Theme: Expression of signals by time and degree Plan: The Digital Signal Processing


Digital Signal Processors (DSPs) are microprocessors with the following characteristics



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Digital Signal Processors (DSPs) are microprocessors with the following characteristics:

a) Real-time digital signal processing capabilities. DSPs typically have to process data in real time, i.e., the correctness of the operation depends heavily on the time when the data processing is completed.

b) High throughput. DSPs can sustain processing of high-speed streaming data, such as audio and multimedia data processing.

c) Deterministic operation. The execution time of DSP programs can be foreseen accurately, thus guaranteeing a repeatable, desired performance.

d) Re-programmability by software. Different system behaviour might be obtained by re-coding the algorithm executed by the DSP instead of by hardware modifications.

DSPs appeared on the market in the early 1980s. Over the last 15 years they have been the key enabling technology for many electronics products in fields such as communication systems, multimedia, automotive, instrumentation and military. Table 1 gives an overview of some of these fields and of the corresponding typical DSP applications. Figure 1 shows a real-life DSP application, namely the use of a Texas Instruments (TI) DSP in a MP3 voice recorder–player. The DSP implements the audio and encode functions. Additional tasks carried out are file management, user interface control, and post-processing algorithms such as equalization and bass management.





Figure 1. Use of Texas Instruments DSP in a MP3 player/recording system



Figure 2 . Typical controls infrastructure used at CERN and DSP characterisctics location


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