Bird repelling method based on specific sound frequency and combination thereof

Abstract

The invention relates to a bird repelling method based on specific sound frequencies and combination thereof. The core of the bird repelling method is that various birds are widely repelled by playing sound signals with specific frequency spectrum characteristics. The sound signals can be played by any sound playing device without customized adjustment for specific bird types, and the method has wide applicability. The core of the method lies in the frequency spectrum characteristic design of sound signals, the frequency range of the sound signals covers 0-20000 Hz, and multiple combination modes such as single frequency, frequency span and frequency fluctuation are included, so that uncommon sounds in the nature are simulated or strong auditory stimulation is generated, discomfort or alertness of birds is caused, and the repelling effect is achieved. Besides, the volume, the playing duration, the playing interval and the playing mode of the sound signal can be flexibly adjusted according to the specific environment, the bird species or the seasonal change, so that the repelling efficiency and flexibility are further improved.

Description

Technical Field

[0001] The invention relates to a method for driving away birds, and in particular to a bird-driving technology based on a specific sound frequency and a combination design, which can be used to drive away birds according to the characteristics of one or more birds. Background Art

[0002] The relationship between humans, nature and wildlife is often discussed by the public. Birds, as one of the animals with the closest relationship with humans, play an indispensable role in the ecosystem. As an important link in the food chain, they not only prey on pests and maintain ecological balance, but also help spread seeds and pollen through migration and other behaviors, promoting the reproduction and spread of plants. However, birds are often considered pests in the agricultural and industrial fields. Not only can they cause serious damage to crops, resulting in reduced yields, but they can also cause damage to industrial facilities and public places. For example, birds will peck at ripe fruits and grains, causing economic losses to farmers; they will also build nests on buildings, airports and power facilities, increasing maintenance costs and safety hazards. In addition, the acidic components in bird excrement may corrode building materials and mechanical equipment, further increasing the difficulty and cost of maintenance.

[0003] Traditional bird repellent methods mainly include physical bird repellent, chemical bird repellent and biological bird repellent. However, each of these methods has its limitations. Physical bird repellent methods, such as installing bird-proof nets and using reflective tapes, although effective in the short term, are not effective in the long term in repelling birds, and have high installation and maintenance costs. Chemical bird repellent methods, such as the use of bird repellents, although effective in repelling birds, may have adverse effects on the environment and non-target organisms. Biological bird repellent methods, such as introducing natural enemy birds, although eco-friendly, are difficult to control and implement in actual applications.

[0004] As an emerging bird-repelling technology, sound bird repelling has been widely used. The sound bird repelling method uses the sensitivity of birds to sounds of specific frequencies and tones. By playing sounds with repelling effects, birds feel uncomfortable or dangerous, so that they spontaneously leave a specific area. This method has the advantages of being environmentally friendly, harmless and relatively economical. Summary of the invention

[0005] The present invention relates to an efficient and flexible bird-repelling method, which aims to effectively repel various birds by playing sound signals with specific spectral characteristics, thereby reducing damage and potential safety hazards to crops, airports, power facilities and other places. The core of this method is to use the different frequency characteristics of sound signals to create a sound environment with a strong bird-repelling effect, and it can achieve wide applicability without customized adjustments for specific bird species.

[0006] Specifically, the method of the present invention includes the following key steps and features.

[0007] Set and play a sound signal with specific spectral characteristics: First, a series of sound signals with specific spectral characteristics are designed and generated. These signals cover the human audible range (0-20000Hz) and cleverly utilize the sensitivity of birds to sound frequencies. By playing them through any sound playback device (such as speakers, amplifiers, etc.), an effective repelling sound field can be formed in the target area.

[0008] Diverse frequency characteristics combination: a. Single frequency: The sound signal contains at least one single frequency component in the range of 0-20000Hz, including but not limited to 200Hz, 6400Hz, 12800Hz, etc. These specific frequencies can directly trigger the birds' auditory discomfort or alert response, thereby achieving a repelling effect. b. Frequency span: During the playback of the sound signal, its frequency changes dynamically within the range of 0-20000Hz, simulating the uncommon sound patterns in nature. This includes but is not limited to gradually increasing from a low frequency of 200Hz to a high frequency of 12800Hz, or freely changing between any two points within this range. This change makes the sound signal more difficult to predict and adapt, and enhances the repelling effect. c. Frequency Fluctuation: The sound signal undergoes rapid and frequent frequency fluctuations within the range of 0-20,000 Hz, including but not limited to rapid switching or periodic fluctuations between 200 Hz and 12,800 Hz. This rapidly changing frequency characteristic can produce strong auditory stimulation, making the birds extremely uneasy and quickly fleeing the area.

