Sound communication system

Claim 2

A multipurpose sound communication system comprising: first and second oscillators having first and second output leads, respectively, said first and second oscillators producing respective first and second periodic output signals on said first and second leads thereof which have magnitudes that are first and second different predetermined functions of time, respectively; first means having an input lead, said first means being constructed to broadcast audible sound when at least one signal of an audio frequency is impressed upon said first means input lead; and a selectively operable switch having at least one pole and at least first and second contacts; and second means connecting said switch pole to said first means input lead, said first and second output leads of said respective first and second oscillators being respectively connected to said first and second switch contacts, said switch pole being movable to a first position in which said pole engages the said first switch contact without engaging the said second switch contact, and to a second position in which said pole engages the said second switch contact without engaging the said first switch contact, said third oscillator third output signal being on audio frequency signal, said second means including a third oscillator having a third output lead and a control input, said control input being connected from said switch pole, said third oscillator being constructed to produce a third periodic audio output signal on said third output lead of a frequency that is a third predetermined function of and variable with the magnitude of a signal impressed upon said control input thereto, said third oscillator output lead being connected to said first means input lead.

Claim 3

A multipurpose communication system comprising: a signal source having an output signal of an audio frequency at least a portion of the time, said signal source having an output lead, said signal source providing said output signal thereof on said output lead thereof; a first switch having at least one pole and at least first and second contacts, said first switch first contact being connected from the output lead of said signal source; a radio having an output lead, said radio including first means for producing an audio output signal on said radio output lead; second means connecting said radio output lead to said first switch second contact; a speaker assembly including an input therefor; third means having a first input lead connected from said first switch pole and an output connected to said speaker assembly input to provide an input signal to said speaker assembly, said third means having a second input lead; a second switch including a pole and at least one contact, said second switch pole being ganged with said first switch pole, said switch poles being movable both from a first position to a second position and from said second position to said first position wherein said second switch pole lies in engagement with said one contact thereof when said first switch pole lies in engagement with said first switch second contact and said poles are in said first position thereof, and wherein said second switch pole lies out of engagement with said one contact when said first switch pole lies in engagement with said first switch first contact and said poles are in said second position thereof, said second switch pole being connected from said speaker assembly, said one contact of said second switch being connected to the said second input lead of said third means, the construction of said speaker assembly and its connections and the construction of said third means and its connections causing negative feedback to be supplied to said third means over said second input lead theReto when said switch poles are in said first position thereof.

Claim 4

A multipurpose communication system comprising: a signal source having an output signal of an audio frequency at least a portion of the time, said signal source having an output lead, said signal source providing said output signal thereof on said output lead thereof; a first switch having at least one pole and at least first and second contacts, said first switch first contact being connected from the output lead of said signal source; a radio having an output lead, said radio including first means for producing an audio output signal on said radio output lead; second means connecting said radio output lead to said first switch second contact; a speaker assembly including an input therefor; third means having a first input lead connected from said first switch pole and an output connected to said speaker assembly input to provide an input signal to said speaker assembly, said third means having a second input lead; a second switch including a pole and at least one contact, said second switch pole being ganged with said first switch pole, said switch poles being movable both from a first position to a second position and from said second position to said first position wherein said second switch pole lies in engagement with said one contact thereof when said first switch pole lies in engagement with said first switch second contact and said poles are in said first position thereof, and wherein said second switch pole lies out of engagement with said one contact when said first switch pole lies in engagement with said first switch first contact and said poles are in said second position thereof, said second switch pole being connected from said speaker assembly, said one contact of said second switch being connected to the said second input lead of said third means, the construction of said speaker assembly and its connections and the construction of said third means and its connections causing negative feedback to be supplied to said third means over said second input lead theReto when said switch poles are in said first position thereof.

