A filter is a device, instrument, or substance used to separate a flow (of liquid, gas, information, a signal, etc.) from unwanted impurities based on specific characteristics. // A device that allows the passage of—or blocks—electric currents, electromagnetic or sound waves of a specific frequency, etc.
A filter is a device, instrument, or substance used to separate a flow (of liquid, gas, information, a signal, etc.) from unwanted impurities based on specific characteristics. // A device that allows the passage of—or blocks—electric currents, electromagnetic or sound waves of a specific frequency, etc.
