Voice recognizer - Electronic Circuits Projects Diagrams Free

paparts · 27th November 2006, 12:05 PM

Have you seen the hollow man? Have you noticed how they go up and down the elevator? I want to design how their voice are recognized. Can you give me ideas on how to start? tnx

Papabravo · 27th November 2006, 01:14 PM

I would start with a frequncy analysis of a voice sample. It could be an analog analysis with an array of narrow bandpass filters which measure the sounde energy over a range of frequencies. It could be a digital analysis using a Fast Fourier Transform or related algorithm to digitally extract the sound energy as a function of frequency. Assuming you could account for amplitude variations you could use a goodness of fit criteria to match a sample to stored transforms looking for a match.

BTW I have no idea weather either approach would be successful, it's not my field.

dknguyen · 27th November 2006, 01:50 PM

I think you would use an ADC to digitize the sounds coming in after passing it through some filters. THen you would use some Fourier transform (you would probably need a DSP rather than an MCU), and then maybe normalize the fourier spectra and run it against a library, making sure to take into account possible fuzziness and variation in readings?

I guess you would probably also average it over time in order to ignore sounds that are constantly there, but that's later on.

Electronics4you · 27th November 2006, 04:13 PM

Just use the VR Stamp from Sensory

http://www.sensoryinc.com/html/suppo.../80-0281-E.pdf
http://www.sensoryinc.com/html/suppo.../80-0274-E.pdf

Oznog · 27th November 2006, 07:25 PM

There are 3 terms, which often get mixed up in common use:
1. Voice Detection (VOX)- just tell if someone is speaking, used to key a microphone
2. Speech Recognition (Word Recognition)- recognize the words in speech
3. Speaker Recognition- recognize the identity of who is speaking among multiple possible options

Sceadwian · 28th November 2006, 04:59 AM

For the cost that would be required to reliably re-create something like that you could probably higher someone at minimum wage to listen to mass microphone input and push the buttons for them..

Papabravo · 28th November 2006, 04:05 PM

Elbonians would be more than happy to quote your outsourcing requirements. Grin

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27th November 2006, 12:05 PM	#1
paparts	Voice recognizer Have you seen the hollow man? Have you noticed how they go up and down the elevator? I want to design how their voice are recognized. Can you give me ideas on how to start? tnx

27th November 2006, 01:14 PM	#2
Papabravo	I would start with a frequncy analysis of a voice sample. It could be an analog analysis with an array of narrow bandpass filters which measure the sounde energy over a range of frequencies. It could be a digital analysis using a Fast Fourier Transform or related algorithm to digitally extract the sound energy as a function of frequency. Assuming you could account for amplitude variations you could use a goodness of fit criteria to match a sample to stored transforms looking for a match. BTW I have no idea weather either approach would be successful, it's not my field.

27th November 2006, 01:50 PM	#3
dknguyen	I think you would use an ADC to digitize the sounds coming in after passing it through some filters. THen you would use some Fourier transform (you would probably need a DSP rather than an MCU), and then maybe normalize the fourier spectra and run it against a library, making sure to take into account possible fuzziness and variation in readings? I guess you would probably also average it over time in order to ignore sounds that are constantly there, but that's later on.

27th November 2006, 04:13 PM	#4
Electronics4you	Just use the VR Stamp from Sensory http://www.sensoryinc.com/html/suppo.../80-0281-E.pdf http://www.sensoryinc.com/html/suppo.../80-0274-E.pdf

27th November 2006, 07:25 PM	#5
Oznog	There are 3 terms, which often get mixed up in common use: 1. Voice Detection (VOX)- just tell if someone is speaking, used to key a microphone 2. Speech Recognition (Word Recognition)- recognize the words in speech 3. Speaker Recognition- recognize the identity of who is speaking among multiple possible options __________________ I thought what I'd do was I'd pretend I was one of those deaf-mutes.

28th November 2006, 04:59 AM	#6
Sceadwian	For the cost that would be required to reliably re-create something like that you could probably higher someone at minimum wage to listen to mass microphone input and push the buttons for them..

28th November 2006, 04:05 PM	#7
Papabravo	Elbonians would be more than happy to quote your outsourcing requirements. Grin