mh2f+@andrew.cmu.edu (Mark Hahn) (02/06/91)
I've been thinking about building a little device to record and play back digitized sound. the idea would be to have d-a and a-d converters hooked up to a single-chip micro with, say, a megabyte of low-power static ram. even something as wimpy as a 68HC11 could do linear predictive coding, compression or even (non-realtime) speech analysis. the device could also be a dictating machine, appointment book, etc. know of any microcontrollers with converters on-chip? recommendations on d-a and a-d converters? how does speech sound using a zero-crossing detector? thanks, mark
mmm@cup.portal.com (Mark Robert Thorson) (02/08/91)
The NEC K2 family offers both A/D and D/A on-chip in some versions, such as the uPD78234. I believe the evaluation board for this is only about $200. I think you also get a PC-based assembler and linker for that price. NEC is (415) 960-6000. Call (800) 632-3531 for literature. In this case, you probably should ask for the uPD7823x data sheet.