Specifications

4.
Digital Echo Processing
Various digital,
statistically based, processing techniques
are employed to render the Level Genie immune to random noise
inputs.
a.
Echo width detection ignores short duration signals
such as line transients and most SCR noise.
b. Echo reception logic accepts only one echo per
transmit sequence.
C.
Digital windows are established at the"NEAR'and
'FAR'setpoints and only echoes occurring in these
zones are recognized.
d.
It requires three valid echoes in three successive
transmit sequences in order to trigger an output
response.
3-4