CN113834560B - Animal hearing evaluation detection device and method - Google Patents
Animal hearing evaluation detection device and method Download PDFInfo
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- CN113834560B CN113834560B CN202010520509.4A CN202010520509A CN113834560B CN 113834560 B CN113834560 B CN 113834560B CN 202010520509 A CN202010520509 A CN 202010520509A CN 113834560 B CN113834560 B CN 113834560B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
- G10L25/51—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for comparison or discrimination
- G10L25/60—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for comparison or discrimination for measuring the quality of voice signals
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L17/00—Speaker identification or verification
- G10L17/26—Recognition of special voice characteristics, e.g. for use in lie detectors; Recognition of animal voices
Abstract
The invention discloses an animal hearing evaluation detection device and method, comprising a system control end, a wireless control generation module, a remote sound field generation system, an FPGA module, a fiber laser vibration meter, a WIFI monitoring camera and a glass cover, wherein the wireless control generation module is assembled in the glass cover, and the system control end is in wireless communication with the wireless control generation module. The animal hearing evaluation detection device and method provided by the invention have the following advantages: 1. realize the remote sound detection, avoid placing the sensing device aside the animal body and bring the problem. 2. The sound generating module sends out sound signals with specific frequency and amplitude in one mode, and sends out sound signals with specific amplitude and frequency in the other mode, so that the sound generating module can be more suitable for the hearing habit of animals. 3. The animal response monitoring module is added to monitor the response of the animal in the simulation of sound, and the combination of the video and the audio is beneficial to the evaluation of the hearing of the animal.
Description
Technical Field
The invention relates to the technical field of auditory evaluation and detection, in particular to an animal auditory evaluation and detection device and method.
Background
By measuring the hearing of an animal, one can help to understand the health status of the animal, which can help to prevent disease and prevent diffusion.
The evaluation of the hearing of an animal requires the detection of the frequency and power of the actual simulated sound in the area of the animal, in which prior art the detection of the sound in the area of the animal requires the placement of a mechanical sound detection device in the vicinity of the animal. On one hand, the mechanical sound detection equipment is low in precision and difficult to detect weak sound signals, and on the other hand, the huge mechanical sound detection equipment is arranged beside animals and is easy to be interfered by environmental noise, and the animals to be detected are possibly frightened, so that equipment maintenance is not facilitated.
Based on the defects, an animal hearing evaluation detection device and method are provided.
Disclosure of Invention
The invention aims to provide an animal hearing evaluation detection device and method, which realize remote sound detection, avoid the problems caused by placing sensing equipment beside an animal body, and enable a sound generating module to emit sound signals with specific frequency and amplitude in one mode and emit sound signals with specific amplitude and frequency in a change sequence in the other mode, so that the device and method can be more suitable for the hearing habit of the animal; the animal response monitoring module is added to monitor the response of the animal in the simulation of sound, and the combination of the video and the audio is beneficial to the evaluation of the hearing of the animal so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the animal hearing evaluation detection device comprises a system control end, a wireless control generation module, a remote sound field generation system, an FPGA module, an optical fiber laser vibration meter, a WIFI monitoring camera and a glass cover, wherein the wireless control generation module is assembled in the glass cover, the system control end is in wireless communication with the wireless control generation module, the wireless control generation module is in wireless communication with the optical fiber laser vibration meter, the output end of the optical fiber laser vibration meter is connected with the input end of the FPGA module, the output end of the FPGA module is connected with the system control end, and the signal transmitting end of the WIFI monitoring camera is connected with the system control end;
and the system control end: the device is used for the wireless control generating module to send frequency and amplitude data of sound signals, receiving feedback signals returned by the wireless control generating module, and observing the demodulated vibration waveform output by the fiber laser vibration meter.
The wireless control generation module is arranged in the glass cover and emits sound signals corresponding to the frequency and amplitude data so as to cause the surface of the glass cover to vibrate and transmit the vibration to the auditory system of the animal; the wireless control generation module sends a feedback signal to the system control end to confirm the frequency and the amplitude of the signal sent currently.
