The size of the sound, how is the sound size calculated?

The higher the frequency, the louder the sound. Otherwise the opposite is true.

The human ear can sense sound pressure in a wide range. The faintest sound that the normal human ear can hear is called the auditory threshold, which is a pressure change of 20 microbar cards (abbreviated as PA), or 20x10-6 Pa ()."Twenty parts per million Bascal")。On the other hand, very noisy situations can produce large pressure variations, such as a space shuttle that can produce noise of about 2,000 Pa or 2 x 109 Pa at close range at maximum horsepower.

The table below shows the different SPLs generated by the above conditions, expressed in Pasca and Microbaska. If the Pa is used to express sound or noise, we have to deal with numbers as small as 20 and as large as 2,000,000,000. Obviously, it is quite inconvenient to use the word Pa to express sound or noise.

A simpler way to do this is to use a logarithmic scale to express the loudness of a sound or noise, based on 10. To avoid using Pascal (Pa) to express sound or noise (in case of dealing with numbers that are difficult to manipulate), the decibel (dB) scale is used. The scale is based on the auditory threshold, 20 Pa or 20 x 10-6 Pa as the reference sound pressure value, and defines this sound pressure level as 0 decibels (dB).

A decibel is a unit of sound pressure level and is denoted as d b. Used to indicate the magnitude of the sound. 1 decibel is about the sound that a person can just feel.

A suitable living environment should not exceed 4 5 decibels and should not be less than 1 5 decibels. According to the average person's sense of hearing, 0 2 0 decibels are very quiet, almost invisible. 2 0 4 0 dB is quiet, like a whisper.

4 0 6 0 dB average. Ordinary indoor conversation 6 0 7 0 dB is noisy and nerve-damaging. 7 0 9 0 decibels are noisy and nerve cells are destroyed.

9 0 1 0 0 dB Loud and hearing impaired. 1 0 0 1 2 0 decibels are unbearable, and a minute of deafness is temporary.

Resources.

Decibel 1 - A physical quantity that describes the magnitude of the sound.

Question 1: What determines the volume of sound in a speaker? First of all, it depends on the power of the speaker, which is marked on the nameplate of the audio How many ohms of impedance, how many watts of power, how much sensitivity and so on.

For speakers with the same impedance, God guesses that the power will produce a larger sound pressure level, which is "loud". The second is the output power of the power amplifier, and the loudspeakers with high power have to be pushed by the supporting power amplifier in order to make the "loud sound" they deserve, and the horse can pull the heavy car. The current sound sources are all standard, so the third one is omitted.

The labeling of active speakers is not very standardized, but the above two items can be considered comprehensively. To put it simply: the sound of the relatively powerful audio is loud.

Question 2: What determines the magnitude of the sound Loudness, whereas loudness is determined by amplitude, i.e., the greater the amplitude of the air vibration, the louder the sound.

Question 3: What determines the size of the audio sound The loudspeaker is loud, and the power amplifier is required to be large, and the sound of the tour modification push speaker is loud. The sound volume of the speaker is determined by the power amplifier.

The power of the speaker is the power of the speaker, and the power amplifier needs to be selected according to the power of the speaker, and the power and impedance need to be the same to match.

Question 4: What determines the volume of sound? What determines the level of sound? How can you tell the difference between different sounds?

Question 5: What are the factors that determine the size of a computer's sound file? The computer's fan and hard disk will be like this when aging, and the computer is the same as the car.

Question 6: The height of the sound is the pitch, which is determined by , and the size of the sound is also the loudness, which is determined by The three characteristics of the sound are: tone, loudness, and timbre; The pitch is determined by the frequency of the emitter (i.e., the speed of the vibration); Loudness is determined by the amplitude of the emitter (i.e., the amplitude of the vibration); So the answer is:

the frequency of the emitter; The amplitude of the emitter

Question 7: The factors that determine the loudness of the sound are and Loudness refers to the strength of the sound, which is determined by the amplitude of the vibration of the object, and is also related to the distance from the sound emitter Therefore, the answer is: amplitude; The distance from the emitter

1.Speak softly, a little lower than normal, and the vocal cords vibrate.

2.Do you have QQ**? Turn on the speaker (general pin first-pass) sound to the maximum, and then turn the sound of QQ** to 2, play the song normally, and the sound heard by Bu Dou is about 1m away.

3.The sound when the refrigerator starts is 36 decibels.

4.The general *** (volume 0 31) remove the headphones, turn on to 16, and the sound is about 10cm away.

In physics class, the teacher brought a decibel meter to measure it.

