50 results about "Pink noise" patented technology

A communication apparatus used for two-way speech wherein the acoustic couplings between a speaker and microphones can be made equal by a simple method, wherein radially arranged microphones are located at equal distances from a speaker, a test signal generation unit outputs a pink noise signal to the speaker, the signal is input to a microphone detecting the sound of the speaker through variable gain amplifiers, attenuated in variable attenuation units, the peak value of absolute values of differences between the signals of an opposing pair of microphones is detected at level detection units, and a level judgment and gain control unit adjusts the gains of the variable gain amplifiers or attenuation amounts of the variable attenuation units so that the value becomes within a sensitivity difference adjustment error.

The invention relates to automobile electronic technology and in particular to a method for objectively testing the performance of an automobile audio device. The method of the invention comprises following steps of: installing a manmade head at an assigned position inside the automobile, wherein the manmade head is configured as a part simulating the structure of double ears of an adult and an embedded microphone used for acquiring sound signals is installed inside manmade head; turning off the audio setting of a player in order to maintain the player in a straight state; enabling the player to play a pink noise signal with set volume and making a loudspeaker in an assigned excited state; and recording and outputting the sound signal to an external analyzing device by using the microphone.

A communication apparatus used for two-way speech wherein the acoustic couplings between a speaker and microphones can be made equal by a simple method, wherein radially arranged microphones are located at equal distances from a speaker, a test signal generation unit outputs a pink noise signal to the speaker, the signal is input to a microphone detecting the sound of the speaker through variable gain amplifiers, attenuated in variable attenuation units, the peak value of absolute values of differences between the signals of an opposing pair of microphones is detected at level detection units, and a level judgment and gain control unit adjusts the gains of the variable gain amplifiers or attenuation amounts of the variable attenuation units so that the value becomes within a sensitivity difference adjustment error.

The present invention discloses a broadband calibration method for sensitivity free field of a hydrophone based on pink noise. The calibration method relates to the field of free-field underwater acoustic measurement and is mainly used for broadband measurement of hydrophone free field sensitivity. According to the method of the invention, a signal source is controlled to transmit a broadband pinknoise signal; a transmitted current signal and a received voltage signal are subjected to synchronous treatment such as interception and zero padding and FFT transformation; finally a transfer function in the frequency domain is obtained. By analyzing the direct wave and reflected wave of a tank, the transfer function is subjected to moving average with a rectangular window; the reverberation influence of the reflected wave of the tank is eliminated; a broadband transfer function of the free field between a transmitting transducer and the hydrophone is obtained; and the broadband measurementfor hydroacoustic parameters such as hydrophone sensitivity is realized. The method can be used for broadband calibration of the hydrophone in an anechoic tank, a reverberant tank, an outfield lake and sea.

Utility data modulation is superimposed on a payload data modulator optical signal by exploiting spread spectrum techniques by virtue of one embodiment of the present invention. Utility data transmission rates of e.g., 200 Kbps, can be achieved without impairment to payload data transmission. The utility data modulated signal spectrum overlaps or is entirely within the payload data modulation spectrum, therefore, overcoming problems with optical amplifier gain control and pink noise.

The invention provides an audio noise real-time detection method based on correlation analysis, which is used for performing real-time noise detection on audio streams. The audio noise real-time detection method comprises the following steps: receiving audio frames, and circularly counting the received audio frames by adopting a frame counter; once the frame counter counts to Nf, performing signal component weakening, correlation analysis and noise judgment, and resetting the frame counter. The audio noise real-time detection method is suitable for detecting various kinds of noises such as white noise, pink noise and high-frequency channel noise in audios; when a signal and noise coexist, the situations of blur audio content and failure in normally listening since the signal is covered by the noise can be avoided; meanwhile, the detection method is simple, is high in processing speed, and can be widely applied to real-time monitoring of audio signals such as broadcast signals and television signals.

The invention provides a deep sleep instrument based on pink noise and a hypnosis method. The deep sleep instrument comprises a digital signal processor (DSP) and a complex programmable logic device (CPLD) connected with the DSP, wherein the output end of the DSP is sequentially connected with an audio decoding chip and an amplifying circuit; and the DSP comprises a white noise generating unit, a sliding average model for filtering white noise and generating pink noise, a timbre model for toning pink noise and a voice output unit in sequential connection. In the invention, the distribution rule of the generated pink noise is consistent with the oscillogram of the brain wave of people in a deep sleep state so as to cause resonance, finally mobilize the physical function, regulate the state of the nervous system as well as guide a sleeper to quickly enter a sleep state and further quickly enter a deep sleep state.

