在多媒体计算机中,语音和音乐是最基本的功能之一。实现模拟音频数字化的主要过程是(12)、量化和编码。人们通常用8位声卡或16位声卡来区分不同的声卡质量。若量化位是8位,并规定输入信号幅度为0~3V,则每一量化单位约对应(13)mV。声卡需使用计算机的资源,因此在安装声卡时要分配适当的中断请求号、(14)和直接存取通道号。
(80)
(78)
(79)
(77)
(66)is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed,length bit string.(67)is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.(68)is an approach preferred by cable TV providers. In this solution the fiber terminates at an opt~electrical converter and the final segment is a shared coaxial cable.(69)is a device used to connect two separate network that use different communication protocol.(70)is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.
(75)
(74)
Password is a secret series of(69)that enables a user to access a file, computer, or program. On multi-user systems, each user must enter his or her password before the computer will respond to(70). The password helps ensure that(71)users do not access the computer. In addition, data files and programs may require a password.
A multimedia system allows end users to share, transfer and process a variety of forms of in- formation in a(75)manller.
SQL Server is a RDBMS( Relational Database Management System)made by Microsoft. This means that the data is stored in two dimensional(74)
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