| 摘要 |
A digital attenuator to stepwise modify multiple controlled signals including generator to provide counter signals at selected frequency, a counter to count the signals having multiple counter outputs to provide a counter output signal when activated and adapted to selectively activate each counter output in selected sequence in response to selected numbers of counter signals so the counter provides a repeated pattern of output signals at the output means to provide a counter output control cycle, multiplexer having a selected number of multiplex signal inputs each adapted to receive binary input signals from selected signal generator multiplex control means to selectively connect each of the multiplex inputs is connected to the multiplex outputs during each counter output control cycle, signal storage device having an input connected to the multiplex outputs to store the multiplex output signals to provide a stored binary signal indicative of the sum of the number of multiplex output signals received during one counter cycle, signal attenuator having multiple attenuator signal inputs of different impedance each adapted to receive controlled signals and provide an attenuated signal output, an attenuator controller including attenuator switches to interconnect selected attenuator inputs with the attenuated signal output where the attenuator controller includes signal inputs to receive the stored binary signal and activate the attenuator controller in response thereto to selectively interconnect a portion of the attenuator signal input with the attenuated signal output.
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