Question 1: Explain what is meant by 'sampling' in digital sound. Why is sampling important for converting sound into digital data?

Answer: Sampling is the process of measuring the amplitude of an analog sound wave at regular intervals to create a series of digital values. It is important because it allows the continuous sound wave to be represented in a form that can be stored and processed by digital devices.

Question 2: A digital sound system uses a sampling rate of 44,100 samples per second. What is this sampling rate called, and why is a high sampling rate necessary?

Answer: This sampling rate is called the Nyquist rate. A high sampling rate is necessary to accurately capture the details of the sound wave and prevent loss of quality or distortion.

Question 3: If a sound is sampled at 8 bits per sample, how many different amplitude levels can be represented?

Answer: 2^8 = 256 levels.

Question 4: Describe how increasing the bit depth (bits per sample) affects the quality of the digital sound.

Answer: Increasing the bit depth allows more amplitude levels to be represented, which results in a more accurate and higher quality sound with less distortion.

Question 5: Complete the truth table for a AND gate with inputs A and B. The table should include headers for A, B, and Output.

Answer: [{"A":0,"B":0,"Output":0},{"A":0,"B":1,"Output":0},{"A":1,"B":0,"Output":0},{"A":1,"B":1,"Output":1}]

Question 6: Draw a logic circuit that uses an OR gate and an AND gate to produce a specific output. The circuit should have two inputs, labeled A and B, and one output.

Answer: A correct sketch would show two inputs leading into an OR gate and an AND gate, with the outputs of these gates connected to a final OR gate or combined as specified. Labels should clearly indicate A and B, and the final output.

Question 7: Sketch a diagram to represent how sound waves are sampled and converted into digital data. Include labels for the wave, sampling points, and digital values.

Answer: A correct sketch would show a continuous wave, points marked at regular intervals (sampling points), and corresponding digital amplitude values indicated at each point.

Question 8: In your own words, explain the difference between analog and digital sound.

Answer: Analog sound is a continuous wave that varies smoothly over time, like natural sound. Digital sound is a series of discrete samples taken from the analog wave, represented as numbers, which can be stored and processed electronically.

Question 9: Describe two advantages of storing sound in digital form instead of analog.

Answer: Digital sound can be easily stored, copied, and transmitted without degradation. It also allows for editing and processing using computers, which is not possible with analog sound.

Question 10: Sketch a simple diagram of a circuit that uses a NOT gate with a single input A and an output labeled B. Show the input and output clearly.

Answer: A correct sketch would show A entering the NOT gate, with an inverter symbol, and B labeled as the output, which is the inverse of A.