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Additional resources for 10.Communications
Fast, a half-wave rectifier can be used instead. A low pass filter (LPF) is used after the full-wave rectifier to average out the envelope of the input signal over a short period of time— that is, at a syllabic rate with a 10 ms to 20 ms time constant. At the heart of a compandor is a variable loss device through which both compression and expansion are performed. At a compressor, the input speech signal to the variable loss device is divided by the output of the LPF. At an expandor, the input speech signal to the variable loss device is multiplied by the output of the LPF.
Indeed, cochannel interference is the primary interference mechanism and is the major factor that limits the capacity of any wireless system that employs frequency reuse. Cells that reuse the same frequency are commonly referred to as cochannel cells. Wireless engineers place cochannels at a sufficiently large distance from one another so that the emissions from one cell do not cause excessive interference into any subscriber in another cochannel cell. We call this distance the reuse distance. One can clearly see the tradeoff between reuse distance, capacity, and interference.
Therefore, there is a difficult tradeoff between increasing and reducing speech signal levels. All these problems can be solved by the use of a compandor. ’’ According to whether a compandor operates on an analog signal or a digital signal, it can be categorized as an analog compandor or a digital compandor. An analog compandor operates on a continuous time analog signal and compresses the dynamic range of a speech signal continuously at a syllabic rate. A digital compandor operates on a discrete time signal and adapts to the variations in sampled speech signal levels dynamically by varying the quantization level.