1.There are 3 characteristics of sound, loudness, pitch and timbre;

2.The loudness is the magnitude of the sound, which is related to the amplitude of the sound emitter, for example, the sound is changed by changing the amplitude of the current and thus the amplitude of the speaker;

3.The tone is related to the frequency, that is, the number of times the vocal body vibrates per unit time, and the sound frequency that we humans can hear is between 20 and 20,000 Hz, that is, it vibrates 20 to 20,000 times per second, and the higher the frequency, the higher the pitch, for example, the frequency of men's vocal cord vibrations is lower than that of women, so the voice is relatively low.

4.The timbre is related to the material and structure of the sound emitter, for example, the same tone, the same loudness of the sound, we can hear whether it is a flute or a suona.

Loudness is the subjective perception of the sound (commonly known as volume), which is determined by the "amplitude" and the distance between the person and the sound source.

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.

Pitch is the pitch of the sound (treble, bass), determined by the "frequency", the higher the frequency (frequency unit: Hz (hertz), the human ear hearing range below 20 is called infrasound, above 20000 Hz is called ultrasound) For example, the sound of the low end or higher sounds, such as thin strings.

In physics, pitch refers to the pitch of music, loudness refers to the intensity of the sound, and timbre refers to the characteristics of the sound, which should be distinguished.

The propagation of sound requires matter, which is called a medium in physics, and this medium can be air, water, or solids. Of course, in a vacuum, sound cannot travel. The speed at which sound travels in different mediums is also different.

The propagation speed of sound is related to the counter-equilibrium force of the medium, which means that when a molecule of a substance deviates from its equilibrium position, the surrounding molecules will squeeze it back into the equilibrium position, and the greater the counter-equilibrium force, the faster the sound will propagate. Water has a greater counterbalance than air, and iron has a greater counterbalance than water.

The propagation of sound is also related to temperature and resistance.

Sound can also be refracted by external materials, such as when a person shouts in front of a mountain, he can hear his own echo.

Another example is refraction: the sound travels farther at night than during the day, because the sound during the day encounters the rising hot air in the process of propagation, which quickly refracts the sound into the air; When the cold air descends at night, the sound will spread slowly and calmly on the surface, and it is not easy to refract.

The volume of sound is called "loudness", which is often referred to as "volume" in everyday life. The pitch of the voice is called "pitch". There is also a quality of sound called "timbre". Tone, timbre, and loudness are the three elements of sound.

Sound characteristics

1) Loudness: The volume of the sound (commonly known as the volume) that people subjectively perceive is determined by the "amplitude" and the distance between the person and the sound source, the greater the amplitude, the greater the loudness, and the smaller the distance between the person and the sound source, the greater the loudness. (Unit: dB dB).

2) Tone: The high and low of the sound (treble, bass), determined by the "frequency", the higher the frequency, the higher the pitch (frequency unit Hz (Hertz), hertz [url, the human ear hearing range below 20 is called infrasound, above 20000Hz is called ultrasound) For example, the sound of the low end or higher sounds, such as thin strings.

Frequency is the number of sound waves passing through a given point per second, and it is measured in hertz and is named HerichHertz's Acoustic Wonder is named. This person sets up a table and demonstrates how the frequency relates to the period per second.

1 kilohertz or 1000 hertz means that there are 1,000 cycles per second for sound waves passing through a given point, 1 megahertz means 1,000,000 cycles per second, and so on.

3) Timbre: Also known as the sound product, the waveform determines the timbre of the sound. 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. Typical timbre waveforms are square waves, sawtooth waves, sine waves, pulse waves, etc. The different timbres can be completely distinguished by the waveform.

4) Musical sound: a regular and pleasant sound. Noise:

From a physical point of view, the sound produced by the sound emitter vibrates irregularly; From the perspective of environmental protection, all sounds that interfere with people's normal work, study and rest, as well as sounds that interfere with the sounds that people want to hear.

5) Pitch, loudness, and timbre are the three main characteristics of musical sounds, and people distinguish sounds according to them.

1. Knock. The crash of something heavy falling.

Second, when. Onomatopoeia. The sound of crashing into the metal world.

Three, wow. Describe the sound of impact, spike and water flow, etc.

Fourth, boom. Describe thunder, artillery, ** and other loud sounds.

Five, boom. Onomatopoeia. The sound of impact vibration.

Sixth, smack. Describes the sound of a gun being fired, clapping hands, or something colliding.

Seventh, goo. Onomatopoeia. The cries of hens, turtledoves, etc.

Eighth, chirp. Onomatopoeia. The sound of a worm screaming or whispering a whisper.

9. Tweet. Onomatopoeia, describing the small animal is called Sou Yuansheng.

10. Chirp. Describe the sound of birds.