This article lists some common sound phenomena in audio systems. However, the sound of audio equipment is diverse and not limited to the phenomenon mentioned in this article.


The original text is written in Chinese and the English version is translated by Google.
If in doubt, please refer to the original text.

Audio equipment sound

The music played by a traditional instrument, the frequency change from one note to the next, has a period of gradual transition between two frequencies. In music performance, the sound of the performer's manipulation of the instrument, its frequency and amplitude change is the process by which the performer expresses emotion through the instrument. Various emotions such as joy, anger, sorrow, etc., which can be expressed by the music, are performed by the performer after he or she understands this piece of music, using the performance skills he or she has mastered. This performance reflects the emotional depth of the performer's input into the piece. We can also find the personal interpretation style of the performer from this performance.

The sound difference between the audio equipment and the live performance is reflected in the accuracy of the frequency and amplitude changes over time. The audio system is affected by various factors, causing linear distortion (various distortion of the audio system, which will eventually be reflected as linear distortion), and the emotion expressed by the music will be biased, and the following sound characteristics will be presented to varying degrees.

Audio equipment
The resonance of the audio room (sonic resonance). The speakers are placed in the room and together with the room form a new frequency response. On this frequency response characteristic curve, there will be a plurality of acoustic resonance frequency points associated with the room and the position of the speaker. Affected by the interaction of the amplifier and the speaker, the electrical/acoustic conversion sensitivity of the resonance point increases nonlinearly as the sound pressure increases. When the sound pressure reaches a certain level, a positive electro-acoustic feedback unique to the audio room will appear, triggering the sound wave resonance of the room. In the same way, the box sound of the speaker will also increase due to this positive feedback phenomenon.

Another manifestation of audio sound is the representation of high, medium and low frequencies. The audio system processes the music electrical signal. If the delay time of each frequency component in the signal spectrum is inconsistent, the transmission time of some frequency components is different from the others. These frequency components will be in error at the position of the time axis. This causes the trajectory of the voltage amplitude to change with time to break as the signal frequency changes. And each frequency component arranged on the time axis will also exhibit group drift with frequency as a parameter. When the music signal reorganizes the sound via the speaker, there are different degrees of high, medium and low frequency separation in the auditory sense.

The main manifestation of the audio sound is: The beginning of the note sound is shorter, and the sound pressure lacks a transition time from weak to strong. The end of the sound is shorter, and because of the lack of ambient sound between the two notes, it is easy to feel a gap between the two notes.

Another manifestation of audio sound is the excessive dependence on the integral effect of the filter to extend the start and end phases of the sound. This treatment has caused more loss in the micro-dynamics of the sound and the original details.

Affected by the above factors, the audio system plays music, and the emotional expression in the music performance has been lost to varying degrees, and the sound becomes hard and rigid.

Created by Chen
Last revision date: Aug-2019

 

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