PATENT CLAIM ANALYSIS

Application Number: 15761694
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2018-12
Patent Classification: ["455", "570000"]

Abstract:
An echo time delay detection method, an echo elimination device, and terminal equipment are provided. The echo time delay detection method includes: obtaining an audio signal transmitted through air and acquired by an audio input device of terminal equipment when detecting a call access request, the audio signal corresponding to an audio output by an audio output device of the terminal equipment; converting the audio signal to obtain a signal to be processed; determining a reference signal corresponding to the audio signal; and determining an echo time delay value according to the reference signal and the signal to be processed.

Claim (Index 10):
The echo time delay detection method according to  claim 5 , wherein the determining the binary array of each frame of the reference signal comprises:\n respectively performing fast fourier transform (fft) of 2M frequency bins on each frame of the reference signal, to obtain a fft processing result of all the frequency bins of each frame of the reference signal, wherein M is a set value; making j a frequency bin number, respectively calculating a power spectrum of a j th  frequency bin of each frame of the reference signal according to the fft processing result of all the frequency bins of each frame of the reference signal, wherein j is an integer in a range of m1 to m2, m1 is obtained by rounding down a calculation result of (M*a)/(fs*c), m2 is obtained by rounding down a calculation result of (M*b)/(fs*c), a is a first set value, b is a second set value, c is a third set value, and fs is an acquisition frequency of the audio signal; respectively calculating a smooth value of the power spectrum of the j th  frequency bin of each frame of the reference signal; and for each frame of the reference signal, setting a first value for the j th  frequency bin in response to the power spectrum of the j th  frequency bin being greater than the smooth value of the power spectrum of the j th  frequency bin, or setting a second value for the j th  frequency bin in response to the power spectrum of the j th  frequency bin being less than or equal to the smooth value of the power spectrum of the j th  frequency bin, to obtain binary values corresponding to all the frequency bins, to construct a binary array corresponding to each frame of the reference signal.

Metadata:
- Claim Count in Document: 19.0
- Percentile: 90.0
- Lexical Diversity: 2.27083
- Patent Class: 455.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['14060141', '14400289', '15651757', '13933005', '15341520']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6990410050474802
- 35 USC 102 Novelty (BERT): 0.495838206816031
- Combined Prediction Score: 0.6787207252243352
- Mean Citation Score: 165.783996
- Max Citation Score: 169.41493
- Similarity Product: 102.61927085701228

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