14results about "Noise generation" patented technology

The invention discloses a noise frequency modulation signal generation device, which is realized based on a field programmable gate array (FPGA), and adopts the following method steps: S1, in the FPGA, constructing an arbitrarily distributed random number generator to obtain random numbers conforming to distribution; s2, linearly mapping the obtained random number into a frequency modulation noise bandwidth by using a linear mapping method to obtain a random frequency conforming to Gaussian distribution; and S3, converting the obtained random frequency into frequency modulation noise by using a direct digital frequency synthesis technology. Complex linear algebraic operation is simplified into integer addition, subtraction and shifting, FPGA parallelism and special hardware resources are fully utilized, high speed, low resources and high statistical quality are considered, and a reliable hardware noise source is provided for scenes such as communication simulation and radar interference.

This invention discloses a planar millimeter-wave or terahertz broadband noise source and its design method, comprising a low-pass filter, an input RF matching circuit, an avalanche noise diode, an output RF matching circuit, and a DC grounding circuit. The input terminal of the low-pass filter is biased to an external constant current source, and its output terminal is connected to the cathode of the avalanche noise diode through the input RF matching circuit. The anode of the avalanche noise diode is connected to the input terminal of the DC grounding circuit through the output RF matching circuit, and the output terminal of the DC grounding circuit outputs an RF signal. This invention achieves the output of a broadband high-frequency noise signal while greatly simplifying the design of the matching circuit. The overall circuit adopts a planar structure, and all components can be integrated on the same substrate, which not only facilitates integration with other circuits but also reduces the difficulty of fabrication and assembly, and reduces transmission losses.

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 application discloses a method and device for phase bit switching using white noise based on a parameter resonator, and relates to the technical field of resonators. The method comprises the following steps: applying an initial bias voltage to a gate DC signal end of a graphene parameter resonator to be measured, and applying a parameter excitation signal to a gate RF signal end; continuously increasing the parameter excitation signal strength until the resonator enters a parameter vibration state, and under the condition, applying a direct driving signal to the gate RF signal end of the resonator, and applying white noise to the source end; gradually increasing the white noise strength from zero until the vibration phase is switched. The application can realize direct switching between two phase bit states, not only avoids the generation of phase noise, but also shortens the time consumed by scanning the direct driving signal frequency and the parameter excitation signal frequency.

The invention discloses a Gaussian random number generation circuit and a Gaussian white noise generation circuit. The Gaussian random number generation circuit comprises a random number generator and a processing circuit. The random number generator is used for generating a target uniformly distributed random number, and obtaining a first uniformly distributed random number and a second uniformly distributed random number based on the target uniformly distributed random number; wherein the bit corresponding to the second uniformly distributed random number is smaller than the bit of the first uniformly distributed random number; the processing circuit is coupled to the random number generator and is used for generating a Gaussian random number according to the first uniformly distributed random number and the second uniformly distributed random number. In this way, generation of the uniformly distributed random numbers can be simplified, and the accuracy of the finally obtained Gaussian random numbers is improved.

The invention relates to an alternating current and direct current mixed noise source device. An alternating current signal source VIN1 is connected with one end of a capacitor C1, and the other end of the capacitor C1 is connected with the common end of a resistor R1 and a resistor R2; one end of the input resistor R3 is connected with the common end of the resistor R1 and the resistor R2, the other end of the input resistor R3 is connected to the base electrode of the first-stage amplifier V1, the emitter electrode of the first-stage amplifier V1 is connected to the base electrode end of the second-stage amplifier V2, the emitter electrode of the second-stage amplifier V2 is connected with one end of the resistor R4, the other end of the resistor R4 is grounded, and the collector electrodes of the two stages of triodes are connected together and connected with VCC; the emitter of the secondary amplifier V2 is connected with one end of a coupling capacitor C2, and the other end of the coupling capacitor C2 is a mixed signal output end VIN2; an inductor L1 is connected between the VCC and the mixed signal output end VIN2, and a capacitor C3 is connected between the VCC and the GND. The circuit has the advantages that two-stage triode current amplification, capacitance coupling, inductance isolation and the like are designed, and the circuit is simple in structure, low in cost and convenient to use.

The application provides a kind of integrated ultra-wideband high-frequency combining noise source device, it is related to noise source circuit field, comprising: bias circuit, combining structure, π attenuator and output port connected with each other in turn;Wherein, bias circuit is used to provide reverse bias voltage for zener diode in combining structure, also be used to adjust noise source super noise ratio ENR;Combining structure includes at least two reverse bias working zener diodes, and zener diode is integrated on microstrip transmission structure in horizontal mode, so that noise signal is always kept in the same plane transmission in combining structure, π attenuator and output port.The technical scheme of the application overcomes the problems of insufficient noise transmission continuity, limited high-frequency end noise power, bias mode affecting radio frequency path and insufficient noise output adjustment flexibility in the prior art.

Systems and methods for treating misophonia include utilizing machine learning within a deep learning processor to allow a user to listen to ambient sounds from their environment without hearing trigger sounds. The method includes the steps of recording ambient sounds with one or more microphones, digitizing the recorded ambient sounds into digital signals, creating spectrographic data for the digital signals, comparing the spectrographic data against a signature library that comprises preprogrammed spectrographic data for the unwanted trigger sounds, identifying the spectrographic data that corresponds to the unwanted trigger sounds, removing the unwanted trigger sounds from the spectrographic data to provide filtered spectrographic data, converting the filtered spectrographic data into a filtered digital signal, converting the filtered digital signal into a filtered audio signal that does not include the unwanted trigger sounds, and playing the filtered audio signal to the user through the one or more speakers on the headset.

