1205 results about "Decibel" patented technology

A communications device includes a demapping and demodulation circuit and processes an OFDM communications signal that includes modulated subcarriers carrying communications data forming a data payload and modulated subcarriers carrying a training sequence forming a preamble. Those OFDM subcarriers carrying the training sequence have a sample for each subcarrier at a frequency bin using evenly spaced, equal amplitude subcarriers that have a set phase of each sinusoid to a specific angle with quadratic phase to form a low peak-to-average power ratio (PAPR) preamble with about a PAPR value of 2.6 decibels (dB). A channel estimate circuit is operative for measuring fluctuations within a flat-top spectrum of the received OFDM communications signal corresponding to the preamble to reflect the frequency response of the communications channel.

A portable digital ultrasonic monitoring system and method for use by an operator in detecting the ultrasonic waves and temperature variations produced by sources such as leaks in pipes, arcing, electrical corona and machinery defects is provided. The digital ultrasonic monitoring system includes a microprocessor based system in a hand held elongate housing that digitally analyzes and stores information received from its sensors. The digital ultrasonic monitoring system provides a referenced decibel output reading of the signal strength of the received ultrasonic signals. In addition, a heterodyned type audio signal that is related to the sensed ultrasonic signals is provided to the operator through a pair of headphones. The portable device has user input keys that allow the operator to select from a variety of different operating modes. A display displays a variety of different readings depending upon the operating mode of the device.

An improved safety related compact hand-portable apparatus for home or office use, EQ-Alert TM is ceiling or shelf mountable, activating upon sensing a minimum-threshold earthquake preferably of about 3.25/Rictor-scale intensity, instantly emitting a series of approximate 110-decibel level siren-alarms; preferably along with activation of a safety-lamp to illuminate an immediate floor-area in event of community power-outage. A preferably dry-cell powered dc/electronic IC-chip timer-circuit, limits duration of the audible-alarm, triggered by sufficient movement of an internal omni-directional mercury n.o./jiggle-switch. Upon completion of the timed audible-alarm and optional voice-chip announcement, the timer-circuit sequences a conventional integral superheterodyne-AM/radio user has preset to a local Conelrad/news-station, for ongoing notification of any earthquake rescue procedures. Optional provision for plug-in circuit-modules, facilitates adding of allied safety-units, such as substantially conventional smoke-alarm, and carbonmonoxide-alarm detectors, sharing the audio-transducer and IC-microprocessor; to issue forth separate short programed voice-announcements as to the detected hazards.

Aspects of a method and system for utilizing Givens rotation expressions for quantization for a general beamforming matrix in feedback information. In one aspect of the invention, feedback information is computed at the receiving MIMO wireless device based on a geometric mean decomposition (GMD) method. The feedback information may include a matrix that describes a wireless medium. The matrix may represent a multiplicative product of at least one rotation matrix and at least one diagonal phase rotation matrix. Each of the rotation matrices may include at least one matrix element whose value is based on Givens rotation angle. The transmitting MIMO wireless device may subsequently transmit a plurality of signals via the wireless medium based on the received matrix information. The signal strength and/or signal to noise ratio (SNR) measurement (as measured in decibels, for example) associated with each of the transmitted plurality of signals may be about equal.

A method and apparatus are disclosed for enhancing, within a signal bandwidth, a corrupted audio-frequency signal. The signal which is to be enhanced is analyzed into plural sub-band signals, each occupying a frequency sub-band smaller than the signal bandwidth. A respective signal gain function is applied to each sub-band signal, and the respective sub-band signals are then synthesized into an enhanced signal of the signal bandwidth. The signal gain function is derived, in part, by measuring speech energy and noise energy, and from these determining a relative amount of speech energy, within the corresponding sub-band. In certain embodiments of the invention, the signal gain function is also derived, in part, by determining a relative amount of speech energy within a frequency range greater than, but centered on, the corresponding sub-band. In other embodiments of the invention, the sub-band noise energy is determined from a noise estimate that is updated at periodic intervals, but is not updated if the newest sample of the signal to be enhanced exceeds the current noise estimate by a multiplicative threshold (i.e., a threshold expressible in decibels). In still other embodiments of the invention, the value of the noise estimate is limited by an upper bound that is matched to the dynamic range of the signal to be enhanced.

