Filter and substitute for resonant reed relay

Claim 2

A filter circuit for simultaneously providing a plurality of outputs comprising means for producing a low-passband output, means for producing a band-pass output and said means for producing a low passband output and said means for producing a band-pass output comprising a monostable multivibrator having an input and an output and a differential amplifier having a first and second input and a first and a second output, said output of said monostable multivibrator being connected to said first input of said differential amplifier, a reference point, said second input of said differential amplifier connected to said reference point, said reference point having a signal which is not dependent on the input signal, whereby the low-passband is obtained from said first differential amplifier output and said band-pass output is taken from said second differential amplifier output.

Claim 3

A filter circuit for simultaneously providing a plurality of outputs comprising means for producing a high passband output, means for producing a band-pass output and said means for producing a high passband output and said means for producing a band-pass output comprising a monostable multivibrator having an input and an output and a differential amplifier having an input and a first and a second output, said output of said monostable multivibrator being connected to said input of said differential amplifier, whereby the high passband is obtained from said first differential amplifier output and said band-pass output is taken from said second differential amplifier output.

Claim 4

A filter circuit for simultaneously providing a plurality of outputs comprising means for producing a high passband output, means for producing a band-pass output and said means for producing a high passband output and said means for producing a band-pass output comprising a monostable multivibrator having an input and an output and a differential amplifier having an input and a first and a second output, said output of said monostable multivibrator being connected to said input of said differential amplifier, whereby the high passband is obtained from said first differential amplifier output and said band-pass output is taken from said second differential amplifier output.

Claim 5

A filter circuit as defined in claim 2, but further characterized by having a means for producing a frequency modulated detector output comprising a resistor connected in series with a capacitor, said resistor being connected to said second output of said differential amplifier and said modulated detector output taken from the junction of said resistor and said capacitor.

Claim 6

A filter circuit as defined in claim 1, but further characterized by having a means for producing a frequency modulated detector output comprising a resistor connected in series with a capacitor, said resistor connected in series with a capacitor, said resistor being connected to said second output of said differential amplifier and said modulated detector output taken from the junction of said resistor and said capacitor.

Claim 7

A filter circuit as defined in claim 2, but further characterized by having an electronic switching means having an input and an output, a relay connected to said switching means output and said switching means input connected to said band-pass output whereby said filter circuit and said relay performs the functions of a resonant reed relay.

Claim 8

A filter circuit as defined in claim 1, but further characterized by having an electronic switching means having an input and an output, a relay connected to said switching means output and said switching means input being connected to said band-pass output whereby said filter circuit and said relay performs the functions of a resonant reed relay.

Claim 9

A filter circuit for simultaneously providing a plurality of different distinct output signals having different frequency characteristics comprising a monostable multivibrator having an input and an output, a differential amplifier having a first and second input and a first and second output, said first input of said differential amplifier being connected to the output of Said monostable multivibrator means connected to said second input of said differential amplifier for varying the frequency midpoint of one of said output signals, and whereby said output signals are taken from the output of said differential amplifier.

Claim 10

A filter circuit for simultaneously providing a plurality of different distinct output signals having different frequency characteristics comprising a monostable multivibrator having an input and an output, a differential amplifier having a first and second input and a first and second output, said first input of said differential amplifier being connected to the output of Said monostable multivibrator means connected to said second input of said differential amplifier for varying the frequency midpoint of one of said output signals, and whereby said output signals are taken from the output of said differential amplifier.

Claim 11

A filter circuit as defined in claim 7, but further characterized by said monostable multivibrator comprising a pair of cross-coupled transistors and said differential amplifier comprises a pair of transistors having their emitters connected together at a common junction point.

Claim 12

A filter circuit as defined in claim 1 but further characterized by said multivibrator comprising a pair of cross-coupled transistors and said differential amplifier comprises a pair of transistors having their emitters connected together at a common junction.

Claim 13

A filter circuit as defined in claim 8, but further characterized by having an electronic switching means having an input and an output, a relay connected to said switching means output and said switching means input being connected to said second output of said differential amplifier whereby said filter circuit and said relay performs the functions of a resonant reed relay.

Claim 14

A filter for producing a plurality of outputs comprising a first and second transistor, each transistor having a base electrode, an emitter electrode and a collector electrode, said emitter electrodes being connected together, said first transistor base electrode coupled to said collector electrode of said second transistor, and said second transistor base electrode coupled to said collector electrode of said first transistor, a third and fourth transistor, said third and fourth transistor each having an input electrode, a control electrode and an output electrode, said input electrodes of said third and fourth transistors being connected together, said control electrode of said third transistor being coupled to said collector electrode of said second transistor, a resistive impedance being connected to said control electrode of said fourth transistor, said output electrode of said third transistor supplying a first output signal, a fifth transistor having a control electrode and an output electrode, said fifth transistor control electrode being connected to said output electrode of said fourth transistor, a relay, said relay being connected to said fifth transistor output electrode whereby said filter controls the operation of said relay causing said relay to simulate the function of a resonant reed relay.

Claim 15

A filter for producing a plurality of outputs comprising a first and second transistor, each transistor having a base electrode, an emitter electrode and a collector electrode, said emitter electrodes being connected together, said first transistor base electrode coupled to said collector electrode of said second transistor, and said second transistor base electrode coupled to said collector electrode of said first transistor, a third and fourth transistor, said third and fourth transistor each having an input electrode, a control electrode and an output electrode, said input electrodes of said third and fourth transistors being connected together, said control electrode of said third transistor being coupled to said collector electrode of said second transistor, a resistive impedance being connected to said control electrode of said fourth transistor, said output electrode of said third transistor supplying a first output signal, a fifth transistor having a control electrode and an output electrode, said fifth transistor control electrode being connected to said output electrode of said fourth transistor, a relay, said relay being connected to said fifth transistor output electrode whereby said filter controls the operation of said relay causing said relay to simulate the function of a resonant reed relay.