Using 8253 and 8255 sent out the sound with fixed frequency.
并利用8253定时器和8255可编程控制器发出了指定频率的声音。
With fixed frequency control circuit, it provides with over voltage, over current, overheat and short circuit protection.
该系列电源适配器，采用固定频率控制电路，具备限流、限压、过温、短路全功能保护。
The fixed frequency sample PWM method is put forward in this paper together with the theoretical analysis about their switch strategy.
本文提出恒频采样电流跟踪型PWM方式，并对其开关策略进行了理论分析。
The virtual signal generator has 12-channels outputs for linear scanning frequency signal or fixed frequency sine wave excitation signal.
该发生器可以输出相位差可调的12通道线性扫频正弦激励信号或者输出12通道定频正弦激励信号。
Through adding varactors, a new structure is introduced and it realizes controllable wave-beam of fixed frequency which is better for practical use.
文章提出一种新型结构，通过加入变容二极管，实现了在固定频点上波束可控，更适于实际应用。
The transmitting rate of the system varies in period for the fixed frequency lying in the pass band when the thickness of media continuously increases.
对于通带中的固定频率，透射率随介质厚度的增加呈周期性变化。
This platform can simulate the ray tracing for a fixed frequency or sweeping frequencies, also can calculate the group path and the covered region of rays.
该平台可实现定频或扫频射线轨迹演示，计算各射线群路径，覆盖区域等功能。
Besides switching at a fixed frequency for Flyback converters, quasi-resonant mode is widely used due to its lower switch-on losses and better EMI performance.
除了工作在固定的开关频率模式外，由于更小的开通损耗和更好的EMI性能，准谐振工作模式在反激式变换器中得到较广泛的应用。
At present, hopping radio with its feature of strong anti-jamming ability and anti-intercept ability has replaced the traditional fixed-frequency radio.
目前跳频电台以其极强的抗干扰性和抗截获性取代了传统的固频电台。
At present, hopping radio with its feature of strong anti-jamming ability and anti-intercept ability has replaced the traditional fixed-frequency radio.
目前跳频电台以其极强的抗干扰性和抗截获性取代了传统的固频电台。
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