137results about How to "Strong noise" patented technology

The present invention discloses a receiving system and a method of processing data to receiving and processing mobile service data. The receiving system may include a signal receiving unit, a demodulating unit, a data processor, and a middleware engine. The signal receiving unit receives a broadcasting signal, which includes IP packets, payload of the IP packets including a DSM-CC module data part and a DSM-CC header, the DSM-CC module data part including a plurality of DSM-CC objects, and the DSM-CC header including identification information for identifying the DSM-CC module. The demodulating unit demodulates the received broadcasting signal including IP packets. The data processor extracts a plurality of DSM-CC objects of a corresponding payload with reference to DSM-CC header information of the IP packets demodulated by the demodulating unit and configuring a DSM-CC module, which includes identification information and the extracted DSM-CC objects. The middleware engine provides a data broadcasting service by driving application corresponding to the DSM-CC module.

The invention discloses a method for detecting zero crossing time, frequency and phase difference of power sinusoidal signals. In the method for detecting zero crossing time, by using the fundamental principle that a sinusoidal signal close to the zero crossing can be approximately equivalent to a linear signal, after a zero crossing position of a signal is worked out by rough calculation, a voltage amplitude close to the signal zero crossing is counted by the unary linear regression theory so as to acquire the zero crossing time of the sinusoidal signal. The method for detecting a frequency of a zero crossing point of a sinusoidal signal comprises the following steps of: obtaining a period value of each zero crossing point by carrying out the cumulative mean on each zero crossing point phase different of the obtained signal, and solving the reciprocal to obtain the signal frequency value. The method for detecting phase difference comprises the following step of calculating the phase difference between different signals by means of a zero crossing point phase value of each different signal. The invention is insensitive to the relative position of the zero crossing point of the actual signal, can realize higher detection accuracy in the digital detection system, has a strong suppression function to the noise of the signal source and the interference, and finally ensures the application of the method in a high-accuracy detection field.

The invention discloses a seashell-diatom ooze wall surface decoration wall material and a production and construction method thereof. The decoration wall material comprises: 20 to 98 parts of shell powder, 8 to 30 parts of silica, 4 to 100 parts of kieselguhr, 2 to 20 parts of medical stone, 3.8 to 48 parts of mica powder, 2 to 10 parts of magnesium-rich silicate, 6 to 26 parts of scolecite, 1.5to 36 parts of hydrosilicate, 0 to 50 parts of titanium dioxide powder, 2 to 50 parts of calcium carbonate, 0.1 to 0.3 part of vegetable fiber, 1 to 30 parts of pigment, 4.8 to 40 parts of kelp powder, 1 to 30 parts of cold soluble polyvinyl alcohol powder and 1 to 20 parts of hydroxypropyl methyl cellulose. The production and construction method comprises: placing the raw material components into a stirrer for uniform stirring; filling the mixture in bags, packing the bags in boxes, sealing the boxes and storing the boxes in a storehouse; adding water into the mixture and stirring the mixture uniformly; and pasting the mixture on a wall surface to be decorated to make various texture patterns. The seashell-diatom ooze wall surface decoration wall material has the advantages of: (1) soft texture and no toxicity, fading nor stripping; (2), characteristics of eliminating indoor pollution, regulating indoor humidity, eliminating odor, isolating noises and offering high skin texture feel; (3) fire proofing and flame retarding; and (4) rich color.

The invention discloses a headset communication method under a strong-noise environment and a headset. The method comprises: using earplugs to reduce medium and high frequency noises entering an ear canal, using an external connection cavity in parallel connection with the ear canal to divert medium and low frequency noises; using an internal microphone to pick up the sound in the ear canal and an environmental noise signal entering the ear canal, using an external microphone to pick up the environmental noise signal, and taking the external microphone signal as reference signals to eliminate the noise element in the internal microphone signal and remain the voice element to obtain transmitting terminal signals of the headset; using sound dynamic compression technology to cut down and compensate the signals picked up by the external microphone in terms of sound pressure level such that the sound pressure range is compressed to a range acceptable by human ears and the signals picked up by the external microphone and the receiving terminal signal received by the headset are broadcast together through a receiver of the headset. By means of the technical scheme of the present invention, the functions of protecting hearing, enhancing voice and monitoring a three-dimensional environment can be achieved comprehensively under strong-noise environments.

