Abstract: A counter/divider dividing an input frequency (F1) by 2.sup.q+n +1/2, comprises a first divider by 2.sup.q (30) receiving the signal to divide of a frequency F1 and provides 2.sup.q+1 outputs at the frequency F1/2.sup.q out of phase the ones to the others of 360.degree./2.sup.q+1 ; a multiplexer (32) having a control terminal (34) and sequentially providng at its output (33) each of said 2.sup.q+1 outputs each time a control signal is applied; and a second divider by 2.sup.n (31) receiving the output (33) of the multiplexer and providing the desired output (34) of the counter/divider, this output being applied to the control terminal of the multiplexer.

Abstract: A broad operational range, automatic device for the change of frequency in the horizontal deflection of multi-synchronization monitors comprises an integrated circuit incorporating,a frequency meter being input and analog synchronization signal.a phase comparator having two inputs and in turn receiving said synchronization signal on one input,a voltage-controlled oscillator adapted to output a signal whose frequency is depending on said voltage and operatively linked to an output of said phase comparator, anda counter connected with its input, on the one side, to the oscillator output, and on the other side, to the meter output, said counter having an output connected to the other input of the phase comparator also forming the integrated circuit output.

Abstract: The level detector comprises a first capacitance having a charge circuit including a first transistor controlled by the input signal to be detected (Vi) and a discharge circuit. A second capacitance has a charge circuit including a second transistor controlled by the input signal and a discharge circuit having at least one third transistor having pre-set electrical and geometrical characteristics. The above discharge circuits are connected to the respective inputs of a comparator whose output is representative of the difference between the maximum amplitude of the input signal and a reference level depending on said electrical and geometrical characteristics of said third transistor.

Abstract: An electronic comparator device with hysteresis, being of a type which comprises a differential cell having a signal input, an output, and a threshold input, further comprises a second differential cell having one input connected to said output and the other input connected to a controlling circuit portion which has an output connected to the threshold input to reduce the threshold voltage value stepwise on the first change-over of the output of the comparator.

Abstract: A circuit for high-efficiency tuning of video frequencies comprises a closed control loop including a voltage controlled oscillator, a frequeny divider, a phase comparator, and a low-pass filter cascade interconnected via respective inputs and outputs, with the filter output connected to the oscillator input to form the loop. The circuit further comprises a second comparator connected in parallel to the phase comparator between the frequency divider output and the low-pass filter input to compare a reference frequency to a frequency from the divider when the values of each frequencies lie far apart.

Abstract: A broad operational range, automatic device for the change of frequency in the horizontal deflection of multi-synchronization monitors comprises an integrated circuit incorporating,a frequency meter being input and analog synchronization signal.a phase comparator having two inputs and in turn receiving said synchronization signal on one input,a voltage-controlled oscillator adapted to output a signal whose frequency is depending on said voltage and operatively linked to an output of said phase comparator, anda counter connected with its input, on the one side, to the oscillator output, and on the other side, to the meter output, said counter having an output connected to the other input of the phase comparator also forming the integrated circuit output.