IEEE Transactions on Instrumentation and Measurement · 1993 · 24 citations · 5 references
EngineeringComputer EngineeringComputer ScienceInstrumentationMetrologyReal-time SystemsDigital InstrumentationDigital Signal ProcessingFrequency MetrologyTime MetrologyDirect Memory Access (Dma)Direct Memory Access ArchitectureDma Controller ArchitectureFrequency MeasurementNatural Frequency MeasurementPulse CountingTimer ArchitectureTimer Design
A frequency measurement method based on both pulse counting and time measurement during a constant sampling time is presented. The content of a free-running timer is transferred by a direct memory access (DMA) to a memory location after each rising edge of an input pulse, so the DMA transfer counter serves as a pulse counter. Several sources of measurement errors are discussed in detail. The DMA method is suitable for real-time speed control system with an integrated DMA controller.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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