What Is The "Signal-To-Noise Ratio"
Sales Enginner: Grace Gao
Email : grace@bri-elec.com
WhatsApp: 0086-199 2997 5286
Classification Of Signal-To-Noise Ratio
The signal-to-noise ratio (SNR) is one of the main technical indexes to measure the reliability of communication quality. Besides the communication SNR, the concept of SNR also exists in other fields.
Communication signal-to-noise ratio:
In modulated signal transmission, the signal-to-noise ratio generally refers to the ratio of the average power of the carrier signal at the channel output end, that is, the input end of the receiver, to the average power of the noise in the channel, which can be called the carrier-to-noise ratio. In analog communication systems, the signal-to-noise ratio generally refers to the ratio of the average power of the signal at the output end of the demodulator of the communication terminal to the average power of the noise. In digital communication systems, the signal-to-noise ratio generally refers to the ratio of the average signal energy of each digital waveform (bit) at the output end of the terminal's digital demodulator or decoder to the noise power in the unit frequency band, also known as normalization. Normalized signal-to-noise ratio or energy signal-to-noise ratio is a commonly used indicator.
Audio signal-to-noise ratio:
Audio signal-to-noise ratio refers to the ratio of normal sound signal intensity to noise signal intensity when played by audio equipment. When the signal-to-noise ratio is low, the noise is serious when small signals are input, seriously affecting the sound quality.
Image signal-to-noise ratio:
The signal-to-noise ratio of an image, like the image clarity, is an important indicator of image quality. The signal-to-noise ratio of an image refers to the ratio of the size of the video signal to the size of the noise signal. The larger the signal-to-noise ratio, the cleaner the image will be. No noise interference (shown as "grains" and "snowflakes") will be seen, and it will look very comfortable; if the signal-to-noise ratio is small, the screen may be full of Snowflakes seriously affect the image.
Web page signal-to-noise ratio:
Signal-to-noise ratio was originally a concept in the field of electroacoustics. It refers to the ratio between the maximum undistorted sound signal intensity produced by a sound source and the simultaneous noise intensity. This principle also exists in web page optimization. Search When the engine crawls the page, it mainly captures the text content after removing the html tag. This part of the content can be considered as an undistorted sound signal, while the part of the html tag content generated at the same time can be considered as noise. Therefore, the signal-to-noise ratio of a web page can be understood as the ratio of the text content in the web page to the html tag content generated by generating these texts. The higher the signal-to-noise ratio of a webpage, it means that there is relatively more pure text content on the page, and it is easier for search engines to crawl the page.
Signal-to-noise ratio (SNR) refers to the ratio of signal to noise in the system, often expressed in decibels dB. The definition of decibel is: "The common logarithm of the ratio of two similar power quantities or quantities comparable to power multiplied by 10 is equal to 1 hour difference”. Signals refer to electronic signals from outside the device that need to be processed by the device. Noise refers to irregular additional signals that do not exist in the original signal generated after passing through the equipment. This signal is related to the environment and does not change with the change of the original signal. There are also additional signals that do not exist in the original signal generated by the device, as well as "distortion". Distortion and noise are actually related to a certain extent. The difference between the two is that distortion is regular, while noise is irregular.
Sales Engineer:Grace Gao
Email:grace@bri-elec.com
WhatsAPP: 0086-199 2997 5286
