Abstract: A system for synthesizing speech having improved naturalness and formed by a simple construction. The speech synthesizing system includes a unit for generating a vowel signal, a unit for generating a consonant signal including a unit for generating random data, a unit connected to the random data generating unit for receiving the random data therefrom, and having a first-order delaying function 1/(s.tau.+.alpha.). The unit having a first-order delay for receiving the random data outputs first-order delayed random data. A unit for selecting the vowel signal or the consonant signal in response to a selection signal and a unit for receiving an output signal from the selection unit and filtering the received signal on the basis of a vocal tract simulation method are also provided. The first-order delayed random data from the first-order delaying unit are substantially applied to the vowel signal and/or the consonant signal.

Abstract: Described is an error-correcting and error-detecting system including a check-bits generating circuit which is formed in accordance with a (k,l) type check matrix, such (k,l) type check matrix being formed from an (m,l) type reference sub-matrix (where m<k) and one or more (m,l) type sub-matrices, and each of the (m,l) type sub-matrices being derived from the (m,l) type reference sub-matrix by replacing unit-matrices of the (m,l) type reference sub-matrix with each other in accordance with a circular shift; wherein a desired check-bits code of an input data is obtained by multiplying the input data with respective reference sub-matrix and sub-matrices and by rearranging respective multiplied results produced from the respective rows of these reference sub-matrix and sub-matrices.