Early MPEG Layer III encoders used what is now called Constant Bit Rate (CBR). The software was only able to use a uniform bitrate on all frames in an MP3 file. Later more sophisticated MP3 encoders were able to use the bit reservoir to target an average bit rate selecting the encoding rate for each frame based on the complexity of the sound in that portion of the recording. COUNT 5
QSN1 What does the term CBR mean? ANS1 Constant Bit Rate QSN2 Which early MPEG layer used CBR? ANS2 Layer III QSN3 The early software was restricted to which kind of bitrate? ANS3 uniform QSN4 What did more sophisticated MP3 encoders use to target an average bit rate? ANS4 bit reservoir QSN5 What did encoders base the encoding rate for each frame on? ANS5 the complexity of the sound