13results about How to "Reduce noise floor" patented technology

The invention provides a radio frequency front-end assembly and a working method thereof. A radio frequency front end assembly comprises a first amplification module, a second amplification module, a third amplification module, a fourth amplification module, a switch assembly used for realizing dual polarization switching, a first circulator, a second circulator, a third circulator, a fourth circulator, a duplexer A, a duplexer B and a power divider. The first amplification module and the second amplification module are connected with the first circulator and the second circulator in a one-to-one correspondence manner; the third amplification module and the fourth amplification module are connected with the third circulator and the fourth circulator in a one-to-one correspondence manner; the switch assembly is connected with the first circulator, the second circulator, the third circulator and the fourth circulator. The first circulator and the second circulator are both connected with the duplexer A, and the third circulator and the fourth circulator are both connected with the duplexer B; and the duplexer A and the duplexer B are both connected with the power divider.

The invention discloses a multistage modulation microwave signal phase noise measurement system and method, and the system comprises a laser light source module which is used for generating an optical carrier signal; the microwave signal module is used for generating a first path of microwave signal and a second path of microwave signal which are the same; the first input end of the first-stage modulation module is connected with the output end of the laser light source module, the second input end of the first-stage modulation module is connected with the output end of the microwave signal module, and the first-stage modulation module is used for loading the first microwave signal to the optical carrier signal to generate a first-stage modulation signal; the input end of the second-stage modulation module is connected with the output end of the first-stage modulation module, and the second-stage modulation module is used for carrying out time delay, phase orthogonality and polarization state modulation on the first-stage modulation signal and loading the second-path microwave signal to the modulated first-stage modulation signal; and the input end of the signal processing module is connected with the output end of the secondary modulation module, and the signal processing module is used for processing the secondary modulation signal to obtain the phase noise of the microwave signal.

The utility model belongs to the field of electric appliances, and particularly relates to a grounding device of a notebook computer, which comprises a two-wire plug, a charging socket is arranged at the top end of the two-wire plug, a first connector is inserted into the charging socket, and a wire is fixedly connected to the top end of the first connector. The top end of the wire is fixedly connected with a second connector, and the top end of the second connector is provided with a Type-C male connector. Through the arrangement of the grounding wire and the three-wire plug, induced electricity generated on the metal surface of the notebook computer is discharged, so that a user is prevented from feeling uncomfortable when touching the notebook computer during use, and the use experience of the user is improved; in addition, by arranging the additional three-wire plug, the cost is lower than that of directly using a grounding power supply, so that the purpose of reducing the expenditure is achieved; by reducing the induced electricity, the problem of bottom noise generated when the notebook computer is connected with the earphone can be effectively reduced, and the situation that current sound appears in the process of using the earphone is avoided.

The utility model belongs to the field of audio power amplifiers, and discloses a filter circuit of an electronic tube power amplifier switching power supply, which comprises an alternating current filter circuit, a full-wave rectifier circuit for converting power frequency alternating current into direct current, and a direct current filter circuit, and an alternating current input end of the full-wave rectifier circuit is connected with the alternating current filter circuit through the alternating current filter circuit. The direct-current output end of the full-wave rectification circuit is connected with the direct-current filter circuit; the filter circuit of the electronic tube power amplifier switching power supply adopts a'double-pi-type 'filter mode of a pi-type alternating-current filter circuit and a pi-type direct-current filter circuit, and has the advantages of simple circuit structure, high efficiency and reasonable design, and in the pi-type direct-current filter circuit, a power frequency inductor adopts a large inductor of a millihenry level, the direct-current output ripple is relatively small, and the filter circuit is stable and reliable. The direct-current voltage at the two ends of the filter capacitor is high, and the current distortion correction and power factor compensation capabilities are improved, so that the power factor of the electronic tube power amplifier switching power supply is effectively improved, and meanwhile, the ground noise level of a power amplifier is also reduced.

This invention provides a method for processing echo signals from a fish finder, the fish finder itself, and a storage medium, comprising: S1, receiving an echo signal; S2, performing envelope processing on the echo signal to obtain an envelope signal; S3, calculating the variance of data within a selected sliding window until a signal segment with a variance value less than a predetermined variance threshold is found; S4, determining the noise floor value of the envelope signal based on the average amplitude of the found signal segment; S5, determining the starting position of a weak signal data segment based on the location of signal points with amplitudes less than the noise floor value; S6, performing partial filtering on the envelope signal to obtain the image signal to be displayed, and performing IIR filtering or FIR filtering on the weak signal data segment; signal segments other than the weak signal data segment retain their original values. Using the above technical solution, weak signals in the echo signal can be identified, thereby improving the sensitivity of the fish finder.

The present invention relates to the field of laser radar technology, and discloses a laser radar scanning head with isolated light receiving and light path, comprising: a transmitting mirror assembly, comprising an output mirror, a receiving mirror surrounding the output mirror, and a first isolation lens barrel and a second isolation lens barrel isolating the output mirror from the receiving mirror and being arranged on both sides of the normal line of the output mirror; the internal spaces of the first isolation lens barrel and the second isolation lens barrel are connected to the surface of the output mirror; a reflector assembly has the same structure as the transmitting mirror assembly; and a window plate assembly, comprising a third isolation lens barrel, an output window plate arranged in the third isolation lens barrel of the reflector assembly, and a receiving window plate arranged outside the third isolation lens barrel, the output window plate forms an acute angle with the central axis of the third isolation lens barrel, the receiving window plate is perpendicular to the central axis of the third isolation lens barrel, the third isolation lens barrel is connected to the first isolation lens barrel of the reflector assembly and is coaxially arranged, so as to prevent the output laser beam from entering the receiving system before exiting the system.

