What is Signal to Noise Ratio? โ€“ Formula, Application | New Topic [2024]

In this note, we are going to learn about a topic called โ€œWhat is Signal to Noise Ratio?โ€œ, also about its formula and applications as well. Welcome to Poly Notes Hub, a leading destination for engineering notes for diploma and degree engineering students.

Author Name: Arun Paul.

What is Signal to Noise Ratio?

The Signal to Noise Ratio or SNR is a measurement used in science and engineering to determine how much noise has damaged a signal. It is defined as the power of a signal (meaningful information) divided by the power of background noise (unwanted signal). A greater SNR suggests that the signal is cleaner and less distorted by noise.

Formula of SNR

Mathematically, Signal to Noise Ratio formula is expressed as โ€“

SNR = (Psignal/Pnoise)


  • Psignal = Average power of the signal
  • Pnoise = Average power of the noise.

The SNR also can be represented in decibel or dB by using the formula โ€“


Applications of SNR

Here are we listed some uses of SNR โ€“

  1. Used in audio engineering.
  2. Used in communication systems.
  3. Used in scientific measurements.
  4. Used in medical imaging, astronomy, and photography.
Share To:

Leave a Reply

Your email address will not be published. Required fields are marked *