Flashcard on Sound and Digital Conversion

Front

What does a microphone do according to the document?

Back

Measures changes in air pressure

Answer explanation

A microphone measures changes in air pressure, converting sound waves into electrical signals. This is the fundamental function of a microphone, distinguishing it from other options that do not accurately describe its role.

Front

What is the role of a sound card?

Back

To translate between analogue and digital information

Answer explanation

The primary role of a sound card is to translate between analogue and digital information, allowing computers to process and output sound. This conversion is essential for audio playback and recording.

Front

What is sampling in the context of sound?

Back

Recording sound at set time intervals

Answer explanation

Sampling in sound refers to recording sound at set time intervals, capturing the audio waveform to create a digital representation. This process is essential for converting analog sound into a format that can be processed by computers.

Front

What is the sample frequency of most music CDs?

Back

44,100 hertz

Answer explanation

The sample frequency of most music CDs is 44,100 hertz. This standard was established to provide high-quality audio reproduction, capturing the full range of human hearing.

Front

What does the digital to analogue converter (DAC) do?

Back

Changes digital information into sound

Answer explanation

A digital to analogue converter (DAC) changes digital information into sound, allowing digital audio signals to be played through speakers. This is essential for listening to music or audio from digital devices.

Front

What does the microphone translate air pressure into?

Back

Electrical voltage

Answer explanation

The microphone converts variations in air pressure (sound waves) into electrical voltage. This electrical signal can then be processed or converted into digital signals, but the immediate output is electrical voltage.

Front

What does the computer do with the digitized sound? Options: Converts it back to analogue, Displays it for manipulation, Stores it as electrical voltage, Measures its frequency

Back

Displays it for manipulation

Answer explanation

The computer processes digitized sound by displaying it for manipulation, allowing users to edit or adjust the audio. This is essential for tasks like mixing or applying effects, making it the correct choice.

Front

What does bit depth refer to in audio processing?

Back

The number of bits of information in each sample

Answer explanation

Bit depth in audio processing refers to the number of bits of information in each sample. It determines the audio quality and dynamic range, with higher bit depths allowing for more detailed sound representation.

Front

What is the function of a digital-to-analogue converter (DAC)?

Back

Converts digital signals to analogue signals

Answer explanation

A digital-to-analogue converter (DAC) is designed to convert digital signals into analogue signals, enabling devices to produce sound or other analogue outputs from digital data.

Front

Where is an analogue-to-digital converter (ADC) typically found?

Back

In a computer's sound card

Answer explanation

An analogue-to-digital converter (ADC) is commonly found in a computer's sound card, where it converts audio signals into digital data for processing. This is essential for sound playback and recording.