Question 1: Explain how sound waves are represented digitally in a computer. Include the terms 'sampling' and 'bit depth' in your answer.

Answer: Digital sound representation involves sampling, where the sound wave is measured at regular intervals, and each sample's amplitude is stored as binary data. Bit depth determines the number of bits used for each sample, affecting the sound quality and dynamic range.

Question 2: Describe what happens to the quality of sound when the sampling rate is increased. Provide a reason for this change.

Answer: Increasing the sampling rate allows the sound to be captured more accurately, resulting in higher sound quality because the waveform is sampled more frequently, reducing distortion and loss of detail.

Question 3: What is the purpose of using binary data (ones and zeros) to store sound information in a computer?

Answer: Binary data allows digital systems to store, process, and transmit sound information efficiently using electronic circuits that operate with two states, enabling accurate and reliable digital representation of analog sound signals.

Question 4: Complete the truth table for a NOT gate:

Answer: Input | Output 0 | 1 1 | 0

Question 5: Draw a logic circuit for an AND gate using basic logic gates. Label all components clearly.

Answer: A correct sketch would show two input lines entering an AND gate symbol, with a single output line. The AND gate symbol is a D-shaped figure with two inputs on the left and one output on the right.

Question 6: Sketch a diagram to illustrate how a digital system converts an analog sound wave into binary data. Include labels for the main stages.

Answer: The sketch should include: an analog wave entering a sampling device, a quantization process converting samples into discrete levels, and a binary data output. Label these stages accordingly.

Question 7: Explain why higher bit depth results in better quality sound in digital recordings.

Answer: Higher bit depth increases the number of possible amplitude levels, reducing quantization error and resulting in more accurate and detailed sound reproduction.

Question 8: Describe what a sampling rate of 44.1 kHz means and why it is commonly used in digital audio.

Answer: A sampling rate of 44.1 kHz means the sound wave is sampled 44,100 times per second. It is commonly used because it accurately captures the audible frequency range for humans and balances quality with data size.

Question 9: Draw a truth table for a XOR gate with two inputs.

Answer: Input A | Input B | Output 0 | 0 | 0 0 | 1 | 1 1 | 0 | 1 1 | 1 | 0

Question 10: Sketch a block diagram showing how digital sound is stored, processed, and played back by a computer.

Answer: The diagram should include stages such as: sound source, analog-to-digital converter, digital storage, digital-to-analog converter, and speaker or output device. Label each stage clearly.