Formed from the words compressing and expanding. A PCM compression technique where analog signal values are rounded on a non-linear scale. The data is compressed before sent and then expanded at the receiving end using the same non-linear scale. Companding reduces the noise and crosstalk levels at the receiver.
- compact disc
Known by its abbreviation, CD, a compact disc is a polycarbonate with one or more metal layers capable of storing digital information. The most prevalent types of compact discs are those used by the music industry to store digital recordings and CD-ROMs used to store computer data. Both of these types of compact disc are […]
- control bus
The physical connections that carry control information between the CPU and other devices within the computer. Whereas the data bus carries actual data that is being processed, the control bus carries signals that report the status of various devices. For example, one line of the bus is used to indicate whether the CPU is currently […]
- control character
A special, non-printing character that begins, modifies, or ends a function, event, operation or control operation. The ASCII character set defines 32 control characters. Originally, these codes were designed to control teletype machines. Now, however, they are often used to control display monitors, printers, and other modern devices.
- control panel
A Macintosh utility that permits you to set many of the system parameters. For example, you can control the type of beeps the Mac makes and the sensitivity of the mouse. On older Macs (System 6 and earlier), control panels are called cdevs. The Windows operating system has a Control Panel program that offers many […]
- control program
(1) A program that enhances an operating system by creating an environment in which you can run other programs. Control programs generally provide a graphical interface and enable you to run several programs at once in different windows. Control programs are also called operating environments. (2) Another term for operating system.