Analyzing N different electromagnetic wave signals, and calculating correlation coefficients between any two electromagnetic wave signals; the correlation coefficient is a value between-1 and 1 that is used to measure the linear correlation between the two signals. If the two signals are completely positively correlated, the correlation coefficient is 1; if the correlation is completely negative, the correlation coefficient is-1; if there is no correlation, the correlation coefficient is 0.
The number of electromagnetic wave signals with the cumulative correlation coefficient greater than 0 (i.e., positive correlation) is n;
Calculating the correlation value of the electromagnetic wave signal in a second set frequency band; correlation value = N/N; where N is the total number of electromagnetic wave signals analyzed, and N is the number of signal pairs whose correlation coefficient is greater than 0.
And if the correlation value is greater than the correlation threshold value, outputting a trigger signal. If the calculated correlation value is greater than the preset correlation threshold, it indicates that there are more positive correlation signals in the second set frequency band, which may indicate a specific signal pattern or event. In this case, a trigger signal is output for subsequent processing or alerting.
Because of the multiple devices of the same type, the frequency bands of the matched electromagnetic waves are mostly similar or similar. That is, the received electromagnetic wave signals are similar, if the received electromagnetic wave signals are similar electromagnetic wave signals, when the electromagnetic wave signals are in the second set frequency band and the correlation value is larger, triggering can be started; that is, the devices of the same type and different frequency bands can be realized by one remote controller under a certain precondition, and the matching and the corresponding are not needed one by one.
The method further comprises the steps of:
Calculating the acceleration of the accumulated energy in a fourth set time period according to the accumulated energy, and adjusting the tone of the voice prompt when the acceleration exceeds an acceleration threshold; wherein acceleration describes how fast the accumulated energy changes over time. In order to calculate the acceleration, the accumulated energy value of at least three points in time is required. Assuming three time points T1, T2, T3 (where t2=t1+dt and t3=t2+dt) and corresponding accumulated energy values E1, E2, E3, the acceleration a may be approximated as: (E1-2×E2+E3)/dT 2.
And the larger the accumulated energy, the larger the pitch; the smaller the accumulated energy, the smaller the pitch. If a better voice prompt is desired, a mapping function or audio processing algorithm is specifically required to generate a more natural and accurate voice prompt tone. In addition, a suitable audio processing library (e.g., pyAudio, pygame, etc.) is required to generate and play the voice prompts of the different tones.
Because the tone changes, the sound frequency changes, if the accumulated energy is larger, the larger the energy of the received electromagnetic wave is, which means that the closer the electromagnetic wave is received, the more the equipment can be found out quickly through the tone changes.
Referring to fig. 5, if the matching degree between the frequency band of the electromagnetic wave signal in the first set frequency band and the preset frequency band is lower than the preset value, the method may be replaced by:
sampling a voltage signal at the receiving position of the electromagnetic wave signal according to a set frequency in a fifth set time period; for example 10 voltage signals per second.
Calculating the voltage change speed of the voltage value according to the voltage value corresponding to the voltage signal; the difference between the current sampled voltage and the last sampled voltage value is calculated and divided by the sampling time interval (i.e. the time difference between the two samples) to obtain the voltage change speed.
According to a first algorithm, calculating a voltage weighting value corresponding to the voltage value; the first algorithm is that the voltage weighting value is a discrete coefficient of voltage value variation.
Sampling the current signal on the energy storage element at the electromagnetic wave signal receiving position according to the set frequency in a fifth set time period; also in the fifth set period of time, the current signal on the energy storage element at the electromagnetic wave signal reception site is sampled at the same frequency.
Calculating the current change speed of the current signal according to the current value corresponding to the current signal; the difference between the current sampled and the current sampled last is calculated and divided by the sampling time interval (i.e. the time difference between the two samples) to obtain the current change rate.
According to a second algorithm, calculating a current weighting value corresponding to the current value; the second algorithm is that the current weighting value is a discrete coefficient of current value variation.
According to the voltage weighted value and the current weighted value, the voltage change speed and the current change speed; and calculating an early warning value.
