| 摘要 |
The device comprises means 3, 4 and 5 of amplification for a band of a microphonic signal 1 corresponding to a chick's cry of distress, an envelope detector 6, a discriminator 7 and 8 of the duration over which the envelope signal exceeds a first predetermined amplitude threshold, a high-pass filter 10, a detector 11 of the presence of an output signal of amplitude greater than a second threshold, and a decision logic unit 9. Application to the automatic sorting of chicks according to their sex. <IMAGE>
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