Apparatus and method for generating filtered multilevel data fro

Details Apparatus and method for generating filtered multilevel data fro Apparatus and method for generating filtered multilevel data fro

1983-09-19

1986-10-21

Thomas, James D.

Boots, shoes, and leggings

364825, 375 17, 360 41, G06F 738, G06G 702, H04L 2534, H04L 2549

Patent

active

046189416

ABSTRACT:
An embodiment of the invention includes a binary linear phase response filter having a plurality of weighted outputs and a summing circuit which sums groups of the weighted outputs. A polarity inverting mechanism is provided for selectively changing the polarity of the summed outputs from the summing circuit means. An encoding circuit controls the polarity selection in accordance with the logic rule for converting non-return to zero (NRZ) data into return to zero data. Another summing circuit sums the outputs of the polarity inverting mechanism and provides a filtered multilevel data output.

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Generation of Digital Signalling Waveforms, by Herbert B. Voelcker, 2/68, pp. 81-93, text on p. 91 under Multi-Level Signalling.
A Digital Mobile Radio for 5-6 Kilohertz Channels, by Scott Carney, Donald Linder, dated Jun. 1982, pp. 1-8, & Subtitle "Base-Band Premodulation Filter".

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