Method and apparatus for generating from a coefficient domain representation of HOA signals a mixed spatial / coefficient domain representation of said HOA signals

Abstract

Abstract There are two representations for Higher Order Ambisonics denoted HOA: spatial domain and coefficient domain. The invention provides a method and apparatus for decoding an 5 HOA representation, said decoding comprising: de- multiplexing multiplexed vector of PCM encoded spatial domain signals and vector of PCM encoded and normalized coefficient domain signals; transforming the vector of PCM encoded spatial domain signals to a corresponding vector of 10 coefficient domain signals by multiplying the vector of PCM encoded spatial domain signals with a transform matrix; de- normalizing the vector of PCM encoded and normalized coefficient domain signals; combining the vector of coefficient domain signals and the vector of de-normalized 15 coefficient domain signals to determine a combined vector of HOA coefficient domain signals that can have a variable number of HOA coefficients. Fig.3 20 Abstract 5 10 15 20 26 22 03 14 21 A ug 2 02 6 A b s t r a c t 2 0 2 6 2 2 0 3 1 4 2 1 A u g 2 0 2 6 5 1 0 1 5 1 / 4 Encoder Decoder d To W PCM w' HOA DE- w' To d' Spatial MUX Coefficient Domain Coding MUX Domain 11 12 13 14 15 Fig. 1 Encoder 1 / Decoder II || II || d Separate d Combine PCM d' HOA X Coding X HOA Coefficients d'2 26 27 d"2 Coefficients 28 29 20 d"2 d"2 d'1 d To W1 PCM w1' HOA w'1 ToDE-Spatial MUX Domain Coding MUX Coefficient Domain 21 22 23 24 25 Fig. 2 e Encoder Decoder D Separate D Adaptive D' PCM Adaptive D"2 Combine D' HOA Norma- De-Norma- HOA Coefficients lization Coding lization Coefficients 30 36 37 d"2 38 39 D"2 D'1 D To W1 PCM W'1 HOA DE- W'1 To Spatial MUX Coefficient Domain Coding MUX Domain 31 32 33 34 35 Fig. 3 20 26 22 03 14 21 A ug 2 02 6 1 / 4 2 0 2 6 2 2 0 3 1 4 2 1 A u g 2 0 2 6 d W P C M D E - d ' C o e f f i c i e n t D o m a i n 1 1 1 2 1 3 1 4 1 5 E n c o d e r 1 / D e c o d e r d C o m b i n e d ' C o d i n g 2 9 d T o W 1 w 1 ' H O A T o C o d i n g M U X D o m a i n 2 1 2 2 2 3 2 4 2 5 F i g . 2 e E n c o d e r D e c o d e r D S e p a r a t e D A d a p t i v e D ' P C M A d a p t i v e D " 2 C o m b i n e D ' H O A N o r m a - D e - N o r m a - H O A C o e f f i c i e n t s l i z a t i o n C o d i n g l i z a t i o n C o e f f i c i e n t s 3 0 3 6 3 7 d " 2 3 8 3 9 D " 2 D ' 1 D T o W P C M W ' 1 H O A D E - W ' 1 T o S p a t i a l M U X C o e f f i c i e n t C o d i n g M U X D o m a i n D o m a i n 3 1 3 2 3 3 3 4 3 5 F i g . 3

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