PATENT CLAIM ANALYSIS

Application Number: 16174056
Application Type: Utility
Filing Date: 2018-10
Publication Date: 2019-02
Patent Classification: ["704", "500000"]

Abstract:
The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.

Claim (Index 2):
A method performed in an audio decoder for producing a full bandwidth audio signal having a lowband portion and a highband portion, the apparatus comprising:\n filtering a time domain decoded audio signal with a real-valued, cosine modulated analysis filterbank to produce a plurality of real-valued subband signals; regenerating at least some of the highband portion by copying one or more of the plurality of real-valued subband signals up to the highband portion;\n identifying subband signals where aliasing created by spectral envelope adjustment of an audio signal may occur based at least in part on a linear predictor applied to at least some of the plurality of real-valued subband signals; \n estimating an energy of at least some of the plurality of copied real-valued subband signals; \n modifying a gain to be applied to at least some of the identified subbands signals based at least in part on the estimated energy;\n filtering the plurality of real-valued subband signals and the highband portion with a real-valued synthesis filterbank to produce the full bandwidth audio signal, the full bandwidth audio including real-valued time domain samples; and \n outputting the full bandwidth audio signal, wherein the method is implemented at least in part with one of more hardware elements, and wherein the linear predictor is a second order linear predictor.

Metadata:
- Claim Count in Document: 3.0
- Percentile: 97.0
- Lexical Diversity: 1.43137
- Patent Class: 704.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15799853', '15799777', '15799641', '15587667', '15828829']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.3776825997016955
- 35 USC 102 Novelty (BERT): 0.6099843716862814
- Combined Prediction Score: 0.4009127769001541
- Mean Citation Score: 397.934778
- Max Citation Score: 414.0867
- Similarity Product: 410.4812772074103

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