ABSTRACT
This chapter introduces techniques related to processing audio signals with operations using scalar numbers. Digital signal processing (DSP) is a set of techniques that can be used to change the information in a signal. DSP involves any method of processing or analyzing a signal to create a new signal or to recover information about the original signal. The amplitude of a signal can be changed by multiplying each element by a scalar value. One method to visualize a change in signal amplitude is to view the waveform. A comparison can be made between the original, unprocessed signal and the new, processed signal. In this method, the amplitude is plotted over time. Therefore, the gain change is easier to view for signals with a relatively consistent amplitude. Another method to visualize the processing of an element-wise system is to plot the amplitude of the input signal versus the amplitude of the output signal.
