Chinese phone - background noise (interference, hum) during a conversation - reasons and solutions. How to remove noise, interference, or crackling in headphones

The noise in the photo is perennial problem, which both beginner photography lovers and professionals face. Digital noise appears as discrete light, dark, or colored dots that can fill entire areas in a photo. Mobile phone owners who shoot in low light with their gadgets are well aware of this problem. However, owners of advanced SLR cameras are often faced with the fact that contrasting points appear in the photographs, which spoil the overall impression of the pictures. In this article we will talk about how to reduce the effect of noise on photos when shooting, as well as how to eliminate such minor image defects with software.

Reducing noise in the photo when shooting

It should be noted right away that there is always noise in digital photography, and this is due to the peculiarities of the photosensitive matrix, which forms the basis of any digital camera. However, in most cases, the noise level is so low that the human eye is unable to see image defects. But in some situations, especially when shooting under conditions insufficient lighting, digital noise in the picture is already becoming clearly visible. There are several ways to reduce the effect of noise when shooting:

- Do not use high values \u200b\u200bof light sensitivityISO

Perhaps the main reason for the appearance of noise in photographs is too high ISO sensitivity set by the photographer. When shooting in low light in the absence of a flash, you have to increase the sensitivity of the sensor to make the photo brighter. However, increasing the ISO value in the camera settings too much will make the images too noisy.

The influence of the ISO value can be estimated using an example, in the area of \u200b\u200bthe photo inside the red oval (clickable):

Noise reduction

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While photo equipment manufacturers are currently working hard to reduce noise at high ISO settings, it is not worth recklessly using the wider ISO range. It is better to choose the lowest possible or average ISO value, and only after test photos make the appropriate conclusions about the need to increase the sensitivity of the matrix. Therefore, increase the ISO value only when really necessary.

Try to use fast lenses or flash in low light conditions. With regard to optics, the wider the aperture is opened, the faster the shutter speed can be made. All this will allow you to take better photos in low light without the need to seriously increase the ISO sensitivity and, thereby, increase the risk of noise.

- Shoot with a tripod

To reduce noise, it is advisable to use a tripod or monopod on which you can mount a digital camera. This is especially true for situations where you are shooting any kind of static subject in low light conditions. Using a tripod will allow you to set the camera's sensor sensitivity to their lowest setting, which in turn will reduce the likelihood of digital noise appearing in your images.

- Preventing the camera from overheating

It is no secret that digital noise begins to manifest itself more strongly when the sensor of a digital camera heats up. A simple rule applies here - the higher the matrix temperature, the more noise in the photo image. In this regard, try not to shoot for a long time in hot conditions, high humidity and exposure to direct sunlight, and do not use unnecessarily long exposures.

Also, keep in mind that when using LiveView in digital sLR cameras the photosensitive matrix works not only during the exposure of the frame, but also a little longer, which can lead to its additional heating. Therefore, do not overuse shooting in this mode, give the sensor of your camera time to cool down.

- Shooting inRAW

Shoot preferably in RAW format. This format contains more information than JPEG, so you have more opportunities to get a high-quality picture. In addition, you can reduce noise in the photo image already when converting RAW files by using software for processing images.

Modern digital cameras are equipped with various noise canceling functions, but the software algorithms used in them are far from perfect and do not always suppress noise correctly. Often, using such a function leads to the loss of small parts Images. In addition, if your camera has already removed some of the noise, this can complicate the subsequent processing and fine-tuning of the photo on a computer.

How to remove noise from photos in Photoshop

Using the capabilities of one of the graphic editors, you can safely remove digital noise from your photo. IN Adobe Photoshop this procedure is usually performed through the standard Reduce Noise filter (through the Filter - Noise - Reduce Noise menu). Before processing the image, you need to open it in Photoshop and duplicate it (Layers - Duplicatelayer). Thanks to this, at the end of the noise removal work, you can always compare the original with the processed image. After opening the Reduce Noise filter, you start working in the (Basic) mode, where the following options will be available:

- Intensity or strength (Strength). This parameter provides a reduction in luminance noise - the more to the right you move the slider, the more the noise will be attenuated. The main thing here is not to overdo it, so that along with the digital noise various small details do not disappear from the photo.

- Preserve Details. By adjusting this slider, you can restore the disappeared small details of the photo, but keep in mind that noise will also return in the photo. Here you will have to find the optimal balance between leaving the fine details of the photo and resigning to the presence of a certain level of noise and completely eliminating the noise, resigning to the loss of some details.

