Method of and system for generating digital test signals

Details Method of and system for generating digital test signals Method of and system for generating digital test signals

1977-12-29

1979-07-17

Robinson, Thomas A.

H04J 314, H04L 300

Patent

active

041616278

ABSTRACT:
To test the performance of a PCM terminal operating in the TDM mode, a simulated message or noise signal is generated by extracting a recurrent sequence of code words from a read-only memory, the stored code words representing a set of values logarithmically related to sucdessive amplitudes of a sine wave or other periodic oscillation to be reproduced. These words are read out at a fixed scanning frequency f.sub.o but with skipping of (p-l) memory stages if a signal frequency pf.sub.o is to be simulated. A volume selector generates supplemental code words which are additively or subtractively combined with the extracted code words to simulate a desired voltage level. The resulting code words are compressed in a code converter in which the quantum steps of the segments of a compander characteristic, conforming to the chosen logarithmic function, are stored in another read-only memory.

REFERENCES:
patent: 3798635 (1974-03-01), Candiani
patent: 3911225 (1975-10-01), Mignon

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