Patent ID: 8571204

Claim:
An apparatus for echo control in a parameter domain, comprising: an echo detection module configured to extract parameter domain characteristic parameters of a far-end output signal and a near-end input signal, respectively, through a parameter domain decoding, and detect whether a near-end input signal frame is an echo frame according to the parameter domain characteristic parameters, wherein the parameter domain characteristic parameters comprise a Line Spectrum Frequency (LSF), a fixed codebook gain and an adaptive codebook gain; and a transition module configured to, when the echo detection module detects the near-end input signal frame as a non-echo frame during a handover from echo to non-echo, re-quantize the fixed codebook gain, the adaptive codebook gain and an LSF prediction error in the near-end input signal frame, and replace the original fixed codebook gain, the original adaptive codebook gain and the original LSF in the near-end input signal frame with the re-quantized fixed codebook gain, the re-quantized adaptive codebook gain and the re-quantized LSF prediction error in the near-end input signal frame.