Remote voice-controlled system of unmanned smoke generator devices

A system for remote control operation from a command location of an unmanned smoke generation machine positioned at a location remote from said command location said system comprising:

• a transmission means at the command location for transmitting signals in the band of frequencies between RF and UHF to said remote location, said transmission means comprising a tone generator device for generating a particular acoustic DTMF tone binary coded decimal output signal, and a first microphone means for converting such DTMF tone signal into DTMF pulses which can be transmitted as first signals by said transmission means, said first microphone means also accepting human voice sounds which can be transmitted as second signals at a predetermined frequency by said transmission means;
• wherein said first and said second signals can be simultaneously transmitted;
• receiving means at the remote location for receiving and detecting said first and second signals, said receiving means comprising a speaker means for producing audible sounds in response to said signals being received by said receiving means, a second microphone means acoustically coupled to said speaker means for converting said audible sounds into third signals, a decoder-driver means for receiving said third signals and generating a fourth signal when a particular DTMF tone signal is detected within said third signals, a latch-transistor means for generating a steady-on electrical signal in response to receipt of said fourth signal from said decoder-driver means, for closing a relay means selectively supplying or discontinuing connection of a high voltage power to said smoke generation machine in response to said steady-on signal from said latch-transistor means,
• whereby said receiving means can receive both said human voice sounds and said DTMF pulses transmitted from said command location transmission means.