Claim 5

A multipurpose communication system comprising: a signal source having an output signal of an audio frequency at least a portion of the time, said signal source having an output lead, said signal source providing said output signal thereof on said output lead thereof; a first switch having at least one pole and at least first and second contacts, said first switch first contact being connected from the output lead of said signal source; a radio having an output lead, said radio including first means for producing an audio output signal on said radio output lead; second means connecting said radio output lead to said first switch second contact; a speaker assembly including an input therefor; third means having a first input lead connected from said first switch pole and an output connected to said speaker assembly input to provide an input signal to said speaker assembly, said third means having a second input lead; a second switch including a pole and at least one contact, said second switch pole being ganged with said first switch pole, said switch poles being movable both from a first position to a second position and from said second position to said first position wherein said second switch pole lies in engagement with said one contact thereof when said first switch pole lies in engagement with said first switch second contact and said poles are in said first position thereof, and wherein said second switch pole lies out of engagement with said one contact when said first switch pole lies in engagement with said first switch first contact and said poles are in said second position thereof, said second switch pole being connected from said speaker assembly, said one contact of said second switch being connected to the said second input lead of said third means, the construction of said speakers assembly and its connections and the construction of said third means and its connections causing negative feedback to be supplied to said third means over said second input lead thereto when said switch poles are in said first position thereof; and a microphone, a double-pole, single-throw switch having third and fourth poles engageable with third and fourth contacts, respectively, said third and fourth poles engaging said third and fourth contacts at the same time and disengaging them at the same time, a D.C. voltage source, said third pole being connected from said D.C. voltage source, said microphone having one side connected to said third contact, means connecting said fourth pole to said third means first input lead, said fourth contact being connected from said speaker assembly, fourth means connecting said signal source output lead to the other side of said microphone.

Claim 6

A multipurpose communication system comprising: a signal source having an output signal of an audio frequency at least a portion of the time, said signal source having an output lead, said signal source providing said output signal thereof on said output lead thereof; a first switch having at least one pole and at least first and second contacts, said first switch first contact being connected from the output lead of said signal source; a radio having an output lead, said radio including first means for producing an audio output signal on said radio output lead; second means connecting said radio output lead to said first switch second contact; a speaker assembly including an input therefor; third means having a first input lead connected from said first switch pole and an output connected to said speaker assembly input to provide an input signal to said speaker assembly, said third means having a second input lead; a second switch including a pole and at least one contact, said second switch pole being ganged with said first switch pole, said switch poles being movable both from a first position to a second position and from said second position to said first position wherein said second switch pole lies in engagement with said one contact thereof when said first switch pole lies in engagement with said first switch second contact and said poles are in said first position thereof, and wherein said second switch pole lies out of engagement with said one contact when said first switch pole lies in engagement with said first switch first contact and said poles are in said second position thereof, said second switch pole being connected from said speaker assembly, said one contact of said second switch being connected to the said second input lead of said third means, the construction of said speakers assembly and its connections and the construction of said third means and its connections causing negative feedback to be supplied to said third means over said second input lead thereto when said switch poles are in said first position thereof; and a microphone, a double-pole, single-throw switch having third and fourth poles engageable with third and fourth contacts, respectively, said third and fourth poles engaging said third and fourth contacts at the same time and disengaging them at the same time, a D.C. voltage source, said third pole being connected from said D.C. voltage source, said microphone having one side connected to said third contact, means connecting said fourth pole to said third means first input lead, said fourth contact being connected from said speaker assembly, fourth means connecting said signal source output lead to the other side of said microphone.

Claim 7

The invention as defined in claim 3, wherein said fourth means includes a potentiometer having a winding with first and second ends and a wiper, said fourth means also including a first resistor, said winding having its first end connected to said other end of said microphone and its second end connected to a point of fixed reference potential more negative than that of said one end of said microphone, said first resistor being connected from said signal source output lead to said wiper.

Claim 8

The invention as defined in claim 4, including a power switch actuable to disconnect said microphone from said D.C. voltage source by interrupting the circuit to said third pole, said power switch being ganged with said potentiometer, said second means including a resistor.