The invention relates to an optimized cesium-light-pump weak magnetic detection device. In the optimized cesium-light-pump weak magnetic detection device, a non-magnetic-effect thermostatic controller enables a cesium spectrum lamp and a cesium sample absorbing bulb to be in the constant-temperature steam state, a radio frequency source stimulates the cesium spectrum lamp to emit light, and the light is converted into left handed circular polarization light to illuminate the cesium sample absorbing bulb, and focused on a photoelectric detector through a convex lens; a magnetoresistive sensor magnetic measuring module assists in measuring the value of a geomagnetic field of the position where the device is located, the range of strength is judged through an embedded type processing terminal module, and a self-oscillation module is controlled in a segmentation mode; photomagnetic resonance signals of the cesium sample absorbing bulb are detected by a low-noise photoelectric conversion circuit and simulate a high-frequency coil on the cesium sample absorbing bulb after being amplified and dephased so as to constitute a self-oscillation circuit, and Larmor signals are output; a Larmor signal measuring module and a big-dipper / GPS locating module are used for accurately measuring the value of the geomagnetic field of the position where the device is located. According to the optimized cesium-light-pump weak magnetic detection device, by means of the method achieving auxiliary magnetic field measurement, subband control, accurate frequency measurement and dual-mode locating, detection accuracy and reliability of the device are guaranteed.

A motor driving apparatus includes a virtual difference voltage detecting unit operable to detect a difference voltage between a virtual neutral point of a resistor circuit connected in parallel to motor coils and a terminal of a motor coil in non-conduction state, a rotor position detecting unit operable to detect a position of the rotor based on the difference voltage, and a controller operable to control commutation of an inverter based on the rotor position. The motor driving apparatus has a searching start mode for detecting the rotor position and energizes the coils, and a back electromotive voltage feedback mode for controlling commutation based on the back electromotive voltage. In the searching start mode, a rotor position searching process and a rotation start torque applying process are alternately performed.

The invention discloses a hybrid dual-module network method based on wired and wireless. The method is applied to a dual-mode communication network in a wired network mode and a wireless network mode,the dual-mode communication network is of a tree-shaped network structure, the dual-mode communication network is of a tree-shaped network structure and comprises a plurality of nodes, the nodes comprise a master node and a plurality of access slave nodes, and the communication of the slave nodes and the master node supports the wired communication mode and the wireless communication mode. The wired and wireless hybrid dual-module network method provided by the invention has the characteristics of strong anti-interference and anti-noise capabilities, reliable and stable communication and thelike; the wired and wireless hybrid dual-module network method does not need additional wiring, is not blocked by buildings such as walls, is not influenced by shielding of the metal shell, and bettersolves the problems that the wireless network has coverage dead angles and communication blind spots cannot be covered by the wired network.

The invention discloses a time domain combined synchronization method for an OFDM ultra wide band system receiver. A new information frame format is determined according to requirement of all synchronization methods; after frame timing combined synchronization operation and symbol timing combined synchronization are carried out on received signals sequentially, whether carrier fraction frequency deviation synchronization or carrier integer frequency deviation synchronization is executed is determined according to window interval, and then the data in dual sliding window is used for carrier fraction frequency deviation combined synchronization; or combined synchronization operation of carrier integer frequency deviation is carried out according to the result of the symbol timing combined synchronization operation to obtain the carrier integer frequency deviation, so as to complete one operation period of the combined synchronization method. The invention has higher synchronization precision and anti-interference performance and realizes high integration of all synchronization methods and share of relevant parameters and operation result.

In a display apparatus having an active matrix substrate, a counter substrate provided so as to be opposed to a pixel array region of the active matrix substrate, and a display medium provided in a gap between the active matrix substrate and the counter substrate, an optical sensor (11) is provided in a peripheral region of the pixel array region in the active matrix substrate. In order to make it difficult for the optical sensor (11) to change with time, and suppress the influence of electromagnetic noise on the optical sensor (11), in an upper layer of the optical sensor (11), a surface protective film (24) is formed of a transparent insulation layer (20a) made of the same material as that of an interlayer insulation film in the pixel array region and having an effect of attenuating a UV-light transmittance and a transparent conductive layer (7a) formed of the same material as that of the pixel electrode in an upper layer of the transparent insulation layer (20a).

