74 results about "Transmission amplitude" patented technology

A disk drive is disclosed for connecting to a host, the host comprising loopback circuitry operable to loop a pattern received from the disk drive back to the disk drive. The disk drive comprises interface circuitry including a transmitter driver operable to transmit transmission signals at a transmission amplitude, and a receiver driver operable to receive reception signals. The transmitter driver is configured to transmit at an initial transmission amplitude, and a calibration pattern is transmitted to the host through the transmitter driver. The reception signals received by the receiver driver are monitored to detect a loopback pattern representing a loopback of the calibration pattern. The loopback pattern is processed to detect an error, and the transmission amplitude is adjusted in response to the error.

The invention discloses a Huygens metasurface unit, a transmission array antenna and a unit phase control method. Each unit comprises a dielectric substrate, an upper metal layer located on the uppersurface of the dielectric substrate and a lower metal layer located on the lower surface of the dielectric substrate. Each of the upper metal layer and the lower metal layer comprises an opening metalresonance ring, and a metal patch is embedded in each metal resonance ring; the opening positions of the opening metal resonance ring of the upper metal layer and the opening metal resonance rings ofthe lower metal layer are antisymmetric. A metasurface is composed of a plurality of unit structure arrays; by adjusting the size of an opening of the outer ring and the length of the embedded metalpatch respectively, the unit structures can achieve the 360-degree transmission phase control under the condition of keeping the transmission amplitude higher that -2.5 dB. The Huygens metasurface unit is provided with a ultra-thin single-layer dielectric structure, does not need the punching design, is easy to machine, can be effectively used for the design of microwaves and even terahertz wave bands, such as beam deflection and transmission arrays, and can also be used in the aspects of invisibility and imaging.

A region in a metallic panel that facilitates the transmission of radio frequency signals. The metallic panel may be included in a window such as the window of a vehicle or building. For example, the metallic panel may be used for heating or to reflect infrared radiation. An aperture is formed in the metallic panel to enable radio frequency signals to be transmitted through the metallic panel. The design of the aperture may be selected to enable the transmission of the desired frequency band. Furthermore, the aperture is designed such that there is a taper in the transmission amplitude and / or the phase to suppress lobing effects on the other side of the aperture. In an embodiment in which the metallic panel is used to conduct electric current, the aperture may be oriented such that the current may flow between the openings of the aperture. Accordingly, there may be uniform heating across the metallic panel without blocking the transmission of radio frequency signals in the desired frequency band.

An envelope calculation section (113) calculates the amplitude of a transmission signal after the multiplexing thereof. When the calculated amplitude is beyond a permissible amplitude value, a correction coefficient calculation section (114) calculates a correction coefficient that is the difference between amplitude values before and after a correction. Multiplication sections (115) and (116) calculate a correction value by multiplying a filter coefficient by a correction coefficient. Subtraction sections (119) and (120) subtract the correction value from the transmission signal after a filtering operation. Thereby, the transmission amplitude at the time of a peak can be suppressed without increasing the number of filter operation circuits.

An apparatus and method is disclosed that allows a participant in a conference call to receive conference call roster information at a telephone display unit, at a computer display or at both types of display. The conference call information is updated during the call and includes identification of the speaker during a conference call. The conference callers are connected together and identified either by standard caller identification or by other identification provided by the operator. The conference callers' identifications are then transmitted in two ways. First, a coded signal is sent over the telephone connection to a telephone display unit. Second, an information packet is transmitted over the Internet to a conference call participant's computer. A server computer monitors the conference call and the identification of parties involved is updated and parties are added or disconnected. The speaking party is identified in one of two ways. First, during the call, the speaker's telephone line will have a higher transmission amplitude than the other telephone lines and the line with the highest transmission amplitude will be identified by the server computer. Second, voice identification data is gathered before the conference call and stored in the server computer for use in identifying the speaker.

