| 摘要 |
The present invention relates to a device for detecting loss of synchronisation in a digital transmission, characterised in that it is placed respectively on at least one of the two paths X or Y of the output from a coherent demodulator which, along two quadrature axes, provides respectively on each of these two paths a baseband signal train, and which comprises: - means 23 of generating pulses corresponding to each change of sign of the relevant signal train; - means 27 of delaying the recovered clock H in order to allow the latter to be picked out between the said pulses; - and means 24 for detecting any lack of synchronism between these pulses and the recovered clock once the latter has been delayed. Application in particular to the field of microwave frequencies. <IMAGE>
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