4. Telephonic communications
  5. Supervisory or control line signaling
  6. Using line or loop condition detection
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Voice activity detection system and method

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Voice activity detector for half-duplex audio communication syst

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Voice activity detector for half-duplex audio communication syst

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Voice direction recognition in a digital telephone station

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Voice messaging system caller ring bypass control

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Reexamination Certificate

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Voice operated switch

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Voice switch used in hands-free communications system

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Voice transmission systems with voice cancellation

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Voice-switched handset receive amplifier

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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