A portable multimedia and communications device can include a transducive element for receiving sound. A parameter estimator determines an AD parameter vector PAD which describes the nonlinearities of the ADC. A second solution includes: encoding each group of four bit of the pattern signal adding a parity check bit as an intermediate rate \u2158 code; encoding each of the five bits using the biphase map. A biasing force is exerted on the two opposed legs by a biasing mechanism. The tool compares the design to specifications and returns a list of violations on a segment basis. The rigidity of the traction bar and design of the spacer block eliminate wheel hop and axle wrap while maintaining a level vehicle drive height.