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Peer-reviewed paper · 2020

Digital Signal Processing Flexed-Point Representation

Embedded DSP forces a choice between fast but limited fixed-point arithmetic and accurate but expensive floating-point. The paper introduces flexed-point (flxp): a representation that trades off between the two — a fixed-point mantissa scaled by a small exponent — suited to the low-power, small CPUs found in embedded applications.

B.-Ș. Gheorghe, C.-B. Vișan. Digital Signal Processing Flexed-Point Representation. Procedia Manufacturing, vol. 46, pp. 675–682, Elsevier, 2020. Open access (CC BY-NC-ND 4.0).

Read the paper doi:10.1016/j.promfg.2020.03.096
flxp word layout (schematic)
mantissaM bits · fixed-point Q-format
exponentE bits

value = mantissa × 2exponent

fixed-point
fast · limited rangeflxpfloating-point
accurate · costly

Patent submissions

  • Direct mode prediction in video encodingVideo coding · Philips / NXP era
  • Advanced error concealment in video codingVideo coding · Philips / NXP era
  • Adaptive error detectionVideo coding · Philips / NXP era
  • Intra refresh by texture agingVideo coding · Philips / NXP era
  • Parallel decoding of a scalable video bit-streamScalable video coding

Talks & industry presence

  • “H.264 Decoding on Mobile Platforms”4th Philips DSP Conference, 15–16 November 2005
  • H.264 technology previewIBC 2002 and IBC 2004, with an AVC promotion CD
  • Instruction-set research for H.264New TriMedia instructions proposed for H.264, included in the PNX1700
  • BDTI benchmarks for the CoolFlux DSPImplementation and optimization of the industry-standard DSP benchmarks

Training delivered

  • H.264 and video coding techniquesFor departments within Philips and NXP, and their customers
  • CoolFlux DSPFor NXP departments and customers
  • Delivered solutions & general topicsFor customers and their partners: our components, plus audio, video and embedded software topics

Research projects & quality

  • ARTEMOS — EU-funded researchAgile RF transceiver capabilities for future radio communication
  • Internal R&DOngoing projects around audio and video processing
  • CMMI Level 2 auditQuality project-management audit (CMMI Level 2) while inside NXP

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