发明授权
- 专利标题: System and method for comfort noise generation
- 专利标题(中): 用于舒适噪声产生的系统和方法
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申请号: US09792826申请日: 2001-02-23
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公开(公告)号: US06766020B1公开(公告)日: 2004-07-20
- 发明人: Wenshun Tian , Youhong Lu
- 申请人: Wenshun Tian , Youhong Lu
- 主分类号: H04M100
- IPC分类号: H04M100
摘要:
A system for creating a comfort noise signal, said system includes a clipping circuit, a comfort noise generator, and a switch. The clipping circuit receives a near-end signal, a far-end signal and a residual signal. The clipping circuit determines the power of the far-end signal, the power of the near-end signal and the power of the residual signal. The clipping circuit determines the ratio of the power of the near-end signal to the residual signal and whether the ratio is less than a predetermined threshold. A comfort noise determination block is coupled to the residual signal and selectively forms a comfort noise signal. A switch is coupled to the comfort noise determination block and the clipping circuit. The switch is activated to transmit the comfort noise signal whenever the ratio of the power of the near-end signal to the residual signal is less than a predetermined threshold.
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