The remote sound field generation system detects the frequency and the power of the actual simulated sound of the area where the animal is located through the optical fiber sensor, and the modulated optical signal of the optical fiber sensor is vertically incident to the surface of the glass cover through the collimator and is reflected back to the collimator, so that the vibration waveform of the surface of the glass cover is demodulated to reflect the frequency and the power of the actual simulated sound of the area where the animal is located.
Preferably, the WIFI monitoring camera is connected with the system control end through WIFI and is used for observing the response of the animal when the wireless control generation module sends out the simulated sound with specific frequency and amplitude.
Preferably, the glass cover is kept at a distance of not more than 30m from the animal to be tested.
Preferably, the wireless control generation module adopts a Bluetooth control generation module, the Bluetooth control generation module comprises a microprocessor, a power supply, a signal generator, a Bluetooth module, a singlechip, a passive buzzer, a primary filter, a primary amplifier, a DDS integrated chip and a D/A conversion integrated chip, wherein the singlechip adopts a chip U0 as a main chip, the model of the main chip U0 is STM32F, the DDS integrated chip adopts a chip U1, the model of the chip U1 is AD9834, the D/A conversion integrated chip adopts a chip U4, and the model of the chip U4 is AD5620; the Bluetooth module is electrically connected with the singlechip, the singlechip is electrically connected with the signal generator, the output end of the signal generator is electrically connected with the input end of the primary amplifier, the output end of the primary amplifier is electrically connected with the input end of the primary filter, and the output end of the primary filter is electrically connected with the input end of the passive buzzer; the single chip microcomputer is electrically connected with the microprocessor, and the microprocessor, the signal generator, the Bluetooth module, the single chip microcomputer and the passive buzzer are electrically connected with the power supply.
Preferably, the remote sound field generation system detects the frequency and power of the actual simulated sound of the region where the animal is located through an optical fiber sensor, wherein the optical fiber sensor comprises a laser, a PZT ring, a Mach-Zehnder interferometer, a circulator, a collimator, a photoelectric detector and an FPGA module; the laser carries out high-frequency modulation through the PZT ring, and then the optical signals input into the Mach-Zehnder interferometer are divided into modulated optical signals and reference optical signals through the optical coupler, wherein the modulated optical signals are vertically incident to the surface of the glass cover through the circulator and the collimator and reflected back to the collimator, the vibration signals are coupled into the optical signals through the Doppler effect, two paths of signals output from the Mach-Zehnder interferometer are output through the photoelectric detector, the two paths of electric signals are input into the FPGA module after being differenced, and the signals sequentially pass through the subtracting module, the mixing module, the differential cross multiplying module, the integrating module and the high-pass filtering module.
Preferably, weak signal generation in the wireless control generation module is realized by a low-power-consumption direct digital frequency synthesis DDS chip and a low-power-consumption DAC.
The invention provides another technical scheme that: a method of animal hearing assessment detection comprising the steps of:
s1: placing a system control end, a wireless control generation module, a remote sound field generation system, an FPGA module, an optical fiber laser vibration meter, a WIFI monitoring camera and a glass cover in a quiet environment, placing a hardware circuit in the wireless control generation module in the glass cover, and enabling the distance between an animal to be tested and the glass cover to be no more than 30m;
s2: a control end of the system is connected with a remote sound field generating system by using Bluetooth, so as to remotely control a frequency generating mode and the frequency and the amplitude of a sound signal; firstly, suspending emitting of sound signals, keeping the environment quiet in a period of time, and monitoring the state of animals;
s3: the system control end sends three values to the wireless control generation module each time, wherein the three values comprise a frequency generation mode selection value, a frequency value and an amplitude value; in the mode, the singlechip transmits a frequency numerical sequence to the DDS module, so that the DDS module generates waveforms with unchanged amplitude and frequency variation; in the second mode, the DDS module generates sine waveforms with fixed amplitude and fixed frequency, so that the wireless control generation module emits sound with specific frequency and amplitude;
s4: monitoring the state of the animal, and judging that the animal can hear weak sound if the animal has different reactions such as moving position, head raising, changing action, eyeball rotation and the like compared with the state of silence; simultaneously, a remote sound field generating system is used for measuring the amplitude and the frequency of a sound signal of the position where the small animal is located, and recording the amplitude and the frequency, and the amplitude and the frequency are used for quantifying the perception capability of the small animal on weak sound;
s5: repeating the step S3 and the step S4, and finding out the range of the sound signal which can be perceived by the animal;
s6: and screening experimental data obtained by detection to obtain a conclusion.
