| 摘要 |
The device for reducing the noise in a speech signal transmission system includes a perturbation-detecting circuit 1 and, between the input E and the output S, a direct path and a delayed path which are in parallel and are connected to the inputs of a switch 2 controlled by this perturbation-detecting circuit 1. The device also includes a circuit 5 for measuring the period of tunefulness of the speech signal associated with a delay-control circuit 6 which sets the delay introduced by the delayed path at a value equal to or a multiple of the period of tunefulness so that during perturbations, the modulated signal is replaced by the earlier signal delayed by an integer number of periods of tunefulness. The invention applies in particular to speech transmission in a packet transmission network on different frequency levels. <IMAGE>
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