System for digitizing and interfacing analog data for a digital computer

A system for interfacing a plurality of amplitude modulated signals with a digital computer comprising:

• a. an analog multiplexer fed by the plurality of amplitude modulated signals;
• b. and analog-to-digital converter fed by the analog multiplexer and read into the computer upon a read command and with the analog-to-digital converter generating a conversion complete signal;
• c. a timing circuit generating an initializing switch command for advancing the analog multiplexer, a convert command to the analog-to-digital converter, and a read command to the computer;
• d. an altering reference signal source having the same frequency as the plurality of amplitude modulated signals;
• e. a sample counter fed by the real time clock generating a start pulse for initializing the multiplexer to input initial data to the analog-to-digital converter;
• f. a real time clock;
• g. a synchronizing circuit fed by the alternating reference signal source and the real time clock, the output thereof feeding the timing circuit;
• and
• h. an address counter activated by the timing circuit for entering an initial address into the computer and advanced by signals from the timing circuit upon receiving a conversion complete signal from the analog-to-digital converter, and with the address counter generating a stop command upon completion of digital read-in.