The invention provides a system and a method for controlling a speedless sensor of a permanent-magnet synchronous motor. The system comprises a motor body unit, an inverter unit, an SVPWM (space vector pulse width modulation) unit, a first comparator, a second comparator, a first PI (proportion and integration) controller, a second PI controller, a first coordinate conversion unit, a second coordinate conversion unit, a third coordinate conversion unit and a sliding mode extended Kalman filter. A sliding mode variable structure control law is embedded in an extended Kalman filter state equation and an output equation, a digital extended Kalman filter is finally acquired through linearization and discretization, and state evaluation of reference stator current and rotator rotating speed omega r is acquired through expanded Kalman recursion; control on the speedless sensor of a permanent-magnet synchronous motor control system is realized, and real-time updating of the reference stator current under d-q coordinates is realized. By the system and the method, control on the speedless sensor of a permanent-magnet synchronous motor can be effectively realized, high-frequency chattering generated by independently applying a sliding mode variable structure for controlling is inhibited, and accurate measurement on the speed and the position of a rotor of the motor is realized.

The invention relates to a method for the ultrasensitive simultaneous measurement of nonlinear optical emission signals in one or two local dimensions. Said method comprises the following steps: the excitation light is irradiated in a power-modulated or pulse-modulated form from at least one light source into an interactive volume or onto an interactive area or layer (hereafter called interactive spaces) in which one or several emissions that are nonlinearly correlated with the excitement light can be excited; the light emanating from said interactive spaces is measured by means of a one-dimensional or two-dimensional detector array; the measured data is transmitted from said detector array to a computer, and said data is formatted in a one-dimensional or two-dimensional data matrix. The inventive method is characterized in that non-correlated portions of the light emanating from the interactive spaces or the portions thereof that are linearly proportionate to the intensity of the excitement light available in said interactive spaces are separated from portions of the light emanating from the interactive spaces, which are not linearly proportionate to the intensity of the available excitement light. The invention further relates to an analytical system that is suitable for carrying out the inventive method.

The invention discloses a screw extrusion type sludge dewatering machine, comprising a machine base (1), a water inlet part, a sludge exit part (41), a water outlet part, a screw shaft (2) with a spiral blade (21), as well as a filter disc assembly composed of a plurality of annular static filter discs (5) and annular dynamic filter discs (6) in a cross-interval arrangement; wherein, each static filter disc (5) is fixed relatively to the machine base (1); the internal diameter of each dynamic filter disc (6) coincides with the external diameter of the blade (21) and has line contact with the blade (21); moreover, the space between two adjacent static filter discs (5) is slightly greater than the thickness of the dynamic filter disc (6) between the two adjacent static filter discs (5) so as to form a gap (7) between the static filter discs (5) and the dynamic filter disc (5); water can flow through the gap (7). Compared with the prior art, the invention enables water to directly flow out through the gaps of the filter disc assembly so as to avoid the abrasion to the static filter discs and the dynamic filter discs caused by sludge; the device has a longer service lifer and adopts only one power source to realize solid-liquid separation, so that the energy consumption is lower; besides, the components of the device are easy to install and simple in structure to facilitate actual implementation.

The present invention discloses a receiving system and a method of processing data to receiving and processing mobile service data. The receiving system may include a signal receiving unit, a demodulating unit, a data processor, and a middleware engine. The signal receiving unit receives a broadcasting signal, which includes IP packets, payload of the IP packets including a DSM-CC module data part and a DSM-CC header, the DSM-CC module data part including a plurality of DSM-CC objects, and the DSM-CC header including identification information for identifying the DSM-CC module. The demodulating unit demodulates the received broadcasting signal including IP packets. The data processor extracts a plurality of DSM-CC objects of a corresponding payload with reference to DSM-CC header information of the IP packets demodulated by the demodulating unit and configuring a DSM-CC module, which includes identification information and the extracted DSM-CC objects. The middleware engine provides a data broadcasting service by driving application corresponding to the DSM-CC module.

