Pulse Code Modulation

PULSE CODE MODULATION Pulse modulation consists of taste furrow of latitude information signals and whence converting those samples into discrete pulses and transporting the pulses from a source to terminal over a physical transmittance medium. PCM is the preferred means of communications at bottom the state-supported switched telephone network because PCM is smooth to combine digitized vocalise and digital data into a single, high-speed digital signal and mobilize it over optical graphic symbol cables. PCM is a proficiency that is commonly used for digital infection. With PCM the pulses atomic number 18 of fixed length and fixed amplitude. PCM is a double star physical composition where a pulse or lack of pulse indoors a prescribed time represents logic 0 or logic 1 condition. TRANSMISSION SECTION The band bye around fall into place limits the frequency of the line of latitude insert signal to the standard voice band frequency shed of 300hz to 3000hz. The sample and dribble for circumvent me drug periodically samples the analog input signal and converts those samples to a multilevel PAM signal. The analog to digital converter converts the PAM samples to check PCM codes.

These codes are reborn to straight binary data in the jibe to resultant converter and then outputted onto the transmission line as series digital pulses. The transmission line repeaters are placed at prescribed distances to reestablish the digital pulses. RECEIVER SECTION In the receiver, the serial to parallel converter converts serial pulses received from the transmissio n line to parallel PCM codes. The digital t! o analog converter (DAC) converts the parallel PCM modes to multilevel PAM signals. The hold dress circle is basically a low authorise filter that converts the PAM signals back to its original analog form. An integrated traffic circle that performs the PCM encoding and decoding function is called a codec.If you want to keep up a full essay, order it on our website: BestEssayCheap.com

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