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Most general-purpose microprocessors and operating systems can execute DSP algorithms successfully, but are not suitable for use in portable devices such as mobile phones and PDAs because of power efficiency constraints.<ref name="schaum-2004"/> A specialized DSP, however, will tend to provide a lower-cost solution, with better performance, lower latency, and no requirements for specialised cooling or large batteries.{{citation needed|date=February 2013}}
Such performance improvements have led to the introduction of digital signal processing in commercial [[communications satellite]]s where hundreds or even thousands of analog filters, switches, frequency converters and so on are required to receive and process the [[uplink]]ed signals and ready them for [[downlink]]ing, and can be replaced with specialised DSPs with significant benefits to the satellites' weight, power consumption, complexity/cost of construction, reliability and flexibility of operation. For example, the SES-12 and SES-14 satellites from operator [[SES
The architecture of a DSP is optimized specifically for digital signal processing. Most also support some of the features of an applications processor or microcontroller, since signal processing is rarely the only task of a system. Some useful features for optimizing DSP algorithms are outlined below.
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