5results about How to "Reduce noise floor" patented technology

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.

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 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.