Pulse-code modulation (PCM) is a method used to digitally represent sampled analog signals.It is the standard form of digital audio in computers, compact discs, digital telephony and other digital audio applications. Pulse amplitude modulation is the simplest form of modulation. In the continuous-wave modulation, a high frequency sine wave is … Hence, digital modulation techniques have a greater demand, for their capacity to convey larger amounts of data than analog ones. Pulse Amplitude Modulation is one of the kinds of modulation techniques used in signal transmission. There are two types of sampling techniques for transmitting messages using pulse amplitude modulation, they are FLAT TOP PAM: The amplitude of each pulse is directly proportional to instantaneous modulating signal amplitude at the time of pulse occurrence and then keeps the amplitude of the pulse for the rest of the half cycle. According to the Inventors Hall of Fame, B.M Oliver and Claude Shannon are the inventors of PCM as described in 'Communication System Employing Pulse Code Modulation,' (EN) US2801281, United States Patent and Trademark Office, Stati Uniti d'America. Communication is achieved over a transmitter and a receiver through signals. Adaptive differential pulse-code modulation (ADPCM) is a variant of differential pulse-code modulation (DPCM) that varies the size of the quantization step, to allow further reduction of the required data bandwidth for a given signal-to-noise ratio.. The PWM signal is the control input of the PWM fan. Continuous-wave Modulation. Depending upon the modulation techniques used, they are classified as shown in the following figure. filed in 1946 and 1952, granted in 1956. These signals carry the information through modulation. Pulse width modulation (PWM) fans are DC fans with an extra wire for PWM. The types of modulations are broadly classified into continuous-wave modulation and pulse modulation. These modulation techniques are classified into two major types: analog and digital or pulse modulation.Prior to discussing further the different types of modulation techniques, let us understand the importance of modulation. : N-ary Pulse Code Modulation. In a PCM stream, the amplitude of the analog signal is sampled regularly at uniform intervals, and each sample is quantized to the nearest value within a range of digital steps. Digital Modulation provides more information capacity, high data security, quicker system availability with great quality communication. Actually, the multidimensional multiplexed pulse outputs have been demonstrated in mode-locked lasers , and show novel performance in multiple-comb techniques such as dead-band-free frequency measurement , long ambiguity range of distance measurement and the balance of resolution and acquisition speed in the spectroscopy , . PWM fans are 4-pin fans where the fourth wire sends a PWM signal to the fan motor.
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