| 摘要 |
The invention provides a particular construction for digital filters in which, instead of multiplying various ones of the digital samples by weights and adding the results together, one or more of the digital samples is inspected by a ranging unit, which then instructs an incrementing unit to increment, decrement or leave alone one of the samples to provide the result. In order to achieve very high data rates, the incremented and decremented values can be pre-prepared whilst the ranging unit makes its decision, and then a multiplexer responsive to the output of the ranging unit is used to select the appropriate one of the pre-prepared values.
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