32 results about "LOW AMPLITUDE SIGNAL" patented technology

In general, the invention is directed to an IMD having a piezoelectric transformer to power a lead-based sensor. The IMD powers the piezoelectric transformer with a low amplitude signal. The piezoelectric transformer serves to convert the voltage level of the low amplitude signal to a higher voltage level to drive the sensor produced by a battery in the IMD to voltage levels appropriate for IMD operation. A piezoelectric transformer offers small size and low profile, as well as operational efficiency, and permits the IMD to transmit a low amplitude signal to a remote sensor deployed within an implantable lead. In addition, the piezoelectric transformer provides electrical isolation that reduces electromagnetic interference among different sensors.

A signal-to-noise ratio dependent adaptive spectral subtraction process eliminates noise from noise-corrupted speech signals. The process first pre-emphasizes the frequency components of the input sound signal which contain the consonant information in human speech. Next, a signal-to-noise ratio is determined and a spectral subtraction proportion adjusted appropriately. After spectral subtraction, low amplitude signals can be squelched. A single microphone is used to obtain both the noise-corrupted speech and the average noise estimate. This is done by determining if the frame of data being sampled is a voiced or unvoiced frame. During unvoiced frames an estimate of the noise is obtained. A running average of the noise is used to approximate the expected value of the noise. Spectral subtraction may be performed on a composite noise-corrupted signal, or upon individual sub-bands of the noise-corrupted signal. Pre-averaging of the input signal's magnitude spectrum over multiple time frames may be performed to reduce musical noise.

This disclosure provides cascaded reference circuits and low amplitude signal sensing circuits that are useful in wearable devices. Circuits for measuring electrovesselgram (EVG) and subdermal spectrogram (SSG) are provided, as well as methods for using these circuits to determine quantities and qualities of a person's moods, such as how much and what kinds of stress they experience. The provided devices are useful on limbs and appendages, such as in a smart watch that is worn on the wrist. Methods are provided for using the devices of this disclosure to privately alert wearers to an increase in bad stress in the moment when they can take actions to reduce their stress and physiological stress responses. These devices are useful for measuring and increasing the effectiveness of relaxation techniques. As a result of using methods and devices of this disclosure, people are healthier, they make more response-able decisions, and relationships improve.

Systems and methods in which an ultrasonic signal is introduced into an audio signal before the audio signal is amplified by a switching amplifier. The added ultrasonic signal (e.g., a tone at half the amplifier's switching frequency) shifts the signals input to a set of power switches so that they do not switch nearly simultaneously. The ultrasonic signal causes the output current to be well defined to eliminate dead time distortion at low signal levels. Adding the tone ultrasonic signal causes the distortion to shift to an amplitude greater than zero. Signals that exceed this amplitude will experience the distortion, but the distortion will be less noticeable than in lower-amplitude signals. Signals that do not exceed this amplitude will not experience the distortion at all. Adding an ultrasonic signal may also draw energy away from the switch frequency and its harmonics to interference with AM radio reception.

A chopper stabilized amplifier that utilizes a multi-frequency chopping signal to reduce chopping artifacts. By utilizing a multi-frequency chopping signal, the amplifier DC offset and flicker noise are translated to the higher chopping frequencies but are also smeared, or spread out in frequency and consequently lowered in amplitude. This lower amplitude signal allows for less stringent filtering requirements.

The systems and methods of detecting a change in object presence in a magnetic field disclosed herein inject a low amplitude signal near the resonant frequency into the coil until the system comes to equilibrium. At this point the feedback is measured. The feedback signal can be measured as at least one of several signals, for example, but not limited to the voltage on the resonant capacitor, the current in the coil, and the voltage between the resonant capacitor and the coil. A change in the steady state response indicates a change in device presence.

