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Transversal Filter with Analog Digital Components

IP.com Disclosure Number: IPCOM000089980D
Original Publication Date: 1968-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Crouse, WG: AUTHOR [+3]

Abstract

An electronic filter for analog signals is realized by the substitution of digital electronic circuits for those analog circuits which involve large reactive components such as delay lines or memory. Analog circuits for such arithmetic functions as do not require digital precision are retained.

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Transversal Filter with Analog Digital Components

An electronic filter for analog signals is realized by the substitution of digital electronic circuits for those analog circuits which involve large reactive components such as delay lines or memory. Analog circuits for such arithmetic functions as do not require digital precision are retained.

In this transversal filter, an analog signal is received at input terminal 1 and a series of clock pulses is received at clock terminal 2. Delta-Sigma modulator 3 receives the inputs from terminals 1 and 2. Modulator 3 generates, at its output terminal 4, a series of pulses synchronized with the clock pulses on input 2 and having a frequency proportional to the magnitude of the analog input. These pulses on terminal 4 are passed through a series of storage stages 5 forming a shift register. The output of each stage 5 is connected as an input to the succeeding stage 5. Each Stage 5 also has the clock pulses from terminal 2 as an input. Any pulse appearing on terminal 4 from modulator 3 is passed through the shift register at the clock rate and appears successively at the outputs of stages 5.

Each output terminal is connected through an analog weighting resistor 6 to analog summing device 7 whose output line 8 indicates the analog sum of the weighted outputs of stages 5. Operational amplifier 9, responsive to the signal on output line 8, generates an input signal on line 10 to Delta-Sigma demodulator 11 whose output circuit 1...