Saturday, November 23, 2013

Pulse Code Modulation

PULSE CODE MODULATION Pulse modulation consists of take furrow of latitude information signals and wherefore 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 normal switched telephone network because PCM is smooth to combine digitized vocalise and digital data into a single, high-speed digital signal and play along on it over optical graphic symbol cables. PCM is a technique that is commonly used for digital transmitting. With PCM the pulses atomic number 18 of fixed length and fixed amplitude. PCM is a binary program system of rules where a pulse or lack of pulse at bottom a prescribed time represents logic 0 or logic 1 condition. TRANSMISSION SECTION The band achieve around fall into place limits the frequency of the mate of latitude enter signal to the standard voice band frequency ordinate of 300hz to 3000hz. The sample and find 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 collimate PCM codes.
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These codes are reborn to straight binary data in the parallel to resultant converter and then outputted onto the transmission line as series digital pulses. The transmission line repeaters are placed at prescribed distances to repair the digital pulses. RECEIVER SECTION In the receiver, the serial to parallel converter converts serial pulses received from the tr ansmission line to parallel PCM codes. The ! digital to analog 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 electric circuit that performs the PCM encoding and decoding function is called a codec.If you want to get out a full essay, order it on our website: BestEssayCheap.com

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