Digital Signal Processing Reference
In-Depth Information
a. Determine the oversampling rate if a 12-bit ADC chip is used to replace the audio system.
b. Draw the block diagram.
12.16. Consider an audio system with the following specifications:
Audio input frequency range: 0
e
15 kHz
ADC resolution
¼
6 bits
Oversampling rate
¼
45 MHz
a. Draw the block diagram.
b. Determine the actual effective ADC resolution (number of bits per sample).
12.17. Consider the following specifications of an oversampling DSP system:
Audio input frequency range: 0
e
4 kHz
First-order SDM with a sampling rate of 128 kHz
ADC resolution in SDM
¼
1 bit
a. Draw the block diagram using the DSP model.
b. Determine the equivalent (effective) ADC resolution.
12.18. Consider the following specifications of an oversampling DSP system:
Audio input frequency range: 0
e
20 kHz
Second-order SDM with a sampling rate of 160 kHz
ADC resolution in SDM
¼
10 bits
a. Draw the block diagram using the DSP model.
b. Determine the equivalent (effective) ADC resolution.
12.19. Consider the following specifications of an oversampling DSP system:
Signal input frequency range: 0
e
500 Hz
First-order SDM with a sampling rate of 128 kHz
ADC resolution in SDM
¼
1 bit
a. Draw the block diagram using the DSP model.
b. Determine the equivalent (effective) ADC resolution.
12.20. Consider the following specifications of an oversampling DSP system:
Signal input frequency range: 0
e
500 Hz
Second-order SDM with a sampling rate of 16 kHz
ADC resolution in SDM
¼
8 bits
a. Draw the block diagram using the DSP model.
b. Determine the equivalent (effective) ADC resolution.
12.21. Given a bandpass signal with a spectrum shown in
Figure 12.48
,
and assuming the
bandwidth
B ¼
5 kHz, select the sampling rate and sketch the sampled spectrum
ranging from 0 Hz to the carrier frequency for each of the following carrier
frequencies:
a.
f
c
¼
30 kHz
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