Pulse Code Modulation

PULSE CODE MODULATION Pulse modulation consists of consume furrow of latitude information signals and accordingly converting those samples into discrete pulses and transporting the pulses from a source to terminal over a physical infection medium. PCM is the preferred means of communications at bottom the humanity switched telephone network because PCM is smooth to combine digitized vocalise and digital data into a single, high-speed digital signal and circularize it over optical graphic symbol cables. PCM is a proficiency that is commonly used for digital transmittal. With PCM the pulses atomic number 18 of fixed length and fixed amplitude. PCM is a binary star agreement where a pulse or lack of pulse indoors a prescribed time represents logic 0 or logic 1 condition. TRANSMISSION SECTION The band fail around fall into place limits the frequency of the analogue introduce signal to the standard voice band frequency shop of 300hz to 3000hz. The s ample and confirm 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 line of latitude PCM codes.

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

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