Car radios have been in existence since 1930. Back then, you could get an AM radio added to your car for $130, roughly $1,500 in today’s money. Thankfully, you don’t have to spend extra money to get a car radio today. Better yet, you can plug a phone, tablet, or MP3 player into your speakers, or connect via Bluetooth. This is way better than the tape decks and CD players we all grew up with. However, the sound isn’t always good quality. Depending on your vehicle, you might experience some hissing or static when listening.
接地环噪声隔离器是解决此问题的一种解决方案。你插上你的蓝牙辅助适配器进入其中，然后将隔离器插入汽车的3.5mm插孔中。突然，所有信号噪音都消失了，好像是魔术。地面环噪声隔离器也不仅适用于汽车。您也可以将它们与家用立体声系统一起使用，以在您的状态上获得更好的信号蓝牙扬声器。而且它们不仅是蓝牙。您也可以使用它们连接耳机或通过3.5mm Aux连接的任何内容。但是与大多数电子设备一样，并非所有地面环噪声隔离器都不相等。
今天，我们将回顾市场上最好的三个最佳地面循环噪声隔离器。我们将查看它们的所有功能，看看它们如何相互堆叠。我们列表上的第一个选项是Besign接地环噪声隔离器。这是一个坚固的，强大的噪声隔离器，具有短，8.5英寸的电缆。我们要看的下一个是Aukey接地环噪声隔离器。这是一个非常紧凑的设备，并带有24英寸的电线。最后，我们将检查MPOW接地环噪声隔离器。这是一款中型设备，长3.3英尺。哪一个是最好的？让我们仔细看一下，找出答案。
是什么引起地面环噪声？
So, what causes static when you plug into an aux jack? For our purposes, we’ll be talking primarily about automotive stereo systems. But the same principles apply in a home stereo system.
您需要了解的第一件事是噪声是由电信号干扰引起的。由于立体声系统充满了电子组件，因此噪声实际上是不可避免的。制造商已经知道了多年，并在音频输入电路上安装了降噪电路。这些电路通过测量RCA电缆中心导体的信号来工作。然后将信号与RCA盾牌上的信号进行比较，RCA盾牌中的信号称为电术语中的“参考”。然后将信号之间的差异放大，从而消除噪声。
至少,这是真的theory. However, there are a few things that can go wrong with this. First off, the audio cable’s ground needs to be completely isolated from the amplifier’s internal chassis ground. A cheaply-manufactured amplifier – or one with a defect – might not fully isolate the grounds. This creates what’s called a “ground loop”, where some voltage flows from the chassis ground to the RCA ground. This creates noise in the signal after it’s already gone through the noise cancelling circuit.
这re are additional problems that pop up when you install an audio signal in a car. In most vehicles, the amplifier is located in the back of the car. Some manufacturers use the amplifier ground as a reference, instead of the head unit. The problem is that as the RCA cable runs from the rear of the car to the head unit, the noise changes. As a result, the noise cancelling circuitry has the wrong reference. As they say in computer programming, “garbage in, garbage out”. It’s not going to work properly.
Okay, that sounds pretty complicated. Let’s simplify it by using an everyday example: the humble bicycle. Picture a brake cable. It consists of two parts: an outer casing and a center cable. In this example, the cable is the main RCA signal, and the outer casing is the reference. When the inner cable moves relative to the casing, it moves on the other end, where the caliper is. It doesn’t matter how far apart the opposite ends of the casing are. When you turn the handlebars, your brake calipers remain open.
Now, imagine a brake cable that has no outer casing. It’s just a bare cable connected from the lever to the brake caliper. In this case, the brakes would only work when the handlebars were perfectly straight. If you turned the handlebars one way, the cable would slacken. When you squeezed the brake lever, the calipers wouldn’t tighten because of the slack. If you turned the other way, the cable would tighten, and the brakes would engage, causing you to crash. Without a reference, there would be noise in the signal.
现在，让我们想象您在刹车杆和后卡钳上包裹一条巨大的橡皮筋。您可以调整制动器，以便在自行车直行时正确工作。然后，当您转动车把时，刹车仍然无法正常工作。他们在某种程度上工作了，但是橡皮筋仍然会对制动施加一定的控制。这类似于接地循环及其在系统中产生的噪音。
How Does a Ground Loop Noise Isolator Work?
那么，接地环隔离器如何纠正噪声？地面环噪声隔离器在每个通道上具有单独的隔离变压器。变压器会磁传递音频，但不会传输电力。结果，消除了由接地环引起的直流噪声。当然，这是假设信号通过变压器后没有引入干扰。
Unfortunately, most ground loop noise isolators require installation inside of the electrical system. If you run a Google search, most of the results you see will be RCA devices. This means you have to tear your car apart and perform a complex physical installation. It works, but it can be a pain. The options we’ve chosen plug directly into your car’s 3.5mm aux port. On the one hand, they won’t remove noise from devices that don’t input through your aux port. For example, you might still get ground loop noise from your radio. But when you’re using an aux input, the signal will be crisp and clear. Moreover, installation is as easy as it gets. Just plug them in, and you’re ready to go.
