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The process of translating the informati...

The process of translating the information conta-ined by the low base band signal to high frequencies is called

A

Detection

B

Modulation

C

Amplification

D

Demodulation

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • Assertion : The information contained in our original low frequency baseband signal is to be translated into high or radio frequencies before transmission. Reason: For transmitting a signal, the antenna should have a size comparable to the wav elength of the signal.

    A
    A and R both are true and R is correct explaination of A
    B
    A is true but R is wrong
    C
    A is wrong but R is true
    D
    Both A and R are wrong

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    Assertion : The information contained in our original low frequency baseband signal is to be translated into high or radio frequencies before transmission. Reason: For transmitting a signal, the antenna should have a size comparable to the wave length of the signal.

    A: Modulator is an essential component of a transmitter. R: Modulator superimposes a low frequency message signal on a high frequency carrier wave.

    Briefly explain the three factors which justify the need of modulating low frequency signal into high frequencies.

    Write two factors which justify the need of modulating a low frequnecy signal into high frequencies before transmission .

    The efficient transmission of signals is achieved by superimposing electrical audio signals on a high frequency carrier wave (the process is known as modulation). When the amplitude of high frequency carrier wave is changed in accordance with the intensity of modulating signal, it is called amplitude modulation. The extent to which the amplitude of carrier wave is changed by the signal is described by modulation factor. It is given as m="Amplitude change of carrier wave"/"Amplitude of unmodulated carrier wave" Let a carrier wave is represented by V_c=V_c cos omega_ct Let the modulation factor be m, the maximum change in amplitude of carrier wave is mV_c So, modulating signal can be represented as v_m=mV_c cosomega_mt So, the amplitude of modulated wave is =V_c+mV_c cosomega_m t Using this value, the instantaneous voltage of modulated wave is E=V_c cos omega_c t+ (mV_c)/2 cos (omega_c+omega_m)t + (mV_c)/2 cos (omega_c-omega_m ) t The above wave contains three frequencies namely, f_c, f_c+f_m and f_c-f_m . The frequencies f_c+f_m and f_c-f_m are called side band frequencies , USB and LSB respectively. The fraction of total power carried by side band frequencies is

    The process by which anything grouped into convenient categories based on some easily observable characters is called.

    The efficient transmission of signals is achieved by superimposing electrical audio signals on a high frequency carrier wave (the process is known as modulation). When the amplitude of high frequency carrier wave is changed in accordance with the intensity of modulating signal, it is called amplitude modulation. The extent to which the amplitude of carrier wave is changed by the signal is described by modulation factor. It is given as m="Amplitude change of carrier wave"/"Amplitude of unmodulated carrier wave" Let a carrier wave is represented by V_c=V_c cos omega_ct Let the modulation factor be m, the maximum change in amplitude of carrier wave is mV_c So, modulating signal can be represented as v_m=mV_c cosomega_mt So, the amplitude of modulated wave is =V_c+mV_c cosomega_m t Using this value, the instantaneous voltage of modulated wave is E=V_c cos omega_c t+ (mV_c)/2 cos (omega_c+omega_m)t + (mV_c)/2 cos (omega_c-omega_m ) t The above wave contains three frequencies namely, f_c, f_c+f_m and f_c-f_m . The frequencies f_c+f_m and f_c-f_m are called side band frequencies , USB and LSB respectively. If modulation factor is 100% , the amplitude change of carrier wave is

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