- Reduce color noise (Reduce Color Noise). This option is used to remove color spots from the photo.

- Sharpen Details. With this option, you can try to restore the sharpness of the photo image, which naturally degrades with decreasing digital noise.

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ISO 25600 - after noise reduction

Experiment with the settings and then go to additional mode the same filter (Advanced). Here you can reduce noise in a single channel using the Per Channel tab. For each channel, you can change all of the above-mentioned parameters "Intensity" and "Save details".

Pick up optimal settings filter for a particular photo image. If you need to get rid of the so-called luminance noise, that is, from small elements in the photo that have differences in brightness, then you can start with following installations: Intensity - 9 - 10, Preservation of details - 3 - 6%. If you are dealing with chromatic noise (the presence of colored spots in the photo), then you can set the following value of Reduce Color Noise - 70 - 100%.

In conclusion, it should be noted that the degree of the problem of digital noise in photographic images is often exaggerated by the photographers themselves, who simply do not want to see any "defects" in their pictures. However, it should be remembered that viewing a picture at 100% scale on a computer monitor, you will see noise that is several times larger in area than in the same photo posted, for example, in an online photo album. In addition to this, any universal algorithms noise removal does not currently exist. This means that suppression of noise or its elimination by software means one way or another leads to a partial loss of small details, deterioration of color accuracy and sharpness of the photo. Therefore, you do not need to strive to always completely remove noise in your photographs; in most cases, simply reducing it to an acceptable level will be enough. Although if you plan to engage in commercial or stock photography, then you will have to be more strict with the technical side of the pictures and similar minor defects in photographic images.

Causes of noise in headphones:

You connected headphones to a computer or laptop, and instead of pleasant and favorite music you hear annoying hiss or crackling, who will like that? At the same time, you do not understand why there is noise in the headphones, where it came from and what to do with it.

The most annoying thing about the noise effect on headphones is that it is very difficult to figure out why it appeared and how to fix it. There can be a lot of reasons for the cracking of headphones, the usual algorithm for finding the cause of poor performance of a headphone is to sequentially search through potential noise sources, exclude or isolate them, and then check them further. In theory, this looks simple, but in practice, such an algorithm is completely impossible to implement.

For example, you have only one computer, which is connected to an outlet that is embedded in concrete wall, the apartment has been renovated and it is impossible to install a computer in another place, or another room, because there is no place for him. And therefore, we cannot rule out all possible causes of the occurrence of extraneous noise in the headphones.

However, we can start with the simplest and most obvious potential causes of interference in headphones, and if testing them will not work, then we will only have to hope that in the future this problem will eliminate itself. For example, the neighbors will turn off the hammer drill, or after a while you will buy a voltage regulator through which you connect your computer.

So, let's start looking for the cause of the hiss in the headphones.

Damaged cable is a very common cause of hiss and crackles in headphones

Let's start with the simplest and most common cause of extraneous noise in headphones - a damaged cable or poor contact in the socket.

Take a close look at the headphone cable, it must be absolutely intact, there must be the same density inside along its entire length. Feel the entire cable with your hands, perhaps there was an interruption in some place inside the cable, or once you bent the cable too much and the copper cores inside it broke.

If, after visual and tactile inspection, the cable is not suspicious, check the jack, its joints and the audio jack itself where you plug the headphones.

Check how well you insert the jack into the jack, it should fit easily, with a light click and hold firmly in it. The jack must enter the socket all the way, there must be no visible part of the jack.

Sometimes, due to the peculiarities of the structure of the nest, about 1 mm of the jack remains visible, but no more, and this is a rare phenomenon.

Poor contact is one of the most common causes of noise and crackling in headphones. Wipe the jack dry soft clothit may be dirty or covered with an oxide layer.

If the wire does not arouse suspicion and the jack is connected to the jack securely, but the noise remains, you need to continue the search.

Headphone technical condition - a possible cause of white noise

After checking the wire and jack did not give a result, you must definitely check the headphones themselves.

Examine them carefully, they may have recently fallen on a hard surface, cracks or other signs of damage appeared on the case.

Be sure to try connecting the headphones to another audio source, such as a phone, TV, or tablet.

It is very important to understand and establish that the cause of the white noise in the headphones is not the headphones themselves, but the device to which they are connected.

