Walkie-talkie device

• US 3,939,418 A
• Filed: 10/07/1974
• Issued: 02/17/1976
• Est. Priority Date: 10/07/1974
• Status: Expired due to Term

• Current Assignee: Marvin Glass & Associates
• Original Assignee: Marvin Glass & Associates
• Inventors: Morrison, Howard J., Keller, Albert G.
• Primary Examiner(s): Mayer, Albert J.
• Application Number:
  US05/512,553
• Time in Patent Office: 498 Days
• Field of Search: 325/16, 325/18-20, 325/21, 325/22
• US Class Current: 455/84
• CPC Class Codes: H04B 1/38 Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving

Abstract

A walkie-talkie unit having a speaker connected to a radio transceiver for normal transmitting and receiving functions, plus a selectively actuatable audio signal generator. The generator generates one of a plurality of distinct signals of different frequency in response to a hand manipulatable actuator. When the walkie-talkie is in a transmitting mode the signal is transmitted to another walkie-talkie. When the walkie-talkie is in a receiving mode the signal is amplified by the generating walkie-talkie.

Claims

1. In a walkie-talkie unit including a microphone/speaker connected to a radio transceiver including an RF source, a power supply, a modulator, an audio amplifier, an antenna, a detector for transmitting and receiving audio signals and switch means for selectively operating in either a transmit or receive mode, the improvement comprising:

a selectively actuatable audio signal generator connected to said transceiver for generating an audio signal of at least one frequency for transmission to another walkie-talkie when in a transmitting mode as well as generating sound from its speaker when in a receiving mode; and

a hand manipulatable actuator to selectively actuate said signal generator in either of said modes.

2. The walkie-talkie unit of claim 1 wherein said signal generator comprises at least one electronic oscillator.

3. The walkie-talkie unit of claim 1 wherein said walkie-talkie includes a housing with a cover member pivotally mounted on said housing over said speaker, said cover member being movable from a normally shut position to an open position in response to the manipulation of the actuator.

4. The walkie-talkie unit of claim 2 wherein the electronic oscillator is a relaxation oscillator including at least one capacitor and one resistor connected to the power supply and at least one transistor to cyclically discharge the capacitator to produce the audio frequency signal.

5. The walkie-talkie unit of claim 11 wherein said oscillator includes at least one unijunction transistor.

6. The walkie-talkie unit of claim 2 wherein said signal generator comprises a pair of electronic oscillators connected in parallel across the power source to interact with one another when actuated to generate a warbling audio frequency signal.

10. The walkie-talkie unit of claim 6 wherein the electronic oscillator is a relaxation oscillator including at least two capacitors and two resistors connected to the power supply and at least two transistors to cyclically discharge the capacitors to produce the audio frequency signal.

11. The walkie-talkie unit of claim 10 wherein said oscillator includes a plurality of unijunction transistors.

12. The walkie-talkie unit of claim 10 wherein said actuator includes switch means connected to said oscillator and a resistor for selectively producing a signal of a different frequency.

13. The walkie-talkie unit of claim 12 wherein said oscillator includes a pair of resistors of different values connected in parallel to one of said transistors, and said switch means is connected to said transistors and resistors for selectively adding one of the parallel resistors to the circuit to vary the frequency of said one transistor.

7. In a walkie-talkie unit including a microphone/speaker connected to a radio transceiver including an RF source, a power supply, a modulator, an audio amplifier, an antenna, a detector for transmitting and receiving audio signals and switch means for selectively operating in either a transmit or receive mode, the improvement comprising:

a selectively actuatable signal generator connected to said transceiver for generating one of a plurality of distinct signals of different frequency for transmitting a signal of one frequency to another walkie-talkie when in a transmitting mode and generating a signal of another frequency from the speaker when in a receiving mode; and

a hand manipulatable actuator to selectively actuate said signal generator for generating one of the frequencies.

8. The walkie-talkie unit of claim 7 wherein said signal generator is a multifrequency electronic oscillator.

9. The walkie-talkie unit of claim 7 wherein said walkie-talkie includes a housing with a cover pivotally mounted over said speaker, said cover being movable from a normally shut position to an open position in response to manipulation of the actuator.

14. The walkie-talkie unit of claim 8 wherein said signal generator comprises a pair of electronic oscillators connected in parallel across the power source to interact with one another when actuated to generate a warbling audio frequency signal.