A receiver and electronic device for a low-voltage power line high-speed carrier communication system are disclosed. The receiver includes a low-noise amplifier, a first transconductance amplification link, a second transconductance amplification link, and an adder. The low-noise amplifier receives a received signal at its input terminal and its output terminal is coupled to the input terminals of the first and second transconductance amplification links. The output terminal of the first transconductance amplification link is coupled to the first input terminal of the adder. The output terminal of the second transconductance amplification link is coupled to the second input terminal of the adder. The output signals of the first and second transconductance amplification links have opposite polarities. The adder outputs the addition result. This design effectively reduces the receiver's noise floor and improves its signal-to-noise ratio.

The utility model discloses a soft package battery and an earphone. The soft package battery is applied to the earphone and comprises a battery shell, a battery cell and a flexible circuit board, the battery cell is arranged in the battery shell and comprises a positive plate and a negative plate; the flexible circuit board comprises a demagnetizing part, a first connecting part and a second connecting part, and the demagnetizing part is connected between the first connecting part and the second connecting part; wherein the first connecting part is electrically connected to the negative plate; the battery shell comprises a first power supply end and a second power supply end, the positive plate is electrically connected to the first power supply end, and the second connecting part is connected to the second power supply end; wherein the first power supply end and the second power supply end are used for supplying power to the earphone. The soft package battery provided by the utility model can reduce the bottom noise generated by the magnetic field of the soft package battery, thereby improving the playing quality of the earphone.

The present invention discloses an infrared image denoising method based on sgm-delta, which comprises the following steps: S1: determining a point set that can participate in filtering in a neighborhood; S2: performing sgm-delta quantization encoding on the point set; S3: calculating a denoising result through the encoding value. The present invention performs image denoising based on the sgm-delta noise shaping principle, which broadens the bandwidth and divides the noise energy equally in the entire bandwidth range, thereby reducing the background noise and improving the signal-to-noise ratio.

The present application discloses an audio system, which includes an audio generating part and an audio playing part, wherein the audio generating part and the audio playing part are communicatively connected; the audio generating part includes an audio generating mainboard, a first area on the surface of the audio generating mainboard is provided with a digital ground, a second area on the surface of the audio generating mainboard is provided with a first analog ground, and the digital ground and the first analog ground are connected at a target position through a first signal line, wherein the target position is the position where the digital-to-analog conversion component on the audio generating mainboard is located; the audio generating mainboard also includes an audio generating circuit for generating an audio signal; the audio playing part includes an amplifier mainboard and a speaker, the amplifier mainboard includes an amplifier chip, and the amplifier chip is used to amplify the power of the audio signal generated by the audio generating circuit; the speaker is used to play the audio signal after power amplification. In this way, the background noise can be reduced and the audio playing quality can be improved.

The utility model relates to microphone technical field, concretely is a screw -free microphone shell structure, including casing, bottom shell and inner support, the bottom shell sets up at the bottom opening place of casing, the inner support sets up in casing, the inner support includes first connecting seat, support main part and second connecting seat, wherein first connecting seat and second connecting seat set up in the upper and lower both ends of support main part, the end part of support main part towards second connecting seat and second connecting seat all set up in bottom shell. The utility model proposes technical scheme, and the bottom shell is directly fixed and is connected with the inner support with thread mode and forms microphone bottom structure, need not through screw and carry out the lock operation of casing and bottom shell, on the one hand, reduces the operation amount, improves assembly efficiency, on the other hand, reduces the number of microphone independent parts, reduces the bottom noise brought by multi -stage vibration of parts, can improve the tone quality of microphone.

The utility model provides a kind of noise reduction hearing aid with sound guide pipe, it is related to medical instrument technical field, the device includes shell, circuit board, sound tube, sound guide pipe, reverse silicon microphone, since sound hole is directly arranged on circuit board, can make reverse silicon microphone directly welded on circuit board, improve the efficiency of production and the stability of product, greatly improve production efficiency, reduce people's labor time, and in order to facilitate the transmission of sound, sound tube is designed between sound hole and sound hole, specifically, first through-hole is provided on sound tube, one end of first through-hole is directly connected with sound hole, and the other end is directly connected with sound hole, since sound tube is closely attached to sound hole and sound hole, compared with the card slot design of previous separate wire link, the operation sound in the cavity of silicon microphone to shell is avoided, the bottom noise of hearing aid machine itself is reduced, and the transmission effect of sound is guaranteed.

A broadcast terminal automatic tuning method, system, product and medium based on geographic position matching, relate to the field of broadcast automatic tuning. The method comprises: acquiring current position information and matching target broadcast information unit to extract a candidate frequency set; sorting the candidate frequencies based on the locally stored historical tuning success rate and sequentially performing automatic tuning; when the reception quality of the tuned frequency meets the requirements, locking it as the target frequency to establish the reception state; continuously monitoring the dynamic changes of real-time position and signal quality during reception; when the position or signal changes meet the preset conditions, extracting new candidate frequencies to perform automatic switching; recording the operation results of the above tuning and switching, and dynamically updating the local historical tuning success rate accordingly. The technical solution provided by the present application improves the stability of broadcast service reception.