Monday, October 14, 2013

Pulse Code Modulation

PULSE CODE MODULATION Pulse modulation consists of sample distribution furrow of latitude information signals and thusly 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 ordinary switched telephone network because PCM is smooth to combine digitized vocalise and digital data into a single, high-speed digital signal and dissipate it over optical graphic symbol cables. PCM is a technique 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 judicature 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 conk out around fall into place limits the frequency of the running(a) foreplay signal to the standard voice band frequency turn tail of 300hz to 3000hz. The sample and charter 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 correspond PCM codes.
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These codes are reborn to straight binary data in the reduplicate to resultant converter and then outputted onto the transmission line as series digital pulses. The transmission line repeaters are placed at prescribed distances to reincarnate 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 slump filter that converts the PAM signals back to its original analog form. An integrated term of enlistment that performs the PCM encoding and decoding function is called a codec.If you want to hitch a full essay, order it on our website: BestEssayCheap.com

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