Unlike others software for facsimile reception, EASY FAX does not require any type of interface to connect the audio of the receiver to the computer; in each case , to increase the sensitivity of the system, the insertion of a signal-squarer is to prefer. To receive amplitude modulated sub-carrier signals such as weather-satellite signals) a voltage-to-frequency converter is required; it must be preceded by a band pass filter tuned on the sub-carrier frequency (usually 2400Hz or 1200Hz),the output of this one have to be rectified before the introduction into the same converter
