What does OB stand for?

Octave Band

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

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Samples in periodicals archive:

So, from simple baseline surveys to full 1/3rd octave band analysis, all measurements can be performed quickly and easily through a simple, intuitive menu driven system.

Environmental noise in colour

The ISO standard goes on to define ground attenuation for each octave band utilizing a ground factor (G) for each region depending on how reflective or absorptive it is.

Propagation Modeling Parameters for Wind Power Projects

Octave Band Center Frequency, Hz 63 125 250 500 1000 2000 6 20 14 9 5 2 1 8 18 12 7 3 1 0 10 16 11 6 2 1 0 12 14 9 5 2 1 0 16 12 7 3 1 0 0 20 10 6 2 1 0 0 24 9 5 2 1 0 0 28 8 4 1 0 0 0 32 7 3 1 0 0 0 36 6 3 1 0 0 0 48 5 2 1 0 0 0 72 3 1 0 0 0 0 Table 2.

Experimental investigation of reflection of airborne noise at duct ...

The meter also includes 1:1 Octave Band Filters, which support the selection of hearing protection (PPE), using Cirrus' Deaf Defier3 software which is supplied as standard.

Easy to use kit for noise measurement

The output from the system is the one third octave band and discrete frequency sound levels transmitted from the duct to the measurement room.

Qualification of fan-generated duct rumble noise--part 1: test ...

The uncertainty in the measured one-third octave band sound level was determined to be [+ or -]1.

Qualification of fan-generated duct rumble noise--part 2: results

The facility was primarily used for testing residential and small unitary condensing units to ARI 270, which currently only includes measurements in the 100 Hz one-third octave band and above.

The use of numerical acoustics to solve classic acoustics problems at ...

The frequency-specific results for the incident and transmitted powers determined by Equations 8 and 9 were then summed in each one-third octave band before using Equation 1 to determine the transmission loss.

Using numerical acoustics to predict the attenuation of HVAC plenums