Flashcards
topic 1 digital data digital technology
Flashcards do conjunto (54)
- 1what is datadata is meaningless it is raw unorganised facts and figures without a context or meaning
- 2what is informationinformation is data that has been processed and presented in a meaningful way therefore making it useful
- 3what is a bit equivalant toa binary digit 0 or 1
- 4what is a nibble equivelent to4 bits
- 5what is a byte equivalent to8 bits
- 6what is a kilobyte equivalent to1024 bytes
- 7what is a megabyte equivalent to1024 kilobytes
- 8what is a gigabyte equivalent to1024 megabytes
- 9what is a terabyte equivalent to1024 gigabytes
- 10what is the data type intergeran interger stores positive or negative whole numbers
- 11what is the data type realreal stores positive or negative decimal numbers
- 12what is the data type date/timeallows a date/time to be stored. it can be set to record date/time data in a specific format.
- 13what is the data type charactercharacter stores a sequence group of characters together as one value. it can contain a combination of letters,numbers and symbols
- 14what is the data type stringstores a sequence or group of characters together as one value. it can contain a combination of letters, numbers and symbols
- 15what is the data type booleanstores true or false only
- 16what are images converted into for a computer to understand and process thembinary
- 17what are digital images made up ofpixels
- 18what is each pixel stored asbinary value
- 19when a digital image is displayed on a computer screen it is divided into what and arranged into whatthousands of pixels arranged into rows and columns
- 20what is a pixela pixel is the smallest unit which is usually represented by a dot or square of a digital image that can be displayed and edited on a computer screen
- 21what is the resolutionthe number of pixels used to create a digital image
- 22what does a higher pixel count result in and what is it calleda better quality of an image which is called higher resolution
- 23what does image resolution tell us and what is it usually mesured init tells us the quality of the image and is mesured in dots-per-inch
- 24what happens when there is higher resolution but what does higher resolution requirethere is more pixels but higher resolution images require more storage space
- 25these two numbers 1024 and 1536 is represented by whatimage resolution
- 26what number represents the number of pixels displayed horizontally1024
- 27what number represents the number of pixels displayed vertically1536
- 28what is colour depth or bit depth and what is the term for itthe number of bits used to represent the colour of a single pixel this is reffered to as bits per pixel
- 29what happens to the quality of the colour when there is more bits used and whythe better the quality of the colour because more colours can be encoded
- 30the number of bits used for each pixel determines what and what is it known ashow many colours we can use it is known as colour depth
- 31the more bits per pixel the greater the what and the more bits we need to whatthe greater the colour depth the more bits we need to store the image
- 32how does image resolution affect file sizehigher resolution image will fit a large number of pixels into a small space enabling very clear and realistic images to be stored and veiwed. however this will lead to larger file sizes as every pixels colour code and metada will have to be stored resulting in higher overall image loading and processing times on computers and higher overall image transfer times across communication links
- 33give me all the features of bitmap graphicsstores details about every individual picture element in the image. they tend to be large files which take up more memory and storage space than vector images. can be compressed which may lead to a loss in quality. large bitmap images can take a long time to open and load on a page. pixillation occurs when the image is enlarged. bitmap images are less precise than vector images where the quality of the image depends on its resolution. bitmap images use less processing power than vector images
- 34give me all the features of vector based graphicsstores information about the components or objects that make up an image. tend to have a much smaller file size than an equivelant bitmap images vector images takes up less memory and storage space. can be more easily resized and stretched than bitmap images without losing clarity. due to vector graphics smaller size vector graphics tend to load quicker than bitmap images. vector images can be enlarged and edited without losing image quality and pixillation does not occur. vector images are more precise than bitmap images where the quality of the image does not depend on resolution. vector images use more processing power than bitmaps.
- 35what is sample ratethe sample rate is the number of audio sound samples captured every second to represent the sounds digitally and is measured in hertz
- 36what is bit depthbit depth is the number of bits used to store each sound smaple. higher quality sound requires a higher bit depth
- 37what is bit ratebit rate refers to the quality of data measured in bits that is processed in a given amount of time. this is usually in kilobits per second
- 38what is an ADCanolouge to digital converter
- 39what is data portabilitydata portability is the ability to transfer data from one computer to another or from one software application to another without having to re-enter data
- 40what does jpeg stand forjoint photographic expert group
- 41what does tiff stand fortagged image file format
- 42what does png stand forportable network graphics
- 43what does gif stand forgraphics interchange format
- 44what does midi stand formusical instrument digital interface
- 45what does mpeg stand formoving motion picture expert group
- 46what does avi stand foraudio video interleaved
- 47what does wma stand forwindows media audio
- 48what does wav stand forwindows audio wave form
- 49what does csv stand forcomma seperated value
- 50what does rtf stand forrich text format
- 51what does pdf stand forportable document format
- 52what does lossless compressionmaintains the quality of a file meanimng no data is lost
- 53what is lossy compressionreducing the file size by removing some of the data for example reducing the number of colours used in a large resolution image
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- GCSE Computing FlashCards sobre topic 1 digital data digital technology, criado por Shea Mcgovern em 16-04-2024.
- Criado por
- Shea Mcgovern
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