Operational data is utilized to determine the FEXT interference induced by one line into the other DSL line. FEXT interference can be calculated using the NEXT interference measured between the two lines at the upstream ends of the loops and the downstream channel transfer function of one of the loops. Because the NEXT and transfer function constitute a linear time-invariant system, as does the FEXT interference between the lines, the NEXT interference and line transfer function can be multiplied (if in linear format) or added (if in logarithmic format) to approximate the FEXT interference between the lines. The collection of data, calculations and other functions performed in these techniques may be performed by a system controller, such as a DSL optimizer. An Xlog(u,n) quantity is a decibel-magnitude representation of the insertion-loss equivalent of FEXT transfer functions and is defined as the ratio of (1) a line u's source power into a matched load of 100 Ohms when no binder is present to (2) the power at the output of the subject line when line u is excited with the same source and the binder is present. Xlin(u,n) is the linear equivalent of Xlog(u,n). The Xlog(u,n) and Xlin(u,n) quantities may be represented in specific formats that assist in their use in DSL and other systems. When defined as a line's insertion loss, Xlin (or equivalently Xlog) does not include the effect of any transmit filter.

A method and apparatus for implementing optical network quality using bit error rate and chromatic dispersion. According to one embodiment of the invention, a method includes the provision of quality of service in a wavelength division multiplexing optical network that supports a plurality of bit rates. As part of this method, the cumulative noise and cumulative chromatic dispersion for each available path as a whole is determined, where an available path is a series of two or more nodes each connected by an optical link on which a set of wavelengths is available for establishing a lightpath. In addition, different grades of path quality are distinguished based on bit error rate (BER), where BER is based on cumulative noise and bit rate. Furthermore, a minimum path quality is required based on chromatic dispersion decibel penalty, where chromatic dispersion decibel penalty is based on cumulative chromatic dispersion and bit rate.

The invention is suitable for the technical field of communications, and provides a method for setting volume of a mobile terminal. The method comprises the following steps of detecting noise of an environment to generate a corresponding noise signal, and determining the level of the noise signal, wherein the level is classified according to the decibel size of the noise; calling a corresponding preset volume setting, or according to the current level of noise signal, establishing a corresponding recommended volume setting; and obtaining an operation signal for changing the volume size, changing the preset volume setting or the recommended volume setting, and storing. The noise of the current environment is detected and classified, and then the volume setting of a loudspeaker or an external earphone corresponding to the current noise level is called or recommended for the user, so by calling or recommending the playing volume of an audio stream for the user habit, the user can obtain a good experience when the mobile terminal is used for conversation or a multimedia is played.

The present invention provides the multimodality filtration surveillance comprising of a plurality of filtration stages executed at the backend server to confirm nature of anomaly in an event, the filtration stages comprising: a first filter of a video anomalies detection in the event for a specified time-place value, a second filter of a city soundscape adapted to provide a localized decibel maps of a city, a third filter of a geocoded social network adapted to semantically read and analyze data from one or more social media corresponding to the specified time-place value, and a fourth filter of an event triggered or proactive local participatory surveillance adapted to provide augmented information on the detected anomalies.

Described herein are ultra wide-band distributed RF (UWB-DRF) front-end receivers comprising composite cells distributed along transmission lines, where each composite cell comprises a low-noise amplifier (LNA) merged with a mixer. By merging the LNA and the mixer in each composite cell, the power consumption and chip area of the RF front-end is reduced. Further, the distributed architecture of the RF front-end allows it to operate over a wide bandwidth by absorbing the parasitic capacitances of the composite cells into the transmission lines of the RF-front end. Embodiments of the RF front-end provide wideband flat gain, low noise figure (NF), wideband linearity, and wideband matching at the inputs of the RF front-end. In an embodiment, a programmable resistance at the termination of the RF transmission line allows the RF front-end to trade off a few decibels of mismatch at the RF input for higher gain and lower NF.