A small ultrasound diagnostic device is provided at a low cost that enables the appropriate control by a single power supply unit so as to give a predetermined transmission power to a driving waveform different for each mode without excess or deficiency and without affecting properties of the driving waveform. The ultrasound diagnostic device includes: an ultrasound generation unit (1) that transmits ultrasound; a waveform generation unit (2) that generates a single pulse or a burst pulse whose duty factor is variable in units of a time that is a period corresponding to a frequency outside a frequency band of the ultrasound generation unit (1) so as to drive the ultrasound generation unit (1); and a single power supply unit (3) that determines an amplitude of a driving waveform generated by the waveform generation unit (2). Thereby, an acoustic power of the transmitted ultrasound can be controlled without making the transmission amplitude variable.

A region in a metallic panel that facilitates the transmission of radio frequency signals. The metallic panel may be included in a window such as the window of a vehicle or building. For example, the metallic panel may be used for heating or to reflect infrared radiation. An aperture is formed in the metallic panel to enable radio frequency signals to be transmitted through the metallic panel. The design of the aperture may be selected to enable the transmission of the desired frequency band. Furthermore, the aperture is designed such that there is a taper in the transmission amplitude and / or the phase to suppress lobing effects on the other side of the aperture. In an embodiment in which the metallic panel is used to conduct electric current, the aperture may be oriented such that the current may flow between the openings of the aperture. Accordingly, there may be uniform heating across the metallic panel without blocking the transmission of radio frequency signals in the desired frequency band.

An apparatus and method is disclosed that allows a participant in a conference call to receive conference call roster information at a telephone display unit, at a computer display or at both types of display. The conference call information is updated during the call and includes identification of the speaker during a conference call. The conference callers are connected together and identified either by standard caller identification or by other identification provided by the operator. The conference callers' identifications are then transmitted in two ways. First, a coded signal is sent over the telephone connection to a telephone display unit. Second, an information packet is transmitted over the Internet to a conference call participant's computer. A server computer monitors the conference call and the identification of parties involved is updated a parties are added or disconnected. The speaking party is identified in one two ways. First, during the call, the speaker's telephone line will have a higher transmission amplitude than the other telephone lines and the line with the highest transmission amplitude will be identified by the server computer. Second, voice identification data is gathered before the conference call and stored in the server computer for use in identifying the speaker.

In a method for transmission of digital data in an optical free-space transmission system in which a binary code sequence produced from the digital data is used to transmit amplitude-modulated light waves across an optical free space between a transmitter and a receiver, according to a first aspect, the binary code sequence is produced such that a modulation frequency of the light waves determined by the binary code sequence has a value of 70 Hertz. According to a second aspect, ‘t’ light waves are modulated with the binary code sequence and binary data are transmitted in blocks during a first time period, and non-modulated light waves are emitted during second time periods, wherein the light intensities of the time periods are selected so that the quantities of light transmitted in two periods correspond to predetermined quantities of light.

The disclosure concerns a method of simulating the image projected by a mask during photolithography including determining by a processor (702), taking into account the thickness of a masking layer of a mask, a near-field transmission amplitude curve of light passing through the mask across at least one pattern boundary in the initial mask layout; calculating by the processor, for each of a plurality of zones, average values of the curve; and simulating by a simulator (708) the image projected by the initial mask layout during the photolithography based on the average values.

The invention provides a transmission type miniaturized 90-DEG phase shifter. The transmission type miniaturized 90-DEG phase shifter includes a main microstrip line and a choking structure, wherein the main microstrip line includes a dielectric layer board, a main microstrip transmission line and a metal backing plate, the main microstrip transmission line is connected with one side of the dielectric layer board, the metal backing plate is connected with the other side of the dielectric layer board, two PIN diodes are connected in parallel between the main microstrip transmission line and themetal backing plate, one end of the choking structure is connected with the main microstrip transmission line, the other end of the choking structure is connected with a positive pole of an externalDC stabilized power supply, and the metal backing plate is connected with a negative pole of the external DC stabilized power supply. The transmission type miniaturized 90-DEG phase shifter is advantaged in that output phase difference can be 90 DEG, a phase shift error is less than 5 DEG, transmission amplitude difference is small, the regulatory response time is short, energy consumption is low,power consumption is less than 1mW, the state switching speed can reach the ns level, the phase shifter can be combined with digital signal processing and phased array radar communication systems, etc., the phase shifter has a very high application value in the military and civilian fields, and the phase shifter is applied to the technical field of a phase shifter.

