Digital fundamental prp analyzer for pulse train signals

Claim 2

A pulse-repetition-period (PRP) analyzer comprising, in combination: means for converting an input waveform into a series of equal binary pulses, each occurring whenever said input waveform exceeds a predetermined level; means connected to said binary converter means for sorting the pulses therefrom into a series of pulse trains ordered according to their pulse repetition periods; means connected to said pulse-sorting means for rejecting from each pulse train any pulses constituting a harmonic rather than a fundamental wave in the input to said binary converter; means connected to said harmonic-rejection means for individually integraTing said fundamental pulse trains, the integrating periods being weighted in proportion to the relative lengths of the periods of said pulse trains; and scanning means connected to said weighted integration means for sampling the outputs therefrom in time sequence, thereby referencing each output in time according to its period.

Claim 3

A pulse-repetition-period (PRP) analyzer comprising, in combination: means for converting an input waveform into a series of equal binary pulses, each occurring whenever said input waveform exceeds a predetermined level; means connected to said binary converter means for sorting the pulses therefrom into a series of pulse trains ordered according to their pulse repetition periods; means connected to said pulse-sorting means for rejecting from each pulse train any pulses constituting a harmonic rather than a fundamental wave in the input to said binary converter; means connected to said harmonic-rejection means for individually integraTing said fundamental pulse trains, the integrating periods being weighted in proportion to the relative lengths of the periods of said pulse trains; and scanning means connected to said weighted integration means for sampling the outputs therefrom in time sequence, thereby referencing each output in time according to its period.

Claim 4

A pulse-repetition-period (PRP) analyzer comprising, in combination: means for converting an input waveform into a series of equal binary pulses, each occurring whenever said input waveform exceeds a predetermined level; means connected to said binary converter means for sorting the pulses therefrom into a series of pulse trains ordered according to their pulse repetition periods; means connected to said pulse-sorting means for rejecting from each pulse train any pulses constituting a harmonic rather than a fundamental wave in the input to said binary converter; means connected to said harmonic-rejection means for individually integraTing said fundamental pulse trains, the integrating periods being weighted in proportion to the relative lengths of the periods of said pulse trains; and scanning means connected to said weighted integration means for sampling the outputs therefrom in time sequence, thereby referencing each output in time according to its period.

Claim 5

A PRP analyzer as set forth in claim 1, including means for visually displaying the output of said scanning means.

Claim 6

A PRP analyzer as set forth in claim 1, wherein said pulse-sorting means comprises a shift register having N bits with N parallel outputs and a set of N AND gates, each connected to a different one of said parallel outputs, and each connected also to the input of said shift register, each AND gate comprising a separate channel.

Claim 7

A PRP analyzer as set forth in claim 1, wherein said pulse-sorting means comprises an R-bit, serial, shift register, an S-bit parallel-output shift register, and a set of S AND gates, said R-bit register being connected between said binary converter and said S-bit register, the output of each bit of the latter being connected to a different one of said AND gates, the input to said S-bit register also being connected in common to all said AND gates, the total time-analysis range of the analyzer then being equal to (R + S) times the resting time between the shifting of the bits and the PRP analysis being done only on the last S bits.

Claim 8

A PRP analyzer as set forth in claim 3, wherein said harmonic-rejection means comprises a plurality of means, each connected to receive the output of a different one of said channels and each comprising an M-bit, parallel-output shift register, an M-bit, parallel-input, shift register, a set of M AND gates, an inverter and an output AND gate, the input from one channel of said pulse-sorting means being fed to said parallel-output register, each of said set of AND gates being connected to the output of a different bit of said parallel-output register and the input to said parallel-output register being connected to all said AND gates in common, the output of each AND gate being connected to a different bit in said parallel-input register in reversed order so that the output of the first gate goes to the last bit and the output of the last gate goes to the first bit, the output of the parallel-input register being fed to said inverter, and the output of said inverter and the input to said parallel-output register being fed as inputs to said output AND gate.

Claim 9

A PRP analyzer as set forth in claim 5, wherein said weighted integration means comprises a set of N weighted integrators, each connected to a different one of said harmonic-rejection-means output AND gates, the relative weights being calculated so that the integration period of each integrator in the set is proportional to the length of the period of its input pulse train, whereby the resulting output of each integrator is substantially equal in amplitude.