Product/quotient deriving system

Claim 1

A system for deriving a product or a quotient of first and second electrical quantities, comprising first circuit means for converting said first electrical quantity into a first sawtooth periodic electrical signal having a repetition rate corresponding to the magnitude of the first electrical quantity, second circuit means for converting said second electrical quantity into a second sawtooth periodic electrical signal having a repetition rate corresponding to the magnitude of the second electrical quantity and being independent of said first signal, and counter means having a first input for receiving a first periodic electrical signal to be counted and a second input for receiving a second periodic electrical signal controlling the period during which said first periodic electrical signal is counted, means connecting the output of said first circuit means to said first input of said counter means and means connecting the output of said second circuit means to said second input of said counter means to count the number of periods of said first periodic electrical signal appearing during at least one period of said second periodic electrical signal.

Claim 2

A system for deriving a product or a quotient of first and second electrical quantities, comprising first circuit means for converting said first electrical quantity into a first sawtooth periodic electrical signal having a repetition rate corresponding to the magnitude of the first electrical quantity, second circuit means for converting said second electrical quantity into a second sawtooth periodic electrical signal having a repetition rate corresponding to the magnitude of the second electrical quantity and being independent of said first signal, and counter means having a first input for receiving a first periodic electrical signal to be counted and a second input for receiving a second periodic electrical signal controlling the period during which said first periodic electrical signal is counted, means connecting the output of said first circuit means to said first input of said counter means and means connecting the output of said second circuit means to said second input of said counter means to count the number of periods of said first periodic electrical signal appearing during at least one period of said second periodic electrical signal.

Claim 3

A system for deriving a product or a quotient of first and second electrical quantities comprising first circuit means for converting said first electrical quantity into a first periodic electrical signal having a repetition rate corresponding to the magnitude of the first electrical quantity, second circuit means for converting said second electrical quantity into a second periodic electrical signal having a repetition rate corresponding to the magnitude of the second electrical quantity, and counter means connected to both said first and second circuit means for counting the number of one of said first and second electrical signals appearing during at least one period of the other electrical signal, wherein at least one of said first and second circuit means comprises a first transistor, a capacitor and a source of constant voltage connected in series circuit relationship across the base and emitter electrodes of said transistor, wherein said source is connected for reversely biasing said first transistor, a second transistor having a pair of principal conducting electrodes connected in parallel with said capacitor and having a control electrode connected for biasing said second transistor into conduction in response to a conductive state of said first transistor, a resistor connected in series with said capacitor, and means for applying across said capacitor and resistor an input voltage reverse in polarity from said constant voltage, wherein a charged voltage on said capacitor in excess of said constant voltage causes said first and second transistors to conduct to discharge said capacitor, thereby to produce, in said one circuit means, the associated said periodic electrical signal having a sawtoothed waveform and having a frequency proportional to the magnitude of the input voltage.

Claim 4

A system for deriving a product or a quotient of first and second electrical quantities comprising first circuit means for converting said first electrical quantity into a first periodic electrical signal having a repetition rate corresponding to the magnitude of the first electrical quantity, second circuit means for converting said second electrical quantity into a second periodic electrical signal having a repetition rate corresponding to the magnitude of the second electrical quantity, and counter means connected to both said first and second circuit means for counting the number of one of said first and second electrical signals appearing during at least one period of the other electrical signal, wherein at least one of said first and second circuit means comprises a first transistor, a capacitor and a source of constant voltage connected in series circuit relationship across the base and emitter electrodes of said transistor, wherein said source is connected for reversely biasing said first transistor, a second transistor having a pair of principal conducting electrodes connected in parallel with said capacitor and having a control electrode connected for biasing said second transistor into conduction in response to a conductive state of said first transistor, a resistor connected in series with said capacitor, and means for applying across said capacitor and resistor an input voltage reverse in polarity from said constant voltage, wherein a charged voltage on said capacitor in excess of said constant voltage causes said first and second transistors to conduct to discharge said capacitor, thereby to produce, in said one circuit means, the associated said periodic electrical signal having a sawtoothed waveform and having a frequency proportional to the magnitude of the input voltage.

