Abstract
Advanced digital technology has made possible the development of a new digital automatic television test-signal measuring system, which has been designated ANSWER II. Five years ago, the first ANSWER system was not put into production because its analog methods were too complex (digital technology was not yet available). The heart of the ANSWER II system is an 8-bit, 20-MHz analog-to-digital converter (ADC) developed by Tektronix, Inc., for NTSC and PAL television. The latest integrated-circuit technology was used to achieve the best possible performance. During the development of the ADC, microprocessors (computers-on-a-chip) and programmable read only memories (PROMs) became commercially available and were incorporated into the design. One important specification of the system is that it employs digitization at four times the subcarrier frequency. Specific measurement programs may be changed merely by changing the PROM(s). Several important applications are envisioned and the possibility is noted that ANSWER II may ultimately replace the oscilloscope and vectorscope for many broad case engineering applications.
Published Version
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