Compared with the prior art, the invention has the beneficial effects that: the animal hearing evaluation detection device and method provided by the invention have the following advantages:
1. the sounding module is arranged in the glass cover, the glass cover is arranged beside an animal to be detected, the vibration on the surface of the glass cover represents the frequency and the amplitude of the sound of the point where the animal is positioned, and the vibration waveform on the surface of the glass is detected by the optical fiber sensor, so that high-precision sound detection is realized; meanwhile, the collimator is used for emitting modulated laser and receiving reflected light signals to detect the vibration of the glass surface, and the mode can realize remote sound detection, so that the problem caused by placing the sensing equipment beside an animal body is avoided.
2. The sound generating module sends out sound signals with specific frequency and amplitude in one mode, and sends out sound signals with specific amplitude and frequency in the other mode, so that the sound generating module can be more suitable for the hearing habit of animals.
3. The animal response monitoring module is added to monitor the response of the animal in the simulation of sound, and the combination of the video and the audio is beneficial to the evaluation of the hearing of the animal.
Drawings
FIG. 1 is a system scene layout of the present invention;
FIG. 2 is a block diagram of the system of the present invention;
FIG. 3 is a schematic circuit diagram of a singlechip in the sounding module of the present invention;
fig. 4 is a schematic circuit diagram of a DDS integrated chip in the bluetooth control sounding module according to the present invention;
FIG. 5 is a schematic circuit diagram of a D/A conversion integrated chip in a Bluetooth control sounding module according to the present invention;
FIG. 6 is a block diagram of the operation of the remote sound field detection module of the present invention;
fig. 7 is a flow chart of a method implementation of the present invention.
In the figure: 1. a system control end; 2. a wireless control generation module; 3. a remote sound field generation system; 4. an FPGA module; 5. an optical fiber laser vibration meter; 6. WIFI monitoring camera; 7. a glass cover.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-2, an animal hearing evaluation detection device includes a system control end 1, a wireless control generation module 2, a remote sound field generation system 3, an FPGA module 4, an optical fiber laser vibrometer 5, a WIFI monitoring camera 6 and a glass cover 7, wherein the wireless control generation module 2 is assembled in the glass cover 7, the distance between the glass cover 7 and an animal to be detected is not greater than 30m, the system control end 1 is in wireless communication with the wireless control generation module 2, the wireless control generation module 2 is in wireless communication with the optical fiber laser vibrometer 5, an output end of the optical fiber laser vibrometer 5 is connected with an input end of the FPGA module 4, an output end of the FPGA module 4 is connected with the system control end 1, and a signal transmitting end of the WIFI monitoring camera 6 is connected with the system control end 1.
System control terminal 1: the device is used for the wireless control generation module 2 to send frequency and amplitude data of sound signals, and receive feedback signals returned by the wireless control generation module 2, and simultaneously observe the demodulated vibration waveform output by the fiber laser vibrometer 5.
Wherein: the wireless control generation module 2 is arranged in the glass cover 7 and emits sound signals corresponding to the frequency and amplitude data so as to cause the surface of the glass cover 7 to vibrate and transmit the vibration to the auditory system of animals; the wireless control generating module 2 sends a feedback signal to the system control terminal 1 to confirm the frequency and amplitude of the signal sent currently.
Referring to fig. 6, the remote sound field generating system 3 detects the frequency and power of the actual simulated sound in the area where the animal is located through an optical fiber sensor, and the modulated optical signal of the optical fiber sensor is perpendicularly incident to the surface of the glass cover 7 through a collimator and is reflected back to the collimator, so as to demodulate the vibration waveform of the surface of the glass cover 7 to reflect the frequency and power of the actual simulated sound in the area where the animal is located.
Wherein: the WIFI monitoring camera 6 is connected with the system control end 1 through WIFI and is used for observing the response of animals when the wireless control generation module 2 sends out the simulation sound with specific frequency and amplitude.
