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Phase Analyzer Disclosure Number: IPCOM000076100D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 47K

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Abramson, RF: AUTHOR


A CRT screen displays phase-modulated data as points having Y-positions indicating their phase.

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Phase Analyzer

A CRT screen displays phase-modulated data as points having Y-positions indicating their phase.

The analog signal represents data which may be extracted by reversing a signal for each analog peak, to provide a self-clocked data signal having alternate positive clock and data transitions. The variance between the positive data transitions and timing signals indicates the phase shift. The timing signals are derived from the positive clock transitions by generating a fixed-length timing signal starting with each positive clock transition. On the CRT screen, each positive data transition appears as an intensified spot on a sawtooth signal spanning the duration of each timing signal. The later the positive data transition occurs, the higher on the screen it will appear.

The positive transitions supply data and clock pulses to a flip-flop FF through a diode D and single-shot SS1. The clock pulses cause a fixed duration (t) timing signal from SS2 to supply an equal duration ascending sawtooth voltage to the CRT vertical plates. A variable-sweep signal from a horizontal sawtooth generator causes a series of sawtooth signals to form a vertical raster on the screen. Each data pulse causes SS3 to supply an intensifying signal to the CRT.

If desired, negative transitions of the data signals can be received through an inverter in place of, or in addition to, the positive transitions. The clock and data transition effects can also be reversed. Also, the analog s...