| 摘要 |
PURPOSE:To attain spread spectrum communication by combining a frequency signal and a signal being the result of FM modulation of voice in a device comprising the combination of a multiplier and an adder. CONSTITUTION:A cosine signal oscillated by an oscillator 1 and a cosine and sine signal generated from a hopping frequency generating means 2 by a hopping command are multiplied respectively by a 1st multiplier 7 and a 2nd multiplier 8 respectively. The sine and cosine signal generated from the hopping frequency generation means 2 by the hopping command is multiplied respectively by 3rd and 4th multipliers 10, 11. The signals multiplied by the 5th-8th multipliers 12, 13, 14, 15 are added by an analog adder 16. However, the output of the multiplier 14 is added by a coefficient device 17 after being multiplied by -1. That is, the output of the adder 16 is the combination of frequency hopping and carrier FM. |
