Question

question 1 5

1. of the circuits listed below, the one that is most likely to be found in a cd player is a (n)................
2. analog - to - digital converter 2) programmable logic device 3) digital - to - analog converter 4) spld 5) none of the above
3. which edge in figure 1 is the trailing edge?

figure 1

1. 1 2) 2 3) 3 4) both 1 and 3 5) none of the above.
2. a periodic digital waveform................
3. has a duty cycle 2) has both a high and low levels 3) repeats itself at a fixed interval 4) all of the above 5) none of the above.
4. on a negative - logic pulse, the trailing edge is the..........................
5. high - to - low transition 2) negative - going edge 3) positive - going edge 4) falling edge 5) none of the above
6. which circuit converts data from serial to parallel form?
7. multiplexer 2) comparator 3) demultiplexer 4) encoder 5) none of the above

Explanation:

1. In a CD - player, digital - to - analog converter is used to convert the digital audio data stored on the CD into an analog signal that can be played through speakers.
2. The trailing edge of a waveform is the edge that follows the leading edge. In a rectangular waveform, the falling edge (transition from high to low) is the trailing edge, which is edge 3 in Figure 1.
3. A periodic digital waveform has a duty cycle (ratio of high - time to the total period), has both high and low levels, and repeats itself at a fixed interval.
4. On a negative - logic pulse, the trailing edge is the positive - going edge (transition from low to high).
5. A demultiplexer takes a single input and distributes it to one of several outputs in parallel form, effectively converting serial data to parallel data.

Answer:

1. 3) digital - to - analog converter
2. 3) 3
3. 4) all of the above
4. 3) positive - going edge
5. 3) Demultiplexer