ES404459A1 - Signal converter apparatus for two level binary signals - Google Patents

Abstract

Refinements in asynchronous demodulating apparatus, of the type comprising input means for supplying the demodulator input with a serial binary input signal of two-level asynchronous binary input bits having a repetition rate of uneven bits, whose input bits they have transition parts that extend between two levels of amplitude; and timing reference means for measuring the length of the successive bits of said input bits and for producing a time reference signal corresponding to the length of each input bit, characterized in that said timing reference means comprises means for producing a first ramp signal, of predetermined inclination during the period of each input bit length, to provide a ramp signal amplitude level at the end of said period, from which the timing reference signal is derived, such that the value of said reference signal automatically changes in response to changes in the length of said input bits, due to variations in the bit rate or rhythm, and comparing means to produce a second predetermined tilt ramp signal corresponding to the time between the transition parts of said input bits to compare dich a second ramp signal with the time reference signal, derived from said first ramp signal from the input bit immediately coming to determine whether the compared input bit is a binary one or a binary zero, and to produce an output signal binary serial corresponding to said input signal but of different code, said comparing means also comprising means for producing a third predetermined tilt ramp signal corresponding to the space time between successive input bits and for comparing said third bit ramp signal time reference signal derived from said first input bit ramp signal immediately proceeding to produce a stop pulse indicating the end of the input signal. (Machine-translation by Google Translate, not legally binding)