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Regarding the role of this device, the direct reference to Baidu's explanation is relatively authoritative and easy to understand.
In home HIFI audio players, most people reject this device very much. Because "there are many ghosts in the incense burner", the more complicated the device is before the sound source reaches the speaker, the more it will affect the original taste of the music.
But in the car, if there is no such equipment, it will be farther away from the "original taste". Because the music at home is like our environment:
(Like my minimalist style~)
We are close to the speakers, so we can enjoy the stereo effect. Of course, if it is multi-channel, it is the same.
In the car, the listening environment is completely different.
The distance between the listeners and the speakers on both sides is relatively large because of the effect of the binaural effect. Not only can we not hear the image of the singer (musical instrument), we can't hear the correct sound field. Because the sound pressure on the left side of the horn is not only larger than the right side, but also reaches the ear first. So what we hear is that the singer is on the left. Because the models are different and the treble is different (some cars don't even have high pitches, the singer can only sing on the left), and the phenomenon of the left side is also strange.
This is an acoustic problem caused by distance.
Let's take a look at the problems caused by the speaker installation:
This is our regular speaker installation method. As for the gap pointed by the white arrow, this is solved.
Even if we solve the gap between the speaker and the door panel, there is still a problem.
A thicker gasket will form a tubular passage at the end of the horn. This channel will have a significant effect on the frequency band around 200 Hz and 500 Hz. The main performance is that the mid-bass will be more turbid. Coupled with the directivity problem of the mid-woofer, there are some acoustic defects.
The digital audio processor (DSP) is designed to solve these problems. When this device was first developed, the DSP was a separate device with no power amplification and was only responsible for processing the audio signal. The price of such equipment is generally around 4000+ to 10,000 yuan, plus the price of the host, amplifier, and speaker, plus the configuration of the audio processor is more than 10,000 yuan. Because for most riders, the original car speakers are hard to hear, but I did not intend to spend so much money to upgrade the sound system. This creates a market demand. Since 2015, many manufacturers have developed DSP amplifiers, which is to do DSP and amplifier together. Such products range from more than 1,000 to 10,000 yuan, of course, the quality is also uneven.
Let's take a look at how to solve the acoustic defects in the car.
(I am drawing, it’s ugly, you hit me~)
From this schematic diagram of post-modernism minimalism, we can see that the distance of each speaker from our listening position is different (because the high-frequency directionality is the strongest, it is explained by the position of the high-pitched sound. If all The car does not ignore this problem when it does active crossover.) We can solve the problem through this delay function of DSP.
There are also problems with uneven frequency response caused by installation conditions, speaker orientation, reflection absorption and even sound source problems. We can solve this problem by this function.
These two basic functions are the core functions of the DSP, and of course, the important functions such as high-low-pass filtering, but the focus is not explained in this article.
This is why I recommend you install such a device as long as the budget allows.
ShenZhen Antenk Electronics Co,Ltd , https://www.pcbsocket.com