If, when connected to another device, the white noise disappeared, then the headphones themselves are in order, along with the wire and the jack, and we proceed to further search for the occurrence of crackling.

Inexpensive speakers can cause noise in headphones

If headphone noise occurs when connected to a computer or laptop that has inexpensive multimedia speakers connected at the same time, first try unplugging the speakers to check if the noise has disappeared from the headphones.

The fact is that inexpensive speakers are assembled from cheap elements, but most importantly, when assembling them, they greatly save on soldering, wires and the general level of construction. Therefore, poor contact or short circuits may occur inside the speakers, which will interfere with the entire electrical circuit, as a result of which extraneous noise may appear in the headphones.

The speakers must be turned off completely, and not just turned off their power.

If completely disconnecting the speakers from the computer did not help eliminate the noise in the headphones, proceed to the next troubleshooting step.

Lack of grounding is the most common cause of noise in headphones when connected to a computer

For some reason unknown to me, sockets in many homes are not grounded. In general, this is not so scary, traditional appliancesirons, heaters, filters and air conditioners are working normally. But it is worth connecting equipment that is very sensitive to the quality of the power supply to an ungrounded power grid, and problems immediately pop up.

A computer connected to an ungrounded outlet is a direct cost not only to noise in headphones, but also possible reason failure of the computer entirely due to exposure to static electricity.

The normal workaround for this problem is to ground the electrical outlet that the computer is connected to. But doing it yourself is not easy, if not impossible. To do this, you need to call an electrician, however, in this case, most likely, you will have to rewire the wiring throughout the apartment, and this is already a serious repair.

There is a simple way to check if grounding will really help eliminate noise from the headphones - to throw a wire from the computer to the battery.

You need to take the usual copper wire small section, on both sides with bare contacts. Lean one end against the computer case (preferably against the back wall), and the other against the battery. Leaning the wire against the painted part of the battery is useless, you need to lean against the metal of the battery, so you have to look for such a place. Bare metal can usually be found on the back of the battery.

If you did everything correctly, and the noise is gone or significantly reduced, then the matter is in grounding.

Remember: grounding through the battery cannot be considered permanent solution... Such grounding can lead to the complete failure of the entire computer; it is enough for your neighbor to ground serious equipment to the battery, as the computer, having received a powerful discharge of electricity on the case, will fail. This is just a test, nothing more.

But what if you know for sure that the sockets are grounded, and the test with the wire yielded nothing? We continue to search for a crack in the headphones.

Microphone noise is one of the many causes of noise in headphones

We have considered the possible sources of the noise problem in headphones, which relate to material interference, but now we are left with problems that relate to the configuration of computer equipment.

One of the most common causes of noise in headphones is noise from the microphone of a sound card.

Even if a microphone is not connected to your sound card, noise may be generated from the microphone jack.

In order to test this hypothesis, you need to go to the sound volume settings of your sound card, find the slider that adjusts the microphone volume level and reduce it to zero. Or, if there is such a possibility, turn off the sound from the microphone altogether.

If the reason for the noise in the headphones was the microphone input, then muting the sound from it should completely correct the situation.

In order to get to the microphone volume settings, open the control panel, find the item "Equipment and Sound" and go to it.

Now find the item "Sound" and go to it.

In the sound settings window go to the tab "Record", then find the active microphone (in my case, this is the Sound Blaster ZxR microphone), select it and click on the button "Properties" in the lower right corner.

In the new window find the tab "Levels", and either move the microphone volume slider to the maximum left until its value reaches zero, or click on the blue speaker icon to the right of the volume indicator. A red crossed-out mark should appear next to the speaker. This icon will indicate that the microphone is completely disabled in the system. It is preferable to turn it off, and not just to lower the volume level.

One type of problem with a microphone input, or the microphone itself, is its high sensitivity. This problem can be solved by turning on the microphone noise canceling mode.

Almost all modern sound cards have such a mode. If you find out that the microphone is the cause of the crackling, but you need it, then try turning on the noise canceling mode if you have one. This should fix the problem.

A problem with the volume level of sound sources in the sound card may be causing hiss in the headphones

Not only can noise from the microphone cause hiss in the headphones, the same noise can also be generated from adjacent inputs on your sound card.

Depending on the model of the sound card, it may have additional inputs for connection additional equipment... They can have the following names:

1. What U Hear
2. Line in
3. S / PDIF

Any of them, under a certain set of circumstances, can become a source of interference. Just as you turned down the microphone volume, you need to reduce or completely mute the sound from all of these jacks.

