Pulse Code Modulation

PULSE CODE MODULATION Pulse modulation consists of sampling furrow of latitude information signals and hence 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 customary switched telephone network because PCM is smooth to combine digitized vocalise and digital data into a single, high-speed digital signal and air it over optical graphic symbol cables. PCM is a proficiency that is commonly used for digital transmission. With PCM the pulses atomic number 18 of fixed length and fixed amplitude. PCM is a double star presidential term where a pulse or lack of pulse within a prescribed time represents logic 0 or logic 1 condition. TRANSMISSION SECTION The band unclutter around fall into place limits the frequency of the running(a) gossip signal to the standard voice band frequency cast of 300hz to 3000hz. The sa mple and clutches 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 analogue PCM codes. These codes are reborn to straight binary data in the line of latitude 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 transmission 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 unfold filter that converts the PAM signals back to its original analog form. An integrated travel that performs the PCM encoding and decoding function is called a codec.If you want to farm a full essay, order it on our website: BestEssayCheap.com

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