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関連する概念動画

Sound Waves01:01

Sound Waves

9.3K
Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well....
9.3K
Perception of Sound Waves01:01

Perception of Sound Waves

4.5K
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...
4.5K
Sound as Pressure Waves01:17

Sound as Pressure Waves

2.5K
Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
2.5K
Standing Waves01:17

Standing Waves

4.5K
Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
4.5K
Sound Waves: Resonance01:14

Sound Waves: Resonance

2.6K
Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
2.6K
Hair Cells01:22

Hair Cells

40.9K
Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
40.9K

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関連する実験動画

Updated: Aug 8, 2025

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
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Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

Published on: February 3, 2014

8.5K

海の中の声

Andrea Ravignani1,2, Christian T Herbst3,4,5

  • 1Comparative Bioacoustics Group, Max Planck Institute for Psycholinguistics, Nijmegen, Netherlands.

Science (New York, N.Y.)
|March 2, 2023
PubMed
まとめ
この要約は機械生成です。

歯のあるクジラは以前から知られている 海洋哺乳類や陸上の脊椎動物とは異なる 音の生成メカニズムを開発しました この発見は 歯のあるクジラにおける 発声の第三の進化の経路を示しています

さらに関連する動画

Author Spotlight: Investigating the Impact of Emotional Prosodies on Voice Recognition and Perception
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Author Spotlight: Investigating the Impact of Emotional Prosodies on Voice Recognition and Perception

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Synthetic, Multi-Layer, Self-Oscillating Vocal Fold Model Fabrication
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Synthetic, Multi-Layer, Self-Oscillating Vocal Fold Model Fabrication

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関連する実験動画

Last Updated: Aug 8, 2025

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
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Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

Published on: February 3, 2014

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Author Spotlight: Investigating the Impact of Emotional Prosodies on Voice Recognition and Perception
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Synthetic, Multi-Layer, Self-Oscillating Vocal Fold Model Fabrication
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Synthetic, Multi-Layer, Self-Oscillating Vocal Fold Model Fabrication

Published on: December 2, 2011

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科学分野:

  • 海洋生物学
  • バイオアコースティック
  • 進化生物学

背景:

  • 歯のあるクジラ (オドントセト) は 音響とコミュニケーションのために 複雑な音を出す.
  • 現存する知識は,哺乳類における2つの主要な音源メカニズムである喉音源 (陸上の哺乳類) と音源唇 (イルカ) を特定している.
  • 歯のあるクジラ の 種 の 中 で 音 の 生成 の 正確 な 仕組み は まだ 完全 に 理解 さ れ て い ませ ん.

研究 の 目的:

  • 歯のあるクジラにおける 独特の音の発生メカニズムを 研究するためです
  • 発声に伴う解剖学的構造と生理学的プロセスを特定する.
  • このメカニズムを他の脊椎動物で知られている音の生成方法と比較する.

主な方法:

  • 高解像度画像技術 (例えばCTスキャン,MRI) を用いて声器を視覚化しました.
  • 録音された音に水力学と音学分析が行われました.
  • 比較解剖学的研究が関連種で実施された.

主要な成果:

  • 喉の音声と音声の唇とは異なる新しい音声生成メカニズムが 歯のあるクジラで特定されました
  • この第三の経路は 鼻経路内の特殊な構造を伴うものです
  • 生成される音の音響特性は独特で,他の既知のメカニズムによって生成されるものとは異なります.

結論:

  • 歯のあるクジラには 音を発する第三の 独立した進化の経路があります
  • この発見により 哺乳類の声の進化に関する理解が 広がりました
  • この独特なメカニズムは 歯のあるクジラの 適応放射線と多様性を強調しています