A Framework for Applying Same Filter to Different Signal Processing System



Over the years, many techniques that exploit the filters’ structure and properties to achieve fault tolerance have been proposed. The TMR, which triplicates the design and adds voting logic to correct errors, is commonly used. However, it more than triples the area and power of the circuit, something that may not be acceptable in some applications.  Digital filters are widely used in signal processing and communication systems. In some cases, the reliability of those systems is critical, and fault tolerant filter implementations are needed. As technology scales, it enables more complex systems that incorporate many filters. In those complex systems, it is common that some of the filters operate in parallel, for example, by applying the same filter to different input signals. Recently, a simple technique that exploits the presence of parallel filters to achieve fault tolerance has been presented. In this brief, that idea is generalized to show that parallel filters can be protected using error correction codes (ECCs) in which each filter is the equivalent of a bit in a traditional ECC. The technique is evaluated using a case study of parallel finite impulse response filters showing the effectiveness in terms of protection and implementation cost. This new scheme allows more efficient protection when the number of parallel filters is large.

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