共同的声音:时间频率作为Delphinus delphis产生的脉冲声音的分类参数
Bruna Pagliani1, Thiago O S Amorim1, Franciele R de Castro1
1Laboratório de Ecologia Comportamental e Bioacústica, Departamento De Zoologia, Instituto De Ciências Biológicas, Universidade Federal de Juiz de Fora, Juiz de Fora, Brazil.
Behavioural processes
|August 22, 2024
概括
海豚脉冲的声音,包括回声定位点击和爆发的声音,使用时间频率分析进行了分类. 时间参数被证明是最准确的区分这些海豚声调.
科学领域:
- 海洋生物学 海洋生物学
- 生物声学是一种生物声学.
- 动物沟通 动物沟通
背景情况:
- 海豚的发声包括音调 (哨声) 和脉冲声音 (回声定位点击,爆发声音).
- 声定位对于猎物检测和环境识别至关重要,在捕获猎物期间,点击间隔会发生变化.
- 爆发式脉冲声音与社会沟通有关,但它们的多样性尚未得到充分理解.
研究的目的:
- 为了对短嘴海豚 (Delphinus delphis) 产生的脉冲声音进行分类.
- 用聚类和歧视分析分析脉冲声音的时间频率特征.
- 确定对分类海豚脉冲声音最有效的参数.
主要方法:
- 在南大西洋西部,分析了来自短嘴海豚的64条点击列车.
- 时间,频率和联合时间频率参数的比较,使用k-means集群.
- 使用随机森林分析验证集群以评估分类准确性.
主要成果:
- 在所有分析类型中,K-means集群确定了所有脉冲声音的四个不同的集群.
- 时间参数在区分声音类型方面表现出最高的准确性 (Dim1 = 70.2%,Dim2 = 17.2%).
- 随机森林分析证实,时间频率数据集在Delphinus delphis中产生脉冲声音的最佳分类准确度 (84.6%).
结论:
- 时间频率分析有效地分类了Delphinus delphis中的脉冲声音,突出了它们的声学特征.
- 特定的声学参数对于定义这种身份和优化声音生产能源成本至关重要.
- 这项研究有助于了解海豚脉冲发声的复杂性和功能.
相关概念视频
01:20Discrete-Time Fourier Series
240
The Discrete-Time Fourier Series (DTFS) is a fundamental concept in signal processing, serving as the discrete-time counterpart to the continuous-time Fourier series. It allows for the representation and analysis of discrete-time periodic signals in terms of their frequency components. Unlike its continuous counterpart, which utilizes integrals, the calculation of DTFS expansion coefficients involves summations due to the discrete nature of the signal.
For a discrete-time periodic signal x[n]...
For a discrete-time periodic signal x[n]...
240
01:17NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
779
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
779
01:15Discrete Fourier Transform
232
The Discrete Fourier Transform (DFT) is a fundamental tool in signal processing, extending the discrete-time Fourier transform by evaluating discrete signals at uniformly spaced frequency intervals. This transformation converts a finite sequence of time-domain samples into frequency components, each representing complex sinusoids ordered by frequency. The DFT translates these sequences into the frequency domain, effectively indicating the magnitude and phase of each frequency component present...
232
01:09Beats
518
The study of music provides many examples of the superposition of waves and the constructive and destructive interference that occurs. Very few examples of music being performed consist of a single source playing a single frequency for an extended period of time. A single frequency of sound for an extended period might be monotonous to the point of irritation, similar to the unwanted drone of an aircraft engine or a loud fan. Music is pleasant and exciting due to mixing the changing frequencies...
518
01:06Echo
498
The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
498
01:01Perception of Sound Waves
4.4K
The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
4.4K