Hierarchical adjustment method for echo nonlinear processing, terminal and storage medium

Abstract

The invention discloses a grading adjustment method for echo nonlinear processing, a terminal and a storage medium. The method comprises the following steps: receiving input of near-end voice and far-end echo; removing a linear portion of the echo within the echo tail length by a linear echo canceller; when the near-end voice does not exist, removing the residual value of the echo after linear processing through a non-linear echo canceller. According to the invention, the working mode of the bidirectional detector is adjusted in a graded manner, so that the echo nonlinear eliminator can work correctly in various occasions with known network ERL, the digital signal processor can also work normally in some extreme network environments, and the voice quality of a call is improved.

Description

technical field [0001] The present invention relates to the technical field of echo cancellation, in particular to a hierarchical adjustment method for nonlinear echo processing, a terminal and a storage medium. Background technique [0002] In the telecommunication system, the electrical echo is generated when the balanced impedance and the external line impedance are not completely matched in the two-to-four-wire conversion. If there is no echo cancellation processing, the remote user will hear the echo of his own speech due to network delay. [0003] Existing echo nonlinear cancellers only support enable and disable switches (enable / disable), and do not support graded adjustment of return loss (ERL, Echo return loss, return loss) for echo nonlinear processing. The current implementation can only meet the requirements of the G.168 protocol. The worst case is that the minimum ERL is 6dB. In the worst case, the nonlinear processing will be unstable, resulting in the near-en...

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Problems solved by technology

The current implementation can only meet the requirements of the G.168 protocol. The worst case is that the minimum ERL is 6dB. In the worst case, the nonlinear processing will be unstable, resulting in the near-end voice (for example, in the system from TDM- >Voice in the IP direction, the voice of the telephone enters the system from TDM, the voice entering the system from its own side is the near-end voice, and the voice coming from the opposite end is the far-end voice) part is erased, making the voice discontinuous ( The continuous speech is cut off by the nonlinear processor, resulting in discontinuity

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