Codecs

Embedded System

This set of Embedded Systems Multiple Choice Questions & Answers (MCQs) focuses on “Codecs”.

1. From which of the following words does codecs is derived?
a) coder
b) decoder
c) coder-decoder
d) coder-encoder

2. Which codec is used in digital audio?
a) A-law
b) µ-law
c) linear
d) PCM

3. Which of the following have the same quantisation step throughout the range?
a) linear
b) PCM
c) DPCM
d) ADPCM

4. Which is used in the telecommunication applications which has a limited bandwidth of 300 to 3100 HZ?
a) linear codec
b) logarithmic codec
c) PCM
d) DPCM

5. Which codec is used in the UK?
a) a-law
b) µ-law
c) linear codec
d) PCM

6. What does PCM stand for?
a) pulse codec machine
b) pulse code modulation
c) peripheral code machine
d) peculiar code modulation

7. Which of the following conversion is performed by using a lookup table?
a) DPCM
b) ADPCM
c) Between DPCM and ADPCM
d) Linear cdec and a-law

8. What does DPCM stand for?
a) differential pulse code modulation
b) data pulse code modulation
c) dynamic pulse code machine
d) dynamic pulse code modulation

9. Which of the following have a 16-bit digital dynamic range?
a) PCM
b) DPCM
c) linear codec
d) logarithmic codec

10. How many types of logarithmic codecs are used commonly?
a) 2
b) 3
c) 4
d) 5

11. What does ADPCM stand for?
a) address differential pulse code modulation
b) adaptive differential pulse code modulation
c) address dynamic pulse code machine
d) adaptive dynamic pulse code modulation

12. Which of the following uses a non-linear quantisation value?
a) PCM
b) DPCM
c) ADPCM
d) linear codec

13. Which of the following works by increasing the dynamic range?
a) logarithmic codec
b) linear codec
c) DPCM
d) PCM

14. Which device can make the PWM operation easier?
a) timer
b) software
c) hardware
d) transistor

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