Disclosed is a method for modifying the frequency response of a wood panel within an acoustical structure such as a studio or concert hall. The modification is imparted by exciting the wood paneling with acoustic energy. Frequency response is the measure of a system's spectrum response at the output to a signal of varying frequency (but constant amplitude) at its input. The acoustic energy includes at least one excitation frequency, which is preferably in the audible spectrum (20 to 20,000 Hz). The use of acoustic energy from the remote source provides non-contact excitation of the wood paneling. In one embodiment, the acoustic energy is at least one sound wave which comprises at least one resonant frequency of the wood paneling, at least one acoustic mode of the wood paneling, at least one discrete broadband frequency, a composite frequency (including multiple broadband frequencies, white noise and pink noise) or any combination thereof.

The invention discloses a measurement method for bearing power of a loudspeaker and a measurement device thereof. The method comprises the steps of obtaining resistance R <0 > of a loudspeaker voice coil under environment temperature; superposing pink noises, enabling the loudspeaker to continuously work for a plurality of units of time, and recording the resistance R <n > corresponding to the loudspeaker voice coil at each unit of time node; and obtaining the resistance value R <t > of the loudspeaker voice coil after the temperature of the loudspeaker voice coil is balanced, and a current value I applied to the loudspeaker voice coil, and calculating the bearing power W<t > of the loudspeaker. The measurement device comprises a microcontroller and a measurement circuit connected between a power amplifier and the loudspeaker. The measurement circuit comprises a capacitor, a current source, a first filter, a second filter and a voltmeter. The current source is connected with two ends of the loudspeaker in parallel through the first filter. The voltmeter is connected with the two ends of the loudspeaker in parallel through the second filter. The capacitor is connected with a loop of the measurement circuit in series. According to the method and the device, the bearing power of the loudspeaker can be measured accurately, the measurement speed is fast and the consumed time is short.

The invention discloses a mixed sound recording blocker comprising a power unit, a control unit, a modulation unit, a noise unit, a high-frequency emission unit, a radio frequency unit, a power amplifier unit, a PTZ unit, and an electromagnetic pulse unit. The noise unit includes a white noise generator and a pink noise generator. The mixed sound recording blocker of the invention adopts ultra-low-frequency emission, the receiver of an acoustic sensor is blocked directly, so that the receiver cannot extract or restore received audio signals after saturation, and no harm is brought to the human body or the environment. An effective noise source is selected, and the noise source is modulated in multiple modulation modes so the modulated noise is irregular. An effective means of emission is adopted to meet the following requirements: the emission distance is as far as possible, the spectral coverage is as large as possible, and the saturation effect is as good as possible.

The invention discloses a time sequence noise reduction method and device based on improved singular spectrum analysis. The method comprises the following steps: S1, constructing a trajectory matrix for an original time sequence according to a set window length; S2, constructing a symmetric matrix by using the constructed trajectory matrix, performing singular value decomposition on the symmetric matrix to obtain a feature vector and a feature value, and obtaining a right singular vector of the symmetric matrix and a subclass matrix of the trajectory matrix; S3, adopting a diagonal averaging method for each subclass matrix to obtain an SSA decomposition subsequence; S4, analyzing whether each sub-sequence belongs to a white noise component, a pink noise component or a Brown noise component or not by adopting a de-trending analysis method; and S5, eliminating noise components in the original data and reconstructing residual main components to reduce noise of the original sequence.

A toilet freshener and nightlight may include a flexible arm for attaching a body to a toilet bowel. The body may include a catch for selectively holding a fragrance dispensing container within the body. The body may also include a speaker for emitting white or pink noise or noise canceling waveforms. The toilet freshener may also include a transceiver to communicate with an application run on a mobile processor for allowing remote control of the toilet freshener and nightlight.

The invention provides an audio noise real-time detection method based on sparse decomposition, which is used for performing real-time noise detection on audio streams. The method comprises the following steps: receiving first N frames of audio frames for constructing an initial atom library; performing mute judgment, first sparse decomposition and second sparse decomposition on each audio frame after an Nth frame, circularly counting the audio frames by adopting a frame counter, performing noise judgment once the frame counter counts to N, and meanwhile resetting the frame counter. The audio noise real-time detection method can be used for detecting various kinds of noises such as white noise, pink noise and high-frequency channel noise in audios; when a signal and noise coexist, the situations of blur audio content and failure in normally listening since the signal is covered by the noise can be avoided; meanwhile, the detection method is simple, is high in processing speed, and can be widely applied to real-time monitoring of audio signals such as broadcast signals and television signals.

