Echo eliminating method, device and system
A technology of echo cancellation and input signal, which is applied in the electronic field and can solve problems such as large signal transmission delay
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Embodiment 1
[0054] An embodiment of the present invention provides an echo cancellation system, which is used to solve the technical problem of long signal transmission delay time existing in the existing echo cancellation method. refer to figure 1 , the system at least includes a near-end filter bank, a near-end buffer pool, a far-end filter bank, a far-end buffer pool, an adaptive filter bank, and a controller; the controller and the near-end filter bank, The near-end buffer pool, the far-end filter bank, the remote buffer pool, and the adaptive filter bank are respectively connected.
[0055] Wherein, the near-end buffer pool is used to buffer the original near-end input signal collected at the microphone; the far-end buffer pool is used to buffer the original far-end input signal at the speaker; the near-end filter bank is used to obtain the original The near-end inputs the signal and processes it to generate M near-terminal band signals d i (n), and sent to the adaptive filter bank...
Embodiment 2
[0082] Embodiment 2 of the present invention provides an echo cancellation method, which is applied to the adaptive filter bank in Embodiment 1 above. Refer to Figure 4 , the method includes:
[0083] Step 101: Obtain a near-end input signal D(n) and a far-end input signal X(n); wherein, the near-end input signal D(n) includes M near-terminal band signals d i (n), the remote input signal X(n) includes M remote sub-band signals x i (n), n is the sampling moment, i is the sequence number of the subband, i=0,1,...,M-1;
[0084] Step 102: According to the remote input signal x corresponding to each subband i (n) The near-end input signal d corresponding to each sub-band i (n) Perform filtering processing to generate the residual signal e corresponding to each sub-band i (n);
[0085] Step 103: The residual signal e corresponding to all subbands i (n) performing synthesis processing to generate a synthesized residual signal ec(n);
[0086] Step 104: Perform frequency-time c...
Embodiment 3
[0103]Embodiment 3 of the present invention provides an echo canceling device, which is used to implement the echo canceling method described in Embodiment 2 above. Refer to Figure 5 , the device includes:
[0104] An acquisition unit 201, configured to acquire a near-end input signal D(n) and a far-end input signal X(n); wherein, the near-end input signal D(n) includes M near-terminal band signals d i (n), the remote input signal X(n) includes M remote sub-band signals x i (n), n is the sampling moment, i is the sequence number of the subband, i=0,1,...,M-1;
[0105] The processing unit 202 is configured to, according to the remote input signal x corresponding to each subband i (n) The near-end input signal d corresponding to each sub-band i (n) Perform filtering processing to generate the residual signal e corresponding to each sub-band i (n);
[0106] Combining unit 203, configured to combine residual signals e corresponding to all subbands i (n) performing synthesis...
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