Noise pollution: how to protect yourself? Permissible noise standards, or how many decibels in...? Signal to noise ratio 80 dB

Main reasons for low noise performance

The main reasons for high noise levels in signaling systems are:

If the spectrum of the desired signal differs from the spectrum of the noise, the signal-to-noise ratio can be improved by limiting the system bandwidth.

To improve the noise characteristics of complex systems, electromagnetic compatibility methods are used.

Measurement

In audio engineering, the signal-to-noise ratio is determined by measuring the noise voltage and signal at the output of an amplifier or other sound-reproducing device with an rms millivoltmeter or spectrum analyzer. Modern amplifiers and other high-quality audio equipment have a signal-to-noise ratio of about 100-120 dB.

In systems with higher requirements, indirect methods for measuring the signal-to-noise ratio are used, implemented on specialized equipment.

In music

The signal-to-noise ratio is a parameter of an amplifier for active speakers; it shows how much noise the amplifier makes (from 60 to 135.5 dB) if, in the absence of a signal, the volume control is turned to maximum. The higher the signal-to-noise value, the clearer the sound the speakers provide. It is desirable that this parameter be at least 75 dB; for powerful speakers with high-end sound, at least 90 dB.

In the video

see also

Wikimedia Foundation. 2010.

• Barricades (software)
• Larynx

See what “signal-to-noise ratio” is in other dictionaries:

Signal-to-noise ratio- Signal to Noise Ratio (SNR, Signal to Noise Ratio) is a dimensionless quantity equal to the ratio of the useful signal power to the noise power. Usually expressed in decibels. The higher this ratio, the less noticeable the noise. where P is the average... ... Wikipedia

signal-to-noise ratio- The ratio of the amplitude (or energy) of the signal created by a defect in a material to the root mean square value of the signal (or energy) of the noise. [Non-destructive testing system. Types (methods) and technology of non-destructive testing. Terms and Definitions …

signal-to-noise ratio- - [Ya.N.Luginsky, M.S.Fezi Zhilinskaya, Yu.S.Kabirov. English-Russian dictionary of electrical engineering and power engineering, Moscow, 1999] Topics of electrical engineering, basic concepts EN signal to noise ratioS/N ratio ... Technical Translator's Guide

signal-to-noise ratio- (ITU T G.691; ITU T G.983.2 G.991.2). Topics: telecommunications, basic concepts EN signal to noise ratioSNR... Technical Translator's Guide

Signal to noise ratio G/s d- a value characterizing the change in the gradient G against the background of the optical density of an equally exposed radiographic image. Source …

signal-to-noise ratio- 3.4 signal-to-noise ratio: The ratio of the ultrasonic signal level to the “background” noise level, expressed in decibels (dB). Source … Dictionary-reference book of terms of normative and technical documentation

signal-to-noise ratio- signalo ir triukšmo santykis statusas T sritis automatika atitikmenys: engl. signal to noise ratio vok. Signal/Rausch Verhältnis, n rus. signal-to-noise ratio, n pranc. rapport signal/bruit, m … Automatikos terminų žodynas

signal-to-noise ratio in magnetic testing Technical Translator's Guide

signal-to-noise ratio in magnetic non-destructive testing- signal-to-noise ratio The ratio of the peak value of the magnetic transducer signal, caused by a change in the measured characteristic of the magnetic field, to the root mean square value of the noise amplitude caused by the influence of interfering parameters... ... Technical Translator's Guide

integrated circuit signal-to-noise ratio- signal-to-noise ratio The ratio of the effective value of the output voltage of an integrated circuit containing only low-frequency components corresponding to the frequencies of the modulating voltage to the effective value of the output voltage at ... Technical Translator's Guide

In the last article we touched on the topic of cleaning ears with cotton swabs. It turned out that, despite the prevalence of such a procedure, self-cleaning of the ears can lead to perforation (rupture) of the eardrum and a significant decrease in hearing, up to complete deafness. However, improper ear cleaning is not the only thing that can damage our hearing. Excessive noise that exceeds sanitary standards, as well as barotrauma (injuries associated with pressure changes) can also lead to hearing loss.

To have an idea of ​​the danger that noise poses to hearing, it is necessary to familiarize yourself with the permissible noise standards for different times of the day, as well as find out what noise level in decibels certain sounds produce. In this way, you can begin to understand what is safe for your hearing and what is dangerous. And with understanding comes the ability to avoid the harmful effects of sound on hearing.

