# order and degree

The `order`

and `degree`

parameters appear in `audioBlockFormat`

only for the 'HOA' typeDefinition.

The meaning of order and degree values is based on the following definition of real-valued spherical harmonics:

Where:

- is the order value, is the degree value, is azimuth, and is elevation
- is the normalization parameter for the given order and degree
- is the associated Legendre function for the given order and degree.

The associated Legendre functions are defined as:

with the Legendre polynomial and without the Condon-Shortley phase term .