The invention discloses a broadband dual-polarized double-layer transmission array unit, and belongs to the field of antenna design. The broadband dual-polarized double-layer transmission array unit includes fylfot metal patches, metal through holes and a dielectric substrate. The sizes of the fylfot metal patches can be changed. The broadband dual-polarized double-layer transmission array unit has the metal through holes within a certain size range and does not have the metal through holes beyond the size range. The fylfot metal patches have a structure of central symmetry and the two same layers are respectively located on upper and lower surfaces of the dielectric substrate. The metal through holes are connected with the fylfot metal patches located on the upper and lower surfaces of the dielectric substrate. The distances from all the metal through holes to the structural centers of the fylfot metal patches are the same. When the sizes of the fylfot metal patches change, the distances between the line widths thereof and the metal through holes change in proportion. The invention provides the broadband dual-polarized double-layer transmission array unit which can achieve 360-degree phase shift coverage under the condition that the transmission amplitude is greater than -1dB, supports dual polarization, has a high transmittance within a relatively broadband range, and has only two metal patches and the single-layer dielectric substrate.

In a WDM-PON system wherein a plurality of ONUs transfer signals by sharing wavelengths, one wavelength dedicated to a ranging procedure is set, and the ranging is performed with only the dedicated wavelength, so as to measure reciprocating delay times. At the other wavelengths, transmission signals from a plurality of ONUs are transferred in time division multiplexing based on the obtained reciprocating delay times. An OLT includes a burst receiver circuit for only the wavelength dedicated to the ranging, and subsequently to the ranging, the OLT adjusts transmission amplitudes and transmission phases for the ONUs, so as to equalize received amplitudes and received phases in the OLT. For this purpose, the OLT includes means for measuring the amplitudes and phases of received signals, as the burst receiver circuit, and it includes a table for managing the received amplitudes and received phases of the respective ONUs.

The invention provides an S parameter detection apparatus and method. The S parameter detection apparatus is applied to a vacuum micro-discharge test apparatus and comprises a signal separation apparatus, a vector network analyzer and a main controller, wherein the signal separation apparatus is configured to separately divide a coupling transmission signal, a coupling reflection signal and a coupling output signal into two circuits of signals; the vector network analyzer is configured to receive a coupling transmission signal, a coupling reflection signal and a coupling output signal outputted by the signal separation apparatus and outputs a reflection signal amplitude variable quantity, a reflection signal phase variable quantity, a transmission amplitude variable quantity and a transmission phase variable quantity by virtue of corresponding measurement modes; and the main controller is configured to calculate echo loss, standing waves and transmission loss according to an input power monitoring value, a reflection power monitoring value and an output power monitoring value.

The invention discloses a bone conduction sound production device and wearable equipment, wherein the bone conduction sound production device comprises an external packaging structure, the external packaging structure is internally provided with a hollow cavity, and the hollow cavity is internally provided with: a hollow elastic sheet; an exciter, which comprises an upper magnetic piece and a lower magnetic piece, wherein the upper magnetic piece and the lower magnetic piece are oppositely arranged in parallel in the Z-axis direction, and a gap exists between the upper magnetic piece and the lower magnetic piece to form an isolation area; a space low-frequency adjusting plate, which is arranged between the hollowed-out elastic piece and the exciter, wherein the space low-frequency adjusting plate is used for adjusting the framework stacking of the hollowed-out elastic piece and the exciter in the Z-axis direction and adjusting the gap of the isolation area; the hollowed-out elastic piece is matched with the space low-frequency adjusting plate to adjust the effective vibration area of the hollowed-out elastic piece so as to adjust the resonant frequency point of the device. The wearable equipment provided with the bone conduction sound production device can transmit low-frequency signals, wherein the transmission amplitude is moderate, the whole sound frequency band is balanced, the good acoustic effect is achieved, and the user experience and the product sound quality are remarkably improved.

