The author innovatively used mock switch to select frequency automatically and provided the probability to realize automatic testing on different kinds of workpieces 本系統(tǒng)創(chuàng)新利用模擬開關(guān)自動進行多路選頻,為實現(xiàn)不同種類工件的自動化檢測提供了可能。
Although bluetooth adopts frequency hopping to avoid interference , its bit error ratio will rise sharply when there are strong interference in the selected frequency band 盡管藍牙采用跳頻方案來避免干擾,但是當(dāng)所選擇的跳頻點上干擾較強時,藍牙系統(tǒng)的誤碼率會受到很大的影響。
Then the resonance demodulation technique is used in analyzing the vibration signal of the gear and ball bearing . to some extent the results depend on the selected frequency band 這一方法的實現(xiàn)步驟是首先對測得的振動信號進行自相關(guān)分析,再對自相關(guān)函數(shù)進行時延,然后對時延后的自相關(guān)函數(shù)進行hilbert變換解調(diào)。