The invention discloses a fingerprint database construction method of a WiFi indoor positioning system. The method comprises the following steps: determining the position and the coordinates of a reference point, capturing the media access control address of access points at the reference point, collecting signal strength of all the access points in a media access control address list, and sending a sampling file to a server; conducting statistical treatment on signal strength data in the sampling file to obtain a fitting probability distribution curve, conducting correlation correction on the fitting probability distribution curve, conducting truncation processing on the probability distribution curve obtained after the correlation correction, calculating the probability of each decibel milliwatt value, conducting normalization processing, and finally generating a fingerprint database. The method solves the problems that the establishment process of a traditional fingerprint database is longer in consumed time, the processing is tedious, the fingerprint information is insufficient, and updating and maintenance are not facilitated. Due to the parallelization of fingerprint collection, the establishment of the fingerprint database is accelerated, optimized processing is carried out on the collected fingerprint data, and the fingerprint database is more accurate and comprehensive.

The embodiment of the invention discloses a method for controlling the peripheral environment volume of a mobile terminal and a mobile terminal, wherein the method comprises the following steps: obtaining a volume decibel value which is sent by electronic equipment in the peripheral environment; judging whether the volume decibel value is beyond a preset threshold value or not; and if so, sending volume control signals to the electronic equipment in a wireless transmission mode so that the electronic equipment adjusts the volume according to the volume control signals. The volume of the peripheral electronic equipment is controlled when the incoming call or outgoing call gets connected by a mobile terminal user; remote controllers corresponding to the electronic equipment in the peripheral environment do not need to be searched one by one, and the volume of the electronic equipment in the peripheral environment is automatically adjusted; the difficulty and consumed time for searching the remote controllers are reduced; simultaneously, the communication of the mobile terminal user cannot be interfered by the noise of the peripheral electronic equipment; the communication quality and communication effect of the mobile terminal are prompted; and the experience of the mobile terminal user in communication is strengthened.

A firearm discharge detection device and alarm system featuring a plurality of detector units placed inside a structure which communicate with a central monitoring unit. Each detection unit will detect the discharge of a firearm in its proximity from decibel levels and duration using on board filters and timers and thereon signal the central monitoring unit. A digitized embodiment may also be used to determine the sound of a firearm using a digitized fingerprint of the sound compared to an library of firearm sounds in onboard memory by a microprocessor. The central monitoring unit will thereupon communicate with all the other detection devices installed to sound an audible and/or visible alarm to occupants to exit. Concurrently the central monitoring unit will communicate the firearm discharge and location to police. An optional directional exit alarm or warning to hide may also be activated.

The invention provides a GNSS/MINS (global navigation satellite system/micro-electro-mechanical systems inertial navigation system) super-deep combination navigation method, aiming to realize super-deep combination of a GNSS and an MINS. The GNSS uses a direct location estimation method to estimate location errors, speed error and clock errors according to location and speed auxiliary information provided by an INS (inertial navigation system) to close loops; a system takes an MIMU (MINS inertial measurement unit) and a base band correlator as sensors to realize all the navigation functions in a top combinational algorithm, in other words, the algorithm takes the GNSS base band correlator as the sensor of sensitive space-time locating fields and takes the MIMU as the sensor of sensitive inertance fields to realize integral combination of the GNSS and the MINS; and by the aid of the INS, the GNSS combines multichannel information to perform vector phase discrimination and vector locating. The invention further provides super-deep combination system and device applied to the method. The method, the system and the device have the advantages of high navigation accuracy, good dynamic property, high GNSS tracking sensitivity, high GNSS anti-interference performance, wide GNSS dynamic pulling range and the like; and in theory, the dynamic range is limited by trends of the MINS, and -160dBM (decibels above one milliwatt in 600 ohms) signal tracking can be realized by the GNSS by the aid of the MINS.

