The Echo II is a plug-in expansion card, speech synthesizer card for the

Apple II Apple II ("apple Roman numerals, two", stylized as Apple ][) is a series of microcomputers manufactured by Apple Computer, Inc. from 1977 to 1993. The Apple II (original), original Apple II model, which gave the series its name, was designed ...

and Apple IIe personal computers that allow applications to use speech synthesis. The Echo II provides a speaker/headphones jack on board, with a physical volume control adjustment. The Echo II software can synthesize either unlimited text-to-speech using stitched phonemes, or play back raw LPC data for specific words, with resulting higher speech quality. LPC (

linear predictive coding Linear predictive coding (LPC) is a method used mostly in audio signal processing and speech processing for representing the spectral envelope of a digital signal of speech in compressed form, using the information of a linear predictive model ...

) is the speech synthesis technology used, which allowed applications to encode speech data in a compact form. The Echo II uses the TMS 5220 LPC Speech Chip which was popular in other speech synthesizers.

References

External links

Mirrors.apple2.org.za

{{Speech synthesis Apple II peripherals Speech synthesis