排序方式: 共有13条查询结果,搜索用时 15 毫秒
1.
人工头制式录声技术的概念是众所周知的。但技术上必须用耳机重放。如果用扬声器重发,由于串扰使立体声效果损坏。串扰是指右耳听右扬声器的声音时也听到左扬声器的声音,反之左耳也如此。数字信号处理技术提供了可以加入人工串扰以抵消自然串扰的前景,从而保存用耳机重放所具有的立体声效果,如图1所示,其中X_l和X_r表示在两耳鼓膜处重发声压的两通路信号,下标l和r分别相应于左、右耳;Y_l和Y_4是输入扬声器的信号;Z_l和Z_r为用扬声器重发时耳膜处声压。H表示由Z到Z的转移函数。因此 相似文献
2.
3.
I present a new protocol for three-party quantum secure direct communication (QSDC) with a set of ordered M Einstein-Podolsky-Rosen (EPR) pairs. In the scheme, by performing two unitary operations and Bell state measurements, it is shown that the three legitimate parties can exchange their respective secret message simultaneously. Then I modify it for an experimentally feasible and secure quantum sealed-bid auction (QSBD) protocol. Furthermore, I also analyze th~ecurity of the protocol, and the scheme is proven to be secure against the intercept-and-resend attack, the disturbancb attack and the entangled-and-measure attack. 相似文献
4.
5.
We investigate the existing arbitrated quantum signature schemes as well as their cryptanalysis, including intercept- resend attack and denial-of-service attack. By exploring the loopholes of these schemes, a malicious signatory may success- fully disavow signed messages, or the receiver may actively negate the signature from the signatory without being detected. By modifying the existing schemes, we develop counter-measures to these attacks using Bell states. The newly proposed scheme puts forward the security of arbitrated quantum signature. Furthermore, several valuable topics are also presented for further research of the quantum signature scheme. 相似文献
6.
7.
8.
采用耳机虚拟声重发的方法,探讨了掩蔽信号和被掩蔽信号在水平面方向分离的情况下延迟时间对前向掩蔽效应的影响.结果表明,掩蔽阈值有随延迟时间增加而下降较多的总体趋势.而且,在水平面空间分离的情况下,掩蔽阈值存在差值,最大为15 dB左右.但在掩蔽声的声压级较大时(如70 dB),在延迟时间20~40 ms处出现掩蔽阈值差值的小幅度上升.通过对时间积分效应和基膜响应的分析,这一实验结果能得到合理的解释. 相似文献
9.
10.
无线分布式测量系统中,测量时钟的同步与校时是系统实现的重点和难点技术问题。本文提出一种基于主站GPS的无线精确校时方案,即在主站配置GPS同步时钟源,再通过无线帧信号广播重发侦听方式,对子站时钟进行高精度同步校时。文章重点讨论了利用nRF905无线模块实现广播重发侦听校时的网络系统结构、校时原理、校时精度、较传统无线校时方案的优势以及其它影响校时精度的因素等内容。本校时方案应用于在线绝缘带电检测系统使中,既降低了硬件成本,又取得了高精度的校时效果,完全满足系统设计要求。 相似文献