The invention discloses a method for improving far-field sound pickup of a microphone array based on keywords, including the steps: after the keywords are detected by a keyword recognition engine, performing clustering operation on the cached single-frame sound source orientation to obtain the sound source orientation with high reliability, and then calculating the input signal gain of the far-field sound pickup algorithm by using the signal envelope maximum value, and switching the device to the wake-up state, wherein in a wake-up state, the algorithm includes input signal gain adjustment, beam forming, noise suppression, reverberation elimination, AGC, etc, At this time, the AGC can set a small adjustment range to avoid amplifying the low-amplitude signal as background noise, so that when the target keyword is detected, the sound source direction and the amplitude gain of the input signal in the wake-up state can be determined according to the keyword, thereby improving the speech enhancement effect of the far-field sound pick-up of the microphone array.

The present invention provides a data latch circuit which can operate stably with a low-amplitude signal, which consumes less electric power, and which is resistant against the variation in TFTs. When an analog switch is turned on, a data signal is inputted to a gate electrode of an n-channel TFT and, at this time, VDD is supplied to an input terminal of an inverter. When the analog switch in turned off, the n-channel TFT is turned on or off depending on a level of the data signa. When the data signal is at an H level, the n-channel TFT is turned on and VSS is supplied to the input terminal of the inverter. When the data signal is at an L level, VDD is supplied to an input terminal of the inverter. Therefore, only VDD and VSS levels are applied to the input terminal of the inverter.

The invention relates to an A/D conversion circuit structure used in broadband communication, and is characterized in that: the output end of a nonlinear amplifier is connected with the input end of an analog-digital converter (ADC); the ADC is connected with an inverse transform circuit; the nonlinear amplifier comprises two resistors, an amplifier and two diodes. The output function of the nonlinear amplifier is characterized in that: the amplifier has more gain on high-probability analog input signal and less gain on low-probability analog input signal. On the basis of no pinch off of high-amplitude signal and no adding of an extra circuit, the invention has outstanding processing capacity of low-amplitude signal; the combined action of the amplifier and the ADC ensures that A/D conversion inhibits both the minor quantized noise of low-amplitude signal (high probability) and the major quantized noise of high-amplitude signal (low probability); then, the signal received by the ADC can be processed by the inverse transform circuit to maintain the linear relation of input and output.

An apparatus and method of testing one-time-programmable memory limits current through a one-time-programmable memory to less than a threshold amplitude, where the memory has a fuse configured to blow upon receipt of a signal having the threshold amplitude. The method also uses blow signal assertion circuitry to attempt to assert a blow signal to the fuse. When not defective, blow signal assertion circuitry is configured to permit the low amplitude signal to flow through the fuse when the fuse is not blown and the blow signal is asserted. The method then produces an output signal having a success value if the limited current flows through the fuse, and a failure value if the current does not flow through the fuse.

This disclosure provides cascaded reference circuits and low amplitude signal sensing circuits used to perform a Subsurface Spectrogram (SSG). The Subsurface Spectrogram can detect the conductive properties of skin and the underlying tissues. The conductive properties inform what electrolytes and moisture levels are present, which in turn can provide information about the physiological state of the mammal. The Subsurface Spectrogram uses an arbitrary waveform generator to provide a reference signal, the return signals are captured and compared to their original characteristics for changes in amplitude, phase and frequency. From these calculations insight into the amount of skin moisture and electrolyte configuration can be gained. Embodiments of such systems may be especially useful in health and fitness wearable devices where feedback on health and exercise can help mammals achieve an optimal workout, or help them to know when they are experiencing unhealthy stress levels. Methods are provided for using the devices of this disclosure to privately alert wearers to an increase in bad stress in the moment when they can take actions to reduce their physiological stress responses. These devices are useful for measuring and increasing the effectiveness of relaxation techniques. As a result of using methods and devices of this disclosure, people are healthier, they make more responsible decisions, and relationships improve.

Provided is a high-frequency low-amplitude signal identification method aimed at a high-frequency fluctuating pressure test system. With dominant frequency of a second modal unstable wave as criterion, signals which are not related to the second modal wave are eliminated by using singular value decomposition and empirical mode decomposition. An implementation mode of the method comprises: firstly,based on energy spectrum density and linear stability theories, determining the dominant frequency of a second modal unstable wave, using the dominant frequency as criterion; then, based on a chaos theory, performing phase-space reconstruction on a one-dimensional pulsation signal, and performing singular value decomposition on a reconstruction matrix, extracting a second modal wave; finally, using empirical mode decomposition, eliminating noise introduced by phase-space reconstruction.