Early warning value = voltage weighted value x Σ voltage change rate + current weighted value x Σ current change rate; the specific calculation in this embodiment is simply a numerical calculation, and is a unitless calculation. For example, voltage weighting values: 0.5; current weighting value: 0.7; speed of voltage change (assuming the sum of the speeds of change at three time points): sigma voltage change speed=2+3+1=6; current change speed (assuming the sum of change speeds at three time points as well): sigma current change speed=1+2+3=6; we can substitute these values into a given formula to calculate the early warning value: early warning value = voltage weighting value x Σ voltage change speed + current weight value x Σ current change speed=0.5×6+0.7×6=7.2.
And outputting a trigger signal when the early warning value exceeds a preset early warning threshold value. For example, the early warning threshold is 10.
After receiving the electromagnetic wave signal, sampling the voltage at the receiving position and the current on the energy storage element, and indirectly judging the strength change condition of the electromagnetic wave signal by detecting the change of the voltage and the change of the current, thereby carrying out early warning and triggering according to the threshold value. The application comprehensively considers the change condition of voltage and current and the change speed to evaluate the state of the system and send out early warning when the threshold value is exceeded.
Referring to fig. 6, the reception of electromagnetic waves may be achieved by the following reception circuit:
The receiving circuit comprises an antenna N; one end of the antenna N is grounded through a capacitor C6, and the branch is also connected in series with a switch; one end of the antenna N is grounded through a capacitor C5, and the branch is also connected in series with a switch; one end of the antenna N is also grounded through a capacitor C4, and the branch is also connected in series with a switch. The antenna N is electrically connected to the anode of the diode D1 through the first sampling resistor R1, the cathode of the diode D1 is electrically connected to one end of the capacitor C1, and the other end of the capacitor C1 is grounded through the second sampling resistor R2. And the capacitor C2 and the capacitor C3 are connected in parallel at two ends of the capacitor C1.
The electromagnetic wave signal is received by an antenna N, and the antenna N is grounded by a filter element (capacitors C4-C6); wherein the capacitors C4-C6 may also comprise a larger number of capacitors. The antenna N is also electrically connected to energy storage elements (capacitors C1-C3) through a first sampling resistor, wherein the capacitors C1-C3 may also comprise a larger number of capacitors. The output end of the energy storage element is grounded through a second sampling resistor. The voltage on the first sampling resistor is a voltage signal at the receiving position of the sampled electromagnetic wave signal; the current on the second sampling resistor is the current signal on the energy storage element where the sampled electromagnetic wave signal is received.
In order to further optimize the signal triggering method of the triggering signal, the capacitor is a variable capacitor with an adjustable capacitance value; the method further comprises the steps of:
adjusting the capacitance value of the variable capacitor according to the voltage value and the current value; the variable capacitor may be, for example, a voltage variable capacitor: the capacitor dielectric typically contains lithium niobate crystals that distort when a voltage is applied to the capacitor, causing a change in the capacitance value.
When the decay speed of the current value is greater than the current threshold value, increasing the capacitance value of the variable capacitor;
When the decay rate of the current value is less than the current threshold value, the capacitance value of the variable capacitor is reduced. For example, when the decay rate is greater than a (current threshold), the capacitance of the variable capacitor increases by 1 percent; when the decay rate is less than a (current threshold), the capacitance of the variable capacitor decreases by 1 percent.
The decay rate of the current value refers to the rate at which the current decreases with time; when the decay rate of the current value is greater than a certain preset current threshold value, this means that the current drops very rapidly. To slow down the rate of current drop, the capacitance of the capacitor is increased to store more charge, thereby providing a more stable current output. Conversely, when the decay rate of the current value is less than the current threshold, it means that the current drops slower or has stabilized. To optimize energy storage efficiency or respond to other system demands, the capacitance of the capacitor may be reduced.
The method further comprises the steps of:
According to the preset frequency, outputting a charge elimination prompt signal; for example, 1 time per week or once per day.
The energy storage element eliminates the electric quantity on the energy storage element based on the electric charge elimination prompt signal.
The electric quantity on the energy storage element is eliminated, so that interference of other factors can be reduced, for example, the accuracy of equipment searching is improved. The charge elimination prompt signal is output as prompt to remind personnel of operation, and a specific elimination mode can be realized through short circuit or diode discharge and other operations. The energy storage element is grounded, for example, by a wire, so that a rapid discharge operation is achieved. For example, a diode is connected in parallel to the energy storage element, and the diode is used for discharging, so that a slow discharging operation is realized. The diode may be connected in series with a switch, which is then integrally connected in parallel with the energy storage element, and when not discharging, the switch is in an off state. When discharging is needed, the switch is in a closed state.