A hand-held drilling device, and method for drilling using the device, has a housing, a transducer within the housing, with the transducer effectively operating at ultrasonic frequencies, a rotating motor component within the housing and rigid cutting end-effector rotationally connected to the rotating motor component and vibrationally connected to the transducer. The hand-held drilling device of the present invention operates at a noise level of from about 50 decibels or less.

The invention relates to a portable hearing testing and hearing-aid testing and matching integrated system which is characterized by comprising a main body, a control unit arranged in the main body, a hearing test device connected with a phase circuit and a machine of the control unit, a hearing-aid testing and matching device, a wireless internet device and a remote expert database sharing device. The hearing test device comprises an internal hearing meter, a hearing-aid testing and matching program and an external hearing device. The hearing test device is used for inputting comprehensive hearings (sound signals of loudness decibels heard by the patient under different frequencies) of detected air conduction and bone conduction related to a hearing-aid worn by a patient and to the hearing-aid testing and matching device directly coupled with the hearing test device. According to the technical scheme, the portable hearing testing and hearing-aid testing and matching integrated intelligent system established on the basis of a notebook computer organically couples the internal hearing meter and the hearing-aid testing and matching program into a device so that the hearing testing environment and the hearing-aid wearing environment are completely coincident, meanwhile, the comprehensive hearings of the detected air conduction and the bone conduction are completely seamlessly input to the hearing-aid testing and matching, thus the actual use effectiveness of the hearing-aid is increased, the error that the general mute hearing testing environment is not coincident with the hearing-aid wearing environment is avoided, the time required for respectively carrying out hearing testing and the hearing-aid testing and matching is greatly reduced, and equipment cost and service cost are reduced.

The invention discloses a flexible ultrasonic phased array transducer which comprises a flexible piezoelectric ceramic composite material chip, a damping back material, a matching layer, a flexible circuit board, a coaxial cable and a probe interface. The matching layer, the flexible piezoelectric ceramic composite material chip and the damping back material are adhered together in sequence to form an acoustic laminating layer. The flexible circuit board is connected with the flexible piezoelectric ceramic composite material chip, and the multi-core coaxial cable is led out from the flexible circuit board to the probe interface. When the center frequency Fc of the ultrasonic transducer equals to 7.85 MH, the bandwidth Bw can reach 87.78 %, pulse echo sensitivity Sr equals to minus 36.54 decibels, and crosstalk of adjacent array elements is minus 34 decibels. The flexible ultrasonic phased array transducer can be applied to industrial non-destructive testing.

The invention discloses a method and a device for regulating volume, and a digital terminal. The method comprises the following steps of: acquiring sounds in a peripheral environment, and extracting a characteristic frequency spectrum of the sounds; comparing the characteristic frequency spectrum of the sounds in the peripheral environment with a preset noise characteristic frequency spectrum library, and judging whether the sounds are noise or not; if the sounds in the peripheral environment are noise, measuring and acquiring a decibel value of the sounds in the peripheral environment by the terminal; calculating and acquiring a volume value which is suitable for an environment according to the decibel value of the sounds; and regulating the volume of the terminal according to the acquired volume value which is suitable for the environment. The invention also discloses the device for implementing the method and the digital terminal.

A communications device includes communications data and a training sequence corresponding to a preamble. A modulation and mapping circuit modulates the communications data and training sequence into a plurality of multiple subcarriers that are orthogonal to each other to form an orthogonal frequency division multiplexing (OFDM) communications signal having modulated subcarriers carrying the communications data forming a data payload and modulated subcarriers forming the preamble. The modulation and mapping circuit applies a quadratic modulation to the subcarriers carrying the training sequences to produce a low peak-to-average power (PAPR) preamble of approximately 2.6 decibels (dB) independent of the number of subcarriers.