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Amplitude Modulation is analogue signal (carrier) amplitude changing.
Analog generators contain frequency-sensitive circuits for self-excitation condition at the specified frequencies.
As a rule arbitrary waveform generator is a sort of function generator capable of generating arbitrary waveforms. The majority of modern arbitrary waveform generators use direct digital synthesis (DDS) to generate an output signal, i.e. they are digital.
Amplitude shift keying is a signal transform method when the carrying oscillation amplitude changes abruptly depending on the discrete data messages.
DDS is a rather new frequency synthesis method which appeared in early 70s, last century. All the methods described have been available to the developers for decades but only recently such a close attention has been paid to DDS. Nowadays the appearance of cheap micro circuits with DDS and convenient development tools make them attractive for various application fields.
In frequency Modulation a carrier is more high-frequency comparing to the information signal and frequency-modulated signal amplitude is steady.
Frequency shift keying is a signal transform method when the carrying oscillation frequency changes abruptly depending on the discrete data messages.
As a rule function generator is a sort of a waveform generator capable of generating different signal waveforms (there are usually 3 typical signals: sine, square, triangle/sawtooth).
Keying is the transition process of one or several high-frequency signal (which is called carrier) parameters under the law of low-frequency discrete data message.
Logic sequence generator, pattern generator is a technical device, generator which forms signals to work with digital electronic circuits on several outputs at the same time.
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