METHOD AND DEVICE FOR DETERMINING THE LEAST FULL NUMBER OF BITS REQUIRED FOR SUBMISSION OF DIFFERENTIATED VALUES OF EFFICIENCY COEFFICIENTS FOR COMPRESSION OF REPRESENTATION OF HOA DATA

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)”�.