A radio frequency digital modulation method based on dds and dsp
A modulation method and radio frequency technology, applied in the direction of angle modulation components, etc., to achieve the effects of wide frequency band coverage, elimination of group delay, and low power consumption
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[0025] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0026] Such as figure 1 As shown, the system or device corresponding to or used to realize the radio frequency digital modulation method of the present invention includes an audio amplification part, an audio sampling A / D converter part, a DSP operation and a preset DDS frequency control word part, and a DDS modulator part , low-noise phase-locked loop part, etc., wherein the audio sampling A / D converter includes FIR / IIR filter and interpolation / decimation filter.
[0027] Specifically, such as figure 2 As shown, the audio amplification part adopts an audio amplifier chip with voice compression, which is used to amplify the audio signal to be modulated to a certain amplitude. For FM, the frequency offset f of the modulated signal 频偏 With the amplitude of the audio signal V 音频 , and the general FM signal has a maximum frequency deviation f 频偏MAX req...
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