The invention discloses a pink noise simulator capable of treating insomnia and improving the sleep quality. The pink noise simulator comprises a base body 1, a pink noise type selecting channel 2, a pink noise frequency selecting channel 3, a volume selecting channel 4, a time displaying and timing device 6, a device power source and a switch 7. The switch of the device power source is switched on, the corresponding type, frequency, volume and timing time of pink noise are selected according to the fundamental states of the personal heart rate, hobbies and the like of a user, so that the user feels like entering a natural original ecological environment far from the madding crowd, every part of the body is completely relaxed, the state of syncretism of nature and man is achieved, and therefore the user rapidly enters a sleep state and sleeps soundly.

The invention discloses a nerve regulation and control system for closed-loop pink noise stimulation based on alpha waves. The nerve regulation and control system comprises a real-time sleep monitoring module, a data quality detection module, an alpha wave intensity calculation module, an alpha wave rising edge detection module and a pink noise regulation and control module. The rising edge of the alpha waveform is monitored through a personalized morphological waveform monitoring algorithm, the Alpha wave activity of the brain is adjusted through closed-loop pink noise stimulation in the specific rising stage, meanwhile, the sound intensity of pink noise can be adjusted in a self-adaptive mode, accurate sound stimulation is provided, the sleeping experience of a user is improved, and the sleep experience of the user is improved. Compared with a traditional sleep aiding system, the sleep aiding system has the advantages that the sleep aiding system based on the Alpha waves not only can improve the speed of falling asleep, but also can improve the overall quality of sleep, and has wider applicability and practical significance.

The invention discloses a sleep assistance composite audio generation method and system based on multi-frequency brain waves and a medium, and belongs to the technical field of digital audio processing, and the technical scheme is characterized by comprising the following steps: S1, collecting a brain wave signal of a user in real time through a brain wave monitoring module; s2, dynamically selecting a target frequency band combination according to the sleep stage and setting an amplitude change rule; s4, pink noise with the frequency spectrum range of 20-200 Hz is injected into the composite audio, the energy proportion of the pink noise is 5%-15%, and the amplitude is dynamically adjusted according to the environmental sound pressure level SPLenv. The method has the effect that the limitation of traditional sleep assisting audio is solved through the technologies of multi-frequency brain wave synchronization, personalized customization, dynamic adjustment, diversified audio combination and the like.

The invention discloses a virtual sound source localization capability detection method, system and device and a storage medium. The method comprises the following steps: determining first pink noise for simulating and realizing conductive hearing loss according to a human ear masking effect; determining a plurality of virtual sound source signals in different directions, and performing equal loudness calibration on an in-ear earphone and a bone conduction oscillator according to the virtual sound source signals to obtain first output intensity of the bone conduction oscillator; and simulating a conductive hearing loss environment according to the first pink noise, playing a virtual sound source signal at the first output intensity through the bone conduction oscillator, and further determining a sound source localization capability index of the subject in the conductive hearing loss environment through a bisection task test. The accuracy of sound source localization performance testing is guaranteed, meanwhile, the testing efficiency is improved, the sound source localization capacity in a multi-sound-source scene can be detected, detection is more comprehensive, the sound source localization performance of bone conduction equipment can be improved subsequently, and the method can be widely applied to the technical field of sound source localization.

The invention relates to automobile electronic technology, in particular to an objective test method for automobile audio performance. According to the method of the present invention, the method comprises the following steps: the artificial head is installed at a set position inside the car, the artificial head is provided with parts simulating the adult's binaural structure, and a built-in microphone for collecting sound signals is installed inside; Turn off the audio setting of the player to keep it in a straight-through state; make the player play a pink noise sound signal at a set volume, and make the speaker in a specified excitation state; utilize the microphone to record the sound signal and Output to external analysis equipment.

The invention discloses a pink noise generator for brain memory consolidation stimulation equipment. The pink noise generator is composed of a main control module, a power module, a storage module, anaudio module, a display module, a rotary coding switch module and an output module; the power module, the audio module, the display module and the rotary coding switch module are in unilateral connection with the main control module; the storage module is in bidirectional connection with the main control module; and the audio module is in unilateral connection with the output module. The pink noise generator of the invention can generate pink noise that best matches pink noise parameters. The generator has a simple structure, stable performance and powerful functions, and is especially suitable for brain memory consolidation stimulation equipment.

