Fundamental digital modulation methods. If the symbol rate (also known as the baud rate) is symbols/second (or baud), the data rate is bit/second. For example, with an alphabet consisting of 16 alternative symbols, each symbol represents 4 bits. Thus, the data rate is four times the baud rate. Aug 28, · In pulse width modulation, there are different types of modulation for analog and digital as shown below: PCM: Pulse Code Modulation for Analog Modulation. PPM: Pulse Position Modulation for Digital Modulation. PDM: Pulse Duration Modulation for Digital Modulation. PAM: Pulse Amplitude Modulation for Digital Modulation. There are two types of modulation analog and digital. Analog modulation delas with the voice, video and regular waves of base band signals. Where as digital modulations are with bit streams or symbols from computing vevices as base band signals.
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