Patent Document ID: 10008218
Application ID: 15667359
Patent Flag: 1

Claim One:
1. A method of performing blind bandwidth extension of a musical audio signal, the method comprising: storing, by a memory, a plurality of prediction models, wherein the plurality of prediction models were generated using an unsupervised clustering method and a supervised regression process; receiving, by a processor, an input audio signal, wherein the input audio signal has a frequency range between zero and a first frequency; processing, by the processor, the input audio signal using a time-frequency transformer to generate a plurality of subbands; extracting, by the processor, a subset of subbands from the plurality of subbands, wherein a maximum frequency of the subset is less than a cutoff frequency; extracting, by the processor, a plurality of features from the subset of subbands; selecting, by the processor, a selected prediction model from the plurality of prediction models using the plurality of features; generating, by the processor, a second set of subbands by applying the selected prediction model to the subset of subbands, wherein a maximum frequency of the second set of subbands is greater than the cutoff frequency; processing, by the processor, the subset of subbands and the second set of subbands using an inverse time-frequency transformer to generate an output audio signal, wherein the output audio signal has a maximum frequency greater than the first frequency; and outputting, by a speaker, the output audio signal.