SPEECH CHIP COLLECTION
MC3418
Motorola CVSD encoder/decoder used for recorded speech, including the IBM PS/2 Speech Adapter.
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Overview
The MC3418 provides a CVSD recording and playback path. The 1994 Multimedia Data Standards Update identifies it in the IBM PS/2 Speech Adapter, where it works alongside a separate TI LPC speech synthesizer. CVSD represents changes in audio with a one-bit stream; recording and playback depend on the sampling clock.
Technical reference
See the CVSD Wave Type section of the Multimedia Data Standards Update (April 1994), linked from the IBM PS/2 Speech Adapter exhibit.
Machines using this chip
IBM PS/2 Speech Adapter
IBM’s ISA speech adapter combined TMS5220C LPC synthesis with CVSD voice recording and playback.
Explore IBM PS/2 Speech Adapter