Wherein: the wireless control generation module 2 adopts a Bluetooth control generation module, the Bluetooth control generation module comprises a microprocessor, a power supply, a signal generator, a Bluetooth module, a singlechip, a passive buzzer, a primary filter, a primary amplifier, a DDS integrated chip and a D/A conversion integrated chip, wherein the singlechip adopts a chip U0 as a main chip, the model of the main chip U0 is STM32F, the DDS integrated chip adopts a chip U1, the model of the chip U1 is AD9834, the D/A conversion integrated chip adopts a chip U4, and the model of the chip U4 is AD5620; the Bluetooth module is electrically connected with the singlechip, the singlechip is electrically connected with the signal generator, the output end of the signal generator is electrically connected with the input end of the primary amplifier, the output end of the primary amplifier is electrically connected with the input end of the primary filter, and the output end of the primary filter is electrically connected with the input end of the passive buzzer; the single chip microcomputer is electrically connected with the microprocessor, and the microprocessor, the signal generator, the Bluetooth module, the single chip microcomputer and the passive buzzer are electrically connected with the power supply.
Referring to fig. 3-5, PA4 of the chip U0 is connected to D15 of the chip U1, PA5 of the chip U0 is connected to D14 of the chip U1, PA6 of the chip U0 is connected to D13 of the chip U1, PA7 of the chip U0 is connected to D11 of the chip U1, PB0 of the chip U0 is connected to D9 of the chip U1, PB1 of the chip U0 is connected to D10 of the chip U1, so that the DDS integrated chip is guaranteed to normally generate signals, and control of signal frequency is achieved; PB10 of the chip U0 is connected with RXD of the Bluetooth module, PB11 of the chip U0 is connected with TXD, information interaction between the system control end 1 and the sounding module is realized, PB12 of the singlechip is connected with D5 of the D/A conversion integrated chip, PB13 of the chip U0 is connected with D6 of the D/A conversion integrated chip, PB15 of the chip U0 is connected with D7 of the D/A conversion integrated chip, and the D/A conversion integrated chip is controlled to output a level with a specific amplitude, so that the amplitude of a signal is indirectly controlled; the other pins ensure the normal operation of the singlechip; d3 and D4 of the D/A conversion integrated chip are connected with D1 of the DDS integrated chip through a resistor RSET, and the D/A conversion integrated chip sends a level with a specific amplitude to the DDS integrated chip, so that the amplitude of an output sine wave is controlled; and D20 of the DDS integrated chip is connected with the positive electrode of the passive buzzer, and sine waves emitted by the DDS integrated chip trigger the passive buzzer to emit sound signals.
The Bluetooth remote control passive buzzer can emit sounds with different frequencies and powers, so that the Bluetooth remote control passive buzzer can be used as a weak sound generation system, and the Bluetooth control device can emit sound at a certain distance due to the fact that the environment needing to be sealed and sound-insulated is measured, so that the realization of system functions is facilitated. The DDS integrated chip is used for controlling the frequency of the sound signal, the DAC chip is used for indirectly controlling the amplitude of the sound signal, so that the frequency and the power of a sound production system, especially weak sound signals, are accurately regulated and controlled, and the DDS chip with a specific model can contain the audible sound frequency range of most animals; and the waveform frequency modulation gradient generated by the DDS chip is smaller, so that the requirement of accurately regulating and controlling the sound frequency can be met.
Because the sensitivity of the animal to a certain specific frequency sequence is higher, the singlechip can realize different mode control on the frequency by programming, and the specific frequency numerical value sequence is written into the singlechip, and comprises different sequences of gradual change from low to high, gradual change from high to low and frequency high-low jump; the system control terminal 1 sends three values to the bluetooth control sounding module each time, including a frequency generation mode selection value, a frequency value (if the mode selection mode is one, the sequence number corresponding to the corresponding frequency value sequence is selected), and an amplitude value. In the mode, the singlechip transmits a frequency numerical sequence to the DDS module, so that the DDS module generates waveforms with unchanged amplitude and frequency variation; in mode two, the DDS module generates a sine waveform with a fixed amplitude and a fixed frequency. By generating a waveform with frequency variation, an analog acoustic signal with a specific variation frequency is obtained, and the sensitivity of an animal to a certain frequency sequence and the lowest power acoustic signal perceived by the animal under the sequence can be observed.
