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The main difference between analogĪnd digital modulation is that in case of digital modulation it takes digital Quadrature Amplitude Modulation (QAM), etc. Of digital modulations, i.e., Amplitude Shift Keying (ASK), Frequency ShiftKeying (FSK), Phase Shift Keying (PSK), Quadrature Phase Shift Keying (QPSK), In this article we'll discuss various types Previous article we've talked about need of modulation and we've also talkĪbout analog modulations briefly. P 3 Digital Modulation Techniques (ASK, FSK, and PSK) and its The common examples of digital modulation techniques are ASK, FSK, PSK, etc. In phase modulation, phase of carrier signal varies linearly in accordance with message signal voltage. VSB has a little higher bandwidth than SSB, making it appropriate for video transmission.įrequency Modulation:The carrier signal's frequency varies linearly in response to the voltage variation in the message signal.
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Because of its low bandwidth, SSB is ideal for audio transmission. The bandwidth of SSB is half that of DSB. DSB, SSB, and VSB are common amplitude modulation techniques. To make communication possible, a low frequency message signal is modulated with a high frequency carrier wave using a local oscillator. Now we'll discuss some analogue modulation techniques for band pass signals, including as amplitude modulation, frequency modulation, and phase modulation.Īmplitude Modulation:The carrier signal's amplitude varies linearly with the amplitude of the message signal. It is a method of enhancing transmission frequency while lowering antenna height. As a result, we choose modulation, in which the lower frequency is shifted to the higher frequency. We can observe that the antenna height for reliable 20 KHz band communication should be 3.75 kilometers. Then the height of antenna, Ht, should be More, height of antenna should be smaller and vice-versa for reliableįrequency of a communication band is 20 KHz. Height is inversely proportional to the operating frequency. The wavelength of the working frequency determines the antenna height. We should be aware that antenna height is important for reliable transmission. The signal then travels through the earth's atmosphere until it reaches the receiver. We know that the transmitter antenna emits a specific radiation pattern. However, for long-distance communication, wireless is the best option. For short-range baseband communication, wired communication is sufficient.