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It is concerned with the reliable transfer of data (no residual transmission errors) across the data link being used. A performance measure based on the rate of undetected errors. CR Carriage Return (ASCII control-M). CRC Cyclic Redundancy Check. An error-checking mechanism using a polynomial algorithm based on the content of a message frame at the transmitter and included in a field appended to the frame. At the receiver, it is then compared with the result of the calculation that is performed by the receiver.

The loop acts as a low-pass filter for the input signal and a high-pass filter for the quantization noise. This noise-shaping property is especially suitable for digital audio applications. 62 There are applications where the information that we are looking for can be extracted from the digitally processed signal. In this case, there is no need to produce an output that is analog. So stage 3 in Figure 2-1 does not exist. An example is a receiver for digitally modulated signals. The aim of the receiver is the detection of digital symbols being transmitted.

Diplexing A device used to allow simultaneous reception or transmission of two signals on a common antenna. Duplex The ability to send communications line. Direct Memory Access A technique of transferring data between the computer memory and a device on the computer bus without the intervention of the microprocessor. Also abbreviated to DMA. Dynamic Range The difference in decibels between the overload or maximum and minimum discernible signal level in a system. EBCDIC Discriminator Hardware device to demodulate a frequency modulated carrier or subcarrier to produce analog data.

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