Phaseless equalizer

Apparatus for boosting the high frequency components of an input signal without introducing phase shift to provide a crispened output signal comprising

• amplifier means including a transistor having a control electrode and a first and a second output electrode,
• means including a first differentiating circuit for applying said input signal to said control electrode, said first differentiating circuit having a selectable time constant,
• means including a second differentiating circuit connected between one of said output electrodes and AC ground,
• means including a circuit having a selectable time constant connected between the other of said output electrodes and AC ground, the time constant of said circuit being substantially equal to the time constant of said first differentiating circuit,
• means for combining first and second applied signals to provide an output signal, said combiner means receiving said input signal as one of said applied signals, and
• means for connecting said one of said output electrodes to said combiner means as the other of said applied signals, whereby said combiner means output signal is said crispened output signal.

Apparatus for generating an output signal U.sub.o of the form U.sub.o = K.omega..sup.2 U.sub.i, where U.sub.i is the input signal, comprising

• amplifier means including a transistor, having a control electrode and a first and a second output electrode,
• means for applying said input signal to said control electrode,
• circuit means connected to the control electrode and one of said output electrodes for double differentiating said input signal,
• circuit means connected to the other of said output electrodes for compensating for the time constant of the portion of said double differentiating circuit means connected to said control electrode, and
• means connected to said one of said output electrodes for providing said output signal.

Apparatus for generating an output signal U.sub.o of the form U.sub.o = U.sub.i (1 .+-. k.omega..sup.2) where U.sub.i is the input signal, comprising

• amplifier means including a transistor, having a control electrode and a first and second output electrode,
• means for applying said input signal to said control electrode,
• circuit means connected to the control electrode and one of said output electrodes for double differentiating said input signal,
• circuit means connected to the other of said output electrodes for compensating for the time constant of the portion of said double differentiating circuit means connected to said control electrode,
• means for combining first and second applied signals to provide an output signal, said combiner means receiving said input signal as one of said applied signals, and
• means for connecting said one of said output electrodes to said combiner means as the other of said applied signals whereby said combiner means output is said output signal U.sub.o.

Apparatus for boosting the high frequency components of an input signal without introducing phase shift to provide a crispened output signal comprising

• amplifier means including a transistor, having a control electrode and a first and second output electrode,
• means receiving said input signal for providing a current responsive to said input signal,
• potentiometer means, having an adjustable rider, receiving said current for developing a voltage responsive to said current,
• first differentiating circuit means having a selectable time constant connected between the rider of said potentiometer and said control electrode,
• second differentiating circuit means comprising inductor means receiving said current and connected to one of said output electrodes,
• circuit means having a selectable time constant connected between the other of said output electrodes and AC ground, the time constant of said circuit means being substantially equal to the time constant of said first differentiating circuit means, and
• output means connected to said one of said output electrodes for providing said output signal.

Apparatus for boosting the high frequency components of an input signal without introducing phase shift to provide a crispened output signal comprising

• amplifier means including a transistor, having a control electrode and a first and a second output electrode,
• means receiving said input signal for providing a current responsive to said input signal,
• first differentiating circuit means having a selectable time constant receiving said current, said circuit means including parallel inductor means and potentiometer means having an adjustable rider,
• means for connecting said rider to the said control electrode,
• first circuit means having a selectable time constant connected between one of said output electrodes and AC ground, the time constant of said circuit means being substantially equal to the time constant of said first differentiating means, and
• output means including second differentiating circuit means connected to the other of said output electrodes, said output means including non-linear process means.