Claim 9

The invention as defined in claim 5, wherein said speaker assembly includes a speaker having first and second leads, said third means including amplifier means and a transformer having primary and secondary windings, said amplifier means having an output lead, said secondary winding being connected to said speaker assembly, one end of said primary winding being connected from the output lead of said amplifier means, said third means including driver means connecting said seconDary winding to said speaker assembly input, said second switch pole being connected from said first speaker lead.

Claim 10

A multipurpose communication system comprising: a signal source having an output signal of an audio frequency at least a portion of the time, said signal source having an output lead, said signal source providing said output signal thereof on said output lead thereof; a first switch having at least one pole and at least first and second contacts, said first switch first contact being connected from the output lead of said signal source; a radio having an output lead, said radio including first means for producing an audio output signal on said radio output lead; second means connecting said radio output lead to said first switch second contact; a speaker assembly including an input therefor; third means having a first input lead connected from said first switch pole and an output connected to said speaker assembly input to provide an input signal to said speaker assembly, said third means having a second input lead; a second switch including a pole and at least one contact, said second switch pole being ganged with said first switch pole, said switch poles being movable both from a first position to a second position and from said second position to said first position wherein said second switch pole lies in engagement with said one contact thereof when said first switch pole lies in engagement with said first switch second contact and said poles are in said first position thereof, and wherein said second switch pole lies out of engagement with said one contact when said first switch pole lies in engagement with said first switch first contact and said poles are in said second position thereof, said second switch pole being connected from said speaker assembly, said one contact of said second switch being connected to the said second input lead of said third means, the construction of said speaker assembly and its connections and the construction of said third means and its connections causing negative feedback to be supplied to said third means over said second input lead thereto when said switch poles are in said first position thereof, said speaker assembly including a speaker having first and second leads, said third means including amplifier means and a transformer having primary and secondary windings, said amplifier means having an output lead, said secondary winding being connected to said speaker assembly, one end of said primary winding being connected from the output lead of said amplifier means, said third means including driver means connecting said secondary winding to said speaker assembly input, said second switch pole being connected from said first speaker lead.

Claim 11

A multipurpose communication system comprising: a signal source having an output signal of an audio frequency at least a portion of the time, said signal source having an output lead, said signal source providing said output signal thereof on said output lead thereof; a first switch having at least one pole and at least first and second contacts, said first switch first contact being connected from the output lead of said signal source; a radio having an output lead, said radio including first means for producing an audio output signal on said radio output lead; second means connecting said radio output lead to said first switch second contact; a speaker assembly including an input therefor; third means having a first input lead connected from said first switch pole and an output connected to said speaker assembly input to provide an input signal to said speaker assembly, said third means having a second input lead; a second switch including a pole and at least one contact, said second switch pole being ganged with said first switch pole, said switch poles being movable both from a first position to a second position and from said second position to said first position wherein said second switch pole lies in engagement with said one contact thereof when said first switch pole lies in engagement with said first switch second contact and said poles are in said first position thereof, and wherein said second switch pole lies out of engagement with said one contact when said first switch pole lies in engagement with said first switch first contact and said poles are in said second position thereof, said second switch pole being connected from said speaker assembly, said one contact of said second switch being connected to the said second input lead of said third means, the construction of said speaker assembly and its connections and the construction of said third means and its connections causing negative feedback to be supplied to said third means over said second input lead thereto when said switch poles are in said first position thereof, said speaker assembly including a speaker having first and second leads, said third means including amplifier means and a transformer having primary and secondary windings, said amplifier means having an output lead, said secondary winding being connected to said speaker assembly, one end of said primary winding being connected from the output lead of said amplifier means, said third means including driver means connecting said secondary winding to said speaker assembly input, said second switch pole being connected from said first speaker lead.

Claim 12

The invention as defined in claim 2, wherein said second means includes a resistor.

