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Computer Architecture and Processing Systems

Smartphones: input, output and processing

  • 3 things to know
  • AS Unit 2

Overview

Four sensors commonly built into a smartphone, components a smartphone uses to capture and to reproduce sound and haptic feedback.

What you need to know

Answer each one before you reveal it.

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Key term

Why does a capacitive touchscreen not respond to a gloved finger?

Key term

Name four sensors commonly built into a smartphone.

Key term

What does an accelerometer allow a phone to do?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    How does a capacitive touchscreen detect a finger?

    Model answer

    A capacitive touchscreen holds a small electrical charge across its surface and senses the change a fingertip causes at the point of contact.

  2. 2

    Why does a capacitive touchscreen not respond to a gloved finger?

    Model answer

    A capacitive screen depends on the conductivity of skin, and an ordinary glove insulates the finger from the surface.

  3. 3

    Name four sensors commonly built into a smartphone.

    Model answer

    A smartphone commonly contains an accelerometer, a gyroscope, a satellite positioning receiver and an ambient light sensor.

  4. 4

    What does an accelerometer allow a phone to do?

    Model answer

    An accelerometer detects the direction of gravity and any movement, so the phone can turn the display round when it is tipped on its side.

  5. 5

    How does a smartphone work out where it is?

    Model answer

    A smartphone times the signals arriving from several positioning satellites and calculates its position from the differences between them, using nearby masts and wireless networks to narrow the search first.

  6. 6

    Name the components a smartphone uses to capture and to reproduce sound.

    Model answer

    A smartphone captures sound through a built-in microphone and reproduces it through a loudspeaker or a wired or wireless headset.

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