What is the way sound is generated? What is the production of sound?

Sound is an energy wave, which exists in a medium, and the vibration of an object produces this wave, and some of it can be recognized by the human ear, so it is sound.

Vibrations, such as human voices, are produced by the vibrations of the vocal cords.

Sound is produced by the vibration of an object.

Everything that is making sound is vibrating, and the object that is vibrating is not necessarily making sound. When an object vibrates and makes a sound, so does the sound, but the sound does not necessarily stop.

Sound travels in the medium in the form of sound waves to the surroundings. The substance that transmits sound is called a medium. The propagation of sound is inseparable from the medium. Note that solids, liquids, and gases can all transmit sound, but vacuum cannot transmit sound.

The speed at which sound travels

The distance that sound travels in a second is called the speed of sound, and the magnitude of the speed of sound is related to the type of medium. In general, sound travels fastest in solids, followed by liquids, and slowest in gases. The magnitude of the speed of sound is also related to temperature. In 15 m of air, the speed of sound is 340m s.

Taking advantage of the different velocities of sound propagation in different media, combined with formulas, it is possible to measure the distance using echoes or to measure the speed of sound propagation in air and the length of metal objects.

When measuring distance with echo, it is important to note that the time of receiving echo is the time of round trip, so when calculating with the formula s=vt, t should be half of the time given by the question.

A vibrating object can cause neighboring air molecules to vibrate, which in turn cause their neighboring air molecules to vibrate, thus producing sound, which is transmitted in the form of sound waves, and this transmission process is called sound radiation. Sound waves exist only in the medium around the sound source, and there can be no sound waves in a space without air. Sound can be transmitted not only in the air, but also in objects such as water, earth, and metal.

The speed of sound propagation in the air is 340 m s (15 hours).

Whenever the temperature changes1, its velocity also increases or decreases; At 0, its speed is per second.

The three elements of sound – loudness.

Loudness, also known as sound intensity or volume, indicates the intensity of sound energy, which mainly depends on the amplitude of the sound wave.

Loudness is the basis of hearing.

The audible vocal range is between 20Hz and 20000Hz; The sound pressure can be felt in the range of 0 dB to 120 dB.

The three elements of sound – tone.

Pitch, also known as pitch, represents the subjective perception of the human ear about the pitch of a sound. Objectively, the pitch mainly depends on the level of the fundamental frequency of the sound wave, the higher the frequency is the higher the pitch, and vice versa, the unit is expressed in hertz (Hz).

According to the actual perception of the pitch by the human ear, the frequency range of the human voice can be relaxed to 80Hz--12kHz, the music tone is wider, and the effect sound is wider.

The three elements of sound - timbre.

Timbre is also known as sound. The most audible sound produced by the fundamental frequency of the sound waveform is called the fundamental tone, and the sound produced by the small vibrations of each harmonic is called the overtone. Tones of a single frequency are called pure tones, and tones with harmonics are called polyphonics.

The goal of Hi-Fi audio is to transmit and restore all the characteristics of the original sound field as accurately as possible, so that people can actually feel the stereo surround sound effects of various on-site listening sensations, such as the sense of sound source positioning, the sense of space envelopment, and the sense of layer thickness.

Sound is produced by the vibration of an object, and the object that is emitting sound is called the sound source.

Sound is simply the movement of pressure waves through the air. Pressure waves vibrate the small bones of the inner ear, and these vibrations are converted into tiny electronic brain waves, which are the sounds we perceive. The inner ear works on the same principle as a microphone captures sound waves or a speaker's articulation, which is the relationship between a moving mechanical part and air pressure waves.

Naturally, when the sound wave is pitched low, moving slowly, and loud enough, we can actually "feel" the air pressure wave vibrating the body. So we perceive sound with the mixed parts of the body.

Sound is produced by vibrations.

When you speak, you cause the air to vibrate, and the vibrations travel out, and as soon as someone's ears receive this vibration, he will hear you. Sound can travel in solids, liquids, or through air or other gases.

