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Translation equipment pilots | Line equipment pilots | Definitions | Thermal noise | Noise due to unlinearity | Measurement of noise contributions | Overload | Overload measurement. | Noise contributions | Line sections |

Compandor noise advantage

  1. A loud ripping noise rent the air; two of the Monster Books had seized a third and were pulling it apart.
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  3. ADVANTAGES OF COMPUTER DATA PROCESSING
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  6. Measurement of noise contributions

From Figure 20.16 it can be seen that while no speech is transmitted the noise power will be subject to an attenuation of 25dB at the expandor output.

The theoretical noise advantage will therefore be given by Equation 20.38.

However, the circuit noise while speech power is transmitted is virtually unaffected by the compression/expansion process and there is no advantage. During talking, therefore, the conversation is subject to the full effect of the system noise. The effect of this noise produces an impairment to speech intelligibility that detracts from the companding advantage by an estimated 5dB.

Overall advantage is therefore given by Equation 20.39.



Compander characteristics | Transmultiplexers
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