The implementation of the DDS module takes an AD9834 chip as an example, and the AD9834 chip is internally provided with phase modulation and frequency modulation functions, so that the perception capability of animals on sound signals under different frequencies and volumes is researched; to modulate the amplitude of the output signal, a low power D/a conversion integrated chip is used to set the full scale current. The reference voltage of the D/a conversion integrated chip is a function of the internal reference voltage VREF and the external resistance RSET:wherein V is ref Is the internal reference voltage of the D/a conversion integrated chip, typically 1.2v, and the rset resistance typically 6.8k. The full scale current of the D/A conversion integrated chip is a multiple of the reference current, and the full scale current of the AD9834 is:
I FULLSCALE ＝18×(V ref /R set )
if FS ADJUST (D1) of the D/A conversion integrated chip is linked to a variable voltage, the full scale current is:
I FULLSCALE ＝18×(V ref -V DAC )/R set
change V DAC The full scale current can be changed, thereby changing the voltage output of the DDS integrated chip.
Referring to fig. 6, the remote sound field detection module operates as follows: the PGC internal modulation mode based on the FPGA has the characteristics of low cost, portability and stable performance; after the sound generating module controlled by Bluetooth sends out a weak sound signal, the sound signal is transmitted into the air, and the glass surface is vibrated after reaching the inner wall of the glass cover 7, and the remote sound field detection module can indirectly detect the frequency and amplitude of the sound signal by detecting the vibration condition of the surface of the glass cover 7; because the distance between the glass cover 7 and the animal is small enough, the attenuation of the sound signal transmitted to the animal ear is small, the frequency and the amplitude of the sound of the point where the animal is located can be approximately represented by the vibration of the surface of the glass cover 7, therefore, the vibration waveform of the glass surface can be represented by the signal waveform transmitted into the animal ear by using the optical fiber sensor, the remote sound detection can be realized by using the laser, and the problem caused by placing the sensing device beside the animal body is avoided.
The following is a system principle introduction: the laser source with narrow linewidth is output, the PZT ring is used for high-frequency phase modulation, and the angular frequency is omega c . The signal light is divided into two paths of signal light and reference light after passing through a 1X 2 coupler. The signal light enters the circulator from the port 1, then enters the collimator through the port 2, and vertically enters the collimator to be shot to the surface of the glass cover 7. The vibration signal of the passive buzzer is transmitted to the surface of the glass cover 7, which vibration signal causes a change in the optical phase due to the doppler effect of the laser, whereby the optical phase information coupled into the signal arm, denoted as disturbance signal p (t), is reflected back to the collimator. The signal light and the reference light continue to propagate, and then pass through the 2×2 coupler and are output through the 2 photodetectors PD. At this time, the form of the outputs of the two photodetectors can be expressed as:
wherein, the liquid crystal display device comprises a liquid crystal display device,the phase difference between the signal arm and the reference arm is A, B, which is a constant related to system parameters such as light source intensity, and includes:
wherein omega c For the angular frequency of the modulation, C is the modulation amplitude.
The output of the two photodetectors after passing through a subtracter is as follows:
after the signals pass through the photoelectric detector, the output is input into the FPGA through the ADC sampling chip to carry out signal processing in the digital domain. The part consists of the following modules: the device comprises a subtraction module, a mixing module, a differential cross multiplication module, an integration module and a high-pass filtering module; the following is the processing of the signals in the FPGA module 4 according to the PGC demodulation principle.
Firstly, dividing the output signal into two identical paths, and respectively using frequency omega generated by direct digital frequency synthesis in FPGA c And 2ω c Is mixed with the sinusoidal signal of (c). Two paths of orthogonal signals containing the low-frequency signals to be detected can be obtained after low-pass filtering:
V 1 ＝-BJ 1 (C)sin[p(t)]
V 2 ＝-BJ 2 (C)cos[p(t)]
wherein J is 1 (C) For Bessel function of order 1, J 2 (C) Is a Bessel function of order 1.
