Test on the topic of coding graphic information. Test “Information coding. How many different encodings of letters of the Russian alphabet are there?
Question 1
A. 1 file
B. 1 bit
C. 1 byte
D. 1 KB
Question 2
What is 1 byte equal to?
A. 10 bits
B. 10 KB
C. 8 bit
D. 8 points
Question 3
A. 10,000 bits
B. 1,024 bytes
C. 10 KB
D. 1,000 bits
Question 4
A. 1 page of text
Question 5
A. Analog and discrete
B. Vector and analog
C. Discrete and vector
Question 6
A. point
B. inch
C. pixel
D. centimeter
E. raster
Question 7
C. electron beam
Question 8
A. 2 bytes
B. 4 bit
C. 8 bit
D. 4 bytes
E. 1 KB
F. 1 byte
Question 9
A. 100 bits
B. 400 bits
C. 800 bits
D. 400 bytes
E. 100 bytes
Question 10
A.N=2^i
B. N=2*i
C.I=N*2
D.2=N^i
E.I=N^2
Question 11
Color depth is...
Question 12
Basic colors of the RGB palette:
A. red, blue and green
B. blue, yellow, green
Question 13
Basic colors of the CMYK palette:
D. blue, yellow, red
E. The color palette is formed by setting the values of color hue, saturation and brightness
Question 14
Basic colors of the HSB palette:
D. blue, yellow, red
Question 15
A. sampling
B. formalization
C. redirection
D. discredit
Tasks
How much video memory is needed to store three pages of images, assuming that the display resolution is 640 by 480 pixels and the number of colors used is 24?
It is known that the video memory of a computer has a capacity of 512 KB. Screen resolution is 640 by 480 pixels. How many screen pages will be simultaneously accommodated in video memory with a palette of 256 colors?
A raster graphics file contains a black and white image (without grayscale) with a size of 100 by 100 pixels. How much memory is required to store this file?
The drawing was constructed using a palette of 256 colors on a monitor screen with a graphic resolution of 1024 by 768. Calculate the amount of memory required to store this drawing.
What is the information volume of a book if it contains 200 pages of text (each page has 50 lines of 80 characters and 10 color pictures). Each drawing is constructed at a graphic monitor resolution of 800 by 600 pixels with a palette of 16 colors.
The video memory capacity is 1 MB. The display resolution is 800 by 600 pixels. What is the maximum number of colors that can be used if the video memory is divided into two pages?
TEST “Information Coding”
Question 1
The smallest unit of information measurement is...
A. 1 file
B. 1 bit
C. 1 byte
D. 1 KB
Question 2
What is 1 byte equal to?
A. 10 bits
B. 10 KB
C. 8 bit
D. 8 points
Question 3
A raster graphics file contains a black and white image (without grayscale) with a size of 100 x 100 pixels. What is the information volume of this file?
A. 10,000 bits
B. 1,024 bytes
C. 10 KB
D. 1,000 bits
Question 4
The file containing...
A. 1 page of text
B. black and white drawing 100 X 100 pixels
C. audio recording lasting 1 minute.
D. video clip lasting 1 minute.
Question 5
Name the forms for presenting graphic information.
A. Analog and discrete
B. Vector and analog
C. Discrete and vector
Question 6
The smallest element of the screen surface for which address, color and intensity can be set is:
A. point
B. inch
C. pixel
D. centimeter
E. raster
Question 7
A pixel on a monitor screen represents:
A. the minimum area of the image that can be independently assigned a color
B. binary code of graphic information
C. electron beam
D. a collection of 16 phosphor grains
Question 8
To store a 256-color image, the encoding of one pixel is allocated:
A. 2 bytes
B. 4 bit
C. 8 bit
D. 4 bytes
E. 1 KB
F. 1 byte
Question 9
A raster graphics file contains a black and white image with 16 shades of gray, 10 x 10 pixels in size. What is the information volume of this file?