The invention discloses an automatic fast mine monitoring image stitching method comprising the following steps: first, a Harris algorithm is adopted to initially obtain feature points at a single scale, an SIFT algorithm is adopted to precisely locate the feature points, and SIFT descriptor information is utilized on the basis so as to stably and quickly extract image feature points; second, a locality sensitive Hashing (LSH) algorithm is adopted to carry out feature matching search and solve the problem that the time efficiency of a Kd tree search algorithm in a high-dimensional data set is not high; third, an improved RANSAC algorithm is adopted to screen matching points and calculate a transform matrix so as to improve the accuracy of matching point screening; and finally, stitching is carried out by an image fusion algorithm. Experimental results show the method can be applied to automatic coal mine underground video monitoring image stitching, and has scientific reference value to image stitching in other complex environments.

The invention relates to a method for automatically detecting a deflection fault of a railway wagon locking plate and belongs to the field of railway detection. A fault-free target automatic identification mode is adopted; the method is on the basis of an approximate linear segment outline of an object and adopts linear segment characteristics to describe; the requirement on a memory is effectively reduced; the direction of a linear segment is subjected to directional encoding on the basis of the linear segment characteristics and an interval of the directional encoding is the maximum normal deflection angle of the locking plate; and finally, estimation on a deflection range is implemented by utilizing directed Chamfer matching. The method uses the simple characteristics, is not influenced by the position of a target and variation of surface texture and has strong robustness and noise immunity; in a complex scene, the range of the deflection angle can be accurately estimated and the position of the fault-free locking plate can be accurately positioned; in the whole process, only one template is required; identification efficiency is ensured; and the method lays a foundation for engineering application of fault image identification of a railway wagon.

The invention discloses a method for quantitatively detecting microvolt T-wave alternans. A new effective quantitative TWA (T-wave alternans) detection index is provided by analyzing external shape of a T-wave alternans scatter diagram according to the relation of the external shape and the T-wave alternans. By means of improved T-wave window analysis method, the method includes: subjecting 128 continuous heartbeat T-wave sampling point sequences to first difference and drawing a scatter diagram, analyzing the relation of the external shape of the scatter diagram and the T-wave alternans, researching an effective 'cross searching method' to subject the scatter diagram to edge extraction, then defining three quantitative parameters of short axis, long axis and the ratio of the short axis to the long axis at the 'edge' of the scatter diagram, utilizing the ratio of the short axis to the long axis as quantitative detection index Axial_ratio, and finding a proper threshold to judge whether the T-wave alternans exist or not.

In a condenser microphone in which a microphone capsule and an audio output section are connected to each other via a microphone cord, strong electromagnetic waves generated by a cellular phone etc. are prevented from being transmitted by the microphone cord and intruding into the audio output section. In a condenser microphone in which a microphone capsule 10 and an audio output section 20, in which a circuit board 23 including an audio output circuit is housed in a shield case 210, are connected to each other via a microphone cord 30, of the circuit board 23, a terminal 231 connected to the microphone cord 30 is arranged on the outside of the shield case 210.

The present invention discloses a magnetic field nicking analysis method for extraction of a physical geography magnetic anomaly field boundary. An analysis relation between a magnetic field and a gravitational field is employed, namely a Poisson's equation, to deduce three components of a second-order spectral moment at the surface of the magnetic field to obtain result parameters of magnetic field surface nicking analysis. The method comprises the four steps of: 1, magnetic field component conversion; 2, total magnetic field modulus anomaly [Delta]T total horizontal component module surfacelocal surface element second-order spectral moment; 3, total magnetic field modulus anomaly [Delta]T total horizontal component module surface local surface element invariant statistics; and 4, boundary coefficient extracted from the magnetic field surface. The magnetic field nicking analysis method is employed to perform boundary extraction of the magnetic field to eliminate the false boundary caused by associated anomaly while retaining the high enhancement capacity, resolving power and noise suppression capacity of the gravity nicking analysis for the weak boundary so as to provide more efficient reference information for the interpretation of the geologic structure.

The invention relates to a complex structure damage cooperative identification method based on ultrasonic guided-wave. The method comprises a preliminary identification mechanism and a feedback decision mechanism. The preliminary identification mechanism is used for realizing preliminary judgment of damage types of various complex structures; and the feedback decision mechanism is used for realizing optimization of the damage identification result, and thus recognition rate is effectively improved. In the preliminary identification mechanism, damage signals are comprehensively analyzed in the aspects of time domain, frequency domain and detail features of the signals by utilizing a characteristic quantity extracting method for ultrasonic guided-wave characteristics to obtain corresponding characteristic quantity; and a three-layer "input unit layer-order parameter layer-output unit layer" damage cooperative identification network model is constructed. The feedback decision mechanism is introduced on the basis of complex structure damage primary recognition; characteristic quantity assessment based on within-class among-class mean distance is adopted, and damage characteristic quantity most suitable for cooperative training is selected; and prototype characteristic vector reconstruction is carried out by utilizing an information superposition method, and thus error identification rate is effectively reduced.

