Voice-modulated transponder system
First Claim
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1. A system for communicating between an interrogator and a transponder comprising:
- an interrogator including means for transmitting a pulse train signal, said transmitting means comprising means for modulating a pulse repetition frequency of its pulse train signal in accordance with a first voice type signal;
the transponder including means for receiving said pulse train signal and means responsive to said received pulse train signal for transmitting a pulse train signal having the same pulse repetition frequency and modulation thereof as said received pulse train signal, said transponder transmitting means comprising means for modulating the pulse width of its transmitted pulses in accordance with a second voice type signal;
said interrogator further including means for receiving signals transmitted by said transponder, means coupled to said interrogator receiving means and to said interrogator transmitting means for providing signals in response to the time elapsed between the transmission of a pulse signal by said interrogator and the reception of a pulse signal from said transponder, and means coupled to said interrogator receiving means for demodulating said pulse width modulation to recover said second voice type signal; and
said transponder further including means coupled to said transponder receiving means for demodulating said frequency modulation to recover said first voice type signal.
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Abstract
A voice-modulated transponder system comprising an interrogator and a light-weight transponder. In the described embodiment, the interrogator is airborne and the transponder is located on the ground. The interrogator can locate the position of the transponder and simultaneously therewith two-way voice communication between the interrogator and transponder is possible.
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Citations
7 Claims
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1. A system for communicating between an interrogator and a transponder comprising:
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an interrogator including means for transmitting a pulse train signal, said transmitting means comprising means for modulating a pulse repetition frequency of its pulse train signal in accordance with a first voice type signal; the transponder including means for receiving said pulse train signal and means responsive to said received pulse train signal for transmitting a pulse train signal having the same pulse repetition frequency and modulation thereof as said received pulse train signal, said transponder transmitting means comprising means for modulating the pulse width of its transmitted pulses in accordance with a second voice type signal; said interrogator further including means for receiving signals transmitted by said transponder, means coupled to said interrogator receiving means and to said interrogator transmitting means for providing signals in response to the time elapsed between the transmission of a pulse signal by said interrogator and the reception of a pulse signal from said transponder, and means coupled to said interrogator receiving means for demodulating said pulse width modulation to recover said second voice type signal; and said transponder further including means coupled to said transponder receiving means for demodulating said frequency modulation to recover said first voice type signal. - View Dependent Claims (2)
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3. A system for communicating between an interrogator and a transponder comprising:
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an interrogator including means for transmitting a pulse train signal at a first pulse repetition frequency, said transmitting means comprising means for modulating said pulse train signal with a first modulation in accordance with a first voice type signal; a transponder including means for receiving said pulse train signal, and means responsive to said received pulse train signal for transmitting a pulse train signal having the same pulse repetition frequency as said received pulse train signal, said transponder transmitting means comprising means for modulating its transmitted pulse train signal with a second modulation in accordance with a second voice type signal; said interrogator further including means for receiving signals transmitted by said transponder, means coupled to said interrogator receiving means and to said interrogator transmitting means for providing signals in response to the time elapsed between the transmission of a pulse signal by said interrogator and the reception of a pulse signal from said transponder, and means coupled to said interrogator receiving means for demodulating said second modulation to recover said second voice type signal; and said transponder further including means coupled to said transponder receiving means for demodulating said first modulation to recover said first voice type signal. - View Dependent Claims (4, 5, 6, 7)
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Specification