The invention relates to a method for masking undesired disturbing noises (3), generated by a drivetrain (1) of a vehicle (2), by means of synthetic noises (26), wherein: at least one synthetic noise (26) is output by means of at least one loudspeaker (4) in the vehicle interior; a noise signal (11) representing the synthetic noise (26) passes through a bandpass filter (5) and undergoes a level adjustment before being output in the vehicle interior; and parameters of the bandpass filter (5) and the level adjustment are implemented in accordance with a drivetrain rotational speed (8). The method according to the invention is characterized by the following method steps: - providing a disturbing noise characteristic map (6), comprising a relationship between the frequency band (7), the level and the drivetrain rotational speed (8), for each disturbing noise (3) that can be emitted by the drivetrain (1); - generating a sound signal (12) comprising a sinusoidal sound with a frequency modulation applied thereto, wherein the center frequency of the sound signal (12) corresponds to the average frequency (9) of a disturbing noise (3), which is to be masked, from the disturbing noise characteristic map (6); - generating a defined-noise signal (13) comprising pink noise, wherein the frequency band of the pink noise comprises at least the lowermost and uppermost frequency of the disturbing noise (3) to be masked; and - mixing the sound signal (12) and the defined-noise signal (13) by means of a crossfader (10) to generate the noise signal (11).

The present invention provides a real-time audio noise detection method based on correlation analysis, which is used for real-time noise detection of audio streams. First, audio frames are received, and frame counters are used to perform cyclic counting of the received audio frames; N f After that, weaken the signal component, correlate analysis and noise judgment, and set the frame counter to zero at the same time. The invention is suitable for detecting various types of noise in audio, such as white noise, pink noise, high-frequency channel noise, etc. When the signal and noise exist at the same time, it can also detect that the signal is covered by noise and the audio content is blurred , cannot be listened to normally; at the same time, the detection method has a simple algorithm and fast processing, and can be widely used in real-time monitoring of audio signals, such as radio and television signal monitoring.

The invention discloses a DC micro-grid fault arc modeling and simulation method and system, and the method comprises the following steps: simulating arc faults generated at different arc lengths and occurrence positions, and collecting the arc current data of branches where the arc faults are located; respectively analyzing and fitting the relationship between the corresponding current drop value and the line current and the arc length when the arc fault occurs, the relationship between the volt-ampere characteristic of the arc current in the time domain range and the generation position and the arc length, and the relationship between the pink noise characteristic of the arc current in the frequency domain range and the generation position and the arc length; and obtaining a time domain fitting relationship and a frequency domain fitting relationship; based on the time domain fitting relationship and the frequency domain fitting relationship, establishing a simulation model of the DC microgrid fault arc; and operating the simulation model, and outputting a simulation result of the DC microgrid fault arc. According to the invention, the arc fault in the direct current micro-grid system is simulated, and the time domain and frequency domain characteristics of the arc current are combined, so that actual arc data are comprehensively and accurately close to the actual arc data.

The present invention discloses a correlation coefficient and EMD (Empirical Mode Decomposition) filtering characteristic-based rub-impact acoustic emission signal noise reduction method. The method enables an excellent noise reduction effect for rub-impact acoustic emission signals containing white noises and pink noises, is not influenced by subjective parameters, can obtain stable results and is adaptive. According to the method of the invention, white noises and the pink noises with different signal-to-noise ratios are added to acoustic emission signals collected by a rub-impact acoustic emission test device; EMD is performed on the noise-containing signals, the correlation coefficients of intrinsic mode functions of each order obtained through the decomposition and the noise-containing signals are solved; the change rule of correlation coefficients corresponding to the intrinsic mode functions of each order is searched out based on the filtering characteristics of the EMD; and an intrinsic mode function of which the rub-impact acoustic emission signal energy is large relatively is reconstructed, so that noise-reduced signals can be obtained.

A method for improving the effective signal-to-noise ratio (“SNR”) of an analog to digital converter (“ADC”) for active loudspeakers uses the two available channels of a stereo ADC to separately process the low- and high-frequency components of an audio signal. Because the power spectral density of music approximates a pink noise spectrum, the high-frequency component of the signal has peak levels low enough to avoid exceeding the maximum ADC input level. The audio signal is analog high-pass filtered and the resulting high-frequency signal component is sent directly to a first ADC channel without attenuation. The remaining low-frequency component is attenuated and sent to a second ADC channel. The digital signals are processed, converted back to analog, amplified, and reproduced by loudspeaker drivers. Noise and distortion at low frequencies is less audible than higher frequencies, so the improved SNR at higher frequencies yields a significant practical improvement in audio fidelity.

