Dynamic Analogue=digital converter - includes sample=and=hold circuit and comparator comparing successive values of signal, with comparator output values stored with related times

摘要

The circuit for converting an analogue signal (Y) which varies with time into a digital signal includes an analogue or digital sample-and-hold circuit. This holds the preceding value (yj-1) of the analogue signal and a delay signal (dx) received from a clock. A comparator receives this signal on one input, and the current value (yj) on the other input. A digital recording circuit receives the output of the comparator (Yj) and records this with the associated X value. The clock is re-initialised after each output from the comparator. USE/ADVANTAGE - Dynamic A-D or D-A conversion for use with recorded video signals. Quantity of information to store or transmit minimised as much as possible.