According to sanitary standards, the permissible noise level, which does not harm hearing even with prolonged exposure to the hearing aid, is considered to be: 55 decibels (dB) during the daytime and 40 decibels (dB) at night. Such values ​​are normal for our ear, but, unfortunately, they are very often violated, especially within large cities.

Noise level in decibels (dB)

Indeed, the normal noise level is often significantly exceeded. Here are examples of just some of the sounds we encounter in our lives and how many decibels (dB) these sounds actually contain:

• Spoken speech ranges from 45 decibels (dB) to 60 decibels (dB), depending on the volume of the voice;
• Car horn reaches 120 decibels (dB);
• Heavy traffic noise – up to 80 decibels (dB);
• Baby crying – 80 decibels (dB);
• Operation noise of various office equipment, vacuum cleaner - 80 decibels (dB);
• Noise of a running motorcycle, train - 90 decibels (dB);
• The sound of dance music in a nightclub is 110 decibels (dB));
• Airplane noise - 140 decibels (dB);
• Noise from repair work – up to 100 decibels (dB);
• Cooking on a stove - 40 decibels (dB);
• Forest noise from 10 to 24 decibels (dB);
• Lethal noise level for humans, explosion sound - 200 decibels (dB)).

As you can see, most of the noises that we encounter literally every day significantly exceed the permissible threshold. And these are just natural noises that we cannot do anything about. But there is also noise from TV and loud music, to which we expose our hearing aids. And with our own hands we cause enormous harm to our hearing.

What noise level is harmful?

If the noise level reaches 70-90 decibels (dB) and continues for quite a long time, then such noise with prolonged exposure can lead to diseases of the central nervous system. And prolonged exposure to noise levels of more than 100 decibels (dB) can lead to significant hearing loss, including complete deafness. Therefore, we get much more harm from loud music than pleasure and benefit.

What happens to hearing when exposed to noise?

Aggressive and prolonged noise exposure to the hearing aid can lead to perforation (rupture) of the eardrum. The consequence of this is decreased hearing and, as an extreme case, complete deafness. And although perforation (rupture) of the eardrum is a reversible disease (i.e., the eardrum can recover), the recovery process is long and depends on the severity of the perforation. In any case, treatment of perforation of the eardrum is carried out under the supervision of a doctor, who chooses a treatment regimen after examination.

The ratio of the clean audio signal to the noise generated by the device itself.

The higher the value (in dB), the better.

The Sound Blaster X-Fi sound card has a signal-to-noise value of 118 dB.

Most audio codecs have 80-95 dB.

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An amplifier is an indispensable attribute of high-quality sound in a car. And not just because of the power. First of all, the power reserve ensures music playback with minimal distortion. Therefore, if you strive for high-quality and, of course, loud sound, you cannot do without an amplifier.

Amplifiers: let the “heart” of your acoustics sound louder!

There is an interesting comparison among car owners: the “brain” of a car speaker system is considered to be a high-quality radio or multimedia, and the “heart” is the best amplifiers.

Car audio amplifiers- These are devices designed to improve sound quality, increasing its power, purity, spectrum and strength. At the output after such processing, you can hear a high-quality audio recording that initially seemed “dull” and “lifeless.”

These devices work as follows: the signal comes from the standard radio to the speakers or subwoofer, then passes through an amplifier and only then does it reach the ears of the car owner and his passengers. The class of amplifiers will depend on how much the sound signal is “cut off”:

· analog – provide an output signal with a minimum amount of distortion and do not reduce the sound amplitude;

· digital – pass signals through filters, preserve the range and pulse width, and allow even the lowest frequencies to be heard.

How to choose amplifiers for car audio?

The primary characteristic that consumers who want to pay attention to buy amplifiers, the price is considered. It depends not only on the brand, but also on the functionality of the device. For example, expensive models additionally provide an equalizer that is responsible for adjusting the range. Devices often have bass controls that provide sound quality for rhythmic and loud melodies.

Be sure to pay attention to the dimensions. Compact amplifiers will not take up much space in the cabin and will be invisible to others. And modern design will make them an integral part of the interior.

And, of course, when choosing an amplifier, you need to familiarize yourself with its power. The higher this parameter, the higher quality the output sound will be. However, this may affect the amount of energy it consumes.

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