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What Is Signal-to-Noise Ratio and Why Does It Matter?

affect the overall sound quality.

You may have come across product specifications or even read reviews about signal-to-noise ratio. Often abbreviated as SNR or S/N, this specification may seem cryptic to the average consumer. While the math behind the signal-to-noise ratio is technical, the concept is not, the value of the signal-to-noise ratio affects the overall sound quality of the system.

Signal-to-noise ratio explained

The signal-to-noise ratio compares the signal power level to the noise power level. It is usually expressed as a measure of decibels (dB). A higher number usually means better specification because there is more useful information (signal) than unwanted data (noise).

For example, if the S/N ratio of an audio component is 100 dB, it means that the audio signal level is 100 dB higher than the noise level. Therefore, a signal-to-noise ratio of 100 dB is significantly better than a specification of 70 dB or lower.

Bernd Schnack/Getty Images

For example, let’s say you’re talking to a friend in the kitchen who also has a particularly noisy refrigerator. Suppose a refrigerator produces a 50-decibel hum, consider it noise because it keeps the contents cool. If the friend you’re talking to is whispering at 30 decibels (think of it as a signal), you won’t hear a word because the hum of the refrigerator dominates your friend’s speech.

You can get your friend to speak loudly, but even at 60 decibels, you may have to ask him to repeat things. Talking at 90 decibels may feel more like a scream, but at least the words are heard and understood. That’s the idea behind the signal-to-noise ratio.

Why is the signal-to-noise ratio important?

You can find SNR specifications for many audio-related products, including speakers, telephones (wireless or otherwise), headphones, microphones, amplifiers, receivers, turntables, radios, CD/DVD/media players, PC cards. Audio systems, smartphones, tablets, etc. However, not all manufacturers disclose this value lightly.

The actual noise is usually characterized by a white or electronic or static hiss or a muffled or vibrating hum. Set the speaker volume to maximum when nothing is playing; if you hear hiss, that’s sound, often referred to as “background noise.” Like the refrigerator in the scene described above, this soundproof floor is always there.

As long as the input signal is strong and well above the noise floor, the audio will maintain excellent quality, which is the preferred type of signal-to-noise ratio for clear, accurate sound.

What about volume?

If the signal gets weaker, you might think you need to turn up the volume to boost the output. Unfortunately, turning the volume up and down affects the background noise and signal. The music can get louder, but so can the underlying sound. You should only increase the signal strength of the source to achieve the desired effect. Some devices have hardware or software elements designed to improve the signal-to-noise ratio.

Unfortunately, all components, including cables, add some level of noise to the audio signal. The best components aim to keep background noise as low as possible to maximize the ratio. Analog devices such as amplifiers and turntables typically have a lower signal-to-noise ratio than digital devices.

The 8 Best JBL Speakers of 2022

Other considerations

Products with very low signal-to-noise ratios are definitely worth avoiding. However, the signal-to-noise ratio should not be used as the only measure of component sound quality. Also, for example, frequency response and harmonic distortion must be considered.

Content

What Is Signal-to-Noise Ratio and Why Does It Matter?

It impacts overall sound quality

You might have come across a listed product specification or even read a discussion about the signal-to-noise ratio. Often abbreviated as SNR or S/N, this specification can seem cryptic to the average consumer. However, while the math behind the signal-to-noise ratio is technical, the concept is not, and the signal-to-noise value can impact a system’s overall sound quality.

Signal-to-Noise Ratio Explained

A signal-to-noise ratio compares a level of signal power to a level of noise power. It’s most often expressed as a measurement of decibels (dB). Higher numbers generally mean a better specification since there’s more useful information (the signal) than unwanted data (the noise).

For example, when an audio component lists a signal-to-noise ratio of 100 dB, it means that the audio signal level is 100 dB higher than the noise level. Therefore, a signal-to-noise ratio specification of 100 dB is considerably better than one that is 70 dB or less.

Bernd Schunack / Getty Images 
For illustration, let’s say that you’re having a conversation with a friend in a kitchen who also happens to have a particularly loud refrigerator. Let’s also say that the refrigerator generates 50 dB of hum—consider this the noise—as it keeps its contents cool. If the friend you’re speaking with is whispering at 30 dB—consider this the signal—you won’t be able to hear a single word because the refrigerator’s hum overpowers your friend’s speech.

You may ask your friend to speak louder, but even at 60 dB, you may still need to ask them to repeat things. Speaking at 90 dB may seem more like a shouting match, but at least words will be heard and understood. That’s the idea behind the signal-to-noise ratio.

Why Signal-to-Noise Ratio Is Important

You can find specifications for signal-to-noise ratio can in many products that deal with audio, including speakers, telephones (wireless or otherwise), headphones, microphones, amplifiers, receivers, turntables, radios, CD/DVD/media players, PC sound cards, smartphones, tablets, and more. However, not all manufacturers make this value readily known.

The actual noise is often characterized as a white or electronic hiss or static or a low or vibrating hum. Crank the volume of your speakers all the way up while nothing is playing; if you hear a hiss, that’s the noise, which is often referred to as a “noise floor.” Just like the refrigerator in the previously described scenario, this noise floor is always there.

As long as the incoming signal is strong and well above the noise floor, the audio will maintain a higher quality, which is the kind of signal-to-noise ratio preferred for a clear and accurate sound.

What About Volume?

If a signal happens to be weak, you might think you need to increase the volume to boost the output. Unfortunately, adjusting the volume up and down affects both the noise floor and the signal. The music may get louder, but so will the underlying noise. You would have to boost only the signal strength of the source to achieve the desired effect. Some devices feature hardware or software elements that are designed to improve the signal-to-noise ratio.

Unfortunately, all components, even cables, add some level of noise to an audio signal. The best components are designed to keep the noise floor as low as possible to maximize the ratio. Analog devices, such as amplifiers and turntables generally have a lower signal-to-noise ratio than digital devices. 

The 8 Best JBL Speakers of 2022
Other Considerations

It is definitely worth avoiding products with very poor signal-to-noise ratios. However, the signal-to-noise ratio should not be used as the only specification to measure the sound quality of components. Frequency response and harmonic distortion, for example, should also be taken into consideration.

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Tài Chính Kinh Doanh

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