Two paths of orthogonal signals containing the low-frequency signals to be detected are subjected to Differential Cross Multiplication (DCM) operation, and the differentiated signals are as follows:
V 1 ′＝-BJ 1 (C)p′(t)cos[p(t)]
V 2 ′＝BJ 2 (C)p′(t)sin[p(t)]
and then cross multiplication operation is carried out, as follows:
V 1 ′V 2 ＝B 2 J 1 (C)J 2 (C)p′(t)cos 2 [p(t)]
V 2 ′V 1 ＝-B 2 J 1 (C)J 2 (C)p′(t)sin 2 [p(t)]
and performing differential operation to obtain:
V 1 ′V 2 -V 2 ′V 1 ＝B 2 J 1 (C)J 2 (C)p′(t)cos 2 [p(t)]+B 2 J 1 (C)J 2 (C)p′(t)sin 2 [p(t)]＝B 2 J 1 (C)J 2 (C) p' (t) integrates the resulting signal
∫(V 1 ′V 2 -V 2 ′V 1 )dt＝B 2 J 1 (C)J 2 (C)p′(t)＝B 2 J 1 (C)J 2 (C)p(t)
Its coefficient B 2 J 1 (C)J 2 (C) Can be made of V 1 ·V 2 And taking a peak value to obtain the final demodulation to obtain p (t). Because p (t) contains the direct current initial phase difference and some low-frequency influence of environmental noise, the signals after being filtered are output to the system control end 1 by a cable to observe the waveforms, and the magnitude order of the weak sound signals is obtained.
The Bluetooth control generation module has two working modes:
1. by emitting a sound signal of a specific frequency, amplitude.
2. And sending out a sound signal with specific amplitude and frequency as a change sequence so as to adapt to the hearing habit of the animal.
The working process of the Bluetooth control generation module is as follows:
the system control terminal 1 performs Bluetooth communication with the Bluetooth module, and the system control terminal 1 sends information comprising a working mode, a working frequency or a frequency sequence number and a working amplitude to the Bluetooth module, and the Bluetooth module sends the information to the singlechip after receiving the information; after the singlechip receives the information, on one hand, the information is converted into corresponding level, and the level is output to the signal generator module through a pin; after receiving the level, the pin of the signal generator outputs signals with corresponding frequency and amplitude; the signal output by the signal generator is output to the passive buzzer after passing through the primary amplifier and the primary filter; the passive buzzer is controlled by current and emits sound signals.
Wherein: the remote sound field generation system 3 detects the frequency and power of the actual simulated sound of the region where the animal is located through an optical fiber sensor, wherein the optical fiber sensor comprises a laser, a PZT ring, a Mach-Zehnder interferometer, a circulator, a collimator, a photoelectric detector and an FPGA module 4; the laser carries out high-frequency modulation through the PZT ring, and then the optical signals input into the Mach-Zehnder interferometer are divided into modulated optical signals and reference optical signals through the optical coupler, wherein the modulated optical signals are vertically incident to the surface of the glass cover 7 through the circulator and the collimator and reflected back to the collimator, the vibration signals are coupled into the optical signals through the Doppler effect, two paths of signals output from the Mach-Zehnder interferometer are output through the photoelectric detector, the two paths of electric signals are input into the FPGA module 4 after being differenced, and the signals sequentially pass through the subtracting module, the mixing module, the differential cross multiplication module, the integrating module and the high-pass filtering module.
Wherein: the weak signal generation in the wireless control generation module 2 is realized by a low-power-consumption direct digital frequency synthesis DDS chip and a low-power-consumption DAC, so that the precision of the weak signal is improved.
