The immediate predecessors of MP3 were "Optimum Coding in the Frequency Domain" (OCF), and Perceptual Transform Coding (PXFM). These two codecs, along with block-switching contributions from Thomson-Brandt, were merged into a codec called ASPEC, which was submitted to MPEG, and which won the quality competition, but that was mistakenly rejected as too complex to implement. The first practical implementation of an audio perceptual coder (OCF) in hardware (Krasner's hardware was too cumbersome and slow for practical use), was an implementation of a psychoacoustic transform coder based on Motorola 56000 DSP chips. COUNT 5
QSN1 What does OCF stand for? ANS1 Optimum Coding in the Frequency Domain QSN2 What does PXFM stand for? ANS2 Perceptual Transform Coding QSN3 What was the name of the codec that OCF, PFXM and other contributes merged into? ANS3 ASPEC QSN4 Which competition did ASPEC win? ANS4 quality QSN5 What was the first practical implementation based on? ANS5 Motorola 56000 DSP chips