Motorola DSP-56009
Little is documented about the DSP-56009 as a product of its own, because it isn't one. It's a Motorola digital signal processor, a chip sold to equipment makers and not to end users. Nearly everything the period record says about it comes filtered through the hardware it powered. Its best-documented appearance is inside Krell's Dolby Digital surround processor, where it did the decoding. Audio (December 1997, p.106) described it as a 24-bit, 80-MHz chip and passed along Krell's claim that it delivered 20 dB better signal-to-noise and an order-of-magnitude reduction in harmonic distortion compared with earlier processing.
No production dates, original price, or Motorola data-sheet specs are in the archive's files yet. What the record confirms:
- 24-bit digital signal processor
- 80 MHz clock speed
- Built for Dolby Digital decoding
- Used in high-end audio gear — notably Krell, per Audio, Dec 1997
If you have a Motorola data sheet or a service manual that names the 56009, send it our way.
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