HVAC Control in the New Millennium.pdf - HVAC.Amickracing

HVAC Control in the New Millenniummaturing, has standards in place, and is moving toward the next evolutionin products.Pocket CommunicationsWireless systems devices are evolving as hand-held, multifunctional,portable communicators combine the capabilities of digital cellularphones with personal digital assistants (PDAs). The latest designsintegrate features from multiple communications products includingdigital cell phones, pagers, data/fax modems, voice messaging andhigh-end PDAs into a single hand-held unit. Each of these functions istypically handled by separate signal-processing integrated circuits (ICs)called digital-signal-processors (DSPs).Integrating these functions into a single DSP requires signal-processingperformance beyond the capabilities of traditional DSPs whichuse DSP assembly code and required highly skilled, specialized programmers.This time-consuming and expensive method results in codethat is difficult to maintain.New more-efficient DSP architectures have appeared which usetechniques and architectures from high-performance microprocessors.Some examples are superscalar/reduced-instruction-set-computer(RISC) and very-long-instruction-word (VLIW) architectures. Both ofthese can provide 10 times the performance of traditional DSPs. TheseDSPs have the following characteristics:• wired functions data/fax modem,• wireless functions cellular phone, paging, and voice messaging,• telephony functions telephone-answering with digital recordingand playback.The development of wireless solutions combines integrated-circuittechnology advancements with system-level analysis of the desired application.Innovative IC designs following a continually improving processtechnology allow wireless manufacturers to provide cost-effectiveproducts. Advancements in ICs for wireless applications include:• faster digital-signal-processors (DSPs) with more million instructionsper second (MIPS),• programmability,©2001 by The Fairmont Press, Inc. All rights reserved.