Claim 5

A system for deriving a product or a quotient of first and second electrical quantities, comprising first circuit means for converting said first electrical quantity into a first periodic electrical signal having a repetition rate corresponding to the magnitude of the first electrical quantity, second circuit means for converting said second electrical quantity into a second periodic electrical signal having a repetition rate corresponding to the magnitude of the second electrical quantity, and counter means connected to both said first and second circuit means for counting the number of one of said first and second electrical signals appearing during at least one period of the other electrical signal, wherein at least one of said first and second circuit means comprises a first transistor, a capacitor and input voltage means connected in series circuit relationship across the base and emitter electrodes of said first transistor, wherein said input voltage means is connected for reversely biasing Said first transistor, a second transistor having a pair of principal conducting electrodes connected in parallel with said capacitor and having a control electrode connected for biasing said second transistor into conduction in response to a conductive state of said first transistor, a resistor connected in series with said capacitor, and means for applying across said capacitor and resistor a constant voltage reverse in polarity from saidinput voltage means, wherein a charged voltage on said capacitor in excess of an input voltage of said input voltage means causes said first and second transistors to conduct to discharge said capacitor thereby to produce in said one circuit means, the associated said electrical signal having a sawtoothed waveform and having a frequency inversely proportional to he magnitude of the input voltage.

Claim 6

A system for deriving a product or a quotient of first and second electrical quantities, comprising first circuit means for converting said first electrical quantity into a first periodic electrical signal having a repetition rate corresponding to the magnitude of the first electrical quantity, second circuit means for converting said second electrical quantity into a second periodic electrical signal having a repetition rate corresponding to the magnitude of the second electrical quantity, and counter means connected to both said first and second circuit means for counting the number of one of said first and second electrical signals appearing during at least one period of the other electrical signal, wherein at least one of said first and second circuit means comprises a first transistor, a capacitor and input voltage means connected in series circuit relationship across the base and emitter electrodes of said first transistor, wherein said input voltage means is connected for reversely biasing Said first transistor, a second transistor having a pair of principal conducting electrodes connected in parallel with said capacitor and having a control electrode connected for biasing said second transistor into conduction in response to a conductive state of said first transistor, a resistor connected in series with said capacitor, and means for applying across said capacitor and resistor a constant voltage reverse in polarity from saidinput voltage means, wherein a charged voltage on said capacitor in excess of an input voltage of said input voltage means causes said first and second transistors to conduct to discharge said capacitor thereby to produce in said one circuit means, the associated said electrical signal having a sawtoothed waveform and having a frequency inversely proportional to he magnitude of the input voltage.

Claim 7

A system for deriving a product or a quotient of first and second electrical quantities comprising first circuit means for converting said first electrical quantity into a first periodic electrical signal having a repetition rate corresponding to the magnitude of the first electrical quantity, a second circuit means for converting said second electrical quantity into a second periodic electrical signal having a repetition rate corresponding to the magnitude of the second electrical quantity, and counter means connected to both said first and second circuit means for counting the number of one of said first and second electrical signals appearing during at least one period of the other electrical signal, wherein at least one of said first and second circuit means comprises a first transistor having an output electrode, a capacitor and a source of constant voltage connected in series circuit relationship across the base and emitter electrodes of said fist transistor, wherein said source is connected for reversely biasing said first transistor, a second transistor having an output electrode and having a control electrode connected to said output electrode of said first transistor, a third transistor having a control electrode connected to said output electrode of said second transistor and having a pair of principal conducting electrodes connected across said capacitor, and input voltage means having a voltage which is reverse in polarity from said constant voltage connected for providing a charged voltage on said capacitor in excess of said constant voltage for causing said first, second and third transistors to conduct to discharge said capacitor thereby to produce at said output electrode of said second transistor a pulsed signal having a pulse repetition rate proportional to the magnitude of the input voltage.

