Patent ID: 6016468
Filing Date: 2000-01-18
Classification: G10L

Abstract:
A speech signal coding apparatus comprising:(a) means for analysing an input speech signal to generate variable control signal parameters of a speech synthesis filter; and(b) means for selecting at least one excitation signal component from a plurality of available signal components by generating the scalar product of the response signal of the filter to an excitation signal component and the response signal of the filter to an excitation signal component, including means for forming the signal product of a filter response signal matrix H and its transpose signal matrix H.sup.T to form a product signal matrix H.sup.T H; said selecting means including;(c) a first store for storing elements of the product signal matrix H.sup.T H;(d) a second store storing, for each pair of an excitation signal component and an excitation signal component, the address of each location in the first store which contains an element of the product signal matrix which is to be multiplied by nonzero signal elements of both excitation components of the pair; and(e) means operable to retrieve addresses from the second store, to retrieve the signal contents of locations in the first store thereby addressed, and to add the retrieved signal contents.