A measuring system for the directivity of a loudspeaker is designed for solving technical problems that the traditional measuring method for the directivity of a loudspeaker only can be implemented for measuring the directivity in the horizontal direction and the vertical direction, the complete three-dimensional directivity of a sphere cannot be measured, and requirements of building a precise acoustic model of the loudspeaker cannot be met. A control system of the measuring system controls a sound producing system to rotate and to generate pink noise, and pink noise signals are received by a receiving system and are processed, so that three-dimensional directivity data of the loudspeaker are generated. A rotary platform for fixing the loudspeaker is arranged on the upper surface of a support frame of the sound producing system, and is used for combining rotation in the horizontal direction with rotation in the vertical direction, so that the three-dimensional directivity of the loudspeaker can be measured. Three-dimensional directivity data of loudspeakers for various purposes can be measured, and three-dimensional directivity patterns can be generated. The measuring system has the advantage that the loudspeaker can be changed at optional angles in three-dimensional space, the precise three-dimensional directivity data and directivity patterns are obtained, and the measuring system reliably guarantees building of a precise acoustic model of the loudspeaker and the accuracy of acoustic simulation.

The invention discloses a mixed sound recording blocker comprising a power unit, a control unit, a modulation unit, a noise unit, a high-frequency emission unit, a radio frequency unit, a power amplifier unit, a PTZ unit, and an electromagnetic pulse unit. The noise unit includes a white noise generator and a pink noise generator. The mixed sound recording blocker of the invention adopts ultra-low-frequency emission, the receiver of an acoustic sensor is blocked directly, so that the receiver cannot extract or restore received audio signals after saturation, and no harm is brought to the human body or the environment. An effective noise source is selected, and the noise source is modulated in multiple modulation modes so the modulated noise is irregular. An effective means of emission is adopted to meet the following requirements: the emission distance is as far as possible, the spectral coverage is as large as possible, and the saturation effect is as good as possible.

The embodiment of the invention discloses a multi-frequency intelligent sleep-aiding eyeshade system integrating multiple sound therapies, which is applied to intelligent sleep-aiding eyeshade equipment and comprises a user interface used for selecting different sound therapy modes; wherein each mode is associated with a corresponding parameter; the processing unit is used for calling a preset audio signal based on selection of different sound therapy modes; the audio signals comprise 40Hz sound, white noise, pink noise and natural sound; the audio signal processing unit is used for processing the received audio signal so as to ensure the definition and the stability of the audio signal; the bone conduction driving module is used for converting the processed audio signal into low-frequency vibration, and is in contact with the skull of the user through the intelligent sleep-aiding eyeshade equipment to directly transmit sound vibration; the sleep assisting device has the advantages that the sleep quality of the user can be remarkably improved, physical and mental relaxation is promoted, and therefore the sleep assisting effect and the user experience are improved.

A method for improving the effective signal-to-noise ratio (“SNR”) of an analog to digital converter (“ADC”) for active loudspeakers uses the two available channels of a stereo ADC to separately process the low- and high-frequency components of an audio signal. Because the power spectral density of music approximates a pink noise spectrum, the high-frequency component of the signal has peak levels low enough to avoid exceeding the maximum ADC input level. The audio signal is analog high-pass filtered and the resulting high-frequency signal component is sent directly to a first ADC channel without attenuation. The remaining low-frequency component is attenuated and sent to a second ADC channel. The digital signals are processed, converted back to analog, amplified, and reproduced by loudspeaker drivers. Noise and distortion at low frequencies is less audible than higher frequencies, so the improved SNR at higher frequencies yields a significant practical improvement in audio fidelity.

A computer-implemented method performed on a user device includes receiving a signal from an auditory device. The method further includes generating a hearing profile for a user associated with the user device. The method further includes implementing pink noise band testing. The method further includes implementing speech testing. The method further includes implementing music testing. The method further includes updating the hearing profile based on the pink noise band testing, the speech testing, and the music testing. The method further includes transmitting the hearing profile to the auditory device.

A computer-implemented method performed on a user device includes receiving a signal from an auditory device. The method further includes generating a hearing profile for a user associated with the user device. The method further includes implementing a pink noise band test. The method further includes determining one or more presets that correspond to user preferences. The method further includes updating the hearing profile based on the pink noise band test and the one or more presets. The method further includes transmitting the hearing profile to the auditory device.