Classify the following based on the category of signals they use.
radio waves, television waves, sound waves, Computers, Digital Phones, Digital pens
Analog signal- radio waves, television waves, sound waves
Digital signal- Computers, Digital Phones, Digital pens
<START_INST>Classify the following based on the category of signals they use.
radio waves, television waves, sound waves, Computers, Digital Phones, Digital pens<END_INST><START_CTX><END_CTX><START_A>Analog signal- radio waves, television waves, sound waves
Digital signal- Computers, Digital Phones, Digital pens<END_A>