To do this, go to the Windows Control Panel.

Then find the item there "Equipment and Sound".

Then click on the section "Sound".

In the new window, go to the "Playback" tab, select the active speakers (a device that plays sound in headphones in this moment) and click on the "Property" button.

Then I cannot take a screenshot, because in my case, the volume level of all inputs and outputs is controlled through special software that controls my Sound Blaster sound card, in your case, the tab will most likely be available "Levels", by going into which you can turn off all the inputs and outputs of your sound card.

To test, leave only the headphone output on, and all others possible outputs and the inputs mute or lower their volume to zero.

If the headphone hiss problem was at one of these points, it should disappear.

Volume level - paradoxical, but true, it can cause interference in headphones

In some cases, the volume level may cause interference to the headphones.

Sometimes it happens that the headphones have their own volume control, plus there is an additional volume control in Windows, and there is also a volume control in the application from which you are listening (game, player).

In order for any hardware that has its own hardware volume control to work well, you need to make sure that all software volume controls (especially the main volume slider in Windows) are set to 100%. And the final volume control is done with the hardware volume control.

To eliminate hiss, follow these steps:

1. Completely mute the sound in the headphones using the hardware control (buttons or knobs on the headphones themselves)
2. Set the volume in Windows to 100%
3. Set the volume in the app to 100%
4. Start gradually adding the volume on the headphones and bring it to a comfortable level.

The fact is that the software volume controls artificially reduce the sound volume, after which you have to crank the volume in the headphones to the maximum in order to listen to it at a comfortable level. However, for any technique, be it headphones, speakers or a car engine, long work at the limit of the possible is extremely detrimental to the characteristics and properties of the unit.

When you set the hardware to the maximum volume on the headphones, you amplify all the noise that comes from the computer, plus you add distortion that appears in the headphones themselves on maximum level sound.

Therefore, you need to adjust the volume using the method that I indicated in order to minimize possible distortion and noise from the headphones themselves, as well as remove the artificial amplification of unwanted noise.

Greetings!
Chinese electronics manufacturers never cease to amaze. But the quality of the devices is still a frank lottery!

In the vastness of Aliexpress, you can find a variety of mobile phones from unnamed Chinese manufacturers. An example is the Servo devices - in fact, this is a typical no-name (unnamed manufacturer), with the appropriate quality.

However, the pipes of this manufacturer "catch" with their functionality. For example, in the line of this "manufacturer" there are devices that can work with 4 SIM cards simultaneously in standby mode, secure phones (in fact, this is not the case), a power bank phone, etc. This is what captivates in Chinese creations, because it is not always realistic to find a similar solution among first-tier manufacturers.

However, after the acquisition, indignation arises, as well as outright disappointment with the quality, and regardless of the presence or absence of a stud on a typical Chinese device. In some cases, the microphone is objectionable (the interlocutors do not hear you well), and in some cases, background noise is transmitted to the line along with your voice.

This noise is a pick-up on the sound path from the receiving-transmitting antenna of the device. Famous brands do not allow such blunders, and this problem can hardly arise even in the cheapest "dialers". But in Chinese devices, this problem pops up to this day. Flaws in design, poor assembly, savings on components - in fact, none of this matters.

The owner first of all needs to understand that this problem is of a hardware nature. You may wonder why this noise does not always occur? The fact is that the power of the transmitter varies, and depends on how far the device is from the base station at a given moment, what is the level of its signal.

What to do in this situation? Unambiguously send the phone back to the seller, because no firmware can solve this problem. This is clearly a hardware problem that can hardly be solved at home. It is possible that the screen is there, but it is poorly soldered. But do not rush to arm yourself with a soldering iron and correct this defect, because the components of modern devices are so close to each other that the "invasion" ordinary soldering iron into the circuit of the apparatus is fraught with serious consequences. If repaired, then only with the use of special. equipment.

It is sad that Chinese manufacturers have concentrated on smartphones and have completely forgotten the good old push-button devices, moreover, with support for multiple SIM cards.

It was the Chinese manufacturers that once presented multi-SIM devices, because it is surprising that now it is so difficult to find a worthy solution that would support the work with three or four SIM cards.

I really hope this is temporary. Smartphones to this day have not offered a worthy replacement - not only does the operating time leave much to be desired, and there are practically no representatives who could offer support for three .. four SIM cards.