The invention discloses a telescope rack control system. The signal input end of a motion controller is connected with an azimuth axis encoder and a pitch axis encoder, the signal output end of the motion controller is connected with an azimuth axis actuator and a pitch axis actuator in a controlled mode, and the azimuth axis actuator and the pitch axis actuator are connected with an azimuth axis torque motor and a pitch axis torque motor in a control mode respectively; a single chip microcomputer control system comprises a single chip microcomputer, the signal input end of the single chip microcomputer is connected with a pitch axis speed measuring motor, an azimuth axis speed measuring motor, a pitch axis limit switch, an azimuth axis limit switch and a position sensor, the signal output end of the single chip microcomputer is connected with an azimuth axis actuator power source, a pitch axis actuator power source, an azimuth axis power-off brake, a pitch axis power-off brake and a stepping motor actuator, and the stepping motor actuator is connected with a stepping motor; a computer is connected with the motion controller and the single chip microcomputer in a controlled mode. It can be effectively prevented that an azimuth axis and a pitch axis exceed a motion range to cause faults, and safe operation of a telescope is ensured.

The invention relates to an automatic detection method for a loose fault of an end bolt of a crossover support device of a train bogie, and belongs to the field of railway fault detection. The methodcomprises the following steps: generating a coding sequence image by using a binary coding method reflecting local changes on the basis of a constructed image sequence, wherein the coding sequence image is used to extract local and internal structural features of a target part; locating a position of a locking plate through the spatio-temporal context algorithm; and finally detecting the deflection angle of the locking plate according to the acquired locking plate image through the Radon transform based on the gradient direction weighting to realize the discrimination of a loose fault of a bolt. The invention solves the problem that bolt loose fault is detected only by using image information. Compared with the prior art, the invention uses the sequence image, so that the corresponding updating is carried out by using the position of the locking plate detected by the previous frame image, all regions of the image need not be detected, and the invention has very high real-time performance, and lays a foundation for engineering application of freight car fault image identification.

The invention discloses an underwater acoustic digital voice communication system and an underwater acoustic digital voice communication method under a quick mobile platform, and relates to the underwater acoustic digital voice communication system. The communication system is provided with a vocoder and a peripheral circuit, a DSP and a peripheral circuit, a power amplification and matching circuit, a pre-amplifier, a band-pass filter, a power management module and an underwater acoustic transducer. The vocoder and the DSP are connected and communicated with each other via a RS232; the DSP isused for performing modulating / demodulating, frequency hopping / de-hopping, channel / coding / decoding, frame synchronization and Doppler frequency shift estimation and compensation on voice coding data,and communicating with the vocoder; the power amplification and matching circuit is used for amplifying the power of a transmission signal and matching the impedance of a transmitting transducer, andthus maximizing the output power; the band-pass filter filters the out-band noise of the underwater acoustic transducer, particularly low-frequency sea noise; the power management module is used forperforming voltage conversion and stabilization; and the underwater acoustic transducer is applied to conversion between the electrical signal and the acoustic signal or between the acoustic signal and the electrical signal.

The invention discloses a method for optimizing double-layer image segmentation of multiclass color texture images based on a variation model. The method comprises the steps of establishing a multiclass variation active contour model, obtaining an energy function of the multiclass variation active contour model, carrying out disperse expression on the energy function of the multiclass variation active contour model, establishing a multilayer image segmentation model, solving the energy function of the multiclass variation active contour model after disperse expression to obtain a globally near optimal solution, and carrying out multi-layer image segmentation minimality optimization on multiclass disperse variation active contour energy in an iteration mode to achieve stable segmentation.

