Browse Prior Art Database

Analog To Digital Converter

IP.com Disclosure Number: IPCOM000093844D
Original Publication Date: 1966-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Melas, M: AUTHOR

Abstract

Analog-to-digital converter 10 encodes an audio analog signal into a train of pulses. The latter recreate the analog signal when applied to an earpiece or other output 11 having a defined response characteristic.

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Analog To Digital Converter

Analog-to-digital converter 10 encodes an audio analog signal into a train of pulses. The latter recreate the analog signal when applied to an earpiece or other output 11 having a defined response characteristic.

In converter 10, the response of the earpiece or other output is duplicated in feedback circuit 12. Resistances R1, R2 and R3 comprise the time-dependent detection levels of the response of circuit 12 and are proportional to ordinates E1, E2, E3... of the response curve. Thus, converter 10 compares 14, the input voice signal, with the feedback at each bit time and generates a 1 if the input is greater and a 0 if the feedback is greater.

The voice signal is approximated by a sum of u(t-ti) functions generated at each bit time in which t(i) is the time difference between successive bits. This is accomplished by comparing 14, the voice input, to the sum of the ordinates of u(t-ti) functions and generating a 1 or 0 bit according to the sign of that difference.

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