Patent ID: 9609451
Date: 2017-03-28
CPC Classifications: G10L,H03G,H03H,H04R,H04S

Claim:
1. A method of audio reproduction, comprising: splitting a first digital audio signal into at least a first and a second frequency subbands to generate at least a first and a second subband signal, said first and second frequency subbands separated by a transition frequency band; generating a first downsampled subband signal by downsampling or decimating the first subband signal; injecting at least one tone signal that lies within the transition frequency band into the first downsampled subband signal; generating a first processed subband signal by performing an audio processing on the first downsampled subband signal; measuring in real-time amplitude and phase in the transition frequency band of the first downsampled subband signal and the first processed subband signal; processing in real-time the measurements to calculate a change in amplitude and phase in the transition frequency band; calculating in real-time both an amplitude compensation and a phase compensation for the second frequency subband to approximately match the measured change in amplitude and phase in the first frequency subband; generating in real-time a second processed subband signal by applying said amplitude and phase compensation to the transition band of the second subband signal; removing said at least one tone signal from the first processed subband signal; and combining the first and second processed subband signals to reconstruct an output audio signal.