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US6442272B1
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Voice conferencing system having local sound amplification
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US5274705A
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Nonlinear processor for an echo canceller and method
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Neural network solution for interconnection apparatus
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Adaptive filter with coefficient averaging and method
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Double talk detector for echo canceller and method
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DX circuit
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Nonblocking switching system and method
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Universal circuit module mounting structure
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Electronic transformer
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Improved electronic hybrid circuit
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Impedance canceller circuit
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Impedance generator circuit
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CA1138061A
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Electronic transformer
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US4283770A
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Signal processor for digital echo canceller
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Residual echo suppressor for echo canceller
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Current source circuits with common mode noise rejection
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US4177361A
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Signaling tone transparent echo suppressor
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