Function File: [b_out, a_out] = invimpinvar (b, a, fs, tol) ¶

Function File: [b_out, a_out] = invimpinvar (b, a, fs) ¶

Function File: [b_out, a_out] = invimpinvar (b, a) ¶

Converts digital filter with coefficients b and a to analog, conserving impulse response.

This function does the inverse of impinvar so that the following example should restore the original values of a and b.

[b, a] = impinvar (b, a);
[b, a] = invimpinvar (b, a);

If fs is not specified, or is an empty vector, it defaults to 1Hz.

If tol is not specified, it defaults to 0.0001 (0.1%)

Reference: Thomas J. Cavicchi (1996) “Impulse invariance and multiple-order poles”. IEEE transactions on signal processing, Vol 40 (9): 2344–2347

See also: bilinear, impinvar.

Package: signal