4. Telephonic communications
  5. Substation or terminal circuitry
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Histogram-based processing of audio signals

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

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Hold circuits for telephone systems

Telephonic communications – Substation or terminal circuitry – Hold circuit
Patent

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Hook-flash simulation in parallel with off-hook devices

Telephonic communications – Substation or terminal circuitry – Hold circuit
Reexamination Certificate

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Howling canceller

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

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