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Need help with VHDL code for metal detector

I am working on a metal detector at the moment but cant figure out how to implement it my VHDL code.

ENTITY sensor IS
port ( metaldetector : in std_logic;
metal : out std_logic;
END ENTITY sensor;

As long as there isnt any metal close to the sensor 'metaldetector' gets pulses on a 6.1kHz frequency. So as long as the 'metaldetector' keeps getting pulses the out port 'metal' should be '0'.

When there is a pulse missing (or multiple pulses) 'metal' should become '1' until the next pulse.

It shouldnt be that hard to make a code that can do that, but i just cant figure it out. Any help would realy be great!


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