PATENT CLAIM ANALYSIS

Application Number: 15974337
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2018-09
Patent Classification: ["379", "406070"]

Abstract:
The present disclosure discloses an echo cancellation method and apparatus. The method includes: obtaining a far-end signal and a near-end signal; detecting whether a speech signal exists in the near-end signal; processing the far-end signal according to a normalized least mean square adaptive filtering (NLMS) algorithm to obtain an estimated signal, and subtracting the estimated signal from the near-end signal to obtain a residual signal; after it is detected that the speech signal exists in the near-end signal, detecting whether the residual signal meets a preset output condition; and when it is detected that the residual signal does not meet the preset output condition, multiplying the residual signal by a first attenuation factor to obtain an output signal.

Claim (Index 7):
The electronic device according to  claim 6 , wherein, for detecting whether the residual signal meets a preset output condition, the processor is further configured for:\n calculating a first correlation coefficient R1 between the residual signal and the far-end signal, the first correlation coefficient R1 being used to represent a correlation between the residual signal and the far-end signal; calculating a second correlation coefficient R2 between the residual signal and the near-end signal, the second correlation coefficient R2 being used to represent a correlation between the residual signal and the near-end signal; determining whether the first correlation coefficient R1 is less than a first threshold, and whether the second correlation coefficient R2 is greater than a second threshold; determining that the residual signal meets the preset output condition when the first correlation coefficient R1 is less than the first threshold, and the second correlation coefficient R2 is greater than the second threshold; and determining that the residual signal does not meet the preset output condition when the first correlation coefficient R1 is greater than or equal to the first threshold, or the second correlation coefficient R2 is less than or equal to the second threshold.

Metadata:
- Claim Count in Document: 20.0
- Percentile: 93.0
- Lexical Diversity: 2.09677
- Patent Class: 379.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['12117943', '13222050', '13667331', '14853979', '12204608']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.5150262325197065
- 35 USC 102 Novelty (BERT): 0.5014748816183136
- Combined Prediction Score: 0.5136710974295672
- Mean Citation Score: 231.248034
- Max Citation Score: 239.55106
- Similarity Product: 160.26978957635285

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