Polyphase Interpolator - 7.2 English

This Figure shows the polyphase interpolation filter option which implements the computationally efficient 1-to- P interpolation filter.

Figure 3-27: 1-to- P Polyphase Interpolator

X-Ref Target - Figure 3-27

A set of N prototype filter coefficients is mapped to the polyphase subfilters according to Equation 3-1 , as in the decimation case.

Each new input sample engages all of the polyphase segments in parallel. For each input sample delivered to the filter, output samples, one from each segment, are delivered to the filter output port, as indicated by the commutator in This Figure .

The output sample rate is where is the sample rate of the input data stream . Observe each of the polyphase segments operating at the low input sample rate (compared to the high output sample rate ) and a total of operations performed per output point.