Decibel

The decibel module contains basic functions for decibel arithmetic.

acoustics.decibel.dbsum(levels, axis=None)

Energetic summation of levels.

Parameters:

• levels – Sequence of levels.
• axis – Axis over which to perform the operation.

\[L_{sum} = 10 \log_{10}{\sum_{i=0}^n{10^{L/10}}}\]

acoustics.decibel.dbmean(levels, axis=None)

Energetic average of levels.

Parameters:

• levels – Sequence of levels.
• axis – Axis over which to perform the operation.

\[L_{mean} = 10 \log_{10}{\frac{1}{n}\sum_{i=0}^n{10^{L/10}}}\]

acoustics.decibel.dbadd(a, b)

Energetic addition.

Parameters:

• a – Single level or sequence of levels.
• b – Single level or sequence of levels.

\[L_{a+b} = 10 \log_{10}{10^{L_b/10}+10^{L_a/10}}\]

Energetically adds b to a.

acoustics.decibel.dbsub(a, b)

Energetic subtraction.

Parameters:

• a – Single level or sequence of levels.
• b – Single level or sequence of levels.

\[L_{a-b} = 10 \log_{10}{10^{L_a/10}-10^{L_b/10}}\]

Energitally subtract b from a.

acoustics.decibel.dbmul(levels, f, axis=None)

Energetically add levels f times.

Parameters:

• levels – Sequence of levels.
• f – Multiplication factor f.
• axis – Axis over which to perform the operation.

\[L_{sum} = 10 \log_{10}{\sum_{i=0}^n{10^{L/10} \cdot f}}\]

acoustics.decibel.dbdiv(levels, f, axis=None)

Energetically divide levels f times.

Parameters:

• levels – Sequence of levels.
• f – Divider f.
• axis – Axis over which to perform the operation.

\[L_{sum} = 10 \log_{10}{\sum_{i=0}^n{10^{L/10} / f}}\]