Generally, according to the three elements of musical sound quality, that is, the change and combination of loudness, pitch and pleasantness, subjectively evaluate various properties of sound quality, such as low frequency loudness for fullness of sound, high frequency loudness for bright sound, and low frequency for weak sound. The high frequency is weak and the sound is clear. In the following, several typical senses of hearing are introduced in combination with sound source, sound field and signal characteristics.
The stereoscopic effect mainly consists of a sense of space (surrounding), a sense of orientation (direction), and a sense of layering (thickness) of the sound, and the sound having these senses is called stereo. The various sound fields in nature are themselves three-dimensional, and it is the most important feature of the sound source. The De Boer effect proves that the physiological characteristics of the human ear are: the human ear is on the symmetry axis of the two sound sources. When the sound pressure difference Δp=0dB and the time difference Δt=0ms, the sound source of the two sound sources is the same. There are two sound sources; when △p>15dB or Δt>3ms, the human ear feels that there are two sound sources, and the sound image moves to the sound pressure or the sound source before the lead, every 5dB sound The pressure difference is equivalent to the time difference of lms. The Haas effect further proves that when △t=5ms~35ms, the human ear feels that there are two sound sources; and when the near reflection sound, the lag direct sound or the time difference of two sound sources △t>50ms, even once The loudness of the reflected sound (also known as near or pre-reflected sound) or the lag sound is many times greater than the loudness of the direct sound or the leading sound, and the sound source orientation is still determined by the direct sound or the leading sound.
According to the physiological characteristics of the human ear, as long as the sound intensity, delay, reverberation, spatial effect, etc. are properly controlled and processed, the man-made manufacturing has a certain time difference Δt, phase difference Δθ, sound pressure. The sound state of the difference ΔP, and the state of the sound wave generated by the original sound source at both ears is exactly the same, and the human can truly and completely feel the three-dimensional sense of the reproduced sound. Compared with monophonic sound, stereo usually has the characteristics of scattered sound image, proper volume distribution of each part, high definition and low background noise.
Positioning Sense If the sound source is recorded after recording in left, right, up and down, front and back, the sound received and reproduced should be able to reproduce the orientation of the sound source in the original sound field. This is the sense of positioning. According to the physiological characteristics of the human ear, the maximum time difference between the first sound source and the direct sound of the two ears is 0.44ms~0.5ms, and there is also a certain sound pressure difference and phase difference. Physiological psychology proves that the 20Hz~200Hz bass mainly depends on the phase difference positioning of the two ears. The 300Hz~4kHz midrange is mainly determined by the sound pressure difference, and the higher treble is mainly located by the time difference. It can be seen that the sense of positioning is mainly determined by the direct sound that first reaches both ears, and the one-time reflection sound that arrives at both ears and the reverberation sound that is reflected multiple times in all directions mainly simulate the spatial surround feeling of the sound image.
Spatial sense of one-time reflection and multiple-reaction reverberation sounds have a small effect on the direction of sound, but the reflection sound always reaches the ears from all directions, which has an important influence on the size of the surrounding space. Surrounded by the feeling of being surrounded, this is the sense of space. The sense of space is more important than the sense of positioning.
The layered sound is high, medium and low frequency, and the frequency is balanced. The high-pitched harmonics are rich, clear and slender and not harsh. The midrange is bright and prominent, full and full without hard, and the bass is thick without nasal sound.
The thickness of the bass is calm and powerful, heavy and not turbid, high-pitched, moderate volume, certain brightness, suitable reverberation, and low distortion.
The stereoscopic effect mainly consists of a sense of space (surrounding), a sense of orientation (direction), and a sense of layering (thickness) of the sound, and the sound having these senses is called stereo. The various sound fields in nature are themselves three-dimensional, and it is the most important feature of the sound source. The De Boer effect proves that the physiological characteristics of the human ear are: the human ear is on the symmetry axis of the two sound sources. When the sound pressure difference Δp=0dB and the time difference Δt=0ms, the sound source of the two sound sources is the same. There are two sound sources; when △p>15dB or Δt>3ms, the human ear feels that there are two sound sources, and the sound image moves to the sound pressure or the sound source before the lead, every 5dB sound The pressure difference is equivalent to the time difference of lms. The Haas effect further proves that when △t=5ms~35ms, the human ear feels that there are two sound sources; and when the near reflection sound, the lag direct sound or the time difference of two sound sources △t>50ms, even once The loudness of the reflected sound (also known as near or pre-reflected sound) or the lag sound is many times greater than the loudness of the direct sound or the leading sound, and the sound source orientation is still determined by the direct sound or the leading sound.
According to the physiological characteristics of the human ear, as long as the sound intensity, delay, reverberation, spatial effect, etc. are properly controlled and processed, the man-made manufacturing has a certain time difference Δt, phase difference Δθ, sound pressure. The sound state of the difference ΔP, and the state of the sound wave generated by the original sound source at both ears is exactly the same, and the human can truly and completely feel the three-dimensional sense of the reproduced sound. Compared with monophonic sound, stereo usually has the characteristics of scattered sound image, proper volume distribution of each part, high definition and low background noise.
Positioning Sense If the sound source is recorded after recording in left, right, up and down, front and back, the sound received and reproduced should be able to reproduce the orientation of the sound source in the original sound field. This is the sense of positioning. According to the physiological characteristics of the human ear, the maximum time difference between the first sound source and the direct sound of the two ears is 0.44ms~0.5ms, and there is also a certain sound pressure difference and phase difference. Physiological psychology proves that the 20Hz~200Hz bass mainly depends on the phase difference positioning of the two ears. The 300Hz~4kHz midrange is mainly determined by the sound pressure difference, and the higher treble is mainly located by the time difference. It can be seen that the sense of positioning is mainly determined by the direct sound that first reaches both ears, and the one-time reflection sound that arrives at both ears and the reverberation sound that is reflected multiple times in all directions mainly simulate the spatial surround feeling of the sound image.
Spatial sense of one-time reflection and multiple-reaction reverberation sounds have a small effect on the direction of sound, but the reflection sound always reaches the ears from all directions, which has an important influence on the size of the surrounding space. Surrounded by the feeling of being surrounded, this is the sense of space. The sense of space is more important than the sense of positioning.
The layered sound is high, medium and low frequency, and the frequency is balanced. The high-pitched harmonics are rich, clear and slender and not harsh. The midrange is bright and prominent, full and full without hard, and the bass is thick without nasal sound.
The thickness of the bass is calm and powerful, heavy and not turbid, high-pitched, moderate volume, certain brightness, suitable reverberation, and low distortion.
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