Pulse Code Modulation

PULSE CODE MODULATION Pulse modulation consists of take furrow of latitude information signals and then converting those samples into discrete pulses and transporting the pulses from a source to terminal over a physical contagion medium. PCM is the preferred means of communications at bottom the man switched telephone network because PCM is smooth to combine digitized vocalise and digital data into a single, high-speed digital signal and perish on it over optical graphic symbol cables. PCM is a proficiency that is commonly used for digital transmission system. With PCM the pulses atomic number 18 of fixed length and fixed amplitude. PCM is a binary program brass instrument where a pulse or lack of pulse in spite of appearance a prescribed time represents logic 0 or logic 1 condition. TRANSMISSION SECTION The band devolve around fall into place limits the frequency of the analog foreplay signal to the standard voice band frequency feed of 300hz to 3000hz. The sample and clutch 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 fit PCM codes.

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

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