IB Digital Society Topic 1.1C Analogue-to-digital Transformation and Digitalization Revision Notes (SL/HL)

IB Digital Society Topic 1.1C Analogue-to-digital Transformation and Digitalization Revision Notes (SL/HL) | RevisionDojo

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1.1C Analogue-to-Digital Transformation and Digitalization

Digitization: Turning Analog into Numbers

Digitization = converting analog information into digital form computers can store and process (scanned photo, recorded voice saved as an audio file, paper form typed into a database).
Why: bits can be copied perfectly, searched, compressed, sent over networks, stored cheaply; an analog original sits in one place and slowly decays.
Digitization is a measurement. The device samples a continuous signal at intervals, so the digital version is a close approximation, and how the measuring is done sets its fidelity.

From Signal to Bits: Sample, Quantize, Encode

Three steps turn a continuous signal into bits (a sound wave into a mic as the example):
1. Sample: measure the wave's height at regular moments; each measurement is one sample.
2. Quantize: round each sample to the nearest value from a fixed set of allowed levels.
3. Encode: write each rounded value in binary; the whole wave becomes a long string of bits.
Rounding in the quantize step is where detail is lost: the true height rarely lands on an allowed level, so it is nudged to the closest. That gap = quantization error, the price of going digital.

Analogy

Analogy

Sampling is like photographing a moving hand many times a second.
Each photo is one sample, and playing them back fast brings the movement back.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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1.1C Analogue-to-Digital Transformation and Digitalization

Digitization: Turning Analog into Numbers

Digitization = converting analog information into digital form computers can store and process (scanned photo, recorded voice saved as an audio file, paper form typed into a database).
Why: bits can be copied perfectly, searched, compressed, sent over networks, stored cheaply; an analog original sits in one place and slowly decays.
Digitization is a measurement. The device samples a continuous signal at intervals, so the digital version is a close approximation, and how the measuring is done sets its fidelity.

From Signal to Bits: Sample, Quantize, Encode

Three steps turn a continuous signal into bits (a sound wave into a mic as the example):
1. Sample: measure the wave's height at regular moments; each measurement is one sample.
2. Quantize: round each sample to the nearest value from a fixed set of allowed levels.
3. Encode: write each rounded value in binary; the whole wave becomes a long string of bits.
Rounding in the quantize step is where detail is lost: the true height rarely lands on an allowed level, so it is nudged to the closest. That gap = quantization error, the price of going digital.

Analogy

Analogy

Sampling is like photographing a moving hand many times a second.
Each photo is one sample, and playing them back fast brings the movement back.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Topic 1 - Introduction - Digital Society1 subtopic

Topic 2 - Concepts - Digital Society7 subtopics

Topic 3 - Content - Digital Society7 subtopics

Topic 4 - Contexts - Digital Society7 subtopics

Topic 5 - Challenges and Interventions - Digital Society (HL)3 subtopics

IB Digital Society 1.1C Analogue-to-digital Transformation and Digitalization Notes

Topic 1 - Introduction - Digital Society1 subtopic

Topic 2 - Concepts - Digital Society7 subtopics

Topic 3 - Content - Digital Society7 subtopics

Topic 4 - Contexts - Digital Society7 subtopics

Topic 5 - Challenges and Interventions - Digital Society (HL)3 subtopics

1.1C Analogue-to-Digital Transformation and Digitalization

Digitization: Turning Analog into Numbers

From Signal to Bits: Sample, Quantize, Encode

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

1.1C Analogue-to-Digital Transformation and Digitalization

Digitization: Turning Analog into Numbers

From Signal to Bits: Sample, Quantize, Encode

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account