Transmitter with means for generating the carrier wave before generating the modulation components

Claim 2

In a transmitter having a carrier-wave-generating circuit and an information-generating circuit and a modulator for modulating the carrier wave in accordance with the information, the combination comprising electronic first switching means having a transmitter-energized position for coupling a source of operating voltage to the carrier wave generating circuit, second switching means coupled to said first switching means and having a first position to couple a voltage thereto for placement thereof in its transmitter-energized position and having a second position to isolate the voltage from said first switching means, a control circuit operatively coupled to said second switching means and responsive to the placement thereof in said first position and thereafter in said second position to provide energizing signals, said information-generating circuit being coupled to the output of said control circuit and being responsive to the application thereto of the energizing signals to generate information for modulation on said carrier wave, and a holding circuit operatively coupled to said control circuit and to said first switching means and responsive to the application of the energizing signals to maintain said first switching means in its transmitter-energized position despite said second switching means being in its second position, whereby movement of said second switching means to its first position causes said carrierwave-generating circuit to generate said carrier wave and the subsequent movement of said second switching means to said second position causes said information-generating circuit to generate said information.

Claim 3

In the transmitter set forth in claim 1, wherein said electronic first switching means is a relay having a winding coupled to said second switching means and a pair of contacts respectively coupled to the source of operating voltage and the carrier-wave-generating circuit, the transmitter energized position occurring when said contacts are closed.

Claim 4

In the transmitter set forth in claim 1, wherein said second switching means is manually operable.

Claim 5

In the transmitter set forth in claim 1, wherein said second switching means is closed in said first position and is open in said second position.

Claim 6

In the transmitter set forth in claim 1, wherein said second switching means is manually operable and is spring loaded to said second position.

Claim 7

In the transmitter set forth in claim 1, wherein said control circuit is electrically coupled to said second switching means.

Claim 8

In the transmitter set forth in claim 1, wherein said holding circuit is electrically coupled to said control circuit.

Claim 9

In the transmitter set forth in claim 1, wherein said control circuit includes a capacitor, charging means coupled from said second switching means to said capacitor for rapid charge thereof when said second switching means is placed in said first position and then in second position, discharge means coupled to said capacitor for slow discharge thereof while said second switching means is in its second position, and an electronic switch coupled to said capacitor and responsive to the rapid charge and slow discharge thereof to provide energizing pulses.

Claim 10

A transmitter comprising a carrier wave generating circuit, a first tone-generating circuit for generating a first control tone having a given frequency, a second tone-generating circuit for generating a second control tone having a different frequency, a modulator coupled to said tone-generating circuits and to said carrier wave generating circuit for modulating the carrier wave in accordance with the control tones, electronic first switching meAns having a transmitter energized position for coupling a source of operating voltage to said carrier wave generating circuit, second switching means coupled to said first switching means and having a first position to couple a voltage thereto for placement thereof in its transmitter energized position and having a second position to isolate the voltage from said first switching means, a first pulse generator operatively coupled to said second switching means and responsive to the placement thereof in its first position and thereafter in the second position to provide a first pulse having a first predetermined duration, said first tone-generating circuit being coupled to the output of said first pulse generator and being responsive to the application thereto of said first pulse for generating said first control tone for said first predetermined duration, a second pulse generator coupled to the output of said first tone control circuit and responsive to the termination of said first pulse to provide a second pulse of a second predetermined duration, said second tone-generating circuit being coupled to the output of said second pulse generator and being responsive to the application thereto of said second pulse for generating said second control tone for said second predetermined duration, and a holding circuit operatively coupled to said pulse generators and to said first switching means and operative in the presence of said pulses to maintain said first switching means in its transmitter energized position despite said second switching means being in its second position, whereby movement of said second switching means to its first position causes said carrier-wave-generating circuit to generate said carrier wave and the subsequent movement of said second switching means to its second position causes said first and second tone-generating circuits respectively to generate said first control tone followed substantially immediately by said second control tone.

