Some acoustic phenomena in the room
At least 1/3 to 1/2 of each person's life is spent in the room, especially when listening to music. Therefore, the acoustic phenomenon in the room will inevitably attract people's attention.
Just as the mirror reflects light, the walls, floors, and ceilings of the house reflect the sound. Unfortunately, the sound waves cannot be seen. This phenomenon is often overlooked. In fact, the reflection of sound is very common and interesting (such as the echo wall of the Temple of Heaven in Beijing). Sounds from a certain part of the house will spread in waves and reach the listening position from countless ways. The actual reflection phenomenon is very complicated, and it varies greatly depending on the shape of the house and the objects in the room. I believe this is not difficult to imagine and understand.
Due to the existence of the reflection phenomenon, in the listening position, what we actually hear is not the sound directly emitted by the speaker, but the effect of the direct sound of the speaker and the superimposed sound of each reflection. So, what is the effect of this superposition? The concept of "reverberation time" is more common and important. It refers to the time course in which the energy of the sound wave gradually decreases in the continuous reflection after the direct sound. The application of the word "mixed" here is very image, because the sound heard somewhere in the room is not a single, but from all directions, chaos. The reflected sound is usually referred to as reverberation (or subdivided into early reflections and reverberations). Regarding the concept of reverberation time, it is acoustically defined accurately, which refers to the time elapsed when the residual sound energy density drops to the original value of one millionth of a second after the sound source stops sounding. It is worth pointing out that it can describe the clarity and fullness of the sound. Generally speaking, the reverberation time is short, the sound clarity is good, and the reverberation time is long, the sound is full.
Next, another phenomenon related to reflection, which is called an acoustic phenomenon called "simplified excitation", "resonance", and "resonance" in a room. This refers to the phenomenon that the room is particularly favorable for sound waves of certain frequencies due to its geometrical scale, and is strengthened (forms standing waves), which is also a ubiquitous phenomenon. For a typical family room, the fundamental frequency of this resonance is in the low range, which is within about 100 Hz.
If the room can't breathe sound
We can imagine from the above acoustic phenomena, if there is no sound absorption in the room, the room itself does not absorb sound, what kind of scene will be. At that time, once the sound is emitted, it will continue to reflect, and the sounds that are emitted before and after will be mixed. For example, in a room where a language broadcast is played, the first word is still ringing when the second word appears, and the first two words are still ringing when the third word appears... plus a different frequency The resonance sound, whether it is language or music, we will be completely indistinguishable (except for the first sound), not to mention the appreciation, only a noise can be heard! If the reader is interested, it can also simulate A: Find a polyphonic keyboard (the more polyphonic, the better), press the button in order to not let go, listen to the transition from music to noise. Of course these are just imaginations in an extreme situation. In fact, because the walls, the air, and the human body absorb sound energy, the reflected sound always disappears gradually. However, through such imagination, we can further understand the importance of sound absorption in the room. Fortunately, we are not living in an environment that does not absorb sound at all, otherwise it is really unimaginable!
Although the real room can absorb some sound energy, it is often not ideal. If we buy good audio equipment, they emit high-fidelity sounds, but because of the poor sound absorption characteristics of the listening room, the reverberation and resonance that should not be caused to seriously distort the original sound, what is it? Regret! Therefore, the true pursuit of high-fidelity playback should be the pursuit of reasonable sound absorption in the room.
Household Mini Fan, you can use this small Usb Fan on a table or a desk at home. The wind is smooth and gentle. This table fan is better for baby and the elder who cannot be cooled with strong wind. And this mini fan can be connected to a computer or a notebook or a power bank for recharging, which is very convenient and make your work or study more comfortable. The mini Portable Fan arm can be adjusted and the head can be rotation. With big power, but this mini desktop fan is very quiet and cool, which will not influence your study or work or rest. Different colors for choosing to make your life more colorful.
Household Fans,Portable Fans,Floor Fans,Electric Household Fans
SHENZHEN HONK ELECTRONIC CO., LTD , https://www.honktech.com