PATENT CLAIM ANALYSIS

Application Number: 15991811
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2018-09
Patent Classification: ["704", "226000"]

Abstract:
The present invention relates to a multi-band noise reduction system for digital audio signals producing a noise reduced digital audio output signal from a digital audio signal. The digital audio signal comprises a target signal and a noise signal, i.e. a noisy digital audio signal. The multi-band noise reduction system operates on a plurality of sub-band signals derived from the digital audio signal and comprises a second or adaptive signal-to-noise ratio estimator which is configured for filtering a plurality of first signal-to-noise ratio estimates of the plurality of sub-band signals with respective time-varying low-pass filters to produce respective second signal-to-noise ratio estimates of the plurality of sub-band signals. A low-pass cut-off frequency of each of the time-varying low-pass filters is adaptable in accordance with a first signal-to-noise ratio estimate determined by a first signal-to-noise ratio estimator and/or the second signal-to-noise ratio estimate of the sub-band signal.

Claim (Index 24):
A multi-band noise reduction system for noisy digital audio signals, comprising:\n an analysis filter bank configured for dividing the noisy digital audio input signal into a plurality of sub-band signals; a noise estimator configured for determining respective sub-band noise estimates of the plurality of sub-band signals; a first signal-to-noise ratio estimator configured for determining respective first signal-to-noise ratio estimates of the plurality of sub-band signals; and a second signal-to-noise ratio estimator configured for filtering the plurality of first signal-to-noise ratio estimates by respective time-varying lowpass filters to produce respective second signal-to-noise ratio estimates of the plurality of sub-band signals, wherein a lowpass cut-off frequency of each lowpass filter of the plurality of time-varying lowpass filters is adaptable in accordance with the second signal-to-noise ratio estimate of the corresponding sub-band signal by increasing the cut-off frequency of the lowpass filter for increasing values of the second signal-to-noise ratio estimate of the sub-band signal.

Metadata:
- Claim Count in Document: 56.0
- Percentile: 93.0
- Lexical Diversity: 2.45161
- Patent Class: 704.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15318046', '15608224', '11598705', '15389143', '11429308']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.3010291509245911
- 35 USC 102 Novelty (BERT): 0.5890670783700289
- Combined Prediction Score: 0.3298329436691349
- Mean Citation Score: 322.922792
- Max Citation Score: 509.98706
- Similarity Product: 451.19901826362366

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