What's an example of a analogue to digital converter in use?
Microphones
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What's an example of a Digital to Analogue converter in use?
Speakers
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What are the stages of analogue to digital conversion?
1. Sound samples is recorded through a Amplifier 2. An ADC converts wave height into a integer value 3.This digital value is stored as a binary value. (Reverse to output sound)
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What is sampling?
This is when an analogue signal is measured at regular intervals
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What is the Sampling Rate? What is it measured in?
The number of samples taken in one second//measured in Hertz
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Explain the audio bit depth. What is the Term audio bit depth recognised as?
The audio bit depth is the number of bits used to record each measurement // known as the resolution
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What is the advantage and disadvantage of a higher bit depth?
The higher the bit depth, the more accurately the height of a wave can be recorded, however the file size increases significantly
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What is the frequency?
This is the sampling rate per second, similar to bit depth the greater the frequency, the greater the file size but the better the accuracy of capturing waves.
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How would you calculate the file size of an audio file? what is this measured in?
Sample Rate x Resolution x length (seconds) // the output will be in bits, /8 for bytes then /1M for MB
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What changes when calculation the file size for a stereo file?
The file size doubles as both channels are used to output sound
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What is the basic principle of Nyquist Theorem?
Samples must be twice the highest frequency in order to replicate the original sound wave (Fs>2Fmax)
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Why must music/sound producers follow Nyquist theorem?
The frequency rate must be doubled in order to capture all the peaks and troughs of the audio waves effectively.
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What is the maximum frequency humans can hear? // therefore, at what frequency are CD's sampled at?
Humans can hear frequency's from 20Hz to 22kHz // CD's follow Nyquist theorem and sample at 44kHz
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What does MIDI stand for?
Musical Instrument Digital Interface
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What does a MIDI Do?
It re-creates the elements of a musical instrument it works from software, it's not a live recording it's SYNTHESISED
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What are the benefits of MIDI?
This system only requires the program to store the instruction to play the sound, rather than the actual sound. this reduces the amount of data transferred. // MIDI files are editable and individual instruments can be modified
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What is the disadvantage of MIDI?
Because the sound is synthesised it may seem less realistic
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What are "Event Messages"?
These can be described as a sound processor that links together instrumentals
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What do these Event Messages do?
It is used to send a timed sequence of events such as Synchronise tempo, control pitch, change volume, introduce science
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What is an example for the use of a MIDI device?
a MIDI digital keyboard
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Other cards in this set
Card 2
Front
Speakers
Back
What's an example of a Digital to Analogue converter in use?
Card 3
Front
1. Sound samples is recorded through a Amplifier 2. An ADC converts wave height into a integer value 3.This digital value is stored as a binary value. (Reverse to output sound)
Back
Card 4
Front
This is when an analogue signal is measured at regular intervals
Back
Card 5
Front
The number of samples taken in one second//measured in Hertz
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