[0008] Selection and configuration of playback equipment: In order to ensure that the sound signal can be accurately and stably transmitted to the target area, the present invention carefully selects and configures the playback device. Any device that can play audio signals can be used for this purpose, such as speakers, amplifiers, tweeters, etc. According to actual needs, these devices can be installed in areas where birds frequently move, such as the edge of farmland, around airport runways, under power lines, etc.

[0009] Flexible playback parameter adjustment: In order to further improve the pertinence and adaptability of the driving away, the present invention also provides a variety of adjustment options for playing parameters, including volume, playing time, playing interval, playing mode, etc. a. Volume adjustment: The volume of the sound signal can be flexibly adjusted according to the noise level in the target area and the hearing sensitivity of the birds. In a noisy environment, the volume should be appropriately increased to ensure the repelling effect; In areas where quietness is required, lower the volume to reduce disturbance to the surrounding environment. b. Playing duration and interval: Different playing duration and interval can be set according to the activity patterns of birds and the need to drive them away. For example, the playing duration and frequency can be increased during the peak period of bird activity; the playing frequency can be reduced during the period of low bird activity to save energy. c. Play mode: Provides multiple modes such as continuous play, intermittent play and random play for users to choose. Continuous play mode is suitable for scenes that require continuous expulsion; intermittent play mode can reduce energy consumption while maintaining the expulsion effect; random play mode further enhances the expulsion effect through unpredictable sound changes.

[0010] The beneficial effects of the present invention are as follows: the bird-repelling method of the present invention not only has an efficient repelling effect, but also fully considers environmental adaptability and eco-friendliness. By adjusting the frequency characteristics and playback parameters of the sound signal, the effective repelling of birds can be achieved without affecting the surrounding ecological environment and biodiversity. At the same time, the method does not require the use of chemical agents or physical barriers that may pollute or damage the environment, and is a green and environmentally friendly bird-repelling solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Spectrogram of four sound types

[0012] Group A is a continuous single frequency, and groups A1, A2, and A3 are low frequency (200 Hz), medium frequency (6400 Hz), and high frequency (12800 Hz), respectively.

[0013] Group B, this audio is used to verify the impact of frequency span. The three groups B1, B2, and B3 are 200 and 6400 Hz, 6400 and 12800 Hz, and 200 and 12800 Hz, which are played alternately, and the frequency changes every 5 seconds.

[0014] In group C, the audio fluctuates within a range. The three groups C1, C2 and C3 are 200-6400hz, 6400-12800hz and 200-12800hz respectively. In each range, 5 frequencies from low to high will be selected and played for 1 / 6 second respectively.

[0015] Group D, the audio fluctuates within a range. The three groups D1, D2, and D3 are 200-6400hz, 6400-12800hz, and 200-12800hz respectively. However, each audio is played for 1 second, and every 5 seconds is a combination length. After playing for 5 seconds, there will be a 10-second interval before looping.

[0016] Figure 2 Effects of different sound types on escape time, escape distance, and escape speed DETAILED DESCRIPTION

[0017] The present invention is described in detail below by way of examples.

[0018] When the present invention is used specifically, taking Daxiandang, Wuzhai Township, Yongshan County, Zhaotong City, northeastern Yunnan Province, China as an example, according to the survey record data, a total of 4 groups of sound types are designed this time ( Figure 1 ) to verify the effectiveness of the present invention.

[0019] The observation area is selected from the area where the black-necked cranes have been active for a long time (farmland, wetland), and the observation objects are mainly the cranes that are foraging. The device for playing audio is an ordinary portable loudspeaker. Based on previous observations, the area where the cranes will forage is inferred, and the playback device is placed in the area before the cranes enter the foraging area. In the process of placing the playback device, try to choose a hidden route to avoid the field of vision of the black-necked cranes. Start playing after the black-necked cranes have stably foraged. Start playing the sound when the black-necked crane is within 10 meters of the speaker. Each time it is played for 1 minute. The interval between two experiments is at least 30 minutes, and several experimental combinations are carried out alternately.

[0020] Before the sound starts playing, the type of sound played, time, group type, number of adults and juveniles are recorded. The experiment was conducted in an area frequently used by black-necked cranes. After the sound is played, the adult and juvenile characteristics of the objects, all behaviors and events from the moment the audio is played to the end of the audio, and the escape distance are observed. Based on the field observation of black-necked cranes and combined with literature, the behavioral responses of black-necked cranes are divided into 6 types, namely flying, walking, jumping, flapping wings, alerting, and foraging. The behavioral response time refers to the time interval required from perception to execution of a certain behavior. The escape distance is defined as movement when ① the habitat changes; ② the moving distance without other behaviors in the middle exceeds 30m; ③ there is flying behavior. The new position is defined as the position where the black-necked crane ends the movement and starts another behavior, such as starting to forage. The escape distance is defined as the straight-line distance between the black-necked crane moving from the original position to the new position. When the black-necked crane crosses the ridge, the escape distance is defined as the distance between the last position leaving the field of vision and the original position.

