Digital Signal Processing

Audio, video, and many other natural or human-made signals can be represented as a set of binary or “digital” numbers (e.g., 00001001 11110011). For audio signals, these numbers represent an [Page 599]approximation to the amplitude of a sound wave at discrete moments in time. Digital audio signals can faithfully represent their analog counterparts (e.g., voltages, pressures) when the process of analog-to-digital conversion includes a sufficiently high sampling rate and a sufficient number of binary digits or “bits.” Moreover, digital audio signals are easily interfaced with computers and portable electronic devices, making it possible to efficiently process, save, modify, and reproduce audio signals. This entry discusses basic principles of digital signal processing and describes several applications of digital signal processing to speech and hearing science.

Digital signal ...