Cg (a) Pulse representation
(b) Symbol representation
Fig. 11.1. Binary bits represented as (a) pulse and (b) symbol.
In Fig. 11.1 shown, each three digit binary number that specifies a quantized sample value is called a word. Cg is called guard time between pulses.
Bit rate. In the noisy channel, there is an absolute maximum limit for the bit rate. This limit arises because the difference between two adjacent signal levels become comparable to the noise level when the number of signal level is increased. For noisy channel, data rate is calculated by
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