Compression efficiency of encoders is typically defined by the bit rate, because compression ratio depends on the bit depth and sampling rate of the input signal. Nevertheless, compression ratios are often published. They may use the Compact Disc (CD) parameters as references (44.1 kHz, 2 channels at 16 bits per channel or 2×16 bit), or sometimes the Digital Audio Tape (DAT) SP parameters (48 kHz, 2×16 bit). Compression ratios with this latter reference are higher, which demonstrates the problem with use of the term compression ratio for lossy encoders. COUNT 5
QSN1 What defines the compression efficiency of encoders? ANS1 bit rate QSN2 Compression ratio depends on the sample rate and bit depth of which signal? ANS2 input QSN3 What does CD stand for? ANS3 Compact Disc QSN4 Other than CD parameters, what else can be used as parameter references? ANS4 Digital Audio Tape (DAT) SP QSN5 What can CD parameters be used as references for? ANS5 compression ratios