| 摘要 |
PURPOSE:To make it possible to transmit without operating a transmitter-receiver, by providing both the elements for switching a transmitter-receiver circuit and a speaker telephone circuit, and the switching elements for connecting the transmitter- receiver circuit and inserting an attenuation element into the speaker the telephone circuit, when the push button has been operated. CONSTITUTION:This telephone set is provided with elements F1, F2, etc. for switching and connecting a transmitter-receiver circuit K equipped with a push-button dial circuit TG, and a speaker telephone circuit H, to the speech paths L1, L2. In addition, it is provided with switching elements G1, G2, etc. for connecting the transmitter-receiver circuit K to the speech paths L1, L2 and also inserting an attenuating circuit element R into the loud speaker telephone circuit H, by operating the push- button dial TG when the loud speaker telephone circuit H is connected to the speech paths L1, L2. At the time of transmission by a loud speaker telephone, for instance, by use of a circuit shown in the figure, when the key Y, and subsequently, the push-button dial TG is pushed, the common contacts G1, G2 are operated so that connection is made to the other party which is desired. |