As the sound travels, the molecules in the air are squeezed together, then separated, then squeezed, and then separated, and so on, and so on, and sound waves are generated. The sound can be high-pitched or low-pitched.

The pitch depends on the frequency of the sound (the number of vibrations per second). The strength of the sound depends on the amount of vibration that produces the sound. If the vibration is large, the sound will be strong; The vibration is small and the sound is weak. The magnitude of sound is measured in decibels.

Characteristics of sound

1. Loudness

The magnitude of the sound (commonly known as the volume) that the person subjectively perceives is determined by the "amplitude" and the distance between the person and the sound source, the greater the amplitude, the louder the louder, and the smaller the distance between the person and the sound source, the louder the louder.

2. Tone

The high and low of the sound (treble, bass) is determined by the "frequency", the higher the frequency, the higher the pitch (frequency unit Hz (hertz), hertz, the hearing range of the human ear is called infrasound below, and above 20,000 Hz is called ultrasound), for example, the sound of the low end or higher sounds, such as thin strings.

3. Frequency

Frequency is the number of sound waves passing through a given point per second, and it is measured in hertz, named after Heinrich Rudolf Hertz. This person sets up a table and demonstrates how the frequency relates to the period per second.

4. Timbre

Also known as a fret, the waveform determines the timbre of the sound. Sound varies according to the characteristics of the material of the object, and the timbre itself is an abstract thing, but the waveform is an intuitive expression of this abstraction. The waveform is different, and the timbre is different. The different timbres can be completely distinguished by the waveform.

Here's how the sound is produced:

Sound is a sound wave produced by the vibration of an object. It is a wave phenomenon that propagates through a medium (air or solid, liquid) and can be perceived by the auditory organs of humans or animals. An object that initially emits vibrations (vibrations) is called a sound source.

Sound travels in the form of waves that vibrate (vibrate). Sound is the motion formed by the propagation of sound waves through any medium.

Sound is a wave. Sounds that can be recognized by the human ear (frequencies between 20 Hz and 20000 Hz) are called sounds.

In physics, sound is generated by the vibration of an object, and the object that is emitting sound is called the sound source. The number of times an object vibrates in a second is called frequency, and the unit is hertz, the letter Hz. The human ear can hear the sound of 20 20000 Hz, and the most sensitive is the sound between 200 and 800 Hz.

The propagation speed of sound in different media is generally solid, liquid and gas (exceptions: cork 500m s, less than kerosene (25), distilled water (25), etc.), and the propagation speed of sound is related to the type of medium and the temperature of the medium.

Sound is a pressure wave: when playing a musical instrument, slapping a door, or knocking on a tabletop, their vibration causes the medium-air molecules to vibrate rhythmically, causing the surrounding air to produce dense changes, forming dense longitudinal waves, which produce sound waves, and this phenomenon will continue until the vibration disappears.

As a kind of wave, frequency and amplitude have become important properties to describe the wave, the magnitude of the frequency corresponds to what we usually call pitch, and the amplitude affects the magnitude of the sound. Sound can be broken down into superpositions of sine waves of different frequencies and intensities. This process of transformation (or decomposition) is called a fourier transform.

Sound is intimately linked to our daily lives, and all our actions depend on sound. So how does sound come about? Let's find out.

How sound is produced

All kinds of sounds in the air, whatever form they take, are caused by the vibrations of objects. The object that is making a sound is called the sound source. Sound travels in the form of sound waves.

Sound is simply the motion formed by the propagation of sound waves through solids or liquids, gases. Sound waves vibrate the ossicles of the inner ear, and these vibrations are converted into tiny electronic brain waves, which are the sounds we perceive.

The essence of sound

The essence of sound is fluctuations. When the vibration frequency is 20-20000Hz, the sensation produced by acting on the eardrum is called sound. The sound source can be a solid or fluid (liquid and gaseous) vibration.

The media medium of sound is air, water and solid, which are called air sound, water sound and solid sound respectively.

In general, sound is produced by the vibration of an object, and the object that is emitting sound is called the sound source. Sound travels in the form of sound waves. Do you understand?