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Consider an n-minute speech is recorded and has the following spectrum, where n is 10. The audio recording is saved as a digital file using PCM with 256 levels.

Consider an n-minute speech is recorded and has the following spectrum, where n is the 3rd digit of your student ID number, set n=10 if the 3rd digit is 0. The audio recording is saved as a digital file using PCM with 256 levels. Amplitude (V) h =10 60 20 4000 Frequency (Hz) (a) What is the minimum sampling rate required? What will happen if the rate is not reached? (10 marks) (b) By using the sampling rate in (a), calculate the size of the digital file produced. (10 marks) (C) Suppose all 256 levels represent positive amplitude. Quantization is done by rounding to the nearest level. A sample has amplitude 25V. State the bits of this sample. (5 marks) Consider an n-minute speech is recorded and has the following spectrum, where n is the 3rd digit of your student ID number, set n=10 if the 3rd digit is 0. The audio recording is saved as a digital file using PCM with 256 levels. Amplitude (V) h =10 60 20 4000 Frequency (Hz) (a) What is the minimum sampling rate required? What will happen if the rate is not reached? (10 marks) (b) By using the sampling rate in (a), calculate the size of the digital file produced. (10 marks) (C) Suppose all 256 levels represent positive amplitude. Quantization is done by rounding to the nearest level. A sample has amplitude 25V. State the bits of this sample

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