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AU8301898A
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Spectral noise compensation for telecommunication signal processing
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US5857167A
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Combined speech coder and echo canceler
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Bi-directional asynchronous telecommunication audio signal processing
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Telecommunications network management observation and response system
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US5884255A
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Speech detection system employing multiple determinants
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US5561668A
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Echo canceler with subband attenuation and noise injection control
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US5896461A
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Compact speakerphone apparatus
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US5631958A
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Automatic echo cancellation for an integrated services digital network interface
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US5550901A
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Full-duplex adapter for PBX telephone system
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US5249225A
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Self-balancing hybrid using digitally programmable attenuator for variable impedance elements
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US5216704A
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Method for remote power fail detection and maintaining continuous operation for data and voice devices operating over local loops
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US5157653A
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Residual echo elimination with proportionate noise injection
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US4929849A
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Noise suppression in recovery of clock from NRZ data
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US3932704A
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Coherent digital frequency shift keying system
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