“signal-to-noise ratio”的概念、定义、翻译、参考文献-科学参考

signal-to-noise ratio

Physics

A ratio of importance in electrical communication, especially in radio and television. Noise in this context refers to electrical disturbances that cause unwanted interference (crackling, hum, etc.) in radio and spoil the picture in television with ‘snow-storms’. Some electrical noise is caused by external electrical equipment, such as electric motors. In addition, fluctuations in electric current occur because the current consists of electrons, which have random movements. The signal-to-noise ratio of a signal is defined as the ratio of the amplitude of the signal to the mean amplitude of the noise.

Astronomy

See sensitivity.

Computer

The ratio of the signal power to the noise power in a physical transmission channel; it is often measured in decibels (dB). The definition is best applied to statistically well-behaved noise such as white Gaussian noise. A more useful definition, frequently employed when small signals are needed, is signal-plus-noise to noise ratio. This has the benefit of being easy to measure. With large signals and low-noise circuits the two definitions are virtually identical. See also channel coding theorem.

Electronics and Electrical Engineering

At any point in an electronic circuit, device, or transmission system, the ratio of one parameter of a desired signal to the same or a corresponding parameter of the noise. In broadcast communication the signal-to-noise ratio is often quoted in decibels.

单词	signal-to-noise ratio
释义	signal-to-noise ratio Physics A ratio of importance in electrical communication, especially in radio and television. Noise in this context refers to electrical disturbances that cause unwanted interference (crackling, hum, etc.) in radio and spoil the picture in television with ‘snow-storms’. Some electrical noise is caused by external electrical equipment, such as electric motors. In addition, fluctuations in electric current occur because the current consists of electrons, which have random movements. The signal-to-noise ratio of a signal is defined as the ratio of the amplitude of the signal to the mean amplitude of the noise. Astronomy See sensitivity. Computer The ratio of the signal power to the noise power in a physical transmission channel; it is often measured in decibels (dB). The definition is best applied to statistically well-behaved noise such as white Gaussian noise. A more useful definition, frequently employed when small signals are needed, is signal-plus-noise to noise ratio. This has the benefit of being easy to measure. With large signals and low-noise circuits the two definitions are virtually identical. See also channel coding theorem. Electronics and Electrical Engineering At any point in an electronic circuit, device, or transmission system, the ratio of one parameter of a desired signal to the same or a corresponding parameter of the noise. In broadcast communication the signal-to-noise ratio is often quoted in decibels.
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