| 摘要 |
Trans-hybrid balance is provided for a range of line characteristics of a 2-wire line coupled to a 4-wire digital communication circuit comprising a send circuit and a receive circuit. The coupling of the 2-wire line to the 4-wire communication circuit is facilitated by a programmable n-tap Finite Impulse Response filter comprising n-tap coefficients. The trans-hybrid balance of the filter is achieved by perturbing each tap coefficient positively by a predetermined value and then perturbing each coefficient negatively by a predetermined value. After each perturbation a test pulse of a predetermined length is injected into the receiver circuit and an error signal produced by the test pulse is read by error measuring appts. coupled to the send circuit and stored in a memory associated with a processor. A gradient is calculated by the processor for each coefficient until the magnitude of all gradients adjusts below a predetermined value stored in the processor.
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