77. The CPP of claim 67 , wherein the vector is an input line spectral frequency (LSF) vector including line spectral frequencies (LSFs), and each candidate codevector is an LSF vector including LSFs.
78. The CPP of claim 77 , wherein the second CRPC means comprises: CRPC means for causing the processor to determine whether the LSF vector belongs to an illegal space representing illegal LSF vectors; and CRPC means for causing the processor to declare the LSF vector legal when the LSF vector does not belong to the illegal space.