Howtosignalprocessing
- What is digital phase modulation?
- What is baseband digital modulation?
- What is baseband and passband modulation?
- What is digital bandpass modulation?
What is digital phase modulation?
Digital phase modulation is a versatile and widely used method of wirelessly transferring digital data. In the previous page, we saw that we can use discrete variations in a carrier's amplitude or frequency as a way of representing ones and zeros.
What is baseband digital modulation?
In baseband modulation the information is formated so that it is represented by digital symbols. Then pulse waveforms are assigned that represent these symbols. These waveform can then be transmitted over a cable. Baseband signals are not appropriate for propagation through many transmission media.
What is baseband and passband modulation?
Baseband transmission sends the information signal as it is without modulation (without frequency shifting) while passband transmission shifts the signal to be transmitted in frequency to a higher frequency and then transmits it, where at the receiver the signal is shifted back to its original frequency.
What is digital bandpass modulation?
Digital passband modulation is based on variation of the amplitude, phase, or frequency of the sinusoidal carrier, or some combination of these parameters. Amplitude-shift keying (ASK) was probably the first type of digital modulation to be practically applied.
