Papers Published

1. Pollard, A.E. and Wolf, P.D. and Bartram, F.R. and Ideker, R.E. and Smith, W.M., A high-speed memory for the acquisition and analysis of data from cardiac mapping studies, Computers in Cardiology (Cat. No. 84CH2078-4) (1984), pp. 413 - 16 .
   (last updated on 2007/04/14)

   Abstract:
   The acquisition and analysis of data from cardiac mapping studies require long term offline recording as well as short term storage in a buffer device accessible to the host computer. A fast bulk memory has been implemented to buffer digitized electrophysiological waveforms between a microcomputer-based data acquisition system and host computer. An Intel Series 91 ECX bulk memory system is accessed through a controller by either the multichannel mapping system or a direct memory access (DMA) interface on the host. The system hardware provides address sequencing with variable increment amounts, allowing efficient access to multiplexed data. The calculations and loading of a complete 32-bit address can be accomplished in less than 200 ns, overlapping the memory access from a previous cycle. Thus, data can be transferred at 10 megabytes per second, with system throughput limited by the DMA bandwidth. A boundary detection facility allows the memory to be used in circular or one-fill mode. The memory has proved to be an effective buffer device in the acquisition and analysis of cardiac electrograms

   Keywords:
   computerised signal processing;data acquisition;electrocardiography;medical computing;random-access storage;