EET 238 - Mod 9 short answers ?

Describe the three main steps of Analog-to-Digital conversion:

Sampling: Measuring the amplitude of the analog signal at regular intervals. The sampling rate must be at least twice the value of the highest frequency component of the analog signal.

Quantization: Converting each sampled value into a finite set of levels. This step introduces quantization noise due to the rounding off of the amplitude values to the nearest available level.

Encoding: Assigning a binary code to each quantized level,

Describe the four main steps of Digital-to-Analog conversion:

Digital Input: The digital signal, which is a series of binary numbers, represents the digital data to be converted back into an analog format.

Conversion: The digital signal is transformed into an analog signal. A DAC circuit or device, takes the binary numbers as input and generates a corresponding analog voltage or current. The conversion involves mapping each digital code to a specific analog output. The higher the resolution of the DAC, the more accurate the analog output can mirror the original digital signal.

Reconstruction Filter: After the digital-to-analog conversion, a reconstruction filter, is used to smooth out the signal, removing the high-frequency artifacts and preserving the original signal's integrity within its bandwidth.

Amplification and Output: This step adjusts the signal strength to suitable levels for the intended use.

What is Pulse Modulation?

the process of changing a binary pulse signal to represent the information to be transmitted.

What is the difference between Serial/Parallel transmission and Synchronous/Asynchronous

transmission?

Serial and Parallel transmission dictate the data transmission path.

Synchronous and Asynchronous transmission dictate the timing of data transmission

What are the two most common codes used in transmitting digitized data?

ASCII & Hexadecimal

What are the three main types of data modulation?

frequency shift keying (FSK), phase-shift keying (PSK), and quadrature amplitude modulation (QAM)

What are the benefits of an SDR?

• The ability to change the function of the radio by reprogramming it for a different frequency, modulation, or protocols.

• Higher performance over analog radios.

• Smaller lighter radios