Claim 11

A transmitter comprising a carrier wave generating circuit, a first tone-generating circuit for generating a first control tone having a given frequency, a second tone-generating circuit for generating a second control tone having a different frequency, a modulator coupled to said tone-generating circuits and to said carrier wave generating circuit for modulating the carrier wave in accordance with the control tones, electronic first switching meAns having a transmitter energized position for coupling a source of operating voltage to said carrier wave generating circuit, second switching means coupled to said first switching means and having a first position to couple a voltage thereto for placement thereof in its transmitter energized position and having a second position to isolate the voltage from said first switching means, a first pulse generator operatively coupled to said second switching means and responsive to the placement thereof in its first position and thereafter in the second position to provide a first pulse having a first predetermined duration, said first tone-generating circuit being coupled to the output of said first pulse generator and being responsive to the application thereto of said first pulse for generating said first control tone for said first predetermined duration, a second pulse generator coupled to the output of said first tone control circuit and responsive to the termination of said first pulse to provide a second pulse of a second predetermined duration, said second tone-generating circuit being coupled to the output of said second pulse generator and being responsive to the application thereto of said second pulse for generating said second control tone for said second predetermined duration, and a holding circuit operatively coupled to said pulse generators and to said first switching means and operative in the presence of said pulses to maintain said first switching means in its transmitter energized position despite said second switching means being in its second position, whereby movement of said second switching means to its first position causes said carrier-wave-generating circuit to generate said carrier wave and the subsequent movement of said second switching means to its second position causes said first and second tone-generating circuits respectively to generate said first control tone followed substantially immediately by said second control tone.

Claim 12

The transmitter set forth in claim 9, wherein said carrier-wave-generating circuit includes an oscillator for applying a given frequency oscillatory signal to said modulator, a frequency multiplier circuit coupled to the output of said modulator for increasing the frequency of the modulated oscillatory signal, and an amplifier circuit for increasing the level of the higher frequency modulated oscillatory signal.

Claim 13

The transmitter set forth in claim 9, wherein each tone-generating circuit includes an oscillator portion and an amplifier portion, one of said portions of each of said tone-generating circuits being inoperative and respectively coupled to said pulse generators, whereby the provision of said first pulse causes said one portion in said first tone-generating circuit to become operative to cause said first control tone to be generated, and whereby the subsequent provision of said second pulse causes the corresponding portion of said second tone-generating circuit to become operative to cause said second control tone to be generated.

Claim 14

The transmitter set forth in claim 9, wherein said first pulse generator includes a first capacitor, first charging means coupled from said second switching means to said first capacitor for rapid charge thereof when said second switching means is placed in said first position and then in said second position, first discharge means coupled to said first capacitor for slow discharge thereof, while said second switching means is in its second position, and a first electronic switch coupled to said first capacitor and responsive to the rapid charge and slow discharge thereof to provide said first pulse, said second pulse generator including a second capacitor, second charging means coupled from the output of said first pulse generator to said capacitor for rapid charge thereof upon termination of said first pulse, and said second discharge means coupled to said second capacitor for slow discharge thereof, and a second electronic switch coupled to said second capacitor and respoNsive to the rapid charge and slow discharge thereof to provide said second pulse.

Claim 15

A transmitter comprising a carrier-wave-generating circuit, a first tone-generating circuit for generating a first control tone having a given frequency, a second tone-generating circuit for generating a second control tone having a different frequency, a modulator coupled to said tone-generating circuit and to said carrier-wave-generating circuit for modulating the carrier wave in accordance with the control tones, electronic first switching means having a transmitter-energized position for coupling a source of operating voltage to said carrier-wave-generating circuit to generate the carrier wave, second switching means coupled to said first switching means and having a first position to couple a voltage thereto for placement thereof in its transmitter-energized position and having a second position to isolate the voltage from said first switching means, a first pulse generator operatively coupled to said second switching means and responsive to the placement thereof in its first position and thereafter in its second position to provide a first pulse having a first predetermined duration, said first tone-generating circuit being coupled to the output of said first pulse generator and being responsive to the application thereto of said first pulse to said first tone-generating circuit for generating said first control tone for said first predetermined duration, a second pulse generator coupled to the output of said first tone control circuit and responsive to the termination of said first pulse to provide a second pulse of a second predetermined duration, said second tone-generating circuit being coupled to the output of said second pulse generator and being responsive to the application thereto of said second pulses for generating said second control tone for said second predetermined duration, a third pulse generator operatively coupled to said second switching means and responsive to the placement thereof in its first position and thereafter in its second position to provide a third pulse having a duration of at least about equal to the combined duration of said first and second pulses and commencing substantially with the commencement of said first pulse, and a holding circuit coupling the output of said third pulse generator to said first switching means and operative in the presence of said third pulse to maintain said first switching means in its transmitter-energized position despite said second switching means being in its second position, whereby movement of said second switching means to its first position causes said carrier-wave-generating circuit to generate said carrier wave and the subsequent movement of said second switching means to its second position causes said first and second tone-generating circuits respectively to generate said first control tone followed substantially immediately by said second control tone.

