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The device shown above is to be used for scanning communication lines with a variable sampling speed which is set according to the characteristics (frequency, bandwidth) of the lines.
English (United States)
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Programmable Variable Speed Scanner
The device shown above is to be used for scanning communication lines
with a variable sampling speed which is set according to the characteristics
(frequency, bandwidth) of the lines.
The lines to be scanned, L1 to L16, are connected to selector circuit SEL
which is controlled by line addresses A, B, C, D to provide an output signal on
output line OUT.
The read-only store (ROS), programmable counter CTR1 controlled by clock
signal CLK, counter CTR2 and single-shot SS are used to program the scanning
time devoted to each line.
The carry output of counter CTR1, the count of which is varied from 2 to 16,
is used as an input for counter CTR2. The ROS is addressed by the outputs QA
to QD of counter CTR2. Output lines 0 to 3 of ROS are converted to address
selector SEL, and output lines 4 to 7 are connected to programmable counter
CTR1 to set the scan time of the addressed line. Lines x,y,z,w correspond to any
of the lines L1 to L16 to be scanned.
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