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Sound Design Assignment 2: The Analog to Digital Conversion Process

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Stephen Druker

on 18 March 2013

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Transcript of Sound Design Assignment 2: The Analog to Digital Conversion Process

Word Length / Bit-Depth Sampling Rate Dynamic Range Resolution Amplitude (db) How much information is in a measurement The Sampling Process Analog is one continuous signal, digital information is discreet.
When converting from analog-to-digital, we're making many, many measurements per second.
We can vary both how 'detailed' a measurement we take and how often we take it
"Detail" Each one of those measurements has a specific size (bit depth / word length)
How often we do the measurements is known as the sampling rate. The Analog to Digital Conversion Process Binary Information How often a 'measurement' is taken Bits per sample Measurements per second (hertz) Frequency (hz) Nyquist frequency (1/2 the sampling frequency) 24 bit (recording) vs 16 bit (CD) 44,100 Hz vs 48,000 Hz WHAT IS IT? HOW IS IT MEASURED? FOR EXAMPLE: WHAT ASPECT OF RECORDED SOUND DOES IT IMPACT? FOR EXAMPLE: Based on the 'bit'
representing information as a 1 or a 0 (on or off, there or not there)
Want more than that, you need more bits!
More information involves collecting bits into words
Words increases the amount of information you can hold in a 'package'
Some analogies that may help
Language: a letter vs. a word
h vs horse
Mathematics: increasing digits in a number
7 vs 17 vs 127
How many different values can be represented in a word?
2 to the power of the word length
E.g., a 3 bit word can represent 8 different values (2 X 2 X 2) Word Length / Bit-Depth Dynamic Range / Resolution Amplitude (db) How much information is in a measurement Bits per sample 24 bit (recording) vs 16 bit (CD) WHAT IS IT? HOW IS IT MEASURED? FOR EXAMPLE: FOR EXAMPLE: WHAT ASPECT OF RECORDED SOUND DOES IT IMPACT? Sampling Rate How often a 'measurement' is taken Measurements per second (hertz) Frequency (hz) Nyquist frequency (1/2 the sampling frequency) 44,100 Hz vs 48,000 Hz WHAT IS IT? HOW IS IT MEASURED? FOR EXAMPLE: WHAT ASPECT OF RECORDED SOUND DOES IT IMPACT? FOR EXAMPLE: The Sampling Process WHAT IS IT? HOW IS IT MEASURED? WHAT ASPECT OF RECORDED SOUND DOES IT IMPACT? Word Length / Bit-Depth Sampling Rate Overview The Analog to Digital Conversion Process
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