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Adjustable Digital Matched Filter

IP.com Disclosure Number: IPCOM000095833D
Original Publication Date: 1964-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Blasbalg, HL: AUTHOR [+2]

Abstract

The adjustable digital matched filter permits either automatic or manual change of the filter characteristic. The adjustment is obtained by a provision to select the direct output or the complement output from each stage of the filter. In this way, there are two possible outputs for each stage of the filter and, therefore, there are 2n possible filters where n is the number of stages in the matched filter.

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Adjustable Digital Matched Filter

The adjustable digital matched filter permits either automatic or manual change of the filter characteristic. The adjustment is obtained by a provision to select the direct output or the complement output from each stage of the filter. In this way, there are two possible outputs for each stage of the filter and, therefore, there are 2n possible filters where n is the number of stages in the matched filter.

In operation, data is received by shift register 10 and moved down the length of the filter by shift pulses. Each stage of register 10 has a direct output and a complement output. One of the outputs in each stage is passed by switch 12 to summing network 14. Whether a positive or negative switch 12 is gated to pass the direct or complement output depends on Beta register 11. The stages of register 10 and register 11 are paired up. Each stage of register 1 1 operates a pair of switches 12 and thus controls whether the direct or complement output is passed from the corresponding stage of register 10 to network 14.

For example, if register 11 contains a 1 or a positive indication, only the positive switch under the control of the Beta 1 stage is conductive and thus passes the direct output from the S1 stage of register 10 to network 14. If, on the other hand, the Beta 1 stage contains a 0 or a negative indication, only the negative switch controlled by the Beta 1 stage is made conductive and thus passes the complement output from...