The invention relates to a multi-media advertising board capable of being used for mobile phone fast charging. The mobile phone fast charging device with the advertising function comprises a master control processing module, a network communication module, a multi-media display module, a positioning module, a data storage module, an abnormity warning module, a mobile charging module and a signal processing circuit. The master control processing module is separately connected with the multi-media display module, the positioning module, the data storage module, the abnormity warning module, themobile charging module and the signal processing circuit, and the signal processing circuit is connected with the network communication module. Signals are received by a receiving circuit, the low-amplitude signals are filtered away, the high-amplitude signals are output, and the interference of the low-amplitude signals is avoided; then filtration is conducted through an adjusting circuit and a RC circuit, the abnormal signals are filtered away through a clamping circuit, and the signals are proportionally amplified through an amplifying circuit and then output; according to the mobile phonefast charging device, scanning payment of Wechat and Alipay is combined with mobile phone fast charging, and the mobile phone fast charging device has the multi-media advertising function.

The invention discloses a method for solving radiation standard exceeding in I2S transmission, which is characterized in that the level amplitude of a clock signal is reduced at the source end of theI2S transmission, and the level amplitude of the clock signal is reduced at the receiving end. The invention further discloses a system for solving the problem that radiation exceeds the standard in I2S transmission. The device comprises a source end device and a receiving end device, the source end device is connected with a first level conversion circuit, the first level conversion circuit is connected with a first end of an FFC flat cable, a second end of the FFC flat cable is connected with a second level conversion circuit, and the second level conversion circuit is connected with the receiving end device. According to the invention, the level conversion module is added at the I2S source end to reduce the amplitude of a clock signal in the I2S, so that the signal is low in amplitude and small in energy in the transmission process, and radiation standard exceeding is not easily caused; and, at a receiving end, the circuit is used for restoring the low-amplitude signal. High speed and low time delay are ensured in level conversion, time sequence requirements are met, and signals are ensured not to be distorted.

The invention relates to a fast mobile phone charging device having a multimedia advertisement function. The fast mobile phone charging device having the multimedia advertisement function comprises amaster control processing module, a network communication module, a multimedia display module, a positioning module, a data storage module, an abnormity alarm module, a mobile phone charging module and a signal processing circuit. The master control processing module is connected with the multimedia display module, the positioning module, the data storage module, the abnormity alarm module, the mobile phone charging module and the signal processing circuit; and the signal processing circuit is connected with the network communication module. The device receives a signal through a receiving circuit, filters out a low-amplitude signal and outputs a high-amplitude signal, thereby preventing interference of the low-amplitude signal; abnormal signal is filtered by a regulation circuit RC circuit and removed by a clamping circuit, and after proportional amplification of an amplification circuit, the signal is output; and the device combines WeChat, Alipay code-scanning payment and mobile phone fast charging, and has the multimedia advertisement function.

Some embodiments concern a method of isolating low amplitude signals in one or more electrical signals. The method can include: using a data acquisition device to acquire one or more electrical signals; using a first processor to compute one or more first parameters related to the one or more electrical signals; using the first processor to determine one or more first portions of the one or more electrical signal that comprise one or more transient signals; using the first processor to selectively mask the one or more first portions of the one or more electrical signals to create one or more output signals; and adjusting a gain of the data acquisition device based upon one or more second parameters of the one or more output signals. Other embodiments are disclosed.

The invention discloses a multiplexing orthogonal PSWF (Prolate Spheroidal Wave Function) pulse-modulated signal demodulation method. The method comprises the following steps: performing matched filtering processing on received signals to obtain output signals; sequencing the received signals from high power to low power according to the magnitude of output energy after matched filtering, wherein the first signal is a highest-amplitude signal while the last signal is a lowest-amplitude signal; detecting the energy difference among each pulse, adopting a whitening detection method based on successive interference cancellation if the energy difference is large, and adopting a decorrelation detection method if the energy difference is small.