Voice/sound recognition

[edi]

Hi,

Any idea how to recognize specific sound or voice using PIC 16Fxxx device? Small circuit beside the PIC... is also possible.
(Need to recognize just one kind of sound/voice not simple frequency)

Edi

[Haplo]

What do you exactly mean by 'Recognize'?

[Guest]

Get a microphone, hook it up to the PIC. Turn on the PIC. Speak into the mic.

DONE.

[PCM programmer]

Microchip has a speech recognition library for their dsPIC chips.
But, it's not free, and it's not for small quantities. But at least
this answers your question of "is it possible ?"
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en020141

[edi]

I want to activate an alarm just if a specific sound heard. Not for any noise!
Of course a MIC is needed and amplifier.

[mkent]

Look up LM567; it may be what you want. Mick

[yerpa]

You have a lot of work ahead of you. Beyond simple filtering and amplitude detection, you won't have much of an intelligent conversation with a PIC. Maybe two commands at best. You've got to be more specific about what your "specific sound" is. DTMF detection is possible and you can search Microchips app notes for that. Good luck.

[John Morley]

Hi,

There is an IC available that can "learn" a small number of spoken works, and has a microcontroller interface. I'm at the office now, and the info on this is at home, but I will post a followup later on. If I remember correctly, I got it at Jameco or Digikey.
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John Morley

[John Morley]

Hi,

The kit I was referring to is made by Sensory, and is called the VoiceDirect Speech Recognition Kit. You can find their website here: www.sensoryinc.com

Good Luck!
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John Morley

[Trampas]

One trick you can do is connect a mic up to an amp, then run the output through 3 or 4 band pass filters with high gain amplifiers. Then run these band pass outputs to RB or external interrupt pins.

Then when that frequency of signal comes in it triggers interrupt which can be used for limited speech recongition.

Trampas

[SherpaDoug]

I remember reading an article quite a few years ago about someone who could control their robot by whistling. I think they sent a 4 bit command by first whistling a reference tone, then whistling the bits either higher or lower in frequency than the reference. They found they couldn't reliably whistle any specific tone, but they could go above and below a reference. Each command quickly becomes a little 5 note tune that is easy to memorize.

It was probably done in assembly for a 6502 or an 8085 chip. Maybe using one of those dog commanding whistles, or a harmonica might make it easier, at least to start.
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The search for better is endless. Instead simply find very good and get the job done.

[Guest]

I think I remember the article about whistling for robot and remote control. Reliability was an issue. Its not easy to whistle a Manchester-encoded version of "When the saints go marching in" in real time.

[SherpaDoug]

It depends on how many commands are needed. If you can get away with four commands that is only two bits plus one as checksum for four tones total. Of course certain codes need to be avoided so you don't get slapped in mixed company.

Another option might be whistling Morse code. There must be plenty of Morse decoding code for PICs out there.
_________________
The search for better is endless. Instead simply find very good and get the job done.

[PCM programmer]

[Sergio]

John,

I was also looking at the Sensory chip for an upcoming project. Have you played around with it yet?
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Sergio