FIELD: physics, communication.
SUBSTANCE: invention is related to methods and devices of modulation, which correspond to law of Federal Communications Committee (FCC), implemented in 2005, without application of linear power amplifier. Coder codes sound and similar data to generate binary signal. Transformation device transforms binary signal into tetradic symbol and deduces tetradic symbol. Filter of the main frequency band includes filter with root characteristic from raised cosine and filter with sine characteristic. Filter of the main frequency band blocks previously determined frequency component of symbol, for symbol transformation into oscillating signal, and deduces generated oscillating signal. Device for modulation transmits signal exposed to FM modulation in compliance with value of oscillating signal amplitude, into receiving device. When symbol having maximum absolute value (±3) is deduced from transformation device, frequency shift of signal transmitted from FM modulator has previously defined value in the range from ±0.822 kHz to ±0.952 kHz.
EFFECT: development of modulation device without application of linear power amplifier.
11 cl, 19 dwg, 11 tbl
