Patent ID: 9668079
Date: 2017-05-30
CPC Classifications: G10L,H04S

Claim:
1. A method for generating from a coefficient domain representation of HOA signals a mixed spatial/coefficient domain representation of said HOA signals, wherein a number of said HOA signals can be variable over time in successive coefficient frames, said method comprising: separating a vector of HOA coefficient domain signals into a first vector of coefficient domain signals having a constant number of HOA coefficients and a second vector of coefficient domain signals having over time a variable number of HOA coefficients; transforming said first vector of coefficient domain signals to a corresponding vector of spatial domain signals by multiplying said vector of coefficient domain signals with an inverse of a transform matrix; PCM encoding said vector of spatial domain signals to determine a vector of PCM encoded spatial domain signals; normalizing said second vector of coefficient domain signals by a normalization factor, wherein said normalizing is an adaptive normalization with respect to a current value range of HOA coefficients of said second vector of coefficient domain signals and in said normalizing an available value range for HOA coefficients of the vector is not exceeded, and in which normalization a uniformly continuous transition function is applied to the coefficients of said second vector, which thereafter represents a current second vector, in order to continuously change a first gain within that current second vector from a second gain in a previous second vector to a third gain in a following second vector, and which normalization provides side information for a corresponding decoder-side de-normalization; PCM encoding said current second vector of normalized coefficient domain signals to determine a vector of PCM encoded and normalized coefficient domain signals; multiplexing said vector of PCM encoded spatial domain signals and said vector of PCM encoded and normalized coefficient domain signals.