Browse Prior Art Database

Digital Autocorrelation and Crosscorrelation Function Generator

IP.com Disclosure Number: IPCOM000098053D
Original Publication Date: 1961-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Shelton, GL: AUTHOR

Abstract

When autocorrelating, switches 2 are set to represent the input word. Ring counter 4 conditions and's 6 at times 1 - 4 and applies bits 20... 2/3/ to shift register 8. The clock pulses are delayed one half unit of time by delay 10 and are applied to shift the data in register 8. And's 12...24 are connected to various register 8 outputs through or's 26 and 28 and and 30. Flip flop 32 controls the operation of 30 and conditions it when autocorrelating under the control of switch 34. When an n digit word is autocorrelated, n non redundant and's acting as multipliers are required. The outputs of and's 12...24 are connected to counters 36...48 functioning as adders.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 88% of the total text.

Page 1 of 2

Digital Autocorrelation and Crosscorrelation Function Generator

When autocorrelating, switches 2 are set to represent the input word. Ring counter 4 conditions and's 6 at times 1 - 4 and applies bits 20... 2/3/ to shift register 8.

The clock pulses are delayed one half unit of time by delay 10 and are applied to shift the data in register 8. And's 12...24 are connected to various register 8 outputs through or's 26 and 28 and and 30. Flip flop 32 controls the operation of 30 and conditions it when autocorrelating under the control of switch 34. When an n digit word is autocorrelated, n non redundant and's acting as multipliers are required. The outputs of and's 12...24 are connected to counters
36...48 functioning as adders. The discrete autocorrelation function of a discrete input function is thus generated by a group of additions of products of discrete portions of the function according to the formula f( ) = Ef(t) f(t + t').

When crosscorrelating, recycling shift register 52 is serially loaded with the second word, determined by switches 50, through and's 54. Switch 34 is placed at CROSS, resetting flip flop 32 to provide a 1 out put to condition and's 56 and
58. Cycle control flip flop 60 is initially reset for a first cycle by the reset pulse and is set for a second cycle at time -5- by a signal from ring counter 4. One respective input of all and's 12...24 is connected to one stage of the shift register
8. The last stage of recycling register 52 is connected...