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Buffering

Module by: Don Johnson

Summary: Definition of buffering.

Implementing the digital filter shown in the A/D block diagram with a frequency-domain implementation requires some additional signal management not required by time-domain implementations. Conceptually, a real-time, time-domain filter could accept each sample as it becomes available, calculate the difference equation, and produce the output value, all in less that the sampling interval T s T s . Frequency-domain approaches don't operate on a sample-by-sample basis; instead, they operate on sections. They filter in real time by producing N x N x outputs for the same number of inputs faster than N x T s N x T s . Because they generally take longer to produce an output section than the sampling interval duration, we must filter one section while accepting into memory the next section to be filtered. In programming, the operation of building up sections while computing on previous ones is known as buffering. Buffering can also be used in time-domain filters as well but isn't required.

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