4. Telephonic communications
  5. Substation or terminal circuitry
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Direct coupling of telephone volume control with remote...

Telephonic communications – Substation or terminal circuitry – Noise suppression
Reexamination Certificate

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Directional microphone assembly

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

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Distributed processing of audio signals

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

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Dual-mode speaker telephone

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

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Duplex hands-free communications circuit

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

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Duplex microphone communication system

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Patent

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Duplex transducer for simultaneous voice broadcast and reception

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

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Dynamic optimization of handsfree microphone gain

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

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Dynamically adjustable digital gyrator having extendable...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate

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