Noise measurement

In acoustics, noise measurement can be for the purpose of measuring environmental noise, or part of a test procedure using white noise, or some other specialised form of test signal. In audio systems and broadcasting specific methods are used to obtain subjectively valid results in order that different devices and signal paths may be compared regardless of the differing spectral distribution and temporal properties of the noise that they generate. In particular, the ITU-R 468 noise weighting was devised specifically for this purpose, and is widely used for professional audio and broadcast measurements.

Standards

There are a number of standards for noise measurement, each with a different goal or focus, including:

Standard:ITU-R BS 468 widely used in Broadcasting and professional Audio.
Standard:IEC A-weighting is widely used in Environmental Noise measurement.
Standard:CCIR recommendation 468-4 is now maintained as ITU-R BS 468
Standard:CCITT 0.41 refers to 'Psophometric weighting' used on telephone circuits.
Standard:CCITT P53 is now continued as CCITT0.41
Standard:BS 6402:1983 specifies Personal sound exposure meters.
Standard:BS 3539:1968 specifies Sound level meters for motor vehicle noise.
Standard:BSEN 60651 supersedes BS 5969:1981 Sound level meters

External links

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Noise (physics and telecommunications)

General	Acoustic quieting Distortion Noise cancellation Noise control Noise measurement Noise power Noise reduction Noise temperature Phase distortion

Noise in...	Audio Buildings Electronics Environment Government regulation Human health Images Radio Rooms Ships Sound masking Transportation Video

Class of noise	Additive white Gaussian noise (AWGN) Atmospheric noise Background noise Brownian noise Burst noise Cosmic noise Flicker noise Gaussian noise Grey noise Jitter Johnson–Nyquist noise (thermal noise) Pink noise Quantization error (or q. noise) Shot noise White noise Coherent noise Value noise Gradient noise Worley noise

Engineering terms	Channel noise level Circuit noise level Effective input noise temperature Equivalent noise resistance Equivalent pulse code modulation noise Impulse noise (audio) Noise figure Noise floor Noise shaping Noise spectral density Noise, vibration, and harshness (NVH) Phase noise Pseudorandom noise Statistical noise

Ratios	Carrier-to-noise ratio (C/N) Carrier-to-receiver noise density (C/kT) dBrnC E_b/N₀ (energy per bit to noise density) E_s/N₀ (energy per symbol to noise density) Modulation error ratio (MER) Signal, noise and distortion (SINAD) Signal-to-interference ratio (S/I) Signal-to-noise ratio (S/N, SNR) Signal-to-noise ratio (imaging) Signal to noise plus interference (SNIR) Signal-to-quantization-noise ratio (SQNR)

Related topics	List of noise topics Acoustics Colors of noise Interference (communication) Noise generator Radio noise source Spectrum analyzer Thermal radiation

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Noise measurement

Standards

See also

External links