The present invention carries out pre-selection on many LPC codevectors stored in an LSF codebook 101 using a weighted Euclidean distortion as a measure and carries out a full-code selection on the LPC codevectors left after the pre-selection using an amount of distortion in a spectral space as a measure. The implant consists of titanium or a titanium alloy and is suitable for the implantation in bones. Directionally sensitive biasing elements rather than springs are used in one-way clutches for extending or retracting inertially balanced swivelling pawls. This arbitration scheme is flexible because it contains a readwrite priority module, which can be programmed to execute any order of priority combination of read and write commands.