A digital broadcasting system and a method of processing data is disclosed. A receiving system of the digital broadcasting system may include receiving system may include a signal receiving unit, a demodulating unit, a deinterleaver, and a decoder. The signal receiving unit receives a broadcast signal including mobile service data. The mobile service data may construct a code block, the code block including at least one data packet for the mobile service data, an RS parity generated based on the at least one data packet, and a CRC checksum generated based on the at least one data packet and the RS parity. The demodulating unit performs demodulation on the received mobile service data. The deinterleaver deinterleaves the demodulated mobile service data. The decoder corrects error generated from the mobile service data by performing CRC decoding and RS decoding on the code block of the deinterleaved mobile service data.

The invention relates to a method for detecting characteristics of edge and angular point of color pictures. The technical proposal of the method is characterized by comprising the steps that: calculating the spatial gradient of each color channel of the color pictures, projecting the spatial gradient onto the color space which is insensitive to the illuminance information of shadow, light and shade and spectrum; generating an unchanged-illuminance color tensor by using unchanged-illuminance differential coefficient and own Cartesian inner product; and carrying out characteristic decomposition to obtain the partial orientation corresponding to the maximum characteristic value; then a filtering kernel of a symmetrical orientation tensor is controlled and generated by the partial orientation information, convolution filtering based on the filtering kernel of the symmetrical orientation tensor of the unchanged-illuminance color tensor is carries out to obtain a new color tensor; the characteristic value decomposition of the new color tensor is carried out to obtain a characteristic value and a characteristic vector and derive a characteristic measurement; detecting the characteristic of the edge and angular point. The detection of the characteristic of the edge and angular point is carried out by utilizing the characteristic of the sensor, thereby providing the designed characteristic detecting apparatus with visual characteristic better conforming to the eyes of human beings and restraining stronger noises.

An apparatus for detecting positions of wheels of a vehicle is provided. In the apparatus, a triggering signal is transmitted from the body side to each transceiver mounted at each wheel. In each transceiver, the strength of the received triggering signal is measured and formatted into a frame of data to be transmitted to a receiver mounted to the vehicle body. The strength of the triggering signal is used to detect wheel positions by determining that each transducer is disposed at which wheel. The receiver determines if there is a reply of the flame of data containing the strength when the triggering device transmits the triggering signal. When no replay comes from the transceiver, the strength of noise is measured in the transceiver in response to a command from the receiver. When the noise strength is less than a threshold, the receiver commands an alarm member to issue alarm.

The invention relates to a method for preparing architectural ceramic bricks by wet-casting molding of granite waste wet. The method comprises the following steps: by taking granite wastes as main raw materials, by taking water as a dispersing medium, by taking carrageenan, sesbania glue and low polymer sodium polyacrylate as additives, mixing to obtain slurry; preparing architectural ceramic bricks by adopting a wet-casting molding process, drying and fettling, firing at the temperature of 1140-1180 DEG C, and cooling to obtain the architectural ceramic bricks with the breaking strength of 50-70MPa. The method is simple in preparation process; compared with the traditional architectural ceramic dry pressing process at present, the method has the advantages that large tonnage press and spray material preparation are saved, dust and noise pollution are reduced, the production cost is low, hard brittle materials serve as main raw materials, the problem that clay and other traditional high-quality ceramic raw materials are increasingly scarce is relieved, and the problem that a green ceramic body molded by using the hard brittle materials is low in strength is solved. Moreover, compared with similar architectural ceramics, the architectural ceramic bricks are low in price, and higher economic benefits can be brought.

The invention relates to measuring the mobility spectra of ions with ion mobility spectrometers (IMS). The invention provides an analog modulation of the ion current of an IMS ion source with a continuous modulation function, the instantaneous frequency of which temporally varies across a large frequency range, and a generation of the mobility spectrum from the measured ion current by a correlation analysis with the modulation pattern. The modulation can, for example, be produced by the gating grid, which is usually present. The analog modulation removes many of the difficulties which occur with square-wave modulation and leads to a surprisingly stable evaluation which is relatively insensitive to noisy signals and produces a high mobility resolution at very low noise.

A method, as well as a system and a computer readable medium based on the method, for reducing perceived noise, characterized by comprising the steps ofdetermining an area of interest (12, 14, 15, 16) in the image, the area of interest (12, 14, 15, 16) being determined in dependence of a foveal vision of a user; andapplying a stronger noise filtering in a peripheral area (13) of the image than in the area of interest (12, 14, 15, 16), the peripheral area (13) being outside the area of interest (12, 14, 15, 16) and corresponding to a peripheral vision of the user