PATENT CLAIM ANALYSIS

Application Number: 15771084
Application Type: Utility
Filing Date: 2018-04
Publication Date: 2018-11
Patent Classification: ["704", "500000"]

Abstract:
For converting a channel-based 3D audio signal to a higher-order Ambisonics HOA audio signal, the channel-based 3D audio signal is transformed ( 21 ) from time domain to frequency domain. A primary ambient decomposition ( 22 ) is carried out for three-channel triplets of blocks of the domain channel-based 3D audio signal, wherein directional signals and ambient signals are provided ( 37 ) for each triplet. From the directional signals directional information of a total directional signal for each triple is derived ( 23 ). That total directional signal is HOA encoded ( 25 ) according to the derived directions, and ambient signals are HOA encoded ( 24 ) according to channel positions. The HOA coefficients of the HOA encoded directional signal and the HOA coefficients of the HOA encoded ambient signal are superimposed ( 27 ) in order to obtain a HOA coefficients signal for the channel-based 3D audio signal, followed by a transformation ( 26 ) into time domain.

Claim (Index 19):
The apparatus of  claim 2 , wherein said processor is configured to determine primary ambient decomposition including by:\n calculating, for a block (X m [i]) of multichannel spectral bins, signal powers P m [i] and inter-channel cross correlations c mn [i] between different channel signals, wherein 1\u2264m\u22643 denotes a specific triplet after triangulation, m,n denote two different channels and i denotes a frequency bin index; calculating a directional signal power P S m \ue8a0 [ i ] = | c mn 1 \ue8a0 [ i ] || c mn 2 \ue8a0 [ i ] | | c n 1 \ue89e n 2 \ue8a0 [ i ] | , m\u2260n 1 , m\u2260n 2 , n 1 \u2260n 2 , 1\u2264m, n 1 , n 2 \u22643, wherein c n 1 n 2 [i] is the cross correlation for the i-th frequency bin between channel n 1  and channel n 2 , which both are different from channel m;\n if calculated said signal power P m [i] is smaller than directional power P S m [i], postprocessing said directional power P S m [i] such that it is less than P m [i] and approaches P S m [i] as far as possible; \n calculating a band signal power P m,b , a band-wise inter-channel cross correlation c mn,b , a directional band power P S m ,b  and an ambient band power \u03c3 m,b 2 =P m,b \u2212P S m ,b , wherein b denotes a band; \n calculating a primary-to-ambient ratio PAR m [i]=P S m [i]/\u03c3 m 2 [i] for each individual channel and their sum R s [i]=\u03a3 m=1 M PAR m [i], or calculating a primary-to-ambient ratio PAR m,b =P S m ,b /\u03c3 m,b 2  for each individual band and their sum R s,b =\u03a3 m=1 M PAR m,b ; \n estimating directional and ambient signal spectra based on PAR m [i] and c mn [i], or based on PAR m,b  and c mn,b , respectively; \n scaling said estimated directional and ambient signal spectra such that an attenuation caused by said spectral estimation is reversed.

Metadata:
- Claim Count in Document: 4.0
- Percentile: 91.0
- Lexical Diversity: 2.42857
- Patent Class: 704.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['15761351', '15509596', '14400039', '15927985', '14787978']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.319164169636449
- 35 USC 102 Novelty (BERT): 0.5208951628033276
- Combined Prediction Score: 0.3393372689531369
- Mean Citation Score: 282.4110740000001
- Max Citation Score: 330.25522
- Similarity Product: 239.69072752765533

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test