Referring to fig. 7, a method for evaluating and detecting the hearing of an animal comprises the following steps:
the first step: the method comprises the steps of placing a system control end 1, a wireless control generation module 2, a remote sound field generation system 3, an FPGA module 4, a fiber laser vibration meter 5, a WIFI monitoring camera 6 and a glass cover 7 in a quiet environment, placing a hardware circuit in the wireless control generation module 2 in the glass cover 7, and enabling the distance between an animal to be detected and the glass cover 7 to be no more than 30m;
and a second step of: a Bluetooth is used for connecting the system control end 1 and the remote sound field generation system 3 to remotely control the frequency generation mode and the frequency and the amplitude of the sound signal; firstly, suspending emitting of sound signals, keeping the environment quiet in a period of time, and monitoring the state of animals;
and a third step of: the system control terminal 1 transmits three values to the wireless control generation module 2 each time, wherein the three values comprise a frequency generation mode selection value, a frequency value and an amplitude value; in the mode, the singlechip transmits a frequency numerical sequence to the DDS module, so that the DDS module generates waveforms with unchanged amplitude and frequency variation; in the second mode, the DDS module generates sine waveforms with fixed amplitude and fixed frequency, so that the wireless control generation module 2 emits sound with specific frequency and amplitude;
fourth step: monitoring the state of the animal, and judging that the animal can hear weak sound if the animal has different reactions such as moving position, head raising, changing action, eyeball rotation and the like compared with the state of silence; simultaneously, the remote sound field generating system 3 is used for measuring the amplitude and the frequency of the sound signal of the position where the small animal is located and recording the amplitude and the frequency, and is used for quantifying the perception capability of the small animal on weak sound;
fifth step: repeating the step S3 and the step S4, and finding out the range of the sound signal which can be perceived by the animal;
sixth step: and screening experimental data obtained by detection to obtain a conclusion.
In summary, the device and the method for evaluating and detecting the hearing of the animal provided by the invention have the following advantages:
1. the sounding module is arranged in the glass cover 7, the glass cover 7 is arranged beside an animal to be detected, the vibration on the surface of the glass cover 7 represents the frequency and the amplitude of the sound of the point where the animal is positioned, and the vibration waveform on the surface of the glass is detected by the optical fiber sensor, so that high-precision sound detection is realized; meanwhile, the collimator is used for emitting modulated laser and receiving reflected light signals to detect the vibration of the glass surface, and the mode can realize remote sound detection, so that the problem caused by placing the sensing equipment beside an animal body is avoided.
2. The sound generating module sends out sound signals with specific frequency and amplitude in one mode, and sends out sound signals with specific amplitude and frequency in the other mode, so that the sound generating module can be more suitable for the hearing habit of animals.
3. The animal response monitoring module is added to monitor the response of the animal in the simulation of sound, and the combination of the video and the audio is beneficial to the evaluation of the hearing of the animal.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
1. The animal hearing evaluation detection device is characterized by comprising a system control end (1), a wireless control generation module (2), a remote sound field generation system (3), an FPGA module (4), an optical fiber laser vibration meter (5), a WIFI monitoring camera (6) and a glass cover (7), wherein the wireless control generation module (2) is assembled in the glass cover (7), the system control end (1) is in wireless communication with the wireless control generation module (2), the wireless control generation module (2) is in wireless communication with the optical fiber laser vibration meter (5), the output end of the optical fiber laser vibration meter (5) is connected with the input end of the FPGA module (4), the output end of the FPGA module (4) is connected with the system control end (1), and the signal transmission end of the WIFI monitoring camera (6) is connected with the system control end (1);
system control terminal (1): the device comprises a wireless control generation module (2), a fiber laser vibration meter (5) and a wireless control generation module (2), wherein the wireless control generation module is used for transmitting frequency and amplitude data of sound signals, receiving feedback signals returned by the wireless control generation module (2) and observing demodulated vibration waveforms output by the fiber laser vibration meter (5);
the wireless control generation module (2) is arranged in the glass cover (7) and emits sound signals corresponding to the frequency and amplitude data so as to cause the surface of the glass cover (7) to vibrate and transmit the vibration to the auditory system of animals; the wireless control generation module (2) sends a feedback signal to the system control end (1) to confirm the frequency and amplitude of the currently sent signal;
the remote sound field generation system (3) detects the frequency and the power of the actual simulated sound of the region where the animal is located through the optical fiber sensor, and the modulated optical signal of the optical fiber sensor is vertically incident to the surface of the glass cover (7) through the collimator and is reflected back to the collimator, so that the vibration waveform of the surface of the glass cover (7) is demodulated to reflect the frequency and the power of the actual simulated sound of the region where the animal is located.
2. An animal hearing assessment testing apparatus as in claim 1, wherein: the WIFI monitoring camera (6) is connected with the system control end (1) through WIFI and used for observing the response of animals when the wireless control generation module (2) sends out simulated sound with specific frequency and amplitude.
3. An animal hearing assessment testing apparatus as in claim 1, wherein: the distance between the glass cover (7) and the animal to be tested is not more than 30m.
