Method and apparatus for determining a minimum integer number of bits required to represent a non-differential gain value for compression of a HOA data frame representation

摘要

When compressing an HOA data frame representation, a gain control (15, 151) is applied for each channel signal before it is perceptually encoded (16). The gain values are transferred in a differential manner as side information. However, for starting decoding of such streamed compressed HOA data frame representation absolute gain values are required, which should be coded with a minimum number of bits. For determining such lowest integer number (² e ) of bits the HOA data frame representation ( C ( k )) is rendered in spatial domain to virtual loudspeaker signals lying on a unit sphere, followed by normalisation of the HOA data frame representation ( C ( k )). Then the lowest integer number of bits is set to ² e = ”Œlog 2 (”Œlog 2 ( K MAX · 0 )”� + 1)”�.