Signal original form to a waveform expressed as a current ("I") or a voltage ("V"), or an electromagnetic waveform, for example, an optical signal or radio transmission. Once expressed as an electronic signal, the signal is available for further processing by electrical devices such as electronic amplifiers and electronic filters, and can be transmitted to a remote location by electronic transmitters and received using electronic receivers. In Electrical engineering programs, a class and field of study known as "signals and systems" (S and S) is often seen as the "cut class" for EE careers, and is dreaded by some students as
Signal generator been embedded hardware units, but since the age of multimedia PCs, flexible, programmable software tone generators have also been available. In June 1928, the General Radio 403, was the first commercial signal generator ever marketed. It supported a frequency range of 500Hz to 1.5MHz. Also, in April 1929, the first commercial frequency standard was marketed by General Radio with a frequency of 50KHz. A function generator is a device which produces simple repetitive waveforms. Such devices contain an electronic oscillator, a circuit that is capable of creating a repetitive waveform. (Modern devices may use digital signal processing to synthesize waveforms,