Electronic telephone set

Abstract

Electronic telephone set, comprising a transmission circuit arranged for being coupled to a telecommunication network and for receiving and transmitting speech signals, a keyboard means comprising a first matrix with respective numbers of intersecting first and second conductors and at the intersections of the first and second conductors key switches coupled to the respective first and second conductors for producing dial information and status information and including a second matrix with one intersecting first and second conductor or a plurality thereof respectively, and having setting circuits conducting current in one and the same direction coupled to the respective first and second conductors at selected intersections of the latter first and second conductors, whereas all second conductors of the second matrix are arranged common to those of the first matrix, and including a control circuit arranged for generating dialling signals compatible with the telecommunication network in response to the dialling information produced by the keyboard means and controlling the operation of the telephone set in response to the status information produced by the keyboard means, which control circuit comprises scanning means for reading the two matrices, characterized in that all first conductors of the second matrix are in common with those of the first matrix and in that the scanning means scan the first conductors when reading the first matrix and scan the second conductors when reading the second matrix.