The embodiment of the application discloses a voice prompt system. Referring to fig. 1, the system comprises a processor and a voice playing module, wherein the processor runs a program of the signal triggering method based on the electromagnetic wave signal, and the program is used for generating a triggering signal; and the voice playing module is electrically connected to the processor and is used for responding to the trigger signal and outputting voice prompt information.
The processor is enclosed in a carrier for protecting the processor for ease of use, which is secured to the piece to be attached, such as a fire extinguisher, or emergency equipment, by an attachment assembly.
The voice playing module comprises a loudspeaker and a memory, wherein the memory stores audio files such as recording files or music fragments and the like. For example, when looking for a device, the speaker may play, the device is in a certain location, etc.
In particular, the attachment assembly may comprise an absorbent member, a snap-fit structure or an adhesive structure.
The adsorption piece comprises a sucker which is used for being fixed on the carrier, and the sucker is used for being fixed on the to-be-attached object in an adsorption mode.
The adsorption piece comprises a magnetic adsorption piece used for being adsorbed on the to-be-attached object, and the adsorption piece is fixed on the to-be-attached object in a magnetic adsorption mode.
The clamping structure comprises a clamping piece and a clamping piece which are connected in a clamping mode, the clamping piece is connected to the carrier, and the clamping piece is fixedly connected to the to-be-attached object.
The adhesive structure comprises an adhesive layer, and the adhesive layer is connected between the carrier and the to-be-attached object.
Not only carry out voice prompt based on the triggering mode of multiple electromagnetic waves, but also realize the reuse of voice prompt assembly through multiple attachment mode, can improve the value of utilizing of voice prompt assembly. For example, in the event of a fire, people need to find nearby extinguishers in an urgent manner; and the danger can be reduced by one part every 1 second when the time for searching the fire extinguisher is reduced. Since most fire extinguishers do not have a voice prompt function, if the existing fire extinguishers without the voice prompt function are all replaced with the fire extinguishers with the voice prompt function, great cost is required. In addition, because the fire extinguisher is a disposable article, if the voice prompt component is also scrapped together after use, the fire extinguisher is also a resource waste; and the attachable structure can realize repeated utilization, so that the utilization value of the voice prompt system can be improved.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (8)
1. The signal triggering method based on the electromagnetic wave signal is characterized by comprising the following steps: receiving electromagnetic wave signals in a preset geographic range;
Noise reduction is carried out on the received electromagnetic wave signals;
analyzing the electromagnetic wave after noise reduction;
Intercepting the electromagnetic wave signal of the first set frequency band after analysis;
Outputting a trigger signal if the matching degree of the frequency band of the electromagnetic wave signal in the first set frequency band and the preset frequency band is greater than or equal to a preset value;
if the matching degree between the frequency band of the electromagnetic wave signal in the first set frequency band and the preset frequency band is lower than the preset value,
Calculating the energy corresponding to the electromagnetic wave signal in the first set frequency band, and calculating the accumulated energy corresponding to the electromagnetic wave signal in the first set frequency band in a first set time period; when the accumulated energy is greater than or equal to an energy threshold, outputting a trigger signal;
And/or acquiring the electromagnetic wave amplitude of the electromagnetic wave signal in the first set frequency band within a second set time period; calculating the attenuation speed of the electromagnetic wave amplitude; outputting a trigger signal if the electromagnetic wave amplitude is higher than an amplitude threshold and the electromagnetic wave amplitude attenuation speed is smaller than an attenuation threshold;
if the matching degree between the frequency band of the electromagnetic wave signal in the first set frequency band and the preset frequency band is lower than the preset value, the method can be replaced by:
intercepting the electromagnetic wave signals in a second set frequency band in a third set time period; wherein the range of the second set frequency band is larger than the range of the first set frequency band;
performing spectrum analysis on the intercepted electromagnetic wave signals in the second set frequency band;
analyzing N different electromagnetic wave signals, and calculating correlation coefficients between any two electromagnetic wave signals;
The number of the electromagnetic wave signals with the accumulated correlation coefficient larger than 0 is n;
Calculating a correlation value of the electromagnetic wave signal in the second set frequency band; the correlation value = N/N;
if the correlation value is greater than the correlation threshold, outputting a trigger signal;