Claim 8

A system for deriving a product or a quotient of first and second electrical quantities comprising first circuit means for converting said first electrical quantity into a first periodic electrical signal having a repetition rate corresponding to the magnitude of the first electrical quantity, a second circuit means for converting said second electrical quantity into a second periodic electrical signal having a repetition rate corresponding to the magnitude of the second electrical quantity, and counter means connected to both said first and second circuit means for counting the number of one of said first and second electrical signals appearing during at least one period of the other electrical signal, wherein at least one of said first and second circuit means comprises a first transistor having an output electrode, a capacitor and a source of constant voltage connected in series circuit relationship across the base and emitter electrodes of said fist transistor, wherein said source is connected for reversely biasing said first transistor, a second transistor having an output electrode and having a control electrode connected to said output electrode of said first transistor, a third transistor having a control electrode connected to said output electrode of said second transistor and having a pair of principal conducting electrodes connected across said capacitor, and input voltage means having a voltage which is reverse in polarity from said constant voltage connected for providing a charged voltage on said capacitor in excess of said constant voltage for causing said first, second and third transistors to conduct to discharge said capacitor thereby to produce at said output electrode of said second transistor a pulsed signal having a pulse repetition rate proportional to the magnitude of the input voltage.

Claim 9

A system for deriving a product or a quotient of first and second electrical quantities comprising first circuit means for converting said first electrical quantity into a first periodic electrical signal having a repetition rate corresponding to the magnitude of the first electrical quantity, second circuit means for converting said second electrical quantity into a second periodic electrical signal having a repetition rate corresponding to the magnitude of the second electrical quantity, and counter means connected to both said first and second circuit means for counting the number of one of said first and second electrical signals appearing during at least one period of the other electrical signal, wherein at least one of said first and second circuit means comprises a first transistor having an output electrode, a capacitor and an input voltage means connected in series circuit relationship across the base and emitter electrodes of said first transistor, wherein said input voltage means is connected for reversely biasing said first transistor, a second transistor having a control electrode connected to said output electrode of said first transistor and including an output electrode, a third transistor having a control electrode connected to said output electrode of said second transistor and having a pair of principal conducTing electrodes connected across said capacitor, and constant voltage means having a constant voltage reverse in polarity from said input voltage for providing a charged voltage on said capacitor in excess of said input voltage for causing said first, second and third transistors to conduct to discharge said capacitor thereby to produce at said output electrode of said second transistor a pulsed signal having a pulse repetition rate inversely proportional to the magnitude of the input voltage.

Claim 10

A system for deriving a product or a quotient of first and second electrical quantities comprising first circuit means for converting said first electrical quantity into a first periodic electrical signal having a repetition rate corresponding to the magnitude of the first electrical quantity, second circuit means for converting said second electrical quantity into a second periodic electrical signal having a repetition rate corresponding to the magnitude of the second electrical quantity, and counter means connected to both said first and second circuit means for counting the number of one of said first and second electrical signals appearing during at least one period of the other electrical signal, wherein at least one of said first and second circuit means comprises a first transistor having an output electrode, a capacitor and an input voltage means connected in series circuit relationship across the base and emitter electrodes of said first transistor, wherein said input voltage means is connected for reversely biasing said first transistor, a second transistor having a control electrode connected to said output electrode of said first transistor and including an output electrode, a third transistor having a control electrode connected to said output electrode of said second transistor and having a pair of principal conducTing electrodes connected across said capacitor, and constant voltage means having a constant voltage reverse in polarity from said input voltage for providing a charged voltage on said capacitor in excess of said input voltage for causing said first, second and third transistors to conduct to discharge said capacitor thereby to produce at said output electrode of said second transistor a pulsed signal having a pulse repetition rate inversely proportional to the magnitude of the input voltage.