PATENT CLAIM ANALYSIS

Application Number: 15920086
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2018-10
Patent Classification: ["381", "071400"]

Abstract:
An error path characteristic model correction control unit determines the deviation of the phase of an actual transfer function from the phase of an error path characteristic model, from a cross correlation between an error signal output from a microphone and a signal in which the error path characteristic model is applied to a noise cancellation sound to be output and a cross correlation between the error signal and a signal in which a transfer function having a phase characteristic deviating by +90 degrees from the phase characteristic of the error path characteristic model is applied to the noise cancellation sound. The error path characteristic model correction control unit then corrects the error path characteristic model so that the determined deviation is reduced to ±90 degrees.

Claim (Index 1):
An active noise control device that reduces noise, the device comprising:\n a speaker that outputs a noise cancellation sound that cancels noise at a predetermined noise cancellation position; a reference signal generating means for generating a reference signal; a noise cancellation sound generating means having an adaptive filter that adjusts a phase and amplitude of the noise cancellation sound, the noise cancellation sound generating means being configured to generate the noise cancellation sound from the reference signal by using the adaptive filter; a microphone that picks up a combined sound generated by combining noise at the noise cancellation position and the noise cancellation sound and outputs the combined sound as an error signal; an error path characteristic model formed by numerically modeling a transfer function for an error path; a filtered reference signal generating means for generating a filtered reference signal from the reference signal through the error path characteristic model; an adaptive filter coefficient adjusting means for adjusting an adaptive filter coefficient of the adaptive filter so as to reduce the error signal by using the filtered reference signal and the error signal; a phase characteristic difference determining means for determining a difference in phase characteristic between the error path characteristic model and an actual error path between the speaker and the microphone; and an error path characteristic model correcting means for correcting the error path characteristic model according to the difference in phase characteristic, the difference being determined by the phase characteristic difference determining means, so that the difference in phase characteristic between the error path characteristic model and the actual error path is reduced.

Metadata:
- Claim Count in Document: 1.0
- Percentile: 90.0
- Lexical Diversity: 2.58
- Patent Class: 381.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['16075154', '12015219', '12649770', '12696862', '14856062']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7003579967441822
- 35 USC 102 Novelty (BERT): 0.4683826165187341
- Combined Prediction Score: 0.6771604587216374
- Mean Citation Score: 212.788574
- Max Citation Score: 218.82655
- Similarity Product: 197.12944062149523

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 0
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test