Prof. Yuval Bistritz
The Iby and
Aladar Fleischman Faculty of Engineering
Yuval Bistritz received
the B.Sc. in physics and the M.Sc. and Ph.D in
electrical engineering (Summa Cum Laude), in 1973, 1978, and 1983,
What is the Bistritz (stability) criterion?
A name attached (by other researchers of course) to a simple algebraic method to determine the zero location with respect to the unit-circle of a real (or complex) polynomial that I devised in [1984,1986]. It follows a different form from the common classical forms of the Schur-Cohn Marden-Jury stability tests that makes it reminiscent of the Routh test (the well known algorithm to test stability of continuous-time systems and analog filters devised by Routh in 1877). It is the most efficient possible algebraic way to test stability of discrete-time systems and digital filters. I presented in  a more polished version of the test that behaves the same for stability testing but handles the zero location problem with extra simplicity.
What are the immittance algorithms?
Immittance is a prefix chosen for algorithms that follow the new formulation that stems from my stability test in order to distinguish them from corresponding so called scattering algorithms that follow the classical formulation (used since Levinson, Schur, Cohn, Marden and Jury). The term immittance was coined by Bode and is an abridged concatenation of impedance and admittance. I encountered W. H. Bode's book Network Analysis and Feedback Amplifier Design (1945) on Tom Kailath's shelf at Stanford just when I needed a meaningful name for the new formulation. From a mathematical perspective, the algorithms in the new formulation start with a pair of polynomials whose ratio forms a unit-circle immittance function (a function that is lossless on the unit-circle instead of on the imaginary axis).
What are the ISP / ISF parameters?
Immittance spectral pairs (ISP) or Immittance spectral frequencies (ISF) are stability parameters proposed to code speech by the LPC model . They are part of many speech compression standards: Third Generation Partnership Project (3GPP) for GSM; Third generation mobile communication WCDMA system; The ITU G.722.2 standard for wideband speech coding; The cdma2000® Variable-Rate Multimode Wideband (VMR-WB) and more.
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Last modified: June 2015.