What is the relationship between loudness and amplitude and decibels?

There are many factors that go into being heard. The simplest measure is the loudness level mentioned above, as long as the sound determined by the sound pressure level and frequency is above the zero loudness level curve, then it is a sound within the audible threshold, and a normal person can hear it. So Hong Kong Zhen, the decisive factor of my rush is:

You are deaf or not......It's not that simple at all, is it? I'll jerk you off again, oh no. At first, for some reason—perhaps Billy Helrington slapped the iron door of the locker in the locker room, or Adolf Hitler threw a pen on the desk in his office—in short, this act provoked a disturbance in the air that caused the air in the place to move out of its original equilibrium position, and then that part of the air inevitably pushed the air adjacent to it.

Air has mass and therefore inertia, and air is elastic, so that at first this part of the air is subjected to a force that prevents its movement, forcing it to return to its original position. For the same reason, the air adjacent to the starting position will also do this motion, just with a time lag. If this continues, the initial vibration will be transmitted by the air, which is the coal of the paper (crossed out) and the juice (crossed out), all the way to your ears.

You can imagine the longitudinal waves on a spring that a middle school teacher loves to demonstrate. And, due to the attenuation of energy and other complicating factors, the amplitude will not be the same as the source in practice. <>

The greater the amplitude of the sound source, the louder the sound.

Experiment: What determines loudness?

Experimental equipment: iron frame, thin wire, styrofoam ball, tuning fork, small hammer.

Experimental procedure: first use a small force to knock the tuning fork, and use the vertically suspended styrofoam ball to touch the sounding tuning fork; Listen to the strength of the sound made by the tuning fork twice, and observe the height at which the ball is bounced twice.

Phenomenon: The loudness of the second tuning fork is large, and the ball is bounced high Conclusion: The greater the amplitude of the sound source, the louder the sound.

The amplitude refers to the absolute value of the difference between the numbers drawn in this period and the numbers drawn in the previous period by digits. Basic Concept: Amplitude refers to the maximum value that can be reached by the physical quantity of vibration, usually expressed as a. It is a physical quantity that indicates the range and intensity of vibration.

Hertz is the unit of frequency The magnitude of the frequency does not affect the magnitude of the amplitude, the two are independent The wave function can be transformed into the form of f(x) = asin (ax + b) + bcos (cx + d) (only the part with the lowest frequency is listed), the superposition of a and b is the amplitude, a and c can represent the frequency.

Hertz (symbol: hz) is the SI unit of frequency, which indicates the number of times a periodic event occurs per second.

Hertz is named after Heinrich Hertz, the first scientist to experimentally verify the existence of electromagnetic waves, and is often used to describe sine waves, musical sounds, radio communications, and computer clock frequencies.

The loudness and amplitude of the sound.

Relate. The greater the amplitude, the louder it is, and the smaller the amplitude, the smaller the loudness.

Loudness is also known as volume. The strength of the sound perceived by the human ear is a subjective perception of the magnitude of the sound. The magnitude of the loudness is determined by the amplitude of the sound reception, and the farther the amplitude travels to the same sound source, the smaller the loudness; When the propagation distance is constant, the greater the amplitude of the sound source, the greater the loudness.

The magnitude of loudness is closely related to the sound intensity, but the change of loudness with sound intensity is not a simple linear relationship, but is close to logarithmic.

Relationship. When the frequency of sound and the waveform of sound waves change, people's perception of loudness will also change.

Amplitude refers to the physical quantity of vibration.

The maximum value that can be reached, usually denoted by a. It is a physical quantity that indicates the range and intensity of vibration.

In mechanical vibration, amplitude is the absolute value of the maximum displacement of an object from its equilibrium position when it vibrates.

The amplitude is numerically equal to the magnitude of the maximum displacement. The amplitude is a scalar quantity.

Units are expressed in meters or centimeters. Amplitude describes the magnitude of the vibration amplitude of an object and the intensity of the vibration.

In AC circuits, current amplitude or voltage amplitude refers to the maximum value of current or voltage change, also known as the peak value of voltage or current.

In acoustic vibration, the amplitude is the maximum value of the difference between the sound pressure and the pressure at rest. The amplitude of the sound wave is measured in decibels.

for units. The amplitude of the sound wave determines the sound intensity.

The amplitude of a simple harmonic vibration is constant, it is a constant determined by the initial conditions of the harmonic vibration (initial displacement and initial velocity). The energy of the harmonic vibration is proportional to the square of the amplitude. Therefore, the square of the amplitude serves as a sign of the harmonic vibration intensity.

The amplitude of the stabilization phase of the forced vibration is also a constant, and the amplitude of the damping vibration is gradually decreasing.

Amplitude and frequency are two different concepts to describe fluctuations. There is no obvious connection between them.

The frequency determines the pitch of the voice. The amplitude determines the amount of energy, which can be simply understood as the sound we hear. When you play the same string on a tuned guitar, the strings vibrate at the same frequency.

But the intensity of the bullet is different, and the sound we hear is different. That is, it is caused by the different amplitudes of the fluctuations.

Frequency, which is the number of times a vibration is completed per unit of time, is a quantity that describes the frequency of reciprocating motion of a vibrating object, commonly represented by the symbol f or v, and the unit is seconds-1. In honor of the contribution of the German physicist Hertz, the unit of frequency was named Hertz, or "Hertz" for short. Every object has an amplitude-independent frequency that is determined by its own properties, called natural frequencies.

The concept of frequency is not only used in mechanics and acoustics, but also in electromagnetism and radio technology. The number of times an alternating current completes a periodic change per unit of time is called the frequency of the current.

Decibels are the units of sound intensity.

It is positively correlated with amplitude.

Decibels = 20log (amplitude) is independent of frequency.

PS: Sometimes the decibel indicates the multiple of gain or amplification.

Nothing to do with sound.

The magnitude of the frequency is what determines the pitch of the voice, and the amplitude is the factor that determines the loudness. However, when the amplitude is large, the frequency will definitely decrease relatively and is inversely proportional.

If you bring this question to the situation where people speak, it is related.

It will be affected by the dot, but people can control the frequency, when you want to scream, your output loudness must not be large, when you want to be louder, please keep the bass.

The louder the sound, the greater the decibel number, and the magnitude of the sound is related to the amplitude of the object vibration and the distance from the sounding object, so suddenly change the volume, maybe the volume is 80 decibels, and it will be 20 at once. The original room had 20 decibels, and then the sound was 80 decibels, and the decibel count increased.

The magnitude (loudness) of the sound emitted by an object is related to the energy of the vibration for the same object. The greater the energy, the louder it is. The energy of the vibration is related to the amplitude.

For different materials, it will also affect the amount of sound it produces (loudness). The loudness of the sound heard is also related to the distance from the vibrating object. The farther it goes, the less loud it is.

This is not true. Decibels are inherently loudness units.