In the professional sound engineering, if you mention the sound quality, it will naturally be associated with the feeling when listening. The sound quality belongs to the concept of psychological quantity. Therefore, the evaluation of sound quality is mainly a subjective evaluation of sound. In fact, the physiological structure of the human ear is very peculiar and complicated. So far, any physical instrument has been tested to detect the characteristics of the ear.
In the normal situation of professional audio engineering, the human ear can not only withstand the stimulation of the strongest sound in nature (sound pressure can reach 10^2-10^3 Pa), but for some reported sounds, It can be felt even in the case of sound energy as small as 10^-5 Pa. Therefore, the human auditory organization is a very high resolution, high sensitivity and wide collection of sound receivers, not only can analyze and select the sound, but also can rise to a spiritual feeling, can influence people Heart and emotions.
1. Sound quality generally has seven attributes
The electronic musical instrument synthesizes a sound, and generally forms a variety of sounds from arpeggio to liy, but the perception of people's hearing is also true for various sounds.
First of all, the simple pure tone. The sound quality is generally its pitch and loudness.
Second, the change in sound quality is called concordance and flatness. Of course, for the complex voice "Music or Language Officer" there are bright and dark. Rich and evenly divided months, therefore. In the sound quality evaluation, the sound quality attribute is usually divided into pitch and loudness. There are four sub-attributes, such as the three main attributes, the congruence, the flatness, the brightness and the richness. The relationship between the three main attributes and the four sub-attributes is shown in Table 1.4.1. 
As can be seen from the above table, the clear sound is a kind of high pitch, not only the loudness is small, but also a pleasant sound. The rich sound is usually a low pitch. Its loudness is loud, and the result is A pleasant voice.
The pitch of the seven properties of sound quality is usually related to frequency: it is directly determined by the lowest frequency (pitch) in the sound wave. Loudness is related to volume, which generally corresponds to the magnitude of the sound pressure level. Concordance refers to two or more compound tones (polyphony, that is, the sound of a common part). The number of its common parts. It shows the strength of the concord, the degree of concord. This attribute is also related to the change of loudness.
2. Hearing and vision 
In the visual we can divide the color into cool and warm colors. When we see red, orange, yellow and other colors, it will have a warm feeling, but if you see blue, purple, gray and other colors, it is easy to make people Think of the feeling of cold. These are all caused by feelings that are synaesthesia. This is a special case of synaesthesia.
In professional audio engineering, sound also causes people to feel visually, and many descriptions in life. It can be seen from Table 1.4.2. There are also many auditory terms, which are all transformed from visual terminology. .
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