ADC-UNIT2

Non linear digital modulation technique in which carrier frequency and phase is continuous is

• FSK

• BPSK

• QPSK

• ASK

Digital modulation technique in which phase changes between 0° and 180° is called as

• QPSK

• BPSK

• ASK

• BFSK

The filter used in reconstruction of original message signal from the modulated signal

• Band stop filter

• low pass filter

• HPF

• BPF

The modulation technique in which the FSK signal gently shifts from one frequency level to another is known as

• Differential FSK

• Continuous PSK

• Differential PSK

• Continuous FSK

For transmission from GSM mobile terminals, the modulation scheme used is

• Gaussian Minimum Shift Keying

• 16-PSK

• QAM

• QPSK

For an BASK modulated signal with a bit rate of 5000 bps,the minimum bandwidth is

• l000Hz

• 5000Hz

• 2000Hz

• 2500Hz

Which modulation technique is called as On-Off keying

• PSK

• BFSK

• QPSK

• ASK

The mod-2 addition in binary codes refers to

• XOR

• AND

• OR

• XNOR

Amplitude Shift Keying (ASK) is very rarely used in Modulators and Demodulators (Modems) because

• It is highly susceptible to noise

• It takes

  care of amplitude only

• It shifts

  only between ON and OFF states

• None of

  the above

In which of the following the frequency of the carrier signal varies based on information in a digital signal?

• ASK

• PSK

• FSK

• QPSK