A. 100 bits
B. 400 bits
C. 800 bits
D. 400 bytes
E. 100 bytes
Question 10
The number of colors in the palette (N) and the amount of information required to encode each point (I) are related and can be calculated using the formula:
A.N=2^i
B. N=2*i
C.I=N*2
D.2=N^i
E.I=N^2
Question 11
Color depth is...
A. the amount of information that is used to encode the color of one point in an image
B. the amount of information that is used to encode the color of the entire image
C. specific amount of information needed to produce the color in an image
Question 12
Basic colors of the RGB palette:
A. red, blue and green
B. blue, yellow, green
C. red, yellow and green
D. cyan, yellow and magenta
E. The color palette is formed by setting the values of color hue, saturation and brightness
Question 13
Basic colors of the CMYK palette:
A. red, yellow, purple
B. yellow, cyan, magenta
C. red, blue, green
D. blue, yellow, red
E. The color palette is formed by setting the values of color hue, saturation and brightness
Question 14
Basic colors of the HSB palette:
A. red, green, blue
B. The color palette is formed by setting the values of color hue, saturation and brightness
C. yellow, magenta, cyan
D. blue, yellow, red
Question 15
Converting a graphic image from analogue to discrete form is called...
A. sampling
B. formalization
C. redirection
D. discredit
Lesson objectives:
- Educational– repetition of the concepts raster, pixel, color depth, palette;
- establishing connections between the values of color depth and the number of colors in the palette; application of the obtained connections to calculate the amount of computer memory required to store the raster image; Developmental
- – improvement of mental and cognitive activity of students, development of thinking, attention, memory, imagination of students. Educational
– developing independent work skills and interest in the subject.
- Lesson objectives:
- remember what a pixel or raster is, what basic colors are used to obtain the color of a point on the monitor screen;
- repeat the rules for presenting data on a computer;
- find out on what parameters the image quality on the monitor screen depends (screen resolution, pixel color depth);
- remember and consolidate the formula for finding the amount of video memory per graphic image;
- analyze ways to solve problems from the State Examination and the Unified State Examination on this topic (A15);
- develop the skill of independent work.
Lesson type: lesson of repetition and consolidation of knowledge and skills
Materials and equipment: computer class, projector; presentation for the lesson, test, cards.
Lesson format: conversation, practical work to solve problems, frontal, individual forms of work.
Teaching methods: explanatory and demonstration, practical.
Lesson plan:
- Organizational moment (1 min).
- Setting the lesson goal (2 min).
- Repetition of covered material (10 min)
- Formation of skills and abilities in solving problems. Individual work on cards (18 min)
- Practical work on a PC (7 min.)
- Independent work of students. Test (5 min).
- D/z (1 min).
- Summarizing. Reflection (1 min).
DURING THE CLASSES
1. Organizational moment. Teacher's opening speech(1 min.)
The field of computer science that studies methods and means of creating and processing images using software and hardware computing systems is called computer graphics.
Data visualization is used in a variety of areas of human activity: computed tomography (medicine), visualization of the structure of matter, vector fields, etc. (scientific research), clothing modeling, development, not to mention the fact that many of you They love to play computer games, where high-quality images are indispensable!
Depending on the method of image formation, computer graphics are usually divided into raster, vector, and fractal.
Today in the lesson we will review the basic concepts on the topic of graphics, we will solve problems on the topic “Coding raster graphic information”, preparing for the State Examination, we will do a little practical work in the Gimp graphics editor and answer theory test questions.
2. Setting the goal of the lesson. Updating knowledge(2 minutes.)
Today in the lesson we will look at tasks on encoding graphic information.
In tasks of this type the following concepts are used:
- video memory volume,
- graphics mode,
- color depth,
- screen resolution,
- palette.
In all such problems, you need to find one or another quantity.
Video memory – This is a special RAM in which a graphic image is formed. In other words, in order to receive a picture on the monitor screen, it must be stored somewhere. That's what video memory is for. Most often, its value is from 512 KB to 4 MB for the best PCs with the implementation of 16.7 million colors.
