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In page MP3:
"The immediate predecessors of MP3 were Optimum Coding in the Frequency Domain (OCF),[3] and Perceptual Transform Coding (PXFM).[4] These two codecs, along with block-switching contributions from Thomson-Brandt, were merged into a codec named ASPEC, which was submitted to MPEG and won the quality competition, but which was rejected as too complex to implement.[citation needed] 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 digital signal processor (DSP) chips.[citation needed]
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