A small ultrasound diagnostic device is provided at a low cost that enables the appropriate control by a single power supply unit so as to give a predetermined transmission power to a driving waveform different for each mode without excess or deficiency and without affecting properties of the driving waveform. The ultrasound diagnostic device includes: an ultrasound generation unit (1) that transmits ultrasound; a waveform generation unit (2) that generates a single pulse or a burst pulse whose duty factor is variable in units of a time that is a period corresponding to a frequency outside a frequency band of the ultrasound generation unit (1) so as to drive the ultrasound generation unit (1); and a single power supply unit (3) that determines an amplitude of a driving waveform generated by the waveform generation unit (2). Thereby, an acoustic power of the transmitted ultrasound can be controlled without making the transmission amplitude variable.

A small ultrasound diagnostic device is provided at a low cost that enables the appropriate control by a single power supply unit so as to give a predetermined transmission power to a driving waveform different for each mode without excess or deficiency and without affecting properties of the driving waveform. The ultrasound diagnostic device includes: an ultrasound generation unit (1) that transmits ultrasound; a waveform generation unit (2) that generates a single pulse or a burst pulse whose duty factor is variable in units of a time that is a period corresponding to a frequency outside a frequency band of the ultrasound generation unit (1) so as to drive the ultrasound generation unit (1); and a single power supply unit (3) that determines an amplitude of a driving waveform generated by the waveform generation unit (2). Thereby, an acoustic power of the transmitted ultrasound can be controlled without making the transmission amplitude variable.

The invention discloses a transmission type metasurface for circular polarization beam forming. Each unit of the metasurface comprises two metal layers and a dielectric substrate. Each of the upper metal layer and the lower metal layer comprises a round hole and a metal patch structure positioned in the round hole; the metal patch structure comprises a first metal strip and a second metal strip which are vertically intersected, and the first metal strip is provided with first to fourth branches; the first metal strip and the first to fourth branches form a back-to-back symmetrical E-shaped metal patch structure with an outward opening; through adjusting the rotation angle of the upper layer symmetrical E-shaped metal patch structure and the rotation angle difference of the upper layer symmetrical E-shaped metal patch structure and the lower layer symmetrical E-shaped metal patch structure, independent regulation and control of the transmission amplitude and the transmission phase of the circularly polarized wave are realized. Based on the transmission metasurface combined with an array antenna theory, amplitude and phase distribution required by a preset performance index can be obtained through optimization, arbitrary beam forming of circularly polarized waves is further achieved, and the transmission type metasurface has the advantages of being ultrathin, small in size, high in efficiency and the like.

An envelope calculation section 113 calculates the amplitude of a transmission signal after the multiplexing thereof. When the calculated amplitude is beyond a permissible amplitude value, a correction coefficient calculation section 114 calculates a correction coefficient that is the difference between amplitude values before and after a correction. Multiplication sections 115 and 116 calculate a correction value by multiplying a filter coefficient by a correction coefficient. Subtraction sections 119 and 120 subtract the correction value from the transmission signal after a filtering operation. Thereby, the transmission amplitude at the time of a peak can be suppressed without increasing the number of filter operation circuits.

The invention provides a dielectric interface amplitude compensation method and device. the method comprises steps: according to to-be-analyzed seismic data, a root mean square amplitude value of a seismic trace is acquired; a dielectric interface is picked up, and according to the root mean square amplitude value of the seismic trace, an interface reflection amplitude value corresponding to the dielectric interface is calculated; according to the interface reflection amplitude value and a preset seismic energy general value, an interface transmission amplitude value corresponding to the dielectric interface is calculated; according to the interface transmission amplitude value, an interface amplitude compensation factor is calculated; and according to the interface amplitude compensationfactor and the root mean square amplitude value of the seismic trace, dielectric interface amplitude compensation operation is carried out. By using each embodiment in the invention, compensation on the amplitude at the dielectric interface is realized, the seismic data after amplitude compensation more truly reflect changes of underground geology, an accurate data base is provided for processingand interpretation of subsequent seismic data, and the seismic data processing result accuracy is improved.

