At the receive end of the transmission, the digital signal may need to be
converted back into its analog form. The digital-to-analog (D/A) conversion
consists of two steps .
Each 8-bit word (byte) that enters the decoder results in one PAM signal value.
The decoder: Reads the 8-bit binary word inputs ,creates a sream of 8000 pulses
per second.These pulses have an amplitude of +127 to –127. The filtering
process smoothes out the stream of 8000 pulses per second into an analog
waveform that closely resembles the waveform that was input into the A/D
converter at the originating end. The filter stores a part of each pulse’s energy
and slowly releases it until the next pulse arrives. The filter thus reconstructs the
analog signal at a rate of 8000 times per second.
per second.These pulses have an amplitude of +127 to –127. The filtering
process smoothes out the stream of 8000 pulses per second into an analog
waveform that closely resembles the waveform that was input into the A/D
converter at the originating end. The filter stores a part of each pulse’s energy
and slowly releases it until the next pulse arrives. The filter thus reconstructs the
analog signal at a rate of 8000 times per second.
good and simple explanation... I like your article...and the way you made it.
ReplyDeletethanks buddy ... this was all i learn when i was in third year of engineering.
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