ADC Flashcards
A transducer:
Channels the energy emitted by the Tesseract
Always crosses between analogue and digital domains
Converts a signal from one form into another
Is a digital device used to measure voltage
Converts a signal from one form into another
e.g.
● Sound
Microphone, Loudspeaker, Buzzer
Ultrasonic transducer
Quantization process is generally __________ and results in information __________ .
reversible, gain
irreversible, gain
irreversible, loss
reversible, loss
irreversible, loss
If an input signal to an ADC raises slightly above Vref, then it is
Measured as a 0
Ignored until the voltage drops below Vref
Destroyed
Clipped
Clipped
A signal that ranges from 0v to 3.3v is fed into a 7-bit ADC. What is the representation of sampled analog voltage of 0.12V? (Assume the error is between 0 to 1 least significant bit)
000 0110b
0x12
001 0010b
0x04
0x04
Nyquist’s theorem states that perfect reconstruction may be possible if the signal is sampled how fast?
With at least 2x as many bits as the signal should have
At least 2x faster than the highest frequency component
As fast as the ADC can sample
At least 48kHz
At least 2x faster than the highest frequency component
An ADC should quantise a continuous signal differently to how it quantises a single value.
True False
False
An ADC (Analog-to-Digital Converter) quantizes a continuous signal in the same way regardless of whether it’s quantizing a continuous signal or a single value.
The quantization process of an ADC is consistent, and it treats continuous signals and individual values the same way. When the ADC converts an analog signal into a digital representation, it breaks the continuous range of the analog signal into discrete levels and assigns the closest discrete level to the analog value at each moment in time. Whether it’s quantizing a continuous signal or a single value, the process is based on the same principle of dividing the signal into discrete levels.
Select which of the following occurs within an ADC (tick all that apply):
1) Transduction
2) Quantisation
3) Sampling
4) Inversion
2) Quantisation
3) Sampling
When referring to an ADC, quantisation means:
The number of discrete levels used to represent a sample
The sample is converted to analogue by a DAC
The sample rate at which a sample is converted to digital
The biggest (maximum) value that the sample can reach
The number of discrete levels used to represent a sample
“discrete levels” means that something is broken down or divided into distinct, separate steps or values
It takes a continuous range of analog values (like a smooth curve) and divides it into specific, separate values that it can represent digitally. These specific values are the “discrete levels,” and the ADC assigns the closest discrete level to the analog value it’s measuring. It’s like rounding a number to the nearest whole number.
What is the typical sample rate and data size of a CD-quality audio signal?
44.1kHz and 16-bits
256kHz and 32-bits
20-bits and 24kHz
8-bits and 48kHz
44.1kHz and 16-bits
What is Quantisation?
The number of discrete levels used to represent the amplitude of a signal.
More levels means better accuracy, but bigger numbers.
defines how a value is stored in binary. e.g.: CD-quality audio: 16-bits
