2931963
Description
Flashcards by Lillian Mehler, updated more than 1 year ago
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Created by Lillian Mehler
almost 9 years ago
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| 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. |
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