07 Digital Media A edit 24f (2)

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22 Terms

1

Microphone

A transducer that converts sound waves to an electric signal.

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2

Speakers

Devices that convert electric voltage/current to sound waves.

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3

Sine Wave

A mathematical function used to represent sound waves, related to amplitude, frequency and phase.

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4

Amplitude (a)

Related to the intensity of sound, measured in decibels (dB).

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5

Frequency (f)

Related to perceived pitch, measured in Hertz (Hz).

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6

Phase (θ)

Depends on the relative location of the sound; affects the waveform.

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7

Sampling Rate

The frequency at which samples are taken from a continuous signal to create a digital representation.

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8

Bit Depth

The number of bits used to represent each audio sample, affecting sound quality.

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9

Nyquist-Shannon Theorem

States that the sampling rate must be at least twice the highest frequency to be sampled accurately.

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10

Quantization Noise

The difference between the actual analog signal and its quantized digital representation.

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11

Lossless Compression

A compression method that allows the original data to be perfectly reconstructed from the compressed data.

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12

Lossy Compression

A compression method that reduces data size by removing some information, potentially affecting quality.

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13

Codec

A program or device that compresses and decompresses digital media, combining coder and decoder.

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14

RGB Color Model

A color model using red, green, and blue components to create other colors.

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15

Vector Graphics

Images defined mathematically using lines, curves, and polygons, scalable without loss of quality.

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16

Raster Graphics

An image composed of a matrix of pixels, showing details but can pixelate when enlarged.

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17

JPEG (Joint Photographic Experts Group)

A widely used lossy compression format for digital images, suitable for photographs.

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18

MPEG (Moving Picture Experts Group)

A standard for compressing video and audio data, used in streaming and playback.

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19

File Container

A format that combines audio and video streams into one file, allowing varied data types.

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20

High Dynamic Range (HDR)

Techniques that allow for greater variation between the darkest and brightest parts of an image.

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21

FLAC (Free Lossless Audio Codec)

A lossless audio compression format used for high-quality audio archival.

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22

MP3 (Moving Pictures Experts Group Audio Layer III)

A common lossy compression format that sacrifices some audio quality for reduced file size.

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