The current availability of analogue surface acoustic wave (SAW) and charge coupled devices (CCD) permits the hardware realisation of real time Fourier transform processors as an alternative to use of the digital fast Fourier transform (FFT). This thesis demonstrates how such analogue Fourier transform processors have been designed, developed and applied to engineering systems since the initial work in the years 1974-1975. A rigorous mathematical analysis of the operation of the SAW (chirp) Fourier transform is presented. This demonstrates that recovery of transform components at baseband demands high tolerance components and circuit design. However, by holding the outputs on a carrier, considerable hardware simplification is possible. Specific applications in spectrum analysis, cepstrum analysis and signal correlation are considered since these permit operation with the transform components on a carrier. In addition, the design and application of CCD Fourier transform processors, based on the chirp-z-transform and prime transform algorithms is presented. The performance of these analogue processors is compared to that of the digital FFT. This work leads directly to consideration of the design and application of Fourier transform processors which incorporate combinations of SAW and CCD devices. Experimental results are included throughout to demonstrate the operation of the systems discussed in the thesis.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:652874 |
| Date | January 1978 |
| Creators | Jack, Mervyn A. |
| Publisher | University of Edinburgh |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/1842/15087 |
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