digital signal processing

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14 Terms

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digital signal
stream of numbers called digital code
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analog signal
continuous signal created from a sound
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how are analog signals converted to digital code
an analog to digital converter (ADC)
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sampling rate
number of times/ seconds the magnitude of the signal is measured
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nyquist frequency
highest frequency in the spectrum of a signal
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what must the sampling rate be to represent the original signal
at least twice the nyquist frequency
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digital precision
can be calculated using formula d= 2 to the power of n
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what is ‘d’ in digital precision formula
the number of digitized values
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what is ‘n’ in digital precision formula
the number of bits
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3 bits equal
011
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4 bits equal
1011
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aliasing error
distortion of a digital signal caused by a sampling rate that is too low
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quantization error
difference between actual amplitude of the analog signal and amplitude represented by the digital signal
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what can a quantization error be heard as
noise