Claim 13

A multipurpose sound communication system comprising: a signal source having an output signal of an audio frequency at least a portion of the time, said signal source having an output lead, said signal source providing said output signal thereof on said output lead thereof; a first switch having at least one pole and at least first and second contacts, said first switch first contact being connected from the output lead of said signal source; a radio having an output lead, said radio including first means for producing an audio output signal on said radio output lead; second means connecting said radio output lead to said first switch second contact; a speaker assembly including an input therefor; third means having a first input lead connected from said first switch pole and an output connected to said speaker assembly input to provide an input signal to said speaker assembly, said third means having a second input lead; a microphone; a double-pole, single-throw switch having second and third poles engageable with second and third contacts, respectively, said second and third poles engaging said second and third contacts at the same time and disengaging them at the same time; and a D.C. voltage soUrce, said second pole being connected from said D.C. voltage source, and microphone having one side connected from said second contact, fourth means connecting signal source output lead to the other side of said microphone, said third contact and said third pole being connected from said speaker assembly and to said third means second input, respectively, the construction of said speaker assembly and its connections and the construction of said third means and its connections causing negative feedback to be supplied to said third means over said second input lead thereto when said first switch pole is in engagement with said first switch second contact.

Claim 14

A multipurpose sound communication system comprising: a signal source having an output signal of an audio frequency at least a portion of the time, said signal source having an output lead, said signal source providing said output signal thereof on said output lead thereof; a first switch having at least one pole and at least first and second contacts, said first switch first contact being connected from the output lead of said signal source; a radio having an output lead, said radio including first means for producing an audio output signal on said radio output lead; second means connecting said radio output lead to said first switch second contact; a speaker assembly including an input therefor; third means having a first input lead connected from said first switch pole and an output connected to said speaker assembly input to provide an input signal to said speaker assembly, said third means having a second input lead; a microphone; a double-pole, single-throw switch having second and third poles engageable with second and third contacts, respectively, said second and third poles engaging said second and third contacts at the same time and disengaging them at the same time; and a D.C. voltage soUrce, said second pole being connected from said D.C. voltage source, and microphone having one side connected from said second contact, fourth means connecting signal source output lead to the other side of said microphone, said third contact and said third pole being connected from said speaker assembly and to said third means second input, respectively, the construction of said speaker assembly and its connections and the construction of said third means and its connections causing negative feedback to be supplied to said third means over said second input lead thereto when said first switch pole is in engagement with said first switch second contact.

Claim 15

The invention as defined in claim 9, wherein said fourth means includes a potentiometer having a winding with first and second ends and a wiper, said fourth means also including a resistor, said winding having its first end connected to said other microphone end and its second end connected to a point of fixed reference potential more negative than that of the said one end of said microphone, said resistor being connected from said signal source output lead to said wiper.

Claim 16

The invention as defined in claim 10, including a power switch actuable to disconnect said microphone from said D.C. voltage source by interrupting the circuit to said second pole, said power switch being ganged with said potentiometer.

Claim 17

The invention as defined in claim 11, wherein said speaker assembly includes a speaker having first and second leads, said third means including amplifier means and a transformer having primary and secondary windings, said amplifier means having an output lead, said secondary winding being connected to said speaker assembly, one end of said primary winding being connected from the output lead of said amplifier means, said third means including driver means connecting said secondary winding to said speaker assembly input.

Claim 18

The invention as defined in claim 9, wherein said speaker assembly includes a speaker having first and second leads, said third means including amplifier means and a transformer having primary and secondary windings, said amplifier means having an output lead, said secondary winding being connected to said speaker assembly, one end of said primary winding being connected from the output lead of said amplifier means, said third means including driven means connecting said secondary winding to said speaker assembly input.

