How do you think sound is produced?

It's still very exciting in this.

Sound is a sound wave produced by the vibration of an object.

Sound is a kind of pressure wave, when playing a musical instrument, slapping a door or knocking on the tabletop, the vibration will cause the medium-air molecules to vibrate rhythmically, causing the surrounding air to produce dense changes, forming sparse and dense longitudinal waves, resulting in sound waves.

A fluctuating phenomenon in which sound travels 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 is a wave, and the sound with a frequency between 20 Hz and 20 kHz can be recognized by the human ear.

Characteristics of sound.

1. Timbre. Sound has different properties due to the characteristics of different objects and materials, and timbre itself is an abstract thing, but the waveform is an intuitive expression of this abstraction. The timbre is different, and the waveform is different. The different timbres can be completely distinguished by the waveform.

2. 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.

3. 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.

Sound is produced by the vibration of an object. 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.

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.

The number of times an object vibrates in a second is called frequency and is measured in hertz (Hz). The more vibrations per second and the higher the frequency, the sharper or more pitched the sound is heard by the human ear. The human ear is not perceptible to vibrations at all frequencies.

Generally speaking, the human ear can only hear sound with a frequency of 20 20000Hz, and the sound in this frequency range is usually called audio sound. The sound below 20Hz is called infrasound, and the sound above 20000Hz is called ultrasound. Neither infrasound nor ultrasound can be heard by the human ear, but there are some animals that can hear it, such as mice that can hear infrasound and bats that can feel ultrasound.

Ultrasonic is a kind of sound wave with a frequency higher than 20,000 Hz, which has good directionality, strong penetrating ability, easy to obtain more concentrated sound energy, and has a long propagation distance in water, which can be used for distance measurement, speed measurement, cleaning, welding, stone crushing, sterilization and disinfection, etc. There are many applications in medicine, military, industry, and agriculture. Ultrasound gets its name from the fact that the lower limit of its frequency is greater than the upper limit of a person's hearing.

The sound is circuitous, and the sound from downstairs can be transmitted upstairs through cracks such as windows. We shout in front of the building, and the people in the back of the building can also hear the shouting, which is the roundabout nature of the voice.

The sturdy solid floor slab conducts sound, so that the sound from downstairs can be transmitted upstairs. In ancient times, there was no modern communication equipment such as ** and mobile phones, when the enemy attacked, the soldiers put their ears on the ground, and they could hear the sound of horses' hooves and footsteps of the enemy approaching in the distance, and the solid ground could conduct sound. Similarly, the two sides of a solid wall speak easily and are easy to hear, while the two sides of a hollow wall are blurred.

Sound insulation materials are divided into several categories:

1. Porous materials, which are the most commonly used materials in engineering. Example: mineral wool, glass wool, foam, felt, perlite, etc.

2. Plate-like material. Example: plywood, asbestos cement board, gypsum board, rigid board, etc.

3. Forming ceiling sound-absorbing panels. Example: mineral wool acoustic panels, glass wool acoustic panels, soft fiberboard.

4. Membrane material. Examples: plastic film, canvas flushing oak rental, artificial leather. Leather.

5. Flexible materials. Example: The sea is like a loss, latex block.

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 substance.