Browse Prior Art Database

Generation of Data Transition Pulses From Phase Encoded Data

IP.com Disclosure Number: IPCOM000073647D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Andresen, R: AUTHOR [+2]

Abstract

The apparatus shown responds to a phase-encoded data signal and generates a data pulse at each data transition in the signal and a gate pulse for data transitions. The gate pulse is a fixed percentage of the time between data transitions.

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Generation of Data Transition Pulses From Phase Encoded Data

The apparatus shown responds to a phase-encoded data signal and generates a data pulse at each data transition in the signal and a gate pulse for data transitions. The gate pulse is a fixed percentage of the time between data transitions.

The phase-encoded data signal, waveform A, is applied to the input point. The data signal is converted into a pulse signal for each transition by delay line 10 and Exclusive OR 12. The duration of the pulses in waveform B is controlled by the length of the delay in delay line 10. The transition pulses in waveform B are then ANDed with gate pulses, shown as waveform E. The generation of the gate pulses will be discussed hereinafter. The result is that the phase transitions are removed from the waveform B, and only the data transitions are passed by AND gate 14 to single-shot 16.

Single-shot 16 generates a pulse for each pulse it receives. The duration of the output pulses from single-shot 16 is fixed by the period of the single-shot. The single-shot output represents data transition pulses, and these pulses are of fixed duration. The data transition pulses are passed to a discharge gate 20.

The discharge gate 20, capacitor 22, and the comparator 24 are used to generate the clock pulses, shown as waveform E. Capacitor 22 generates a sawtooth waveform D because it is charged by current from a voltage-to-current converter 26 and is discharged by discharge gate 20. Each tim...