GB1468579A - Control equipment responsive to coded control signals - Google Patents

Abstract

1468579 Automatic control ROTARY CLUB GENEVE SUD 25 April 1974 [25 April 1973] 18162/74 Heading G3N [Also in Division G4] A coded control signal, given by a human operator, having successive long or short elements is transduced to electric signals and the elements compared with a reference signal having a value intermediate of the extreme values of the signals whereby the short or long elements are identified and subsequently decoded for controlling the operation of an electrically controllable apparatus. A shown, short or long control impulses i are selectively provided at a shaping circuit 9 from a micro-switch 7 or a microphone 4 responsive to whistling or fricatives through a high-pass amplifier 8. The output is of the shaping circuit is fed to miller integrators 10, 11 which are reset at the beginning of an element by a signal Z. Integrator 10 integrates the duration of the element of the signal and retains it during the interval between elements, whereas integrator 11 integrates the duration of the space between elements. The number of elements is counted by a ring counter 13 which controls the transfer of the contents d of the integrator 10, through field-effect switches S1-S6 into capacitive memory units 12a-12f To determine whether the level held in a memory unit is a dot or a dash, the output is passed to a comparator 14a-14f in which it is compared with a reference r common to all comparators which has been held in a store 15 from an n or <SP>1</SP>/ n logic circuit 16 which compares all but the first element with the value of the first element. The states of comparators 14 and counter 13 are decoded by a diode matrix 17 to select the wanted letter, or operating function, before its performance by an electric typewriter, (not shown), through control circuits 22. A lag between decoding and operation is provided by a comparator 18 responsive to the output of integrator 11 and the reference r which controls a printing circuit 19. All circuits are set to zero by a circuit 21. A comparator 20 can be provided to cause the matrix 17 to order a space after a set time interval between code signals. The matrix 17 through switching equipment 24 can determine whether the electric typewriter or external operating circuits, such as TV, radio, lights &c. are controlled by decoded signals.