PATENT CLAIM ANALYSIS

Application Number: 15905319
Application Type: Utility
Filing Date: 2018-02
Publication Date: 2018-06
Patent Classification: ["381", "055000"]

Abstract:
This application relates to methods and apparatus for loudspeaker protection. A loudspeaker protection system ( 100 ) receives a digital audio signal comprising a plurality of samples at an input node (IN). A delay block ( 15 ) delays the digital audio signal and a gain block ( 14 ) applies a controlled gain to the delayed digital audio signal. An excursion predictor ( 12 ) is configured to receive a version of the audio signal from the signal path upstream of the delay block and determine a predicted excursion for a loudspeaker based on the audio signal. A gain controller ( 23 ) controls a gain setting (g) of the gain block in response to the predicted excursion and a first loudspeaker impulse response model and a predetermined excursion limit. The gain controller ( 23 ) is configured to determine at least one gain setting {g a  g i } to be applied to a set of samples {V a  . . . V i } of the audio signal delayed by the delay block where the set of samples of the audio signal corresponds to a time-span which is less than an impulse response settling time of the loudspeaker.

Claim (Index 20):
A loudspeaker excursion limiter comprising:\n an input for receiving digital input signal comprising a stream of samples; an output for outputting an audio signal for a loudspeaker; a signal path from said input to said output comprising a delay block and a gain block, wherein the gain block is downstream of the delay block and applies a gain controlled by a gain calculation block; and an excursion predictor block configured to estimate loudspeaker excursion based on the digital input signal and a first loudspeaker model; wherein: said gain calculation block determines a first set of gains to be applied to a first sequential set of delayed samples and a second set of gains to be applied to a second sequential set of delayed samples, all based on the respective currently estimated loudspeaker excursion, a predefined excursion limit and a loudspeaker impulse response model; the second set of samples partly overlaps with the first set of samples; the gain controller is configured to use, for any sample in both the first and second sets, the lowest respective gain of the first and second sets of gains that correspond to that sample; and the time-span of said sequential set of delayed samples is less than a loudspeaker impulse response settling time.

Metadata:
- Claim Count in Document: 47.0
- Percentile: 88.0
- Lexical Diversity: 2.47674
- Patent Class: 381.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15186992', '15547836', '15547850', '13360427', '13206379']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7187254146130492
- 35 USC 102 Novelty (BERT): 0.5970465928083891
- Combined Prediction Score: 0.7065575324325831
- Mean Citation Score: 307.582856
- Max Citation Score: 507.70108
- Similarity Product: 484.6318297071791

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