数字信号处理的简介外文翻译（可编辑）.doc

数字信号处理的简介外文翻译 Introduction to Digital Signal Processing 1. What is Digital Signal Processing? Digital Signal Processing, or DSP, as the term suggests, is the processing of signals by digital means. A signal in this context can represent a number of different things. Historically the origins of signal processing are in electrical engineering, and a signal here means an electrical signal carried by a wire or telephone line, or perhaps by a radio wave. More generally, however, a signal is a stream of information representing anything from stock prices to data from a remote-sensing satellite. The term digital comes from digit, meaning a number you count with your fingers - your digits, so digital literally means numerical; the French word for digital is numerique. A digital signal consists of a stream of numbers, usually but not necessarily in binary form. The processing of a digital signal is done by performing numerical calculations. Digital Signal Processing is one of the most powerful technologies that will shape science and engineering in the twenty-first century. Revolutionary changes have already been made in a broad range of fields: communications, medical imaging, radar sonar, high fidelity music reproduction, and oil prospecting, to name just a few. Each of these areas has developed a deep DSP technology, with its own algorithms, mathematics, and specialized techniques. This combination of breath and depth makes it impossible for any individual to master all of the DSP technology that has been developed. DSP education involves two tasks: learning general concepts that apply to the field as a whole, and learning specialized techniques for your particulararea of interest 2. Analog and digital signals In many cases, the signal of interest is initially in the form of an analog electrical voltage or current, produced for example by a microphone or some other type of transducer. In some situations, such as the output from