Claim 19

A sound communication system comprising: a power supply having at least first and second output junctions; a manual control circuit and a manually operable first switch connected in series from said power supply second junction to said power supply first junction, said manual control circuit having a first junction, said first switch being manually movable to a closed position from an open position, and vice versa, said manual control circuit being actuable by manual movement of said first switch to one of said positions thereof to produce an increasng ramp voltage at said manual control circuit first junction at least during a portion of the time immediately succeeding the time that said first switch is moved to said one position thereof, said manual control circuit being deactuable by manual movement of said first switch to the other of said positions thereof to produce a decreasing ramp voltage at said manual control circuit first junction at least during a portion of the time immediately succeeding the time that said first switch is moved to said other position thereof; a voltage controlled oscillator having an input lead and an output lead; first means connecting said manual control circuit first junction to said voltage controlled oscillator input lead; and second means connected from said voltage controlled oscillator output lead for producing an audible sound which has a frequency spectrum that is the same as that which appears at the output of said voltage controlled oscillator.

Claim 20

A sound communication system comprising: a power supply having at least first and second output junctions; a manual control circuit and a manually operable first switch connected in series from said power supply second junction to said power supply first junction, said manual control circuit having a first junction, said first switch being manually movable to a closed position from an open position, and vice versa, said manual control circuit being actuable by manual movement of said first switch to one of said positions thereof to produce an increasng ramp voltage at said manual control circuit first junction at least during a portion of the time immediately succeeding the time that said first switch is moved to said one position thereof, said manual control circuit being deactuable by manual movement of said first switch to the other of said positions thereof to produce a decreasing ramp voltage at said manual control circuit first junction at least during a portion of the time immediately succeeding the time that said first switch is moved to said other position thereof; a voltage controlled oscillator having an input lead and an output lead; first means connecting said manual control circuit first junction to said voltage controlled oscillator input lead; and second means connected from said voltage controlled oscillator output lead for producing an audible sound which has a frequency spectrum that is the same as that which appears at the output of said voltage controlled oscillator.

Claim 21

The invention as defined in claim 14, wherein said first means inclUdes an automatically deactuable electronic switch responsive to the voltage on said manual control circuit first junction for disconnecting said manual control circuit first junction from said voltage controlled oscillator input lead when said decreasing ramp voltage falls to a predetermined level.

Claim 22

The invention as defined in claim 14, wherein said manual control circuit includes a second junction, a first resistor connected between said power supply first output junction and said second junction, an auxiliary resistor connected from said second junction to said power supply second output junction; a diode connected between said manual control circuit second junction and said manual control circuit first junction, a second resistor and a first capacitor connected in parallel from said manual control circuit first junction to said power supply second output junction, and a third resistor connected from said first switch to said manual control circuit first junction, said first switch and said third resistor being connected in series from said power supply first output junction.

Claim 23

The invention as defined in claim 16, wherein said first means includes a first transistor having a collector, an emitter and a base, said first transistor emitter being connected from said manual control circuit first junction, a fourth resistor connected from said second junction to said first transistor base, and a fifth resistor connected from said transistor collector to said voltage controlled oscillator input lead.

Claim 24

The invention as defined in claim 17, wherein said power supply, when energized, produces first and second D.C. potentials at said first and second output junctions thereof, respectively, said first D.C. potential being positive with respect to said second D.C. potential, said diode having an anode connected from said second junction, and a cathode connected to said manual control circuit first junction, said first transistor being of the PNP conductivity type.

Claim 25

The invention as defined in claim 18, wherein said voltage controlled oscillator includes a differential amplifier, a unijunction transistor, second and third capacitors, and sixth and seventh resistors, said amplifier having inverting and noninverting input leads, and an output lead, said unijunction transistor having an emitter, and first and second bases, said power supply having a third output junction of a potential which is equal to one-half the sum of the potentials of said first and second power supply junctions, the noninverting input lead to said amplifier being connected from said power supply third output function, said fifth resistor being connected from said first transistor collector to said amplifier inverting input lead, said seventh resistor and said second capacitor being connected in series from said amplifier output lead to said second means, said third capacitor being connected between said amplifier inverting input and output leads, said unijunction transistor first base and emitter being connected from said amplifier inverting input and output leads, respectively, said sixth resistor being connected from said power supply first output junction to said unijunction transistor second base.