3. Repetition of the material covered(10 min.) (Annex 1 )
– What determines the quality of the image? (Depending on resolution and point encoding depth)
– What is screen resolution? (Resolution – the number of dots vertically and horizontally of the screen)
– What is the dot color coding depth? (Color depth is the amount of information that is used)
– In what units is information measured?
– How to find the amount of video memory required to store an image:
V= x*y*i, where x *y is the number of pixels, and i (bit) is the color depth of the point
– What formula relates the color depth of a point and the number of colors in the palette? (N=2 i)
– A little math: 2 1 =2, 2 2 =4, ..., 2 8 =256 (write on the board)
Orally:
Exercise 1. Determine the number of pixels of an image on a monitor screen with a resolution of 800x600. (Answer: 480000)
Answer: V = 10 * 8 * 1 = 80 bits
– What is the size of this image?
– How much video memory is needed to encode one point?
– And for the whole image?
Task 3.
However, it is generally accepted today to represent a black and white image as a combination of dots with 256 shades of gray - that is, to encode one point of such an image you need 8 (256 = 2 8) bits or 1 byte
Calculate the amount of video memory required to store a black and white image of the form
Answer: V = 10 * 8 *8 = 640 bits
– How is the coding of these two images different? (Dot color depth)
– Let’s compare two graphic images:
– What can you say about the quality of these images? How can you explain the difference?
– It turns out that the size of the first one is 369 * 204, and the second one is 93 * 51 pixels. This means that the quality of a graphic image depends on the number of dots (pixels) of which it consists: the more dots, the higher the quality.
The most common color depths are 4, 8, 16, 24, or 32 bits.
Task 5. Fill in the table with the appropriate values
| Color depth (I) | Number of colors (N) | Possible options |
| 4 | 16777216 | |
| 8 | 65 536 | |
| 16 | 16 | |
| 24 | 256 | |
| 32 | 4294967296 |
4. Formation of skills and abilities in solving problems(18 min.)( Annex 1 )
Individual student work(Appendix 2 )
1. The RGB color model uses 3 bytes to encode one pixel. The photo, measuring 2048x1536 pixels, was saved as an uncompressed file using RGB encoding. Determine the size of the resulting file.
1) 3 kilobytes 2) 3 megabytes 3) 9 kilobytes 4) 9 megabytes
Given: Solution:
x*y=2048*1536 V= x*y*i=2048*1536*3bytes= 9437184 bytes=9216 KB = 9 MB
i=3 bytes
V – ?
2. To store a raster image measuring 128*128 pixels, 4 kilobytes of memory were allocated. What is the maximum possible number of colors in the image palette?
1) 8 2) 2 3) 16 4) 4
Solution: i=V/x*y=4*1024*8/(128*128)=2 N=4
3. Specify the minimum amount of memory (in kilobytes) required to store any 64*64 pixel bitmap image if the image is known to have a palette of 256 colors. There is no need to store the palette itself.
V= 64*64*8=32768 bits = 4096 bytes = 4 KB
Answer: 4 KB
4. To store a raster image of 64*64 pixels, 512 bytes of memory were allocated. What is the maximum possible number of colors in the image palette?
Given: Solution:
x*y= 64*64 V=x*y*i; i=V/(x*y)=512*8 bits/(64*64)= 4096 bits/4096=1bit
V= 512 bytes N=2 i = 2
N – ?
5. Answer: 2 colors
Given: Solution:
The display operates with a 256-color palette in 640*400 pixel mode. Encoding an image requires 1250 KB. How many pages of video memory does it take up?
640*400 N=256, i=8 bits, V=1250*1024*8bit=10240000 bits; V= 1250 KB V/(640*400*8)=10240000 bits/(640*400*8)bits =
5 pages
N=256 Answer: 5 pages.
6. How many pages?
How much video memory is needed to store two image pages, provided that the display resolution is 640 * 350 pixels and the number of colors used is 16? Solution: N=16, i=4 bits, V= 640*350*4*2 bits= 179200bit=224000bytes=
218.75 KB
7. ( Answer: 2) 218.75 KB ) ORALLY
8. The palette contains 8 colors. What binary code can the color green be encoded in? Answer: 3) 010
Given: Solution:
The resolution of the graphic display is 800*600. Blue color is encoded with binary code 011. The video memory capacity is 750 KB. How many pages does the computer's video memory contain?