The invention provides a design method based on a non-uniform transmission broadband PB super surface. The method can be used for designing a broadband vortex light generator. The method comprises thefollowing steps: theoretically deriving that when the phase difference between the two linear polarizations meets the equation that |phi<x>-phi<y>|=pi and the transmission amplitude meets the equation that |T<x>|=|T<y>|=1, high-efficiency transmission of a PB unit can be realized, and establishing a broadband PB metasurface working equation which is shown in the description, wherein f is any frequency in a frequency range from f<1> to f<2>, and a transmission phase of a right-handed circularly polarized wave during excitation of a left-handed circularly polarized wave is represented, i.e.,a super surface has a consistent phase change rate. Compared with the prior art, the vortex light generator designed on the basis of the unit has the advantages of being large in bandwidth, high in circular polarization purity, high in efficiency and the like, and a new research thought is provided for development of the broadband vortex light generator.

The invention discloses a symmetrical terahertz polarization insensitive artificial microstructure. The microstructure is a transmission type hyperbolic surface which is provided with a centrosymmetric split ring structure, and is used for generating various resonant modes. The microstructure comprises a substrate dielectric substrate, and the substrate dielectric substrate is provided with a metal structure, wherein the metal structure is formed by periodically arranging a plurality of cross-shaped metal resonance units, each cross-shaped metal resonance unit comprises a square outer frame and a cross-shaped grating structure, and the cross-shaped grating structure is a cross-shaped grating which is arranged inside the square outer frame and the center of the cross-shaped grating structure is separated. No matter whether the vibration is LC resonance or dipole resonance, the influence of the vibration of the geometric structure on the resonance frequency and the transmission amplitude is very small. Under the excitation of TE and TM, the transmissivity results are consistent, the polarization insensitivity is realized, and the modulation depth of the unpolarized incident light high-speed modulator can be improved. Due to excitation of the high-order resonant mode, the method can be applied to various environments such as high-sensitivity biological detection and narrow-band filtering.

A reference condition generation unit of an ultrasonic diagnostic apparatus generates a reference delay condition and a reference amplitude condition for determining delay time and amplitude of a driving pulse to be supplied to a transducer element at the time of non-simultaneous and parallel reception. A transmission condition generation unit generates a transmission delay condition and a transmission amplitude condition for determining delay time and amplitude of a driving pulse to be supplied to a transducer element at the time of simultaneous and parallel reception, on the basis of the reference delay condition and the reference amplitude condition. A transmission unit sets the delay time and the driving amplitude of the driving pulse to be supplied to a plurality of adjacent transducer elements selected by an element selection unit among the transducer elements arranged in an ultrasonic probe, on the basis of the transmission delay condition and the transmission amplitude condition.

The invention discloses a bone conduction sound production device and wearable equipment, the bone conduction sound production device comprises an external packaging structure, the external packaging structure is internally provided with a hollow cavity, and the hollow cavity is internally provided with a hollow-out elastic sheet, the hollow elastic sheet comprises an inner elastic sheet, an outer elastic sheet sleeved outside the inner elastic sheet and a plurality of connecting elastic sheets connected between the inner elastic sheet and the outer elastic sheet, and the outer elastic sheet is embedded on the external packaging structure; the exciter comprises an upper magnetic part, a lower magnetic part and an upper magnetic bowl connected between the upper magnetic part and the hollowed-out elastic part, and the upper magnetic part and the lower magnetic part are parallel, opposite and mutually isolated in the Z-axis direction; the inner elastic part is connected to an upper magnetic bowl of the exciter, and the hollowed-out elastic part is matched with the upper magnetic bowl to adjust the effective vibration region of the hollowed-out elastic part so as to adjust the resonant frequency point of the device. The wearable equipment provided with the bone conduction sound production device can transmit low-frequency signals, the transmission amplitude is moderate, the whole sound frequency band is balanced, and the user experience and the product sound quality are improved.

