Figure 5-21. VE Card - Waveform Diagram

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

voltage to the positive inhibit switch. The polarity of the

to maintain a decreasing error voltage condition. Once

bit 1 (one or zero) signal applied to the two switches

the error voltage equals or exceeds the filtered audio

determines which switch is enabled to apply either the

signal voltage, the error signal polarity out of the

negative drive or the positive drive signal to the

comparator switches from a one to a zero, or from a zero

integrator. The integrator, in turn, responds to the

to a one, thus interrupting the successive string of the

applied drive voltage and produces the reconstructed

same polarity pulses from the comparator. The boost

analog signal that is applied through a buffer to the

enable output from the logic decoder output then returns

comparator.

to its normal decreased drive state until the next series of

three ones or zeros is generated from the comparator to

5-255. When the decoder logic generates the boost

indicate the need for a faster correction voltage change.

enable signal, the active negative or positive drive signal

applied to the integrator increases in amplitude to

5-256. Figure 5-21 illustrates the relationship between

produce a sharper slope for the drive signal applied to

the data output pulses (MDTOXX-) and the

the integrator. The integrator output, in turn, has a

reconstructed analog signals from the integrator. The

sharper rising or falling slope that enables the

figure also shows how the reconstructed analog signal

reconstructed analog signal voltage to increase at a

effectively tracks the filtered audio signal.

When

greater rate, thus decreasing the error output from the

decoded in a demultiplexer, the reconstructed analog

comparator. As shown in figure 5-21, the reconstructed

signal will be a true reproduction of the original filtered

analog voltage waveform requires continuous corrections

audio

signal.

Figure 5-21. VE Card - Waveform Diagram

5-64