4results about "Pulse combined modulation" patented technology

The present application relates to a kind of multi-mode noise interference signal generation method, belong to signal interference technical field, solve the problem that existing cannot dynamically flexibly generate the interference signal of multiple modulation modes and the high development complexity.For method includes: according to noise kind and interference mode, obtain first noise sequence, second noise sequence, third noise sequence, noise interference bandwidth and center frequency;Carrier signal is generated based on center frequency;First noise sequence and noise interference bandwidth are passed into first multiplier, then the output result and carrier signal are passed into adder, and first complex signal is output by direct digital synthesizer;First complex signal and second noise sequence are passed into complex multiplier, and second complex signal is output;Second complex signal and third noise sequence are passed into second multiplier, and noise interference signal is output.The generation of multi-mode noise interference signal dynamically flexibly is realized.

The present electronic generator of modulated subcarrier pulse signals includes a module for modulating a pulse train, the position and amplitude of which are controllable, forming a switching signal; a switching module, connected to the output of the module for modulating the pulse train, including at least one transistor, controlled by the switching signal, a voltage-controlled frequency-locking oscillator having a frequency-locking band around a free oscillation frequency controlled by a control voltage, connected to the output of the switching module, the switching module making possible the injection of a periodic pulse signal having a frequency spectrum including at least one frequency line within the frequency locking band. Such arrangement makes it possible to obtain, at the output of the oscillator, frequency-controlled, phase-controlled and amplitude-controlled modulated subcarrier pulsed signals.

This invention discloses a hybrid modulation method for suppressing EMI in motor drive chips. Step S1: The oscillation circuit connected to the charge pump circuit combines periodic modulation and random modulation to perform hybrid modulation. Periodic modulation is used for coarse adjustment, modulating the charging and discharging current of the oscillation circuit with a triangular wave signal to obtain a periodically changing oscillation frequency. Random modulation is used for fine adjustment, adjusting the output signal of the oscillation circuit. Based on the coarse adjustment, the oscillation circuit's edge jitters at a certain frequency, randomly changing the delay to slow down the switching edge speed. This invention discloses a hybrid modulation method for suppressing EMI in motor drive chips, employing a combination of periodic and random modulation techniques. Periodic modulation is used for coarse adjustment, and random modulation for fine adjustment, thereby reducing the EMI of the charge pump circuit.

Electronic generator of pulse signals under modulated carrier and associated radio frequency signal transmitter This electronic generator of pulse signals under modulated carrier includes a module (15) for modulating a pulse train whose position and amplitude are controllable, forming a switching signal (S3); a switching module (16), connected at the output of the pulse train modulation module (15), comprising at least one transistor (22), controlled by said switching signal (S3); a voltage-controlled frequency-locked oscillation module (18), having a frequency-locked band around a free oscillation frequency controlled by a control voltage, connected at the output of the switching module (16); the switching module allowing the injection of a periodic pulse signal (S4) having a frequency spectrum comprising at least one frequency line in said frequency-locked band.This arrangement allows the output of the oscillation module to produce pulsed signals (S5) with a modulated carrier controlled in frequency, phase, and amplitude. See Figure 1 for abbreviations.