Specifications

EAW Smaart 6 Operation Manual Concepts, Glossary, and Bibliography

Propagation Delay: The time it takes for sound to travel from one place (typically a

loudspeaker) to another place (typically a microphone).

Reverberation Time: The amount of time required for audio energy introduced into a

system (typically a room) to diminish, or decay a specified number of decibels. Often

expressed as an RT60 value.

RT60: Reverberation time. The amount of time required for a system, typically a room,

to decay 60 decibels. (see Decay Rate)

Sampling Rate (SR): The number of data points measured per second used in the analog

to digital conversion process expressed in Hz.

Signal to Noise Ratio (S/N): The ratio of signal to noise level in a measurement. If the

S/N is too low, the noise overwhelms the measurement and renders it invalid.

Spectrograph: A three-dimensional plot, displayed in two dimensions with color

representing the third dimension (or z-axis). The spectrograph is a topographical rep-

resentation of the common waterfall display.

Spectrum: The frequency content of a given signal.

Speed of Sound: The speed of sound is dependent on the material of propagation, the

temperature and several other factors. Typical values for the speed of sound in air are

1120 ft/s, or 341.376 m/s. This is the value Smaart 6 uses to calculate distance equivalents

for time differences.

System Under Test (SUT): The system being tested by Smaart 6. This could be a

single device or an electroacoustic system such as speakers/amplifiers.

Time Window: The time constant (or effective time constant) of a measurement or

other process.

Time Constant (TC): TC = FFT size/SR

White Noise: A random (or pseudorandom) signal in which over a given averaging

period, each frequency has equal energy.