800*600 V=750*1024*8bit= 6144000bit; V= 750 KB V/(800*600*3)= 6144000bit/(800*600*3)bit =
4, 26666pp.
N=256 Answer: 5 pages.
9. I=3 bits Answer: 5 pages.
How many times and how will the amount of memory occupied by the image change if during its conversion the number of colors decreased from 65536 to 16?
V 1 /V 2 = I 1 /I 2 = 16/4 = 4 5. Practical work on a PC (7 min.)( )
Appendix 3
Practical work 1.2 “Editing images in the raster graphics editor Gimp.” Page 177 in school Ugrinovich “Informatics and ICT 9th grade”
6. Independent work of students(5 minutes.)( Appendix 4 )
7. Homework
1. Transferring a raster graphic image of 600*400 pixels in size using a modem at a speed of 28800 bps took 1 minute 20 seconds. Determine the number of colors in the palette used in this image.
2. The video memory page size is 62.5 KB. The graphic display operates in 640*400 pixel mode. How many colors are in the palette?
3. clause 1.1 – 1.4
8. Summing up the lesson. Reflection
The quality of a raster graphic image depends on the resolution of the monitor screen (the greater the number of raster lines and dots per line, the higher the image quality), as well as on the color depth (i.e., the number of bits used to encode the color of a dot).
Reflection (each student is given a card)
Last name, first name of the student: _________________ class__
- I understood everything, I can explain it, it was interesting
- I understand everything, I can explain
- I understand everything, but I won’t explain it
- I still have questions, but it was interesting
- I didn't understand anything, it wasn't interesting
Part A
When completing the tasks of this part, in answer form No. 1, under the number of the task you are performing (A1 - A20), put the sign “ "in the box whose number corresponds to the number of the answer you chose.
Assuming that each character is encoded by one byte, determine the information volume of the following statement Alexei Tolstoy:
The one who does nothing makes no mistakes, although this is his main mistake.
1) 512 bits 2) 608 bits 3) 8 kbytes 4) 123 bytes
The chessboard consists of 8 columns and 8 rows. What is the minimum number of bits required to encode the coordinates of one chessboard?
The message size is 11 kbytes. The message contains 11264 characters. What is the power of the alphabet?
The box contains 64 colored pencils. The message that a white pencil has been taken out carries 4 bits of information. How many white pencils were in the box?
To encode the background color of an Internet page, use the bgcolor="#ХХХХХХ" attribute, where hexadecimal values of the intensity of color components in the 24-bit RGB model are specified in quotes. What color will the color of the page specified by the tag be close to?
The main characteristics of computer audio encoding are...
3) Dimension, Sampling frequency 4) Audio bit depth, Bit depth
When encoding a picture for subsequent representation on a computer using raster graphics, the image:
is divided into a number of areas with the same brightness;
represented by a set of coordinates of points that have the same color;
converted into an array of coordinates of segments dividing the image into areas of the same color;
appears as a mosaic of square elements, each of which has its own color;
In what format does the file store information about a dynamic image?
- ^
How many different encodings of letters of the Russian alphabet are there?
1) one 2) two (MS-DOS, Windows)
3) three (MS-DOS, Windows, Macintosh) 4) five (MS-DOS, Windows, Macintosh, KOI-8, ISO)
How many times will the information volume of a page of text (the text does not contain formatting control characters) increase when it is converted from ASCII encoding (the encoding table contains 256 characters) to Unicode encoding?
