Español: Diagramas con el aspecto del surco de un disco fonográfico analógico grabado verticalmente. Con este sistema, el estilete que graba la matriz, se desplaza verticalmente, en sentido perpendicular a la dirección del surco, generando una sinusoide cuya profundidad es variable. La flecha azul indica cómo se desplaza el estilete al grabar el disco.
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