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# Digital Signal Processing Quiz

Created by
@MemorableIndium

### What is the effect on the deviation d of an FM signal when it is passed through a mixer?

Remains unchanged

### What is the output signal from a DSB-SC modulator?

Neither FM nor PM signal

### What is the purpose of an amplitude limiter in FM receivers?

To remove amplitude variations due to noise

### What is the modulation index of an FM wave given by s(t)=20cos(8π×106t+9sin(2π×103t))?

<p>9</p> Signup and view all the answers

### What is true about Frequency Modulation?

<p>All of the above</p> Signup and view all the answers

### What does the amount of frequency deviation in FM signal depend on?

<p>Amplitude of the modulating signal</p> Signup and view all the answers

### What is the modulation index of FM given by?

<p>μ = frequency deviation/ modulating frequency</p> Signup and view all the answers

### What happens to the frequency deviation Δ when the modulating frequency is doubled?

<p>Remains unchanged</p> Signup and view all the answers

### What is the result of the amplitude of the modulating signal being greater than the amplitude of the carrier?

<p>Distortion</p> Signup and view all the answers

### What is the ratio of the modulating signal voltage to the carrier voltage called?

<p>Modulation index</p> Signup and view all the answers

### What type of frequency modulation is generated using a VCO?

<p>Indirect FM</p> Signup and view all the answers

### When does over-modulation occur in amplitude modulation?

<p>Modulating signal voltage &gt; Carrier voltage</p> Signup and view all the answers

### What is the modulating signal voltage if the maximum and minimum voltages on the wave are 10v and 5v respectively?

<p>2.5v</p> Signup and view all the answers

### What is the circuit used for producing DSB-SC called?

<p>Modulator</p> Signup and view all the answers

### What modulation technique is used to convert analog signal into digital signal?

<p>Pulse code modulation</p> Signup and view all the answers

### What is the bandwidth of a carrier wave with a modulating frequency varying between 900kHz and 1100kHz?

<p>200KHz</p> Signup and view all the answers

### What is the expression for bandwidth BW of a PCM system?

<p>BW&gt; = 2nfm</p> Signup and view all the answers

### Which of the following is an indirect form of frequency modulation?

<p>Armstrong modulator</p> Signup and view all the answers

### What is the characteristic of a uniform quantizer in PCM?

<p>The step size remains the same</p> Signup and view all the answers

### What is the maximum bandwidth of the message in a PCM system with a 7-bit binary encoder and a bit rate of 49*10^6bps?

<p>7Mkbps</p> Signup and view all the answers

### In which type of modulation is the amplitude of the pulse train varied?

<p>Pulse amplitude modulation</p> Signup and view all the answers

### What is the signal to quantization noise ratio for a signal with a highest frequency component of 3.2MHz and peak to peak value 6 volt, transmitted using PCM with 512 quantization levels?

<p>36.98dB</p> Signup and view all the answers

## Study Notes

### Modulation Techniques

• Pulse Code Modulation (PCM) converts analog signal into digital signal
• Other modulation techniques: AM modulation, FM modulation

### Bandwidth of PCM System

• Expression for bandwidth BW: BW > nfm, where n is the number of bits per sample and fm is the modulating frequency

### Uniform Quantization

• Step size remains same in uniform quantization process
• The quantizer has linear characteristics

### PCM System

• Bit rate of the system is equal to 49*10^6bps
• Maximum bandwidth of message: 7Mbps

### Pulse Amplitude Modulation

• Amplitude of the pulse train is varied in pulse amplitude modulation

### Signal to Quantization Noise Ratio

• For a signal with highest frequency component of 3.2MHz and peak to peak value 6 volt, signal to quantization noise ratio is 36.98dB

### Amplitude Modulation

• The ratio between the modulating signal voltage and the carrier voltage is called modulation index
• Over-modulation occurs when the amplitude of the modulating signal is greater than the amplitude of the carrier

### Voltage-Controlled Oscillator (VCO)

• VCO is used to generate indirect FM

### DSB-SC Modulator

• The circuit used for producing DSB-SC is called a modulator

### Frequency Modulation

• The two types of angle modulation are phase and frequency modulation
• Phase modulation is an indirect form of frequency modulation
• The amount of frequency deviation is proportional to the amplitude of the intelligence signal in an FM signal

### FM Signal

• The effect on the deviation d of an FM signal when it is passed through a mixer: doubles
• In Frequency Modulation, amplitude of the carrier remains same, frequency of the carrier varies in accordance with the modulating signal, and the number of side bands are infinite
• The modulation index of FM is given by μ = frequency deviation/ modulating frequency
• According to Carson’s rule, Bandwidth B and modulating frequency fm are related as B = 2(Δf + fm) Hz

• Encoding, decoding and quantizing circuitry of PCM is complex
• PCM require large bandwidth as compared to the other systems

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## Description

Test your knowledge of digital signal processing concepts, including modulation techniques, pulse code modulation, and quantization process.

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