Track crossing discriminating circuit

Details Track crossing discriminating circuit Track crossing discriminating circuit

G - Physics

11

B

G11B 7/085 (2006.01) G11B 7/09 (2006.01) G11B 21/10 (2006.01)

Patent

CA 2334921

Out of the read signal an auxiliary signal (Sa) having a relatively low frequency content is generated. The apparatus comprises for the auxiliary signal (Sa) first hold means (8) for generating a first hold signal (H1) and second hold means (9) for generating a second hold signal (H2). The first hold means (8) are adapted for temporarily maintaining the value of the first hold signal (H1) at a value substantially corresponding to the bottom value of the auxiliary signal augmented by an addition value (Sa+.DELTA.) and the second hold means for temporarily maintaining the value of the second hold signal (H2) at a value corresponding to a top value of the auxiliary signal diminished by a subtraction value (Sa-.DELTA.).

Selon l'invention, on génère à partir du signal de lecture un signal auxiliaire (Sa) comportant un contenu de fréquence relativement basse. Pour le signal auxiliaire (Sa), le dispositif comprend d'une part un premier organe de maintien (8) permettant de générer un premier signal de maintien (H1), et d'autre part un second organe de maintien permettant de générer un second signal de maintien (H2). Les premiers organes de maintien (8) sont conçus pour maintenir temporairement la valeur du premier signal de maintien (H1) à une valeur correspondant sensiblement à la valeur de base du signal auxiliaire, augmentée d'un complément (Sa+.DELTA.), et les seconds organes de maintien permettent de maintenir temporairement la valeur du second signal de maintien (H2) à une valeur correspondant à la valeur maximale du signal auxiliaire, diminuée d'une valeur soustractive (Sa-.DELTA.).

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