| 摘要 |
PURPOSE:To contrive attainment of light weight and miniaturization of the titled equipment by selecting any of plural series of pseudo random numbers in response to a transmission data and applying frequency deviation modulation to a signal according to the selected data, thereby transmitting the result and using the transmitter as a nonlinear amplifier. CONSTITUTION:The transmission side is provided with plural pseudo random number generating means 3a-3d generating a pseudo random number of different orthogonal code series, a selector switch 21 selecting any of outputs of the pseudo random number generating means in response to the sent data 2, and a frequency deviation modulation means 22 applying frequency deviation modulation to the output to attain frequency spread. The receiver side is provided with plural pseudo random number generating means 23a-23d, plural frequency deviation modulation means 24a-24d applying frequency deviation modulation to the output, plural mixture means 25a-25d mixing the output signal of the modulation means with a reception signal to apply inverse split to the reception signal, and a discriminating means 27 selecting a signal having high correlativity among the outputs of the mixing means and demodulating it. Thus, the spread spectrum of the frequency modulation system is attained and weight, heating, and power consumption of the transmitter are reduced while using it as a nonlinear amplifier. |