To encode a 16-color image per video pixel, the following number of bits is required:
The RGB system is used to encode...information
1) text 2) numeric 3) graphic 4) audio
It is known that there are 256 balls in the box. Of these, 128 are black, 64 are white, and the rest are yellow. The amount of information in the message “Randomly got a yellow ball” is equal to:
5 bits b)1 bit c)2 bits d)4 bits
The computer's graphics system includes:
1) video memory and graphic display 2) graphic display and RAM
3) video adapter and graphics display 4) display processor and graphics display\
The screen can display 1024 colors. the number of different brightness levels for red is 8. The number of different brightness levels for green is 8. How many different brightness levels can the blue component have?
How will the information volume of a graphic file change if the original number of colors was 256, but as a result of transformations, 16 colors were set?
How many times will the information capacity of a file containing a raster image increase if its color depth is increased from the “black and white” standard to the “4,294,967,296 colors” standard?
After changing the desktop properties, the monitor acquired a resolution of 1024x768 pixels and was able to display 65,536 colors. How much video memory does the current desktop image take up?
When connected to the Internet, the modem provides a data transfer rate of 28,800 bps. How long will it take to transfer a 72,000 byte file?
The two messages contain the same number of characters. The amount of information in the first text is 2 times greater than in the second. The number of characters in each alphabet does not exceed 20, and there are a whole number of bits per character. Determine the greatest power of the first alphabet.
Part B
The answer to the tasks in this part (B1 - B10) is a set of symbols that should be written in answer form No. 1 to the right of the number of the corresponding task, starting from the first cell. Write each character in a separate box. Be sure to write the complete solution on your draft.
In some countries, a 5-character license plate is made up of capital letters (30 letters in total) and decimal digits in any order. Each character is encoded with the same and minimum possible number of bits, and each number is encoded with the same and minimum possible number of bytes. Determine the amount of memory required to store 50 license plates.
The document consists of text and graphic information. The text contains 30 lines of 30 characters each. The black and white image size is 120 x 300 pixels. Determine the information volume of this document, express the answer in bytes.
The table below shows part of the ASCII code table:
| Symbol | 1 | 5 | A | B | Q | a | b |
| Decimal code | 49 | 53 | 65 | 66 | 81 | 97 | 98 |
| Hex code | 31 | 35 | 41 | 42 | 51 | 61 | 62 |
What is the hexadecimal code for the character "q"?
The database stores records containing information about dates. Each record contains three fields: the year (a number from 1 to 2100), the month number (a number from 1 to 12), and the day number in the month (a number from 1 to 31). Each field is written separately from other fields using the smallest possible number of bits. Determine the minimum number of bits required to encode one record.
The color scanner has a resolution of 1024*512 dpi. The amount of memory occupied by a scanned image measuring 2*4 inches is about 8 MB. What is the scanner's color depth expressed in bits?
How much disk space in kilobytes would be needed to store 16-bit audio at a sampling rate of 24 kHz for 512 seconds?
The text is written in ASCII encoding. After 20 characters were removed from the text, its information volume became 1200 bits. Find the volume of the source text.
The book consists of three chapters. The first chapter contains 24 pages, the second chapter is three times longer than the third. The message that the book was randomly opened to a page from the third chapter contains 3 bits of information. Find the number of pages in the second chapter.
Calculate the size of a video file (in GB) with a duration of 60 s, a frame rate of 30 frames/sec, a resolution of 800*600 pixels and a color depth of 24 bits. The volume of the audio component of the video clip can be neglected.
To form the color, 32 shades of green, 16 shades of blue and 32 shades of red are used. How many colors can be displayed on the screen in this case?
Part C
At the zoo, 32 monkeys live in two enclosures, A and B. One of the monkeys is an albino (all white). The message “An albino monkey lives in enclosure A” contains 4 bits of information. How many monkeys live in enclosure B?
How many seconds will it take for a modem sending messages at 19200 bps to transmit a color bitmap image of 1280 by 800 pixels, assuming that the color of each pixel is encoded in 24 bits?
Chains of characters (strings) are created according to the following rule. The first line consists of one character, the number 1. Each of the following chains is created like this. First, the serial number of this line is written down, then the entire chain of numbers from the previous line is written down twice. The first 4 lines created using this rule look like this:
3211211
432112113211211
How many times in total does the number 1 appear in the 9th line?
