2results 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.

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.