What are the parameters of audio quality evaluation
Sound quality evaluation can be carried out from several aspects, namely, brightness, fullness, clarity, balance, softness, strength, realism and three-dimensional sense.
1. High brightness, full midrange, clear and active listening experience. The bad system sounds dim.
2. The fullness is moderate and the bass is adequate, the treble is moderate, the loudness is appropriate, the reverberation is moderate, the hearing is warm, comfortable and flexible. Bad systems are thin and shriveled.
3. The degree of clarity of language is high, the band is distinct and clear. Bad systems are unbalanced.
4 The softness of the sound spreads well, the relaxation is not tight, the treble is not prickly, and the hearing is pleasant and comfortable. Bad systems sound hard.
5Voice force sound is solid and powerful, can come out, can dynamically change to reflect the sound source. A bad system has insufficient sound strength and cannot get out, and the dynamic range is compressed.
6. The sense of authenticity can maintain the original harmony. The bad system is unrealistic, distorted, sound stained, and exploded, broken, and trembling.
7. Three-dimensional sense of sound space, accurate positioning of sound image, continuous distribution of sound image group, suitable for recording width and depth. Poor systems have localized drift, lack of depth in the sound field, and improper width.
8. The balance of high, medium, and low sounds has certain scales. If neither temperament is particularly prominent, then the system is balanced.
The term of sound quality evaluation is based on the sense of listening, using some specific visual vocabulary that expresses the sound heard.
(1) Thick-thin sounds are solid and powerful, can stand up and come out, and can reflect the dynamic range of the sound source. This intensity is related to low-frequency and mid-low frequency (100-600hz) energy.
(2) Plumpness-shriveled plumpness should be consistent with the form of music and the characteristics of musical instruments, mainly related to the reverberation time and its frequency characteristics.
(3) The mixing-drying is determined by the reverberation time and characteristics, and the presence or absence of reverberation should be determined according to the exact characteristics of the music and musical instrument.
(4) Pleasant-unpleasant sound coloring, harmonic intermodulation distortion, too much reverberation, too much frequency compensation, audible limiting effect, etc., will produce unpleasant playback sounds, unpleasant sounds are No realism.
(5) Brightness-dull high, full midrange, bright and active hearing is bright.
(6) Touching-Plain and fascinating vivid replays must be consistent with the characteristics of the music.
(7) Improper use of natural-dyeing microphone and improper timbre compensation will cause acoustic staining. Standing waves or resonance in the listening room can also cause acoustic staining.
(8) Transparency-turbidity is the degree of harmony. The muddy sound cannot distinguish and clearly hear the sound of each single instrument, and the whole replay sound has a sense of being integrated. Both low bass and excessive reverb will cause a cloudy sound.
(9) Roundness-roughness This is roundness. The resonance of the room, the coloring and distortion of the sound, too much reverberation, and the wrong mixing, will produce an unpleasant, rough sound.
(10) Loudness-light loudness is related to subjective perceptions such as "fullness-shrunken" and "moving-indifferent".
(11) Wide-narrow (12) Clear-drift stereo positioning.
(13) Depth-the depth of the plane stereo. Excessive midrange and narrow high-frequency diffusion will cause the sound field forward (Forward) phenomenon, otherwise, the phenomenon of backward (Laid-Back).
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