What is Audio?

An audio signal is a representation of sound typically as an electrical voltage. Audio signals have frequencies in the audio frequency range of roughly 20 to 20000 Hz (the limits of human hearing). Audio signals may be synthesized directly or may originate at a transducer such as a microphone musical instrument pickup, phonograph cartridge, or … Read more

What is ATM?

An automated teller machine or automatic teller machine (ATM), also known as an automated banking machine(ABM), cash machine, cashpoint, cash line, or colloquially hole in the wall is an electronic telecommunications device that enables the customers of a financial institution to perform financial transactions without the need for a human cashier, clerk or bank teller.