| 摘要 |
The invention relates to a method and an apparatus for processing an audio signal, wherein the method comprises the steps of: filtering an audio signal into at least two frequency band signals, generating for each frequency band signal a plurality of sub-band signals, wherein for at least one frequency band signal the plurality of sub-band signals are generated using a time to frequency domain transform and for the at least one other frequency band the plurality of sub-band signals for the other frequency band are generated using a sub-band filterbank, and the apparatus comprises at least one processor and at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processor, cause the apparatus to perform the method. |
| 主权项 |
1. A method comprising:
filtering an audio signal into at least a first frequency band signal and a second frequency band signal, wherein frequencies of the first frequency band signal are lower than frequencies of the second frequency band signal; decimating the first, lower frequency band signal to produce a down-sampled first, lower frequency band signal; generating for the down-sampled first, lower frequency band signal, a plurality of sub-band signals using a time to frequency domain transform; generating for the second, higher frequency band signal, a plurality of non-decimated sub-band signals using a non-decimating sub-band filterbank; applying in the frequency domain noise suppression or echo suppression to at least one sub-band signal generated for the down-sampled first, lower frequency band signal using the time to frequency domain transform; applying in the time domain noise suppression or echo suppression to at least one non-decimated sub-band signal generated for the second, higher frequency band signal using the non-decimating sub-band filterbank; combining the sub-band signals generated using the time to frequency domain transform, including the at least one noise or echo suppressed sub-band signal, to form a processed lower frequency band audio signal; combining the non-decimated sub-band signals generated using the non-decimating sub-band filterbank, including the at least one noise or echo suppressed sub-band signal, to form a processed higher frequency band audio signal; and combining the processed lower frequency band audio signal and the processed higher frequency band signal to generate a processed audio signal. |
