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

HVAC Control in the New Millenniumdata stream of digital data. Transmitting data in a mobile environmentwill corrupt the transmitted signal due to multipath and Doppler frequencyshifts. An equalizer uses the Viterbi algorithm to reverse theseeffects and resynchronize the bit stream.Next-generation DSPs are enabling the next generation of PDAs byproviding the horsepower required to implement multiple tasks on asingle device. Quality voice storage and playback are part of the PDA ofthe future. The DSP can compress, store, and reconstruct speech. If theDSP is performing speech coding, speech samples are transferred betweenthe DSP and the voice-band codec.Since the system must be reconfigurable, it must be programmableand capable of handling multiple tasks simultaneously and shifting tonew tasks as needed. This means the DSP must offer flexiblemultitasking support for the simultaneous operation of functions.The PDA of the future uses a group of DSP algorithms that aredynamically executed. The development of these algorithms usuallybegins with a high-level-language (HLL) model. A compiler allows theporting of the model to assembly language with some hand-codingsupport to optimize the final program.Next-generation DSP architectures are based on superscalar machinesto provide the required throughput needed. Superscalar DSPs usemultiple execution units coupled with high data bandwidth to executemany instructions per cycle.Superscalar DSPs are scaleable since the architecture can be tailoredto an application by changing the number or type of executionunits to fit particular needs. Superscalar devices will continue to evolveto address the continuing demands of wireless applications.Data ExchangePersonal digital assistants (PDAs) along with pagers and smartcellular telephones can share Windows data. There have been a numberof advances in this exploding world of miniature, mobile electronics.Apple’s Newton MessagePad and the Sharp Expert Pad are notwed to any one operating system. The Windows version of the NewtonConnection Kit lets you transfer data between this infrared-equippedPDA and Windows systems. Some PCMCIA-based Newton applicationsare also available in Windows versions so you can run the same softwareon both machines.©2001 by The Fairmont Press, Inc. All rights reserved.