Adaptive De-Jitter Buffer for Voice over IP for packet switch communications. Each receiver in base station or mobile station correlates for its intended data by despreading the signal using its particular one of the orthogonal codes. In some embodiments, the filter membrane may be manufactured by spray coating a filter material onto a forming member or spray mold. The two side surfaces 315 of a lower portion 31 of the conductor pattern 3 are coated by a solder resist.