SCROLLING SIGNAL GENERATION METHOD

摘要

A scrolling signal generation method is provided. A look-up table has been previously established. By inquiring the look-up table, a controlling unit judges whether the received plural phase signals can be collaboratively defined as a scrolling signal. If one of the phase signals received by the controlling unit is lost because of the noise, the controlling unit compares the plural phase signals with plural scrolling data of the look-up table. If the plural phase signals comply with plural scrolling data of the look-up table, the plural phase signals are defined as the scrolling signal. Consequently, the optical scroll wheel using the scrolling signal generation method of the present invention can be smoothly operated without causing the erroneous action.

主权项

1. A scrolling signal generation method for an optical wheel mouse, said optical wheel mouse comprising an optical scroll wheel, a light emitter and a light receiver, said scroll wheel being rotatable by a user, said light emitter generating an optical signal, said optical signal passing through said scroll wheel being received by said light receiver, said light receiver outputting plural phase signals according to said optical signal, said scrolling signal generation method comprises steps of:
judging whether said phase signal from said light receiver is changed; judging whether a number of times said phase signal is changed reaches a predetermined value, wherein if said number of times said phase signal is changed reaches said predetermined value, a first look-up table is inquired, wherein said first look-up table contains plural first scrolling data, and each of said plural first scrolling data is defined by plural phase signals; and judging whether said plural phase signals generated in response to rotation of said optical scroll wheel comply with said plural first scrolling data of the first look-up table, wherein if said plural phase signals comply with said plural first scrolling data of the first look-up table, a scrolling signal corresponding to said plural phase signals is outputted, wherein if said plural phase signals do not comply with said plural first scrolling data of the first look-up table, said number of times said phase signal is changed is zeroed and said current phase signal is recorded, and said step of judging whether said phase signal from said light receiver is changed is performed again.