Claim 16

A transmitter comprising a carrier-wave-generating circuit, a first tone-generating circuit for generating a first control tone having a given frequency, a second tone-generating circuit for generating a second control tone having a different frequency, a modulator coupled to said tone-generating circuit and to said carrier-wave-generating circuit for modulating the carrier wave in accordance with the control tones, electronic first switching means having a transmitter-energized position for coupling a source of operating voltage to said carrier-wave-generating circuit to generate the carrier wave, second switching means coupled to said first switching means and having a first position to couple a voltage thereto for placement thereof in its transmitter-energized position and having a second position to isolate the voltage from said first switching means, a first pulse generator operatively coupled to said second switching means and responsive to the placement thereof in its first position and thereafter in its second position to provide a first pulse having a first predetermined duration, said first tone-generating circuit being coupled to the output of said first pulse generator and being responsive to the application thereto of said first pulse to said first tone-generating circuit for generating said first control tone for said first predetermined duration, a second pulse generator coupled to the output of said first tone control circuit and responsive to the termination of said first pulse to provide a second pulse of a second predetermined duration, said second tone-generating circuit being coupled to the output of said second pulse generator and being responsive to the application thereto of said second pulses for generating said second control tone for said second predetermined duration, a third pulse generator operatively coupled to said second switching means and responsive to the placement thereof in its first position and thereafter in its second position to provide a third pulse having a duration of at least about equal to the combined duration of said first and second pulses and commencing substantially with the commencement of said first pulse, and a holding circuit coupling the output of said third pulse generator to said first switching means and operative in the presence of said third pulse to maintain said first switching means in its transmitter-energized position despite said second switching means being in its second position, whereby movement of said second switching means to its first position causes said carrier-wave-generating circuit to generate said carrier wave and the subsequent movement of said second switching means to its second position causes said first and second tone-generating circuits respectively to generate said first control tone followed substantially immediately by said second control tone.

Claim 17

The transmitter set forth in claim 13, wherein each tone-generating circuit includes a normally inoperative oscillator portion and a normally inoperative amplifier portion, one of said portions in said first tone-generating circuit being coupled to said first pulse generator so as to become operative for the duration of said first pulse, the other portion in said first tone-generating circuit being coupled to the output of said third pulse generator to become operative for the duration of said third pulse, the portion in said second tone-generating circuit corresponding to said one portion being coupled to said second pulse generator so as to become operative for the duration of said second pulse, the other portion in said second tone-generating circuit being coupled to the output of said third pulse generator to become operative for the duration of said third pulse.

Claim 18

The transmitter set forth in claim 13, wherein each tone-generating circuit includes a normally inoperative oscillator portion and a normally inoperative amplifier portion, the amPlifier portion in said first tone-generating circuit being coupled to said first pulse generator so as to become operative for the duration of said first pulse, the amplifier portion in said second tone-generating circuit being coupled to the output of said second pulse generator to become operative for the duration of said second pulse, the oscillator portion in each of said tone-generating circuits being coupled to the output of said third pulse generator to become operative for the duration of said third pulse.

