# Items where Author is "Ell, Todd A"

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## Article

Le Bihan, Nicolas and Sangwine, Stephen J and Ell, Todd A (2014) 'Instantaneous frequency and amplitude of orthocomplex modulated signals based on quaternion Fourier transform.' Signal Processing, 94 (1). pp. 308-318. ISSN 0165-1684

Sangwine, Stephen J and Ell, Todd A (2012) 'Complex and hypercomplex discrete Fourier transforms based on matrix exponential form of Euler’s formula.' Applied Mathematics and Computation, 219 (2). pp. 644-655. ISSN 0096-3003

Sangwine, Stephen J and Ell, Todd A and Le Bihan, Nicolas (2011) 'Fundamental Representations and Algebraic Properties of Biquaternions or Complexified Quaternions.' Advances in Applied Clifford Algebras, 21 (3). pp. 607-636. ISSN 0188-7009

Ell, Todd A and Sangwine, Stephen J (2007) 'Quaternion involutions and anti-involutions.' Computers & Mathematics with Applications, 53 (1). pp. 137-143. ISSN 0898-1221

## Book

Ell, Todd A and Bihan, Nicolas Le and Sangwine, Stephen J (2014) Quaternion Fourier Transforms for Signal and Image Processing. John Wiley & Sons, Inc., pp. 1-136.