SPREAD SPECTRUM TRANSMITTER

摘要

PURPOSE:To attain a transmitter with simple constitution by using an information signal to change an oscillated frequency of a voltage controlled oscillator and using the oscillating signal as a clock generating pseudo noise from a pseudo noise generator and applying spread spectrum with the oscillation signal and the pseudo noise for transmission. CONSTITUTION:An information signal (a) desired to be transmitted is inputted to the voltage controlled oscillator 21 to generate an oscillating signal (b) and the signal is subject to frequency division by a frequency dividing ratio required by the frequency divider 22. The output (c) is used as a clock to generate a pseudo noise (d) from a pseudo noise generator 2. Then the output (b) of the oscillator 11 is modulated by a modulator 5 by using the noise (d) so as to apply spread spectrum, and the result is outputted to a lighting line through a coupler 6 and transmitted to the reception side. The oscillating signal and the pseudo noise apply spread spectrum and transmit the result in this way allowing to eliminate the need for a synchronous pseudo noise generator and simplifying the constitution.