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US 4,366,547 AGranted
Digital filter with scaled tap coefficients
AssigneeCodex Corporation
InventorCharles K. Miller
Life of this patent
Estimating the term…
Abstract
Modem circuitry for processing data signals, featuring a digital filter whose tap coefficients are all scaled by a common factor such that the most significant bits of the filter output are indicative of the digital data.
Claims5
Modem circuitry for processing signals representing digital data, comprising
- sampling means for providing a stream of samples of said signals,
- storage means connected to receive from said sampling means and to store a set of said samples,
- arithmetic means responsive to said storage means and connected to multiply each said sample by a tap coefficient drawn from a set of scaled tap coefficients and to add the resulting products to form a multiple-bit value, and
- comparator means responsive to said arithmetic means and connected to compare a predetermined group of the bits of said multiple-bit value with a threshold value to produce an output signal, said group being selected from a set consisting of fewer than all the bits in said multiple-bit value.
1 more element
Dependencies are inferred from the claim text.