A memory module - is just another name for a memory chip.
Amplitude Modulation.
Amplitude Modulation
Amplitude Modulation
They could mean a lot of things, but in the context of each other they probably stand for Amplitude Modulation and Frequency Modulation (two different methods for sending an audio signal using radio waves) respectively.
am is amplitude modulation, fm, frequency modulation
FM means frequency modulation, and AM means amplitude modulation.
pulse width modulation is nothing but changing on and off time period of a waveform without changing its frequency
For a radio, it would mean "amplitude modulation." For time, it would mean "ante meridian."
Amplitude Modulation, the method of sending information through radio frequencies.
AM - Amplitude Modulation FM - Frequency Modulation
modulation
Frequency Modulation and Phase Modulation