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基于Wifi的电子看板语音系统设计实现
...脉冲编码调制。该算法中对量化步长的调整使用了简单的映射方法,对于一个输入的PCM值X(n),将其与前一时刻的X(n-1)预测值做差值得到d(n),然后根据当前的量化步长对d(n)进行编码,再用此sample点的编码值调整量化步长,同时还要得到当前sample点的预测值供下一sample点编码使用。通过此算法可将样点编码成4bit的码流,一个符号位和3个幅度位。该算法编解码简单只进行相减、查表运...
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如何解决虚拟环境存储I/O瓶颈问题
...和Panasas主要采用并行网络文件系统(pNFS)技术,这种技术允许用户直接访问存储设备,而且可以并行进行。NetApp则采用了一种名为性能加速模块(PAM)的技术。 BlueArc的产品营销高级经理Gerard Sample说,pNFS解决方案消除了现今使用的旧NFS服务器中出现的可调整性和性能问题。BlueArc的Titan系列产品支持NAS和SAN. Sample表示,pNFS是一种重要技术,因为它可以将基于普遍存在的NFS标准的...
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LabVIEW 8.2的模拟输入编程
...Differential为差分模式,NRSE为单端无参考地模式,Pseudodifferential为伪差分模式,RSE为单端参考地模式。 task out:输出任务标识。 · 第2步:添加DAQmx Timing.VI,在其下拉菜单中选择Sample Clock配置采样参数。rate指定每个通道的采样率;Contirnuous Samples指定采样类型为连续采样;samplesper channel指定连续采样时缓冲区间大小。程序框图如图3所示。 如图3 添加DAQmx Tim...
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数字信号控制器改善了汽车电子中马达的控制性能
...t of a power glitch. This results in a more robust system at a lower cost. Advanced analog peripherals including a high-resolution analog/digital converter (ADC) operating at 1.1 MSample/sec with the ability to support simultaneous sampling and holds of up to eight inputs, which improves system throughput. Enhanced motor control peripheral with up to eight c...
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xTimer V1.0
...re. Since when power up, all port bits are logic high, so I chose the 7407, open collector to provide NPN O/C output. These output bits are suitable for opto-isolator driving. The sample output module is opto-triac, the MC3040. The input circuit is simple with current mode driving, say 15mA is enough for MC3040. The output triac having ZCS drives a 220V coil...
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