SNRverdi

SNRverdi, or SNR value, is a measure of signal quality that compares the power of a desired signal to the power of background noise within a system. It is widely used in telecommunications, audio engineering, and sensor applications to describe how clearly the useful signal can be distinguished from noise. The SNRverdi is commonly expressed in decibels (dB); the numerical ratio is S/N, while in dB it is 10 log10(S/N). For voltage-based measurements with a fixed impedance, SNR can also be expressed as 20 log10(Vs/Vn).

Measurement and interpretation: SNRverdi can be determined from measurements taken with instruments such as spectrum analyzers, receivers, or data acquisition systems. In digital communications, the SNRverdi directly affects the bit error rate; for a given modulation scheme, a higher SNRrier yields lower error probability. The required SNRverdi depends on the modulation, coding, and channel conditions, as well as tolerance for interference and distortion.

Typical ranges and context: In consumer audio equipment, SNR values often exceed 90 dB, reflecting a low level of audible noise relative to the signal. In radio or wireless links, systems are designed to maintain adequate SNR under fading and interference, often resulting in target values that provide reliable performance.

Relation to noise and bandwidth: The noise floor is influenced by thermal noise, the receiver’s noise figure, and external interference. For a thermal-noise-limited system, the noise power over bandwidth B is approximately Pn = kT B, yielding a baseline around -174 dBm/Hz plus 10 log10(B).

See also: Signal-to-noise ratio, decibel, noise figure, modulation.