Delay systems and methods using a variable delay sinc filter

A method of delaying a received signal, comprising:

• sampling a selected signal with a predetermined clock signal;
• producing the selected signal at a time that is delayed to the extent of a comparison of a reduced frequency clock with a predetermined value;
• and
• delaying production of said selected signal with a second comparison with a second predetermined value of a further reduced frequency clock whose frequency is reduced relative to said frequency of said reduced frequency clock.

A delay system comprising:

• a first filter configured to receive a selected input signal;
• a first mechanism, including a microprocessor, for activating the filter to produce a delayed output signal which is a function of the selected input signal, the first mechanism being settable to produce a predetermined delay according to an input from the microprocessor;
• a second filter configured to receive a signal from said first filter and to apply an additional delay to the signal received by said first filter;
• and
• a second mechanism for activating said second filter to produce a delayed signal which is a function of a signal received from said first filter wherein said second mechanism is settable to produce a predetermined signal delay according to the input from the microprocessor.