Pros and Cons of Digital Media

Pros and Cons of Digital Data

By David McLean

Open Ended

It is the year 1900. You wrote a book. How can people find and buy your book?

Open Ended

It is the year 2022. You wrote a book. How can people find and buy your book?

Open Ended

It is the year 1800. You mailed a letter to your brother. He lives in Canada. How long does it take for the mail to be delivered?

Open Ended

It is the year 2022. You sent an email to your brother. He lives in Canada. How long does it take for the email to be delivered?

Pros of digital media

Difficult to copy​

How will you copy this?

​​Easy to copy

​​Analog

Digital

Ctrl-c, ctrl-v. Finished!

Be careful!

• Drop it, and it's damaged.

• ​Time will damage it naturally.

Digital data won't go bad​

​

​​Analog

Digital

• You can keep it forever.

Snail Mail

• Very slow

• ​Sometimes gets lost

• Uses paper resources

• Expensive

e-mail​

​

​​Analog

Digital

• Really fast

• Usually free

• Can send pictures, videos, etc. to anywhere in the world

Because digital data are stored as 0 and 1 (off and on), even with some signal noise, the computer can process the data with no problem.

​

1 = on = some voltage 電圧があります

0 = off = no voltage 電圧なし

​

They are very different to a computer, so there’s no confusion.

​

Noise

1. We can change the color of digital photo easily.

2. We can duplicate an digital image with a few mouse clicks.

3. We change the shape of a digital object with software like photoshop.

4. We can add CG effects to a video. TikTok, Instagram, etc.

Easy to change

Fill in the Blank

1 = ????

on / off

1. We can store various kinds of info in digital format in one device.

   1. multimedia = video, images, audio, documents, books, magazines, etc.

   2. For analog data, we need different kinds of storage media. 

2. Digital multimedia can be interactive.

​

Digital is awesome

Multiple Choice

Images, videos, audio, books, etc.

• interactive

  インテラクティブ

• multimedia

  マルチメディア

• decimal

  10進数

• compression

  データ圧縮

Multiple Choice

A microphone converts _____ to electrical signals.

マイクは_____を電気信号に変換します。

• air

  空気

• vibrations

  振動

• heat

  熱

• chickens

  鶏

Data compression software can reduce storage space of digital data.

​

Data compression

Reversible compression = non-destructive

​​Lossless

Irreversible compression = destructive

​​Lossy

​可逆圧縮

​非可逆圧縮

​オリジナル

​可逆圧縮

​非可逆圧縮

Multiple Choice

Lossless

可逆圧縮

Multiple Choice

Lossy compression gives us _____ file sizes.

非可逆圧縮では、ファイルサイズが_____なります。

• smaller

• larger

We can encode media to save space. Size good for up/downloading.

1. ​

   1. Irreversible compression = destructive

   2. Loss of quality. Sometimes detectable, sometimes not.

   3. Music: .wav 50MB -> .mp3 4MB

Multiple Choice

How many .mp3 songs can fit on a 256GB iPhone X?

256GBのiPhoneXに保存できる.mp3曲の数はいくつですか？

Hint: one .mp3 is about 3MB.

Hint: 1GB = 1024MB

• 156, 439

• 12,000

• 87,381

• 7

Open Ended

Digital data is great, right?

But can you think of any demerits?

デジタルデータは素晴らしいですよね？

しかし、あなたは何かデメリットを考えることができますか？

Cons of digital data

Digital isn't perfect!​

1. Loss of data when sampling for digital conversion

2. Data thief. Someone can steal your identity or private information.

3. Data leak: Once you upload a photo, it can spread like wild fire.

4. Data keep growing. We need lot of storage as technology advances. We also need faster networks to handle larger data amounts.

5. Some sounds are lost音データをディジタル化 →非可聴域にある周波数の音は除外 →人間はこのような音からも影響を受ける

6. Too easy to copy data.​

Can you think of anything else?

Multiple Choice

To convert a hand-written document to digital data, we should use _____.

手書きの文書をデジタルデータに変換するには、_____を使用する必要があります。

• an image scanner

• CPR

• a microphone

• a smart card

​​Image Scanner

​​Smart Card

​​Microphone

​c

​​CPR

Multiple Choice

• Software

• SSD

• RAM (Memory)

• Hard Disk

Multiple Choice

What is "6" in binary?

• 10

• 110

• 1

• 111

Multiple Choice

What's "F" in decimal?

• 15

• 10

• 17

• 12

Please read pages 18-19

Then, do pages 12 & 13 in the 学習ノート.

​

When you are finished, please continue working on the "Original Report" in Google Classroom.​