[0021] In this experiment, behavioral response, behavioral response time, and escape distance were used as evaluation indicators of audio effects. According to the intensity of the response, flight, walking, jumping, flapping wings, vigilance, and foraging were assigned 10, 7, 5, 5, 3, and 0 points, respectively, with the highest score observed. In order to analyze the response of black-necked cranes to different sounds, the Kruskal-Wallis test was used to analyze whether there were significant differences in the behavioral assignment, reaction time, and escape distance of black-necked cranes. In order to analyze the differences between adult cranes and young cranes, family groups, and clusters in response to different sounds, the Wilcoxon rank sum test was used to test their significant differences in behavioral assignment, escape distance, and escape speed. At the same time, the least significant difference (LSD) method was used for multiple comparisons. The escape speed is equal to the ratio of distance to time. All statistical analyses were analyzed using R-4.4.3 software.

[0022] The experimental results are as follows Figure 2 The results show that: ① Sounds with different frequencies cause black-necked cranes to behave differently ( Figure 2 a). Among the 12 sounds, A3, B3, C3, and D3 with the highest frequencies had the strongest behavioral responses, followed by D2. The behavioral responses of the seven sound types A1, A2, B1, B2, C1, C2, and D1 were not very obvious and were at a low level. In the significant difference analysis, the results showed that there were significant differences between A1, B2, and C1, and there were also significant differences between B3 and C1. There were no significant differences between the other groups. ② Sounds with different frequencies caused the black-necked cranes to escape at different distances ( Figure 2 b). A3 and C3 performed well in the escape distance, and there were significant differences with A1, B1, C1, D1, A2, B2, C2, D2, and B3. However, from the overall situation, the C sound type still performed the best. ③ Different audio frequencies make the black-necked crane escape at different speeds ( Figure 2 c) The two sound types A3 and D3 show significant differences in evasion speed from the other 10 sound types. Moreover, these two sound types have the fastest evasion speed, followed by C3, C2, and B3.

[0023] The results showed that high-frequency or high-fluctuation sounds could significantly repel black-necked cranes and effectively reduce their return time.

[0024] After using the present invention in Daxiandang, Wuzhai Township, Yongshan County, Zhaotong City, northeastern Yunnan Province, China, before using the present invention, black-necked cranes caused damage to farmland in winter and early spring. After using the present invention, the damage caused by black-necked cranes to farmland was reduced, which can be specifically manifested as black-necked cranes staying away from the experimental area, with an effective driving distance of up to 3,000 meters and an effective escape time of up to 2 hours. Therefore, this bird-repelling method has a significant effect on expelling black-necked cranes.

[0025] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for driving away birds, characterized in that: include: A sound signal with specific spectral characteristics is set and played to effectively drive away various birds; wherein the sound signal with specific spectral characteristics can be played through any sound playing device, and a wide range of driving away effects can be achieved without customized adjustment for specific bird species.

2. The bird-repelling method according to claim 1, wherein the frequency range of the sound signal covers 0-20000 Hz, specifically including a combination of one or more of the following frequency characteristics: a. Single frequency: The sound signal contains at least one single frequency component in the range of 0-20000 Hz, including but not limited to 200 Hz, 6400 Hz, and 12800 Hz. The single frequency component is sufficient to cause discomfort or alertness to the birds, thereby achieving a driving effect. b. Frequency span: During the playback process, the frequency of the sound signal varies within the range of 0-20000 Hz, including but not limited to gradually changing from 200 Hz to 12800 Hz, or changing between any two points within this range. Through continuous or intermittent changes in frequency, uncommon sounds in nature are simulated to drive away birds. c. Frequency Fluctuation: The sound signal undergoes rapid and frequent frequency fluctuations within the range of 0-20,000 Hz, including but not limited to rapid switching or periodic fluctuations between 200 Hz and 12,800 Hz. This rapidly changing frequency characteristic can produce strong auditory stimulation, making the birds feel uneasy, thereby achieving the purpose of driving them away.

3. The bird-repelling method according to claim 1 or 2, further comprising: The volume, play duration, play interval and play mode (such as continuous play, intermittent play or random play mode) of the sound signal are adjusted to adapt to the driving needs of different environments, different bird species or different seasons, thereby improving the driving efficiency and flexibility.

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