H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/106
H03M 5/18 (2006.01) H04L 25/49 (2006.01)
Patent
CA 1215782
ABSTRACT: "Code generator." A code generator is provided which produces a transmission code in response to a serial binary data stream applied to its input (1). The transmission code is similar to that known as WAL2 but whereas WAL2 involves a double frequency component when the binary data changes from "1" to "0" or vice versa the transmission code pro- duced by the code generator holds the output signal con- stant at a level intermediate those corresponding to the binary "1" and "0". This reduces the high frequency con- tent of the transmitted signal and consequently reduces crosstalk between channels. The code generator comprises a first current source (I1) which is connected to a summing network (R1) through a first switch (T1, T3), a second current source (I2) which is connected to the summing network (R1) through a second switch (T2, T4) and a control circuit (1-14) which produces signals on lines (13, 14) to selectively operate the first and second switches. Figure 3.
414418
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
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