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A custom VLSI architecture for the CCITT wideband coding standard

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2 Author(s)
P. T. Whitcomb ; Codex Corp., Mansfield, MA, USA ; H. M. Ahmed

A custom VLSI architecture for implementing the CCITT G.722 64-kb/s (7-kHz) wideband audio coding standard is presented. By tailoring the architecture to the algorithm, an architecture was designed that is capable of processing a full duplex channel in less than 625 cycles. That is 71-73% less cycles than are required by the reported general-purpose DSP implementations. In a 1.5-μ technology with a 100-ns cycle time, it is estimated that the architecture would consume 95000 mL2 of silicon and support two full duplex channels on a single chip. The authors wrote a behavioral simulation of the architecture and its implicit microcode. This simulates the architecture's behavior at the bit level. The simulation passes the CCITT G.722 test vectors, demonstrating that the implementation conforms to the standard

Published in:

IEEE Journal on Selected Areas in Communications  (Volume:8 ,  Issue: 8 )