4. An animal hearing assessment testing apparatus as in claim 1, wherein: the wireless control generation module (2) adopts a Bluetooth control generation module, the Bluetooth control generation module comprises a microprocessor, a power supply, a signal generator, a Bluetooth module, a singlechip, a passive buzzer, a primary filter, a primary amplifier, a DDS integrated chip and a D/A conversion integrated chip, wherein the singlechip adopts a chip U0 as a main chip, the model of the main chip U0 is STM32F, the DDS integrated chip adopts a chip U1, the model of the chip U1 is AD9834, the D/A conversion integrated chip adopts a chip U4, and the model of the chip U4 is AD5620; the Bluetooth module is electrically connected with the singlechip, the singlechip is electrically connected with the signal generator, the output end of the signal generator is electrically connected with the input end of the primary amplifier, the output end of the primary amplifier is electrically connected with the input end of the primary filter, and the output end of the primary filter is electrically connected with the input end of the passive buzzer; the single chip microcomputer is electrically connected with the microprocessor, and the microprocessor, the signal generator, the Bluetooth module, the single chip microcomputer and the passive buzzer are electrically connected with the power supply.
5. An animal hearing assessment testing apparatus as in claim 1, wherein: the remote sound field generation system (3) detects the frequency and power of the actual simulated sound of the region where the animal is located through an optical fiber sensor, wherein the optical fiber sensor comprises a laser, a PZT ring, a Mach-Zehnder interferometer, a circulator, a collimator, a photoelectric detector and an FPGA module (4); the laser carries out high-frequency modulation through the PZT ring, and then the optical signals input into the Mach-Zehnder interferometer are divided into modulated optical signals and reference optical signals through the optical coupler, wherein the modulated optical signals are vertically incident to the surface of the glass cover (7) through the circulator and the collimator and reflected back to the collimator, the vibration signals are coupled into the optical signals through the Doppler effect, two paths of signals output from the Mach-Zehnder interferometer output electric signals through the photoelectric detector, the two paths of electric signals are input into the FPGA module (4) after being subjected to difference, and the signals sequentially pass through the subtracting module, the mixing module, the differential cross multiplying module, the integrating module and the high-pass filtering module.
6. An animal hearing assessment testing apparatus as in claim 1, wherein: the weak signal generation in the wireless control generation module (2) is realized by a low-power-consumption direct digital frequency synthesis DDS chip and a low-power-consumption DAC.
7. A method of auditory evaluation detection of an animal comprising the steps of:
s1: placing a system control end (1), a wireless control generation module (2), a remote sound field generation system (3), an FPGA module (4), an optical fiber laser vibration meter (5), a WIFI monitoring camera (6) and a glass cover (7) in a quiet environment, placing a hardware circuit in the wireless control generation module (2) in the glass cover (7), and enabling the distance of an animal to be detected from the glass cover (7) to be no more than 30m;
s2: a Bluetooth is used for connecting a system control end (1) and a remote sound field generation system (3) so as to remotely control a frequency generation mode and the frequency and the amplitude of a sound signal; firstly, suspending emitting of sound signals, keeping the environment quiet in a period of time, and monitoring the state of animals;
s3: the system control end (1) sends three values to the wireless control generation module (2) each time, wherein the three values comprise a frequency generation mode selection value, a frequency value and an amplitude value; in the mode, the singlechip transmits a frequency numerical sequence to the DDS module, so that the DDS module generates waveforms with unchanged amplitude and frequency variation; in the second mode, the DDS module generates sine waveforms with fixed amplitude and fixed frequency, so that the wireless control generation module (2) emits sound with specific frequency and amplitude;
s4: the method comprises the steps of monitoring the state of an animal, judging that the animal can hear weak sound if the animal has different reactions in moving positions, head raising, changing actions, eye rotation and resting states, measuring the amplitude and the frequency of a sound signal of the position where a small animal is located by using a remote sound field generating system (3), and recording the amplitude and the frequency for quantifying the perception capability of the small animal on the weak sound;
s5: repeating the step S3 and the step S4, and finding out the range of the sound signal which can be perceived by the animal;
s6: and screening experimental data obtained by detection to obtain a conclusion.
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