Multiplex communications – Pathfinding or routing – Through a circuit switch
Reexamination Certificate
2001-07-31
2008-03-18
Pham, Chi (Department: 2616)
Multiplex communications
Pathfinding or routing
Through a circuit switch
C370S523000
Reexamination Certificate
active
07346048
ABSTRACT:
A circuit and method are presented for signal processing and routing of digital voice telephony signals, using a specialized high-density integrated circuit voice processor. The voice processor performs several essential functions required for telephony processing, including echo cancellation, protocol conversion, and dynamic range compression/expansion. These functions are traditionally performed by multiple circuits or modules. By combining these capabilities in a single device, power and circuit board area requirements are reduced. The embodiment of the circuit and method disclosed herein include novel implementations of a time-slot interchange circuit and a telephony signaling circuit. Both of these circuits are designed to minimize demands on the signal processing engines incorporated within the voice processor, and account for very little of the on-chip circuitry.
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Daffer McDaniel LLP
LSI Logic Corporation
Pham Chi
Phan Tri H.
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