Solid state proportional commutator

Claim 1

A SIGNAL PROCESSING APPARATUS FOR PROCESSING SIGNALS RECEIVED BY A PLURALITY OF SENSORS TO PERMIT DETERMINATION OF THE BEARINGS OF THE SOURCES OF SAID SIGNALS, COMPRISING: FIRST MEANS FOR SUPPLYING A PLURALITY OF INFORMATION SIGNALS, EACH REPRESENTATIVE OF THE SIGNALS RECEIVED BY A CORRESPONDING SENSOR; SECOND MEANS FOR SUPPLYING A SAMPLING WAVEFORM PROVIDING A PLURALITY OF GATING SIGNALS; THIRD MEANS FOR SUPPLYING A PLURALITY OF SINUSOIDAL WAVEFORMS WHOSE FREQUENCY IS SUBSTANTIALLY LOWER THAN THE REPETITION RATE OF SAID GATING SIGNALS; AND A PLURALITY OF LOGIC CIRCUITS, EACH RESPONSIVE TO ONE OF SAID INFORMATION SIGNALS, ONE OF SAID SINUSOIDAL WAVEFORMS AND A PLURALITY OF SAID GATING SIGNALS SELECTED BY COUPLING EACH SUCCESSIVE GATING SIGNAL TO A SEPARATE LOGIC CIRCUIT IN A SEQUENTIAL REPETITIVE PATTERN, FOR PRODUCING AN OUTPUT SIGNAL CORRESPONDING TO EACH SENSOR COMPRISING SAID SELECTED PLURALITY OF GATING SIGNALS WHOSE ENVELOPE REPRESENTS SAID SINUSOIDAL WAVEFORM AMPLITUDE MODULATED BY SAID INFORMATION SIGNAL;