if the matching degree between the frequency band of the electromagnetic wave signal in the first set frequency band and the preset frequency band is lower than the preset value, the method can be replaced by:
sampling the voltage signal at the receiving position of the electromagnetic wave signal according to a set frequency in a fifth set time period;
Calculating the voltage change speed of the voltage value according to the voltage value corresponding to the voltage signal;
according to a first algorithm, calculating a voltage weighted value corresponding to the voltage value, wherein the voltage weighted value is a discrete coefficient of voltage value change;
Sampling the current signal on the energy storage element at the receiving position of the electromagnetic wave signal according to a set frequency in a fifth set time period;
calculating the current change speed of the current signal according to the current value corresponding to the current signal;
according to a second algorithm, calculating a current weighting value corresponding to the current value, wherein the current weighting value is a discrete coefficient of current value change;
According to the voltage weighted value and the current weighted value, and the voltage change speed and the current change speed; calculating an early warning value;
Early warning value = voltage weighted value x Σ voltage change rate + current weighted value x Σ current change rate;
and outputting a trigger signal when the early warning value exceeds a preset early warning threshold value.
2. The method of signal triggering based on electromagnetic wave signals according to claim 1, further comprising:
performing frequency domain analysis on the electromagnetic wave signals in the first set frequency band;
obtaining frequency domain information of the electromagnetic wave signal;
calculating the power spectrum density corresponding to the frequency domain information;
Adjusting the magnitude of the energy threshold according to the power spectral density, wherein the energy threshold is larger if the power spectral density is larger; the smaller the power spectral density, the smaller the energy threshold.
3. The method of signal triggering based on electromagnetic wave signals according to claim 1, further comprising:
performing frequency domain analysis on the electromagnetic wave signals in the first set frequency band;
obtaining frequency domain information of the electromagnetic wave signal;
calculating the power spectrum density corresponding to the frequency domain information;
Adjusting the area of the preset geographical range according to the power spectral density, wherein the larger the power spectral density is, the smaller the area of the preset geographical range is; the smaller the power spectral density, the larger the area of the preset geographical range.
4. The method of signal triggering based on electromagnetic wave signals according to claim 1, further comprising:
Calculating the acceleration of the accumulated energy in a fourth set time period according to the accumulated energy, and adjusting the tone of the voice prompt when the acceleration exceeds an acceleration threshold;
and the larger the accumulated energy, the larger the pitch; the smaller the accumulated energy, the smaller the pitch.
5. The signal triggering method based on electromagnetic wave signals according to claim 1, wherein the electromagnetic wave signals are received through an antenna, the antenna being grounded through a filter element; the antenna is also electrically connected with an energy storage element through a first sampling resistor, and the output end of the energy storage element is grounded through a second sampling resistor; wherein the voltage on the first sampling resistor is a voltage signal at the receiving place of the sampled electromagnetic wave signal; the current on the second sampling resistor is the current signal on the energy storage element at the position where the sampled electromagnetic wave signal is received.
6. The signal triggering method based on electromagnetic wave signals as recited in claim 5, wherein the energy storage element includes a capacitor, the capacitor being a variable capacitor with an adjustable capacitance value; the method further comprises the steps of:
Adjusting the capacitance value of the variable capacitor according to the voltage value and the current value;
increasing the capacitance of the variable capacitor when the decay rate of the current value is greater than the current threshold;
And when the decay speed of the current value is smaller than a current threshold value, reducing the capacitance value of the variable capacitor.
7. The method of signal triggering based on electromagnetic wave signals according to claim 5, further comprising:
According to the preset frequency, outputting a charge elimination prompt signal;
the energy storage element eliminates the electric quantity on the energy storage element based on the charge elimination prompt signal.
8. A voice prompt system, comprising a processor and a voice playing module, wherein the processor runs a program of the signal triggering method based on electromagnetic wave signals according to any one of claims 1-7, and is used for generating triggering signals;
the voice playing module is used for responding to the trigger signal and outputting voice prompt information.
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