audio electronics

Question	Answer
Sound:	Pressure waves in the air that our ears are sensitive to (vibrations at frequencies between 20- 20,000 Hz), Waves are converted into electrical signals that we recognize as sound
Audio signals-	have frequencies within the range of human hearing sensitivity
Microphones:	Converting audio signals to electrical signals, I.E. Cell phones, hearing aids, etc.
Speakers:	Converting electrical signals to audio signals, I.E. tweeter (small), mid- range (can reproduce most, except very low and very high frequencies), woofer/ subwoofer (large)
Power Amplifiers:	Amplification of audio signals
Digital Compression:	reduces the size of a digital word or bitstream so it may be transmitted faster or stored in a smaller memory, I.E. MP3/4 and AAC
Light-	form of energy, comes from atoms, produced by plasma, heat, LEDs, visible electromagnetic waves
Resolution:	Total number of pixels (in megapixels)- Number of pixel columns (width) x Number of pixel rows (height)
Digital images	produced by charge- coupled devices (converting brightness to number of electrons to digital code), stored on flash- memory or HDDs, visible through image and video.

Resource summary

	Created by Lillian Mehler over 9 years ago