In recording acoustics, loudness, loudness level, sound intensity, sound intensity level, sound pressure, sound pressure level, decibel, square, level, gain, pitch, and sound score are always headache inducing
Several concepts, let's briefly explain their meanings and differences, and organize their order.
Decibel
The decibel is the most commonly used unit in sound level measurement, abbreviated as dB. The lowercase d represents the decibel in English, while the uppercase B represents the bell in English
The use of lowercase d and uppercase B mainly indicates that the relationship between decibels and bell is 1:10, which means that 1 decibel is equal to one tenth of a bell.
It should be noted that 0dB does not represent a completely silent state, but rather represents the threshold point of the human ear, which is the lowest sound pressure level that can be detected by people with normal hearing.
Doubling the power represents a 3dB increase in gain (such as in a mix where one track of sound is 100dB, copying this track and playing it together will result in a total volume of 103dB, and
Non 100+100=200dB), while doubling the voltage represents a gain increase of 6dB.
level
A time variable, such as power or field, that is calculated as a mean or weighted value in a specific way within a specific time interval. Its units can be measured relative to the reference value
Represented in logarithmic form, such as' decibels'.
In recording, simply understood, level is a way of reflecting the current volume of sound in an electrical expression. For example, "Increase the level value of this track by 3dB"
It can be understood as' turning up the volume along this way by 3 decibels'.
gain
The degree of increase in current, voltage, or power of components, circuits, equipment, or systems is usually specified in decibels (dB). Here, it can be simply understood as
A state of increase.
pitch
Refers to the characteristic of hearing that distinguishes between high and low musical sounds. It is determined by the frequency of sound wave vibration, with higher frequencies indicating higher pitch; Low means low sound.
Cent
To improve the accuracy of measuring the height of sound, each "half tone" interval (such as C~# C or B~C) is defined as 100 minutes in metrology to facilitate the calculation of its error rate.
That is, 1cent is one percent of the Minor second interval.
Acoustic energy
The total amount or overall energy exhibited by sound in motion is usually expressed as sound energy.
sound intensity
The average sound energy per unit area passing through the direction perpendicular to the propagation of sound waves per unit time is called sound intensity. The sound intensity is expressed in I, in watts per square meter.
Sound intensity level
Research in Psychophysics shows that people's perception of sound intensity is not proportional to sound intensity, but proportional to its logarithm. This is precisely how people use sound intensity levels
To indicate the reason for sound intensity. The decibel value obtained by logarithmic operation of sound intensity that corresponds to human auditory perception, expressed in dBSPL. (SPL is the sound intensity level Sound
Intensity Level
sound pressure
The difference between the pressure and static pressure in the medium in the presence of sound waves.
Sound pressure level
Although sound intensity can theoretically represent the amplitude of sound waves at a certain point and can be measured to obtain its value, it is not commonly used in daily work
To elaborate on the magnitude of sound amplitude. Due to
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