Indanes, benzopyrans and analogues thereof are potassium channel inhibitors and blockers of IKur and have the structure . A common circuit is used in a structure for eliminating noise based on a double smoothing method and a structure for making the outline sharp based on an unsharp masking method. One erase-enable line connected to the erase-scan and the data driving circuits is used to control the signals of these two circuits. A heating element may also be provided within the housing for controlling the heating and cooling of the heat emitter. The manner in which the route is processed against the set of keys is the same in both instances, so that the DHT may be used to store and retrieve route information on the network. The circuit provides for temporarily setting the circuit outputs which can then be used for testing.