Method for generating digital actual velocity signals

摘要

A method for generating digital actual velocity signals in a positioning system for the write/read heads of a magnetic disk storage utilizes a position signal received from a servo-head to derive digital signals having edges marking the data track centers. Reset signals for a digital counter counted up by clock pulses are formed from the digital position signals and, upon recognition of a zero passage of the position signal, the content of the counter is sampled and the counter is reset. The position signal is then compared with a stored optimum deceleration curve and a coil is operated through a series of gates to appropriately position the write/read heads.