1a_Encoding_S_10

1a_Encoding_S_10 - Signal Encoding Data Encoding is: The...

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1 Signal Encoding The process of preparing data for efficient and accurate transmission. Analog-to-digital conversion. The conversion process will not change the information contained in the analog data. Once the data is in digital form, it can be encoded as a sequence of voltage levels. Data Encoding is:
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2 Original Signal Quantizing of sampled amplitudes S(t) S(t) t t Recovery of Original Signal S(t) t
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3 For instance, we want to use only 8 bits to store each sample, and the maximum possible value of the analog signal is 10 , then we can quantize the signal into multiples of 10/256 (0.03906). Each number will be represented as an 8-bit binary number between 0 and 255 . To approximately reconstruct the original analog signal, each 8-bit sample must be multiplied by 0.03906. When sending a digital signal over a transmission line, the sampling rate of the signal determines the bandwidth required for successful transmission . Level detection and regeneration of a digital signal allows the signal to be transmitted with a significantly smaller bandwidth than the absolute bandwidth of the signal.
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4 PCM Signal Input Voltage V max 0.25· V max 0.5· V max 0.75· V max 64 128 192 256 Conversion from signal voltage to PCM level in DS1 telephone system.
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5 The Nyquist criterion determines the sampling rate necessary to capture all the information of an analog signal with a discrete sequence (taken by sampling the signal at a certain rate). “The signal must be sampled at a rate of
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1a_Encoding_S_10 - Signal Encoding Data Encoding is: The...

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