H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/25
H04Q 11/04 (2006.01) H04Q 11/06 (2006.01)
Patent
CA 1156749
ABSTRACT OF THE DISCLOSURE A digital pad switch is inserted in each highway of a time-division speech network in which there are disposed on the backward side of the speech network time switches, each reading out speech information from a speech memory in the order of address, assigning the memory address by the output from a channel counter. The digital pad switch is arranged so that it may send out, under the control of a common control unit, a selected one of the same signal as an input signal from each path to the digital pad switch, signals respectively having attenuated the input signal by predetermined amounts and a zero level signal regardless of the magnitude of the input signal. In the case of cutting off a speech path set up in the time-division speech network, the digital pad switch is con- trolled by the common control unit to send out the zero level signal as a signal of the speech path passing through the digital pad switch, and after writing the zero level signal in the speech memory of the time switch on the backward side, the speech path is cut off. A continuous tone signal passing through the time-divi- sion speech network is inputted to the digital time pad, which is controlled by the common control unit to selectively send out the zero level signal for a desired period of time, thereby turning ON and OFF the tone signal. In the case of sending out a howler tone, the amount of attenuation of the tone signal is decreased by the control of the common control unit in a stair- step manner. In the case of testing a multi-frequency signal receiver, a multi-frequency signal transmitter and the multi- frequency signal receiver under test are connected to the backward and the forward side of the time-division speech network, respectively, and a path is set up between them and then a signal on the path is attenuated variously by the digital pad switch to vary the level of the input signal to the multi-frequency signal receiver. Thus, the present invention permits efficient use of the digital pad switch.
362564
Ishikawa Hiroshi
Kojima Takuhito
Minamitani Eiji
Fetherstonhaugh & Co.
Fujitsu Limited
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