Claim 19

A transmitter comprising a carrier-wave-generating circuit, a microphone for converting sound applied thereto into audio signals, a tone-generating circuit for generating at least one control tone, an audio amplifier for receiving and amplifying the audio signals and the control tone, a modulator coupled to said audio amplifier and to the carrier-wave-generating circuit for modulating the carrier wave in accordance with the audio signals and the control tone, first electronic switching means including a first control element and a pair of first terminals respectively coupled to a source of operating voltage and to said carrier-wave-generating circuit, second electronic switching means including a second control element and a pair of second terminals coupled in series with said first control element and a current source, a first manually operable switch coupled in series with said second control element and a current source, whereby closure of said first manually operable switch couples current through said second control element electrically to connect said second terminals to cause current to flow through said first control element electrically to connect said first terminals and to cause the operating voltage to be supplied to said carrier-wave-generating circuit, a control circuit electrically coupled to the second mentioned of said first pair of terminals and responsive to said first manually operable switch being sequentially closed and then opened to provide energizing signals, said tone-generating circuit being coupled to the output of said control circuit and being responsive to the application thereto of the energizing signals to generate the control tone for modulation on said carrier wave, and a holding circuit coupled to said control circuit and to said first electronic switching means and responsive to the application of the energizing signals for maintaining said first electronic switching means in its transmitter-energized position despite said manually operable switch being opened, whereby movement of said first manually operable switch to its first position causes said carrier-wave-generating circuit to generate said carrier wave and the subsequent movement of said first manually operable switch to said second position causes said tone-generating circuit to generate said control tone, a second manually operable switch coupled in parallel with said pair of second terminals and having a closed position to cause current to flow through said first control element electrically to connect four of said first terminals to cause the operating voltage to be supplied to said carrier-wave-generating circuit, whereby closure of said second manually operable switch causes a carrier wave to be generated on which may be modulated audio signals induced in response to sounds applied to said microphone.

Claim 20

A transmitter comprising a carrier-wave-generating circuit, a microphone for converting sound applied thereto into audio signals, a tone-generating circuit for generating at least one control tone, an audio amplifier for receiving and amplifying the audio signals and the control tone, a modulator coupled to said audio amplifier and to the carrier-wave-generating circuit for modulating the carrier wave in accordance with the audio signals and the control tone, first electronic switching means including a first control element and a pair of first terminals respectively coupled to a source of operating voltage and to said carrier-wave-generating circuit, second electronic switching means including a second control element and a pair of second terminals coupled in series with said first control element and a current source, a first manually operable switch coupled in series with said second control element and a current source, whereby closure of said first manually operable switch couples current through said second control element electrically to connect said second terminals to cause current to flow through said first control element electrically to connect said first terminals and to cause the operating voltage to be supplied to said carrier-wave-generating circuit, a control circuit electrically coupled to the second mentioned of said first pair of terminals and responsive to said first manually operable switch being sequentially closed and then opened to provide energizing signals, said tone-generating circuit being coupled to the output of said control circuit and being responsive to the application thereto of the energizing signals to generate the control tone for modulation on said carrier wave, and a holding circuit coupled to said control circuit and to said first electronic switching means and responsive to the application of the energizing signals for maintaining said first electronic switching means in its transmitter-energized position despite said manually operable switch being opened, whereby movement of said first manually operable switch to its first position causes said carrier-wave-generating circuit to generate said carrier wave and the subsequent movement of said first manually operable switch to said second position causes said tone-generating circuit to generate said control tone, a second manually operable switch coupled in parallel with said pair of second terminals and having a closed position to cause current to flow through said first control element electrically to connect four of said first terminals to cause the operating voltage to be supplied to said carrier-wave-generating circuit, whereby closure of said second manually operable switch causes a carrier wave to be generated on which may be modulated audio signals induced in response to sounds applied to said microphone.

Claim 21

The transmitter set forth in claim 16, wherein each of said electronic switching means is a relay having a winding which corresponds to said control element and a pair of contacts which correspond to said pair of terminals.

Claim 22

The transmitter set forth in claim 16, wherein each of said manually operable switches is spring loaded to its open position.