The invention provides a double-circuit power control method for a common-tower double-circuit direct current transmission system, and belongs to the technical field of direct current transmission control. The double-circuit power control method is especially suitable for double-circuit power control of the common-tower double-circuit direct current transmission system. The method includes the following steps that in the first stage, the transmission amplitude limit of a common-tower double-circuit direct current transmission project is determined, namely the first stage is an amplitude limiting link; in the second stage, double-circuit power is distributed, namely the second stage is a distribution link which includes power distribution between double-circuit direct currents and power distribution between double poles in a one-circuit direct current. According to the double-circuit power control method for the common-tower double-circuit direct current transmission system, the double-circuit direct current power can be reasonably distributed through a suitable control policy according to operation conditions of the double-circuit direct currents, coordination control over the double-circuit direct current power is achieved, general direct current transmission can be kept unchanged within a short time after failures, and losses of the transmission power can be effectively reduced.

The disclosure concerns a method of simulating the image projected by a mask during photolithography including determining by a processor (702), taking into account the thickness of a masking layer of a mask, a near-field transmission amplitude curve of light passing through the mask across at least one pattern boundary in the initial mask layout; calculating by the processor, for each of a plurality of zones, average values of the curve; and simulating by a simulator (708) the image projected by the initial mask layout during the photolithography based on the average values.

The present invention relates to estimating a direct current (DC) offset of a power detection circuit when an estimated instantaneous amplitude of a continuous-transmission amplitude-modulated (AM) radio frequency (RF) signal is below a first threshold. The power detection circuit may be used to estimate an average output power associated with the continuous-transmission AM RF signal. The estimated average output power may be used as part of a feedback system to regulate the average output power. The estimated DC offset of the power detection circuit may be used to improve the estimate of the average output power, particularly over temperature and supply voltage variations. Estimating the DC offset of the power detection circuit when the estimated instantaneous amplitude of the continuous-transmission AM RF signal is below the first threshold may minimize errors in the estimated DC offset.

An apparatus and method is disclosed that allows a participant in a conference call to receive conference call roster information at a telephone display unit, at a computer display or at both types of display. The conference call information is updated during the call and includes identification of the speaker during a conference call. The conference callers are connected together and identified either by standard caller identification or by other identification provided by the operator. The conference callers' identifications are then transmitted in two ways. First, a coded signal is sent over the telephone connection to a telephone display unit. Second, an information packet is transmitted over the Internet to a conference call participant's computer. A server computer monitors the conference call and the identification of parties involved is updated a and parties are added or disconnected. The speaking party is identified in one of two ways. First, during the call, the speaker's telephone line will have a higher transmission amplitude than the other telephone lines and the line with the highest transmission amplitude will be identified by the server computer. Second, voice identification data is gathered before the conference call and stored in the server computer for use in identifying the speaker.

The invention relates to an intelligent surface synchronizing signal enhancement and interference suppression method based on synchronous transmission and reflection, which comprises the following steps: in a cellular network, according to channel information from a base station 2 to a user 1,c, STAR-RIS2 estimates the intensity of interference received by the user 1,c; and according to the channels of the base station 2 and the STAR-RIS2 and the channels of the STAR-RIS2 and the user 1,c, the interference suppression method of the STAR-RIS2 is determined by taking minimization of interference received by the users as a target and taking a transmission amplitude coefficient and a transmission phase coefficient of the STAR-RIS2 as constraint conditions. And after the transmission amplitude coefficient and the transmission phase coefficient of the STAR-RIS2 are determined, the signal enhancement method of the STAR-RIS1 is determined by using the residual energy, taking maximization of an effective signal received by a user as a target, and taking the reflection amplitude coefficient, the reflection phase coefficient and the total energy of the STAR-RIS1 as constraint conditions.

In a method for optimizing the locating accuracy of an RFID tag in an ultra-high frequency radio range in a system for locating RFID tags in a room comprising a plurality of reading devices, a first step of locating of the RFID tag is initially carried out using methods known from the prior art, whereby for this purpose the RFID tag is detected by at least one reading device. Thereafter cold spots, i.e., points with minimal amplitude, are generated or moved in a targeted fashion in the room using a predetermined variation of the phase position, the frequency and / or the transmission amplitude of the individual reading devices, whereby their location and volume as a function of the phase position, the frequency and the transmission amplitude of the individual reading devices is known by means of simulations and / or measurements. If an RFID tag is no longer detected by any reading device, the same is located in a cold spot, which is identified by means of the first, rough locating of the RFID tag using methods known from the prior art, which allows for accurate locating of the RFID tag.