4. Television
  5. Two-way video and voice communication
  6. Conferencing

VTEL Corporation

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Acoustic source location using a microphone array

Television – Two-way video and voice communication – Conferencing
Reexamination Certificate

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Apparatus and method for avoiding invalid camera positioning...

Television – Two-way video and voice communication – Conferencing
Reexamination Certificate

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Apparatus and method for controlling an acoustic echo canceler

Pulse or digital communications – Equalizers – Automatic
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