PATENT CLAIM ANALYSIS

Application Number: 15761448
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2019-02
Patent Classification: ["381", "066000"]

Abstract:
An audio signal processing apparatus comprises a receiver ( 403 ) receiving an audio signal sampled at a first sampling frequency, the audio signal having a maximum frequency below half the first sampling frequency by a first frequency margin. A tilter bank ( 405 ) generates subband signals for the digital audio signal using overlapping sub-filters. A first frequency shifter ( 407 ) applies a frequency shift to at least one subband of the set of subbands and a decimator ( 409 ) decimates the subband signals by a N decimation factor resulting in a decimated sampling frequency being at least twice a bandwidth of each of the overlapping sub-filters. The frequency shift for a subband is arranged to shift the subband to a frequency interval being a multiple of a frequency interval from zero to half the decimated sample frequency. The subband may be individually processed and the processed subbands may subsequently be combined to generate a full band output signal.

Claim (Index 13):
An audio signal processing apparatus comprising:\n a receiver for receiving a set of decimated subband signals at a decimated sample rate representing an audio signal at a first sampling frequency and having a maximum frequency not exceeding a threshold frequency being lower than half the first sampling frequency by a first frequency margin, the decimated subband signals being frequency shifted to a frequency interval being a multiple of a frequency interval from zero to half the decimated sample frequency and subsequently decimated by a decimation factor; and a synthesizer for synthesizing an audio output signal at the first sampling frequency from the set of decimated subband signals; the synthesizer comprising:\n an upsampler for upsampling the decimated subband signals to the first sampling frequency to generate upsampled subband signals; \n a second frequency shifter for applying a reverse frequency shift to the upsampled subband signals, the reverse frequency shift for a first decimated subband signal resulting in the first decimated subband signal being shifted to a frequency range corresponding to the frequency range of the decimated subband signal in the audio signal prior to frequency shifting and decimation; \n a subband merger for merging, following the application of the reverse frequency shift, the upsampled subband signals to generate a merged audio signal; \n a set of subband filters for filtering the upsampled processed subband signals to attenuate upsample alias spectra for each subband, each filter of the set of filters having a bandwidth not exceeding half the first sampling frequency.

Metadata:
- Claim Count in Document: 2.0
- Percentile: 90.0
- Lexical Diversity: 2.07407
- Patent Class: 381.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['14824998', '15214694', '15470786', '14807554', '11834608']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7043554062155399
- 35 USC 102 Novelty (BERT): 0.5336159901289259
- Combined Prediction Score: 0.6872814646068786
- Mean Citation Score: 339.96639399999987
- Max Citation Score: 356.3304
- Similarity Product: 281.4806342569828

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

Dataset: test