digital signal processing

digital signal

stream of numbers called digital code

analog signal

continuous signal created from a sound

how are analog signals converted to digital code

an analog to digital converter (ADC)

sampling rate

number of times/ seconds the magnitude of the signal is measured

nyquist frequency

highest frequency in the spectrum of a signal

what must the sampling rate be to represent the original signal

at least twice the nyquist frequency

digital precision

can be calculated using formula d= 2 to the power of n

what is ‘d’ in digital precision formula

the number of digitized values

what is ‘n’ in digital precision formula

the number of bits

3 bits equal

011

4 bits equal

1011

aliasing error

distortion of a digital signal caused by a sampling rate that is too low

quantization error

difference between actual amplitude of the analog signal and amplitude represented by the digital signal

what can a quantization error be heard as

noise