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== Theoretical Development ==
[[File:Class 4 Partial-Response Eye Diagram.jpg|thumb|Continuous-time Partial-Response (class 4) and corresponding 'eye pattern']]
'''Partial-response''' was first proposed by Adam Lender in 1963.<ref>[https://ieeexplore.ieee.org/abstract/document/6373379 A. Lender, "The duobinary technique for high-speed data transmission", Trans. AIEE, Part I: Communication and Electronics, Vol. 82 , No. 2 , pp. 214-218, May 1963]</ref> The method was generalized by Kretzmer in 1966. Kretzmer also classified the several different possible responses,<ref>[https://ieeexplore.ieee.org/document/1089288 E. Kretzmer, "Generalization of a Techinque for Binary Data Communication", IEEE Trans. Comm., Vol. 14, No. 1, pp. 67-68 Feb. 1966]</ref> for example, PR1 is duobinary and PR4 is the response used in the classical PRML. In 1970, Kobayashi and Tang recognized the value of PR4 for the [[magnetic recording]] channel.<ref>[https://ieeexplore.ieee.org/document/5391640 H. Kobayashi and D. Tang, "Application of Partial-response Channel Coding to Magnetic Recording Systems", IBM J. Res. Dev., Vol, 14, No. 4, pp. 368-375, July 1970]</ref> <br>
'''[[Maximum-likelihood]]''' decoding using the eponymous [[Viterbi algorithm]] was proposed in 1967 by [[Andrew Viterbi]] as a means of decoding [[convolutional codes]].<ref>[https://ieeexplore.ieee.org/document/1054010 A. Viterbi, "Error bounds for convolutional codes and an asymptotically optimum decoding algorithm", IEEE Trans. Info. Theory, Vol. 13, No. 2, pp. 260-269, Apr. 1967]</ref> <br>
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