Browse Prior Art Database

Programmable Transversal Filter

IP.com Disclosure Number: IPCOM000073770D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Jones, GD: AUTHOR

Abstract

This is a data transmission system wherein only fluctuations of signal amplitude 1 from sampling instant to sampling instant are encoded in binary and further wherein each binary signal represents the fact that the corresponding signal magnitude exceeds the sum of the prior differences between the instant magnitude and a reference. The system comprises an N-stage shift register 5; means 1, 3, 7 for applying = successive binary signals to the shift register, a summing circuit 9, E4 having M input ports M1, M2, M3 and a logic arrangement C1, C2, C3 responsive to separately coded indicia, such as timing or address signals (timing generator 11), for distributing the binary signals present at a preselected M of the N-shift register stages to preselected and corresponding ones of the M input ports.

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Programmable Transversal Filter

This is a data transmission system wherein only fluctuations of signal amplitude 1 from sampling instant to sampling instant are encoded in binary and further wherein each binary signal represents the fact that the corresponding signal magnitude exceeds the sum of the prior differences between the instant magnitude and a reference. The system comprises an N-stage shift register 5; means 1, 3, 7 for applying = successive binary signals to the shift register, a summing circuit 9, E4 having M input ports M1, M2, M3 and a logic arrangement C1, C2, C3 responsive to separately coded indicia, such as timing or address signals (timing generator 11), for distributing the binary signals present at a preselected M of the N-shift register stages to preselected and corresponding ones of the M input ports.

In this transversal filter, an analog signal applied to input terminal 1 and a series of clock pulses applied at terminal 7 result in a series of delta-modulated pulses from delta modulator 3. The pulses represent the incremental change in analog values from sample to sample. The output from delta-signal modulator 3 drives shift register 5. The shift register is likewise regulated by timing generator
11. In this embodiment, all of the coefficient weighting is done digitally and no analog summing occurs. The weighting or coefficient of a particular tap of shift register 5 is determined by digital pulse-width multiplication. The timing waveforms...