The angry examiner never gives A's in computer science. Due to his maliciousness, he determined in advance the number of marks of each type and randomly assigned them to 24 applicants. The amount of information contained in the message “Applicant Ivanov received a B” is equal to 1+log 2 3 bits. The information volume of the message “Applicant Sidorov received a C” is equal to 3+ log 2 3- log 2 5 bits. Find the number of applicants who failed the exam.
Municipal budgetary educational institution
"Secondary school No. 20"
Test "Information Coding"
7th grade (FSES)
MBOU "Secondary School No. 20"
Pospelova Galina Vasilievna
Novomoskovsk
2018
Explanatory note.
This didactic material on the topicInformation Processing is recommended for 7th grade students. The material includes assignments to which students provide a written response.
Goals:
subject -developing an understanding of the basic concepts associated with coding graphic and text information on a computer;
meta-subject -basic skills and abilities to use coding tools to solve practical problems; mastery of the basics of self-control, self-esteem, decision-making and making informed choices in educational and cognitive activities;
personal- the ability to connect knowledge about the basic capabilities of a computer with one’s own life experience; interest in issues related to the practical use of computers.
Solvable educational tasks:
1) consideration of coding of graphic and text formations;
2) determination of the information volume of the image, message;
3) determination of text character codes using code tables.
Test on the topic " Coding of text and graphic information"
Exercise 1
In what order will the text fragments “excel”, “byte”, “8c”, “10d”, “9a”, “10a” appear if you arrange them in descending order?
A. "byte", "excel", "8b", "9a", "10g", "10a"
B. "byte", "excel", "8b", "9a", "10a", "10g"
C. "10a", "10g", "9a", "8b", "byte", "excel"
D. "byte", "excel", "9a", "8b", "10d", "10a"
E. "excel", "byte", "10g", "10a", "9a", "8b"
Task 2
What is the maximum number of characters that an encoding table can contain if, when stored, one character from this table occupies 10 bits of memory?
A. 800
B.80
C. 1024
D.512
E. 256
Task 3
Select the word that has the largest sum of character codes from the ASCII encoding table.
A. Window
B. Cinema
C. Nika
D. Horse
E. Night
Task 4
Select a text fragment "1999", "2001", "file", "file", "2b2d", which has the minimum sum of character codes in the ASCII table.
A. "2b2 d»
B. "file"
C. « file»
D. "1999"
E. "2001"
Task 5
The color blue on a computer with a 125 KB video memory page is coded 0011. What is the resolution of the graphic display?
A. 640×200
B. 320×400
C.640×400
D.640×800
E.512×400
Task 6
In the process of converting a raster graphic file, its volume decreased by 1.5 times. How many colors were there initially in the palette if, after conversion, a raster image of the same size was obtained in a 256-color palette?
A. 3072
B.384
C. 2048
D.12
E. 4096
Task 7
Some of the pages of the book are color images in a sixteen-color palette and in a format of 320 × 640 pixels; pages containing text are 64 lines with 48 characters per line. How many pages of a book can be stored on a 40 MB hard disk if the number of pages with color images is 80 more than the number of pages containing only text?
A. 400
B.720
C. 320
D. 100
E. 530
Information sources:
Bosova L.L. Informatics: textbook for 7th grade / L.L. Bosova, A.Yu. Bosova - Moscow: BINOM. Knowledge Laboratory, 2015 - 224 p.
Bosova L.L. Informatics: workbook for grade 7 / L.L. Bosova, A.Yu. Bosova - Moscow: BINOM. Knowledge Laboratory, 2015 - 160 p.
Rusakov S.V. Test tasks for the basic computer science course / S.V. Rusakov, L.V. Shestakova. - M.: Chistye Prudy, 2006. - 32 p.
Key
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| D | C | E | E | C | E | B |
Option 1
1. Information about the graphic image is generated in video memory:
1) Central processor,
2) GPU,
3) Graphics adapter,
4) Display processor.