The invention provides an integrated ultra-wideband high-frequency combined noise source device, which relates to the field of noise source circuits and comprises a biasing circuit, a combining structure, a pi-shaped attenuator and an output port which are connected with one another in sequence, wherein the bias circuit is used for providing reverse bias voltage for the Zener diode in the combining structure and is also used for adjusting the noise source excess noise ratio (ENR); the combining structure comprises at least two Zener diodes which work in a reverse bias mode, and the Zener diodes are integrated on the micro-strip transmission structure in a horizontal mode, so that noise signals are always kept to be transmitted in the same plane on the combining structure, the pi-type attenuator and the output port. According to the technical scheme, the problems that in the prior art, noise transmission continuity is insufficient, high-frequency end noise power is limited, a bias mode affects a radio frequency path, and noise output adjustment flexibility is insufficient are solved.

The application relates to a wideband noise generation method with adjustable amplitude, comprising the following steps: S1, constructing a tauruswroth uniform random number generator and generating a first random number and a second random number; S2, constructing a SIN / COS and SQRT(LOG) operation lookup table; S3, obtaining a corresponding square root logarithm result value in the SQRT(LOG) operation lookup table by taking the first random number as an address; S4, obtaining a corresponding trigonometric function result value from the SIN / COS operation lookup table after quadrant conversion by taking the second random number as a phase; S5, multiplying the trigonometric function result value with the square root operation result value, and performing bit splicing on the obtained Gaussian distribution random number after multiplication with an amplitude parameter, so as to obtain a group of Gaussian random sequences; and S6, repeating S1 to S5, and performing parallel operation on the generated several groups of Gaussian random sequences, so as to obtain Gaussian noise. The application can realize real-time simulation generation of noise with a bandwidth of 1GHz and an adjustable amplitude of-45 to-75dBm, and has the characteristics of large bandwidth of the generated noise signal and flexible amplitude of the modulated noise.

The invention discloses a multi-distribution noise generation device based on modular operation, which adopts 3D-HCM chaotic mapping, can regulate and control the distribution and amplitude of random numbers by changing parameters, and further realizes the generation of different distribution noises, so that the regulation and control of noise distribution can be realized only by changing the parameters of an upper computer. Then the three paths of random numbers are sent to a noise sequence generation module, it is guaranteed that a chaotic mapping original iteration noise sequence controlled by parameters can be output, a new noise sequence obtained through internal function regulation and control and external function regulation and control can also be output, the sequence of output noise is further enriched, and more requirements are met. The noise sequence output management module carries out subsequent operation on the three noise sequences, and when any one of the generated three noise sequences is selected to be directly output to a subsequent module, randomly distributed noise can be directly generated, or real-time output of the noise can be realized by using an assembly line method and splicing iteration output and then outputting the spliced iteration output. Therefore, the output bandwidth is improved. Meanwhile, random numbers generated by the three-dimensional chaotic mapping iteration module are high in randomness, so that the randomness of generated noise is enhanced.

The invention is entitled "Dynamic noise shaping filter and corresponding method". Various embodiments provide a method, apparatus, system or computer program product for providing a signal with dynamically shaped noise. In an exemplary embodiment, the system comprises a dynamic filter, wherein the dynamic filter is a filter capable of switching between at least two responses; a signal generator configured to generate a signal; and a controller configured to control operation of the signal generator and to select an operating response from the at least two responses of the dynamic filter. The controller causes the signal generator to generate a signal, which is provided to the dynamic filter, and the controller causes the dynamic filter to filter the signal according to the operating response. The filtered signal is then provided to an electronic component of the system to cause at least a portion of the system to perform a function.

The invention provides a white noise generation circuit and equipment, and relates to the technical field of power electronics, the circuit comprises a constant voltage debugging circuit, a noise generation unit, a broadband matching circuit and a blocking output module which are connected in sequence, a debugging current flowing through the noise generation unit is generated; the noise generation unit is used for generating a random thermal noise signal based on the debugging current; the broadband matching circuit is used for performing impedance matching based on the random thermal noise signal to generate a flat random thermal noise signal; and the blocking output module is used for isolating direct current in the flat random thermal noise signal to obtain a flat tank white noise signal. According to the invention, through temperature compensation of the constant voltage debugging circuit on the noise generation unit, noise characteristic drift caused by temperature change is effectively suppressed, and it is ensured that the white noise signal of the flat tank has good spectrum flatness.

The invention provides a digital signal generation method and device. The method comprises the following steps: generating N paths of M-bit uniformly distributed noise signals in parallel by using a linear feedback shift register; an adder is adopted to add the N paths of M-bit uniformly distributed noise signals to obtain a sum signal, and the sum signal obeys Gaussian distribution; the highest bit of the sum signal is inverted and converted into a signed number, and a full-bandwidth Gaussian noise signal is obtained; carrying out Sinc interpolation processing on the full-bandwidth Gaussian noise signal by adopting an interpolation method, wherein the Sinc interpolation processing comprises calculating a relative position of an interpolation point phase and an original sampling point phase; obtaining an interpolation coefficient according to the relative position of the interpolation point phase and the original sampling point phase; and obtaining an interpolation point amplitude according to the interpolation coefficient, the interpolation point and the original sample point, and outputting the interpolation point amplitude. Band-limited Gaussian noise signals of any bandwidth can be generated in real time through a digital circuit, the same structure is achieved, flexibility is high, and expansibility is high; and the method has relatively high real-time performance and relatively high transportability.