A signal encoding method and device and a method for encoding a joint feedback signal are provided. A gas port leading to the suction side space is provided on one of both cylinder blocks, and a gas port leading to the discharge side space is arranged on the other. Thus, automatically retrieving a frequency band corresponding to one connected broadcasting mode of a terrestrial broadcasting mode and a cable broadcasting mode is possible. The system automatically applies the verified selected attributes to the group. The labeling reagents can be isomeric or isobaric and can be used to produce mixtures suitable for multiplex analysis of the labeled analytes. An active-region is sandwiched between an n-type layer and a p-type layer forming an LED structure, and the conductive grid is in ohmic contact with the n-type layer.