Abstract: A speech coder and a method for speech coding wherein the speech signal is represented by an excitation signal applied to a synthesis filter. The speech is partitioned into frames and subframes. A classifier identifies which of several categories the speech frame belongs to, and a different coding method is applied to represent the excitation for each category. For some categories, one or more windows are identified for the frame where all or most of the excitation signal samples are assigned by a coding scheme. Performance is enhanced by coding the important segments of the excitation more accurately. The window locations are determined from a linear prediction residual by identifying peaks of the smoothed residual energy contour. The method adjusts the frame and subframe boundaries so that each window is located entirely within a modified subframe or frame.

Abstract: Method and apparatus including a system of integrated ciruit devices for executing matrix operations of the form [A] operated upon by [B] equals [C], where [A], [B] and [C] are each a matrix having a plurality of elements expressed in either unsigned or in two's complement format. The system includes at least one first array of data storage means organized as (j) physical rows and (k) physical columns of bits for providing storage for one bit of each of a plurality of elements of a row vectors of the matrix [A], an individual one of the (j) rows having bits of the same binary weight. The system further includes at least one second array of data storage means organized as (m) physical rows and (n) physical columns of bits, an individual one of the (m) rows storing a same binary weight bit or each of a plurality of elements of a column vector of the matrix [B].