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Figure 2: Subband stereophonic acoustic echo canceler. Four analysis filter banks decompose the far-end and near-end signals. In each sub- band, the two-channel FRLS algorithm cancels the major part of the echo. The residual echo is reduced even further by the suppressor before reconstructing the fullband echo canceled signal, e(n).

Figure 2 Subband stereophonic acoustic echo canceler. Four analysis filter banks decompose the far-end and near-end signals. In each sub- band, the two-channel FRLS algorithm cancels the major part of the echo. The residual echo is reduced even further by the suppressor before reconstructing the fullband echo canceled signal, e(n).

Related Figures (4)

Figure 1: Schematic diagram of a stereophonic echo canceler.
Figure 1: Schematic diagram of a stereophonic echo canceler.
Table 1: Calculation complexity comparison given as number of real valued mult/add per full- band sample period. Corresponding fullband im- pulse response length L = 3168, downsampling rate r = 4M, number of non-causal taps per sub- band Ch. = 5 [12].
Table 1: Calculation complexity comparison given as number of real valued mult/add per full- band sample period. Corresponding fullband im- pulse response length L = 3168, downsampling rate r = 4M, number of non-causal taps per sub- band Ch. = 5 [12].
Figure 3: Timing diagram of execution. The upper half of the figure describes DSP A, and the lower half DSP B,C,D. Solid boxes show tasks performed by the CPU and dashed boxes tasks performed by the DMAs.
Figure 3: Timing diagram of execution. The upper half of the figure describes DSP A, and the lower half DSP B,C,D. Solid boxes show tasks performed by the CPU and dashed boxes tasks performed by the DMAs.
Figure 4: (a) (left channel). Transmission room speech signal Talker position is changed at 5.1 s. (b) Mean square error performance for the two cases: unprocessed, a = 0 (dashed line), and non- linear processed speech, a = 0.5 (solid line).
Figure 4: (a) (left channel). Transmission room speech signal Talker position is changed at 5.1 s. (b) Mean square error performance for the two cases: unprocessed, a = 0 (dashed line), and non- linear processed speech, a = 0.5 (solid line).
Related topics:
EngineeringSignal ProcessingAudio Signal ProcessingSpeech ProcessingReal Time SystemsLanguage Culture and CommunicationAdaptive FiltersAdaptive AlgorithmPsychology and Cognitive SciencesReal time implementation
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