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Definition
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Definition
| works by vibrating a needle onto tin coil when spoken into the diaphragm. Etched line is analog wave |
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Definition
| Gramophone ten years later improved the design by recording analog wave onto flat record |
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Term
Emile Berliner
Flat Record
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Definition
| spiral groove made mass reproduction easier |
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Definition
| analog wave is read electronically rather then vibrating into a diaphragm |
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Definition
| Sine wave vibrating at a frequency like 500 mhz |
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Definition
Fidelity was not good-alot of interference
Consistent usage wore down analog groove |
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Term
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Definition
| Create recordings with high fidelity and perfect reproduction |
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Term
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Definition
| converts the analog wave into a stream of numbers and records the numbers instead of waves |
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Term
ADC
ANALOG-TO-DIGITAL CONVERTER |
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Definition
| changes analog waves to digital recordings(numbers) |
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Term
DAC
DIGITAL TO ANALOG CONVERTER |
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Definition
| whats used to convert digital recording back to analog waves. Its amplified and fed to speakers to produce sound |
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Definition
| Sampling Rate & Sampling Precision |
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Definition
| controls how many samples are taken per second |
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Definition
| Controls how many different gradiations are possible when taking samples |
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Definition
| increase sampling rate and precision |
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Term
ADC are stored as _____
on a CD |
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Definition
bytes
- 2 bytes represent 65,000+ gradiations
-CD holds 780,000,000+ bytes |
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Definition
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Definition
-Video camera takes picture 30 frames/sec
-Camera Rasterizes the scene, turns pic to pixels |
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Definition
| signal that contains color and intensity of each pixel |
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Term
| What can you do with a composite video signal or sound signal? |
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Definition
1. broadcast radio waves
2. record them with a VCR
3. transmit them through a cable tv system |
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Term
Composite Video Signal is transmitted as____
? |
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Definition
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Term
| Sound is transmitted as____? |
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Definition
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Term
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Definition
1. digital cameras work at higher res than analog cameras
2. digital transmission
3. digital display at much higher resolution |
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Term
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Definition
| resolution- it controls the crispness and detail in the picture |
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Definition
| number of pixels on a screen |
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Definition
| updating the whole picture frame every 30th of a second |
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Definition
| you receive single composite video signal and seperate sound signal |
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Definition
| broadcaster sends a 19.39mbps stream of digital data |
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| What can broadcasters do to the digital stream they send out? |
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Definition
divide it into subchannels
this is called multicasting |
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| How is Multicasting possible? |
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Definition
| dividing the 19.39mbs data stream into smaller chunks say 4-4.85mbps channels (lower quality) |
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Definition
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Term
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Definition
| includes 720i,720p,1080i & 1080p |
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Term
| what does the P and I stand for when discussing SD and HD? |
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Definition
p- progressive
i-interlaced |
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Term
| Analog TV ratio vs HDTV ratio |
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Definition
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Term
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Definition
| digitizing and compressing image/text/audio into a smaller format |
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Term
| Broadcastors use____ for Digital Compression |
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Definition
MPEG-2
allows them to choose screen size and bit rate when encoding |
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Term
| Variables that determine how picture will look |
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Definition
usage of data stream
all 19.39 will have best the less you allocate the lower the quality |
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Term
SDTV sets have ____ _____ built in
where as HDTV does not(always) |
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Definition
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Term
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Definition
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Term
| First Glimpse of 3-d technology |
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Definition
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Term
| Secret to 3-D tv and movies |
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Definition
| with two different lenses on a frame each eye sees a different variation of the same image but the focal point being the screen tricks your mind to think its one image with depth |
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Term
| Two Categories of Glasses |
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Definition
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Term
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Definition
rely on simple technology like anaglyph lenses
lens with 2 diff colors |
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Definition
| dont distort the color of the image |
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Term
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Definition
| views two sets of images that alternate at very high speeds |
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Term
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Definition
| tiny lenses on the base side of a special film. displays 2 sets of same image. |
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Term
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Definition
| requires a sweet spot and requires broadcaster to make a certain image |
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