2. Among the very first graphical information models are:
1) Rock paintings
2) Books with illustrations
3) Maps of the Earth's surface
3. Primitives in a graphic editor are called:
1) Graphic editor operating mode
2) Operations performed on files containing images
3) Drawings created in a graphics editor
4) The simplest figures that are drawn using special tools in a graphics editor
4. Graphics representing an image as a collection of points:
1) Fractal
2) Raster
3) Vector
4) linear
5. Splitting a sound wave into separate time sections:
1) Amplitude
2) Frequency
3) Discretization
4) quantization
6.
Audio encoding depth is the amount of ... that is necessary for ... discrete volume levels ... of sound.
1) Information, coding, digital
2) Data, conversion, digital
3) Information, coding, analog
4) Information, transformation, digital
7. The sound volume level is 65536. What is the encoding depth?
8. To obtain high-quality audio digitization, 20-bit signal encoding is used. Calculate how much space one minute of digital audio on any digital media recorded at 44.1 kHz will take up.
9. Calculate the size of a 20-second stereo audio file with 16-bit encoding and a sampling rate of 32 kHz. (present the answer in megabytes as a decimal fraction, no more than two decimal places)
10. What is the encoding depth if a stereo audio file with a playing time of 1 minute and a recording frequency of 32 kHz takes up approximately 3.66 MB of memory?
11. To store a bitmap of size 640 480 pixels without compression took up 300 KB of memory. What is the maximum possible number of colors in the image palette?
12. Graphic display operates in 640 mode400 pixels, having 4 colors. What should be the amount of video memory in kilobytes?
13. Fill the table:
14. Fill in the blanks in the sentences:
The quality of encoding depends on the number of signal level measurements per unit time, i.e.... .
The more measurements are taken per second (the higher the sampling frequency), the more accurate the procedure....
Final test on the topic
"Coding of graphic and sound information." 9th grade.
Option 2
1. A pixel on a color display screen represents:
1) A set of three phosphor grains
2) Phosphor grains
3) Electron beam
4) An imaginary point on the screen
2. Fill in the blanks in the sentence:
The contents of the video memory are continuously viewed... and displayed... on the screen.
1) Display processor, central processor
2) central processor, display processor
3) Display processor, display processor
4) central processor, graphics adapter
3. A video memory page is 16,000 bytes. The display operates in 320 mode400 pixels. How many colors are in the palette?
4. To store a 256-color image, the encoding of one pixel is allocated:
5. The amount of information required to encode discrete volume levels of digital audio is called:
1) Quantization
2) Discretization
3) Coding depth
4) fragmentation
6. Fill in the blanks in the sentence.
The basis of...sound using a computer is the process...of air vibrations into electrical current vibrations and the subsequent...analog electrical signal.
1) Coding, conversion, sampling
2) Transformations, encoding, sampling
3) Quantization, transformation, sampling
4) Coding, transformation, quantization
7. What is the sound volume level if the encoding depth is 16 bits?
8. To obtain high-quality audio digitization, 16-bit signal encoding is used. Calculate how much space one minute of digital audio on any digital media recorded at 11 kHz will take up.
1) 10 MB
3) 1.3 MB
9. Calculate the size of a 10 s stereo audio file with 16-bit encoding and a sampling rate of 32 kHz. (present the answer in megabytes as a decimal fraction, no more than two decimal places)
10. What is the encoding depth if a mono audio file with a playback duration of 1 minute and a recording frequency of 32 kHz occupies 3.66 MB?
11. To store a raster image measuring 64x64 pixels, 1.5 kilobytes of memory were allocated. What is the maximum possible number of colors in the palette?
12. Specify the minimum amount of memory (in kilobytes) required to store any 256-by-256-pixel bitmap image that is known to have a 216-color palette.
13. Fill the table:
14. Fill in the blanks in the sentences.
In order for a computer to process sound, the continuous audio signal must be converted into... discrete form using time sampling.
A continuous sound wave is divided into separate small temporary sections, for each such section a certain amount of ... sound is set. This process is called... sound.
