Patent ID: 9443534
Filing Date: 2016-09-13
CPC Classification: G10L

Claim Text:
1. A method of extending a bandwidth of an audio signal with a time domain approach, the method comprising: receiving a baseband audio signal having a first frequency content within a first frequency band that extends from zero frequency to a first positive frequency; up-sampling the baseband audio signal to produce a baseband up-sampled signal; mirroring the baseband audio signal to produce a baseband mirrored signal, wherein the baseband mirrored signal comprises second frequency content within the first frequency band that is mirrored over frequency with respect to the first frequency content; up-sampling and low-pass filtering the baseband mirrored signal using non-symmetric low-pass-filtering to produce a high band mirrored signal; and mirroring the high band mirrored signal to produce an extra high band signal; and generating a bandwidth-extended audio signal by summing the extra high band signal and the baseband up-sampled signal, wherein the steps of up-sampling the baseband audio signal, mirroring the baseband audio signal, up-sampling and low-pass filtering the baseband mirrored signal, mirroring the high band mirrored signal, and generating the bandwidth-extended audio signal are performed in a time domain using a hardware-based decoder.