**W :** under Watt, see below

1 watt = 1 J/s = 1 N·m/s : base unit m^{2} kg s^{-3}

1 watt is equivalent to 1.341 x 10^{-3} Horsepower

A watt is also the power dissipated by a current of 1 Ampere flowing across a potential difference of 1 volt.

See also : Sound Power

See also : PCM and ADPCM.

See also : Sound Wave

For instance a sharp spike or impulse and a randomly varying continuous signal can have spectra that look almost identical, while their waveforms are completely different.

At 20 Hz the wavelength ≈ 17 m and at 20 kHz ≈ 17 mm, in air at 20 °C.

Frequency f, wavelength λ and wave velocity v are related by the formulae λ = v/f

It can be envisaged as the number of waves that exist over a specified distance (analogous to Frequency being the number of cycles or radians per unit time).

Similar to the Daily Personal Noise Exposure but calculated for a 40-hour week (five 8-hour days) instead of an 8-hour day.

See also : Leq - Equivalent Continuous Sound Level

W = m g, where W = weight, m = mass and g = acceleration (m/s

In everyday use the term weight nearly always means mass. In science weight is the Force due to Gravity and the units are Newtons.

**Weighted Sound Levels** under Frequency Weighted Sound Levels

Weighted Sound Reduction Index : Rw

Weighted Apparent Sound Reduction Index : R'w

Weighted Standardized Impact Sound Pressure Level : LnT,w

Weighted Standardized Impact Sound Pressure Level : L'nT,w

Weighted Standardized Field Level Difference : DnT,w

Similarly Hand arm and Whole Body measurements are frequency dependent. There are a range of human vibration networks or filters because measurements are made in 3-axis and the weightings for whole body measurements, seated, standing or lying down are different from the hand arm filters see the list below.

Related Terms :
Broadband Noise •
Narrowband Noise •
Pink Noise •
Random Noise

See also :
Constant Bandwidth •
Constant Percentage Bandwidths •
Octave Bands •
FFT- Fast Fourier Transform.

See also : Daily Exposure Levels • Maximum Transient Vibration Value • Vibration at Work Regulations • Vibration Dose Value

Related Terms :
Broadband Noise •
Narrowband Noise •
Pink Noise •
Random Noise •
White Noise

See also :
Constant Bandwidth •
Constant Percentage Bandwidths •
Octave Bands •
FFT- Fast Fourier Transform.

Related Terms : Apodization • Hanning Window • Rectangular Window

** a practical solution is to listen to the AC output of the sound level meter using earphones, or the audio recording feature included in some sound level meters like the B&K 2250