Full duplex speakerphone system

Details Full duplex speakerphone system Full duplex speakerphone system

1997-08-22

1999-12-28

Isen, Forester W.

Telephonic communications

Terminal

Having loudspeaking conversation capability

379388, 379390, 341110, H04M 900

Patent

active

060091657

ABSTRACT:
The improved full duplex speakerphone system replaces two A/D converters normally required in conventional speakerphone systems with a single A/D converter. This single A/D converter is a higher speed A/D converter which is multiplexed at its input. By alternately connecting the A/D converter between a microphone input circuit and a telephone line input circuit, the single higher speed A/D converter can be used to digitize both input signals. Because the A/D converter samples the data at a much higher rate and uses a digital filter to greatly reduce the impact of aliasing, very simple, low cost external filters may be used.

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patent: 5796818 (1998-08-01), McClennon et al.
patent: 5838787 (1998-11-01), Ding et al.

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