Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1977-02-08
1979-06-26
Safourek, Benedict V.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
325142, 332 9R, 340167R, H03K 708
Patent
active
041594487
ABSTRACT:
A pulse modulation system in which both ends of the pulses of a train can be modulated in time relative to time marker signals, permits establishment of a four-channel, time division, duplex communication system on a single radio frequency carrier. The modulation technique permits pulse width modulation of signals whose band width exceeds the pulse repetition rate.
Such a system can provide relatively narrow band, low noise, communication, and it is applicable to transmission and reception of high quality stereo signals. Moreover, it can provide private, secure radio communication between two stations, one of which transmits a train of pulses one edge of each of which is unmodulated to form time marker signals. The formation of the other edge of the pulses of the train is modulated in time with some variable information, or data, but only if the pulse train received from the other station has one edge of its pulses modulated with an identification signal. The other edge of the pulses of that other station may be modulated in time or width with variable information.
A practical application of such a communications system is illustrated in a cordless telephone using transceivers using a modulator, demodulator, and amplifier circuitry according to the invention. A second application is illustrated showing how the invention is used to transmit pulse modulated signals whose band width exceeds the pulse repetition rate.
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Frater Grover A.
Rath Western Corporation
Safourek Benedict V.
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