It's not something that you can just build and it will work first time.įor this project, you will need an Arduino Nano (or Uno or Mini or similar so long as it uses a 16MHz ATmega328), a microphone and an amplifier for the microphone. It's something for you to work on and improve. Maybe you can improve my code and do better. Under ideal conditions I was getting 90% to 95% correct recognition which is roughly what people were getting in the 1970s. Then you could add speech output using, for instance, the Talkie library.ĭid it work? Well, more or less.
If you search Instructables for "Alexa" or "Siri", you'll find around 200 projects - many of them could benefit from not requiring an internet connection. Or what about a remote-control robot? An MP3 player while jogging? There are lots of places where a dozen command words could be useful. Any sort of hands-free display could benefit from simple voice commands. What use is that? Perhaps you want a head-mounted multimeter or a tiny ear-mounted mobile phone with no screen or keyboard. At the other end of the scale is a single speaker saying single words from a small vocabulary. The hard problem of speech recognition is continuous speech by any person using a huge vocabulary. Clearly, a Nano isn't going to be as good as those. So a Nano is in the right ballpark for simple speech recognition but why bother? Other speech recognition projects exist but either require a web connection and that you send all your private conversations to Amazon or Google or they require a larger computer like a Raspberry Pi. Another group had re-purposed a Univac missile fire control system running at 1MIPS. One group had a huge IBM-360 with 128kB but under 1MIPS. The sort of minicomputer people were using back then ran at 0.5 to 8 MIPS and had, say, 2K to 32K of memory split between program and data. How does a Nano compare with back then? A Nano has 2KB RAM, 32KB program ROM and runs at about 10 MIPS (depending on the instruction mix). Could an Arduino Nano do the same as a computer from that era? I was desperate for something to read during lockdown and found in my bookcase an IEEE report on Speech Recognition from the late 1970s.
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