Abstract
The introduction to signals starts with a clear distinction between “physical signals” and “mathematical signals”, the model for physical signals. Considering the variety of signals encountered in applications (continuous-time, discrete-time, one-dimensional, two-dimensional, etc.), the model of deterministic signals is applied, with the conclusion that a first unified model has the form s(t), t∈I, where s is a complex function defined on an appropriate domain I. But this is only a notational convenience. The second step to unification concerns the mathematical structure the domain I should have, with the conclusion that I must be an Abelian group. The final step is the identification of a linear functional that permits the introduction of the signal fundamental operations, such as convolution, Fourier transformation and linear filtering. It is shown that the right functional is provided by the Haar integral, which permits defining the signal operations in a unified form.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Notes
- 1.
A similar synoptic theory may be found in [4].
- 2.
In the Unified Theory, I is a pair of Abelian groups which represent both the domain and the periodicity of the signals. But, in these preliminaries it is sufficient to consider only the domain.
References
G. Cariolaro, Teoria dei Segnali (Cleup, Padova, 1970)
J.W. Cooley, J.W. Tukey, An algorithm for the machine computation of complex Fourier series. Math. Comput. 19, 297–301 (1965)
A. Haar, Der Massbegriff in der Theorie der kontinuierlichen Gruppen. Ann. Math. 34, 147–169 (1933)
P. Kraniauskas, Transforms in Signals and Systems (Addison–Wesley, Wokingham, 1992)
B.M. Oliver, J.R. Pierce, C.E. Shannon, The philosophy of PCM. Proc. IRE 36, 1324–1332 (1948)
C.E. Shannon, A mathematical theory of communication. Bell Syst. Tech. J. XXVII (July 1948)
C.E. Shannon, Communication in the presence of noise. Proc. IRE 37, 10–21 (1949)
References on the History of Signal Theory
A.L. Cauchy, Mémoire sur diverses formulaes dé analyse. Comptes Rendus 12, 283–298 (1841)
J.W. Cooley, P.A.W. Lewis, P.D. Welch, Historical notes on the fast Fourier transform. IEEE Trans. Audio Electroacoust. AU–15, 76–79 (1967)
W.C. Dampier, A History of Science (Macmillan & Co., New York, 1943)
C.F. Gauss, Nachlass: Theoria interpolationis methodo nova tractata, in Carl Friedrich Gauss, Werke, vol. 3 (Königlichen Gesellschaft der Wissenschaften, Göttingen, 1866), pp. 265–303
O. Heaviside, Electromagnetic Theory, vol. I (Chelsea, Manchester, 1971)
J.M. Manley, The concept of frequency in linear system analysis. IEEE Commun. Mag. 20, 26–35 (1982)
H. Nyquist, Certain factors affecting telegraph speed. Bell Syst. Tech. J. 3, 324–346 (1924)
J.W.S. Rayleigh, Theory of Sound, 1st edn. (Macmillan & Co., London, 1894)
W. Thomson, Theory of electric telegraph. Proc. R. Soc. VII, 382 (1855)
S.P. Thompson, Life of Lord Kelvin (Macmillan & Co., London, 1910)
W. Thomson, On transient electric currents. Philos. Mag. (June 1927)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
Copyright information
© 2011 Springer-Verlag London Limited
About this chapter
Cite this chapter
Cariolaro, G. (2011). Introduction. In: Unified Signal Theory. Springer, London. https://doi.org/10.1007/978-0-85729-464-7_1
Download citation
DOI: https://doi.org/10.1007/978-0-85729-464-7_1
Publisher Name: Springer, London
Print ISBN: 978-0-85729-463-0
Online ISBN: 978-0-85729-464-7
eBook Packages: EngineeringEngineering (R0)