ELL727 weekly pop quiz-4

What is the minimum number of quantization bits required for the maximum quantization error to be within 0.5% of the maximum acceptable peak-to-peak signal amplitude for a uniform quantizer?

The output SNR of a 3-bit uniform quantizer for a full-scale sinusoidal signal (i.e. having maximum acceptable amplitude) is

• 32

• 48

• 64

• 96

The improvement in SNR (in dB) obtained after quadrupling the number of quantization levels for an ADC is

• 6

• 12

• 18

• 24

Consider a PCM channel with maximum bit rate of 36 kbps. What is the maximum number of quantization levels possible for ADC of a 3.2 kHz band-limited audio signal to be sent over this channel?

• 16

• 32

• 64

• 128

A digital transmitter sends 125 different voice channels using TDM after ADC. Each analog voice signal is band-limited to 4 kHz and sampled at 125% of the Nyquist rate with 256 levels of quantization. What is the data rate (in Mbps) of the transmitter?