点击接地环噪声隔离器
这点击接地环噪声隔离器consists of a fob attached to an 8-inch 3.5mm cable. It’s designed to be as light as possible, and tips the scales at only 0.81 ounces. The fob itself is also compact, measuring only 3.5 inches long, 1.5 inches wide, and 1 inch thick. This compact size and light weight make it ideal for automotive use. Plug it into your aux jack, and you won’t have a long cable flapping around in your vehicle.
这design of the fob is attractive. It has soft, rounded corners that won’t hurt if you bang into it. The shell is a glossy black ABS plastic that’s attractive to look at. On the top, there’s a white BESIGN logo on an oval plate that looks like black stained wood. The design is also nice and sturdy. Where the cable connects, there’s a flexible rubber reinforcement that prevents damage from twisting.
Like all the ground loop noise isolators on our list, the BESIGN isolator is bi-directional. This means that it can pass a signal in both directions. As a result, you’re not just limited to listening to music. You can also use a Bluetooth fob to connect your phone for hands-free calling. The noise isolating system is very effective. You won’t hear any static, pops, or other unwanted artifacts.
Aukey地面环噪声隔离器
这Aukey地面环噪声隔离器has a similar design to the BESIGN isolator. It consists of a fob on the end of a 24-inch 3.5mm aux cable. This cable is a double-edged sword. On the one hand, it’s probably more cord than you want to deal with in your car. On the other hand, it makes the AUKEY isolator more versatile. For example, you can use it in your home stereo system. With a shorter cable, placement on a home stereo system might be difficult or inconvenient.
这fob itself measures 2.3 inches long, 0.8 inches wide, and 0.8 inches thick. And at 1.58 ounces, it’s fairly lightweight. But why does it weigh almost twice as much as the BESIGN fob? The difference is that it has more robust internal electronics. The transistors are of a higher quality, and do a better job at noise isolation. That said, for some reason, it seems to cut out some of the bass. It’s not terrible, but it’s noticeable if you’re an audiophile. Then again, you can just adjust your stereo’s EQ to compensate.
这fob is sturdy and attractive, with a satin black ABS plastic shell. The edges are all rounded, which makes it safer as well as more attractive. There’s a glossy AUKEY logo on the top, and a reinforced cable to prevent damage. Best of all, if it does get damaged, you’re protected by AUKEY’s 24-month manufacturer’s warranty. If anything goes wrong, just file a claim for a free replacement.
Mpow Ground Loop Noise Isolator
在大多数方面，Mpow Ground Loop Noise Isolator实际上与Besign隔离器相同。它更紧凑，长2.01英寸，宽0.59英寸，厚度为0.59英寸。它也很轻，重量不到一盎司。FOB是具有矩形外形的光滑黑色ABS塑料。在前面，有一个白色的MPOW徽标，并且电缆在与FOB的位置加固。除了令人印象深刻的24个月保修外，您还获得了45天的退款保证。在此期间，如果您不喜欢它，只需将其发送回。
这noise isolation is very good, reducing almost all the noise in the signal. Popping, crackling, and static are all virtually completely removed. However, the cable is 3.3 feet long. This might be a bit longer than is ideal for automotive use. On the other hand, it’s great for home use. You can plug it into your stereo system. Even if you plug into the back of the stereo, you can still wrap it around to the front with no issues.
最终判决
正如你所看到的,没有真正的差异rence between these devices in terms of quality. They all come from well-regarded manufacturers, and you’re not going to be disappointed with any of them. This is to be expected. A ground loop noise isolator is a pretty simple device. It might be tough to explain how they work, but they utilize well-understood principles of electronics. Unless there’s a manufacturing defect, it’s going to get the job done. There’s one exception to this, which is theAukey地面环噪声隔离器。This option offers slightly better noise isolation at the expense of some loss in bass output. As a result, it’s better for phone calls and not as good for music. But the difference is minute.
这点击接地环噪声隔离器和Mpow Ground Loop Noise Isolator基本上是相同的。至少,这是真的terms of audio quality. However, there are still a couple of differences in terms of physical design. The BESIGN Ground Loop Noise Isolator has a fairly short cable. At first, this might not seem like a good thing. But it’s very useful for automotive use. You won’t have to worry about what to do with a long cable. By contrast, the Mpow Ground Loop Noise Isolator has a longer cable. This makes it better suited for home stereo systems, especially if the aux jack is located on the back.
