PATENT CLAIM ANALYSIS

Application Number: 16094893
Application Type: Utility
Filing Date: 2018-10
Publication Date: 2019-03
Patent Classification: ["381", "098000"]

Abstract:
According to an example aspect of the present invention, there is provided a Method for regularizing the inversion of a stereo headphone transfer function for headphone equalization, characterized by using the equation for the equalization: H S   1 - 1  ( ω ) = H *  ( ω )  H  ( ω )  2 + β ^  ( ω )  D  ( ω ) = H *  ( ω )  H  ( ω )  2 + [ α  ( ω ) + σ 2  ( ω ) ]  D  ( ω ) . in which equation H SI −1 (ω) is sigma inversion H*(ω) is complex conjugate of a response D(ω) is a delay filter introduced to produce a causal inverse H RI −1 (ω) H*(ω) a response α(ω) is headphone reproduction bandwidth, σ(ω) an estimation of the regularization needed inside that bandwidth.

Claim (Index 2):
The method in accordance with  claim 1 , wherein the term \u03b2|B(\u03c9)| 2  is a frequency-dependent parameter, {circumflex over (\u03b2)}(\u03c9), such that the response is inverted accurately, but no inversion effort is desired for narrow notches and at frequencies outside the headphone bandwidth of reproduction, the parameter {circumflex over (\u03b2)}(\u03c9) is determined combining an estimation of the headphone reproduction bandwidth, \u03b1(\u03c9), and an estimation of the regularization needed inside that bandwidth, \u03c3(\u03c9). defining the parameter {circumflex over (\u03b2)}(\u03c9) then defined as {circumflex over (\u03b2)}(\u03c9)=\u03b1(\u03c9)+\u03c3 2 (\u03c9), where the parameter \u03b1(\u03c9) determines the bandwidth of inversion, which is defined as the frequency range where \u03b1(\u03c9) is close or equal to zero, the new regularization factor, \u03c3(\u03c9) controls the inversion effort within the bandwidth defined by \u03b1(\u03c9), if the headphone bandwidth is known, \u03b1(\u03c9) is defined using an unity gain filter, W(\u03c9), as \u03b1 \ue8a0 ( \u03c9 ) = ( 1 \uf603 W \ue8a0 ( \u03c9 ) \uf604 2 - 1 ) , ( 6 ) whereby he flat passband of W(\u03c9) corresponds to the headphone bandwidth of reproduction, typically 20 Hz to 20 kHz for high quality headphones, and in a similar manner, if the noise power spectrum estimate is available, \u03b1(\u03c9) is defined as \u03b1 \ue8a0 ( \u03c9 ) = 1 SNR \ue8a0 ( \u03c9 ) = \uf603 N \ue8a0 ( \u03c9 ) \uf604 2 \uf603 H \ue8a0 ( \u03c9 ) \uf604 2 . ( 7 ) and in order to avoid strong variation between adjacent frequency bins in the response, estimate of the noise envelope N(\u03c9), e.g. a smoothed spectrum, should be used, the new regularization factor, \u03c3(\u03c9), is defined as the negative deviation of the measured response, H(\u03c9), from the response that reduces the magnitude of the notches, \u0124(\u03c9), for instance, \u0124(\u03c9) can be defined using a smoothed version of the headphone response, and based on this, \u03c3(\u03c9) is determined as \u03c3 \ue8a0 ( \u03c9 ) = { \uf603 H \ue8a0 ( \u03c9 ) \uf604 - \uf603 H ^ \ue8a0 ( \u03c9 ) \uf604 , if \ue89e \ue89e \uf603 H ^ \ue8a0 ( \u03c9 ) \uf604 \u2265 \uf603 H \ue8a0 ( \u03c9 ) \uf604 0 , if \ue89e \ue89e \uf603 H ^ \ue8a0 ( \u03c9 ) \uf604 < \uf603 H \ue8a0 ( \u03c9 ) \uf604 . ( 8 ) and hence \u03c3 2 (\u03c9)>0 for |\u0124(\u03c9)|>|H(\u03c9)|, the parameter {circumflex over (\u03b2)}(\u03c9) contains large regularization values at notch frequencies that are narrower than the smoothing window.

Metadata:
- Claim Count in Document: 50.0
- Percentile: 97.0
- Lexical Diversity: 2.56164
- Patent Class: 381.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['15522699', '11217637', '15860489', '14553605', '13885392']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6877280173212867
- 35 USC 102 Novelty (BERT): 0.5259217711665339
- Combined Prediction Score: 0.6715473927058115
- Mean Citation Score: 241.888446
- Max Citation Score: 302.8016
- Similarity Product: 201.6966406899452

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

Dataset: test