Hardware Implementation of an Artificial Neural Network - Speech Recognition

This is my graduate project for my Master's Degree at Cal State Northridge. Just finished wiring the circuit on 8/11.

Category:

Science & Technology

Tags:

• Neural Network
• Speech Recognition
• HM2007 IC

[laurisdurrance]

Hi, I am currently using the HM2007 for a class project and I wired it today following the schematic on the website but the chip won't do anything. Not even the READY LED light comes on, which makes me think the chip might be damaged, but I'm not entirely sure. Any ideas? Any help would be greatly appreciated.

[justinwodarck]

@laurisdurrance The HM2007 has a lot of pins to manage. Since the LED isn't coming on, I would check the polarity of the LED (long leg vs short leg) and the power supply to the chip. Grab a digital multimeter and double-check each PIN assignment is what it's supposed to be. I had a few days of "trouble-shooting" after I wired the circuit to actually get it correct. Also, as mentioned in another comment, I had problems blowing the capacitors that filtered the microphone.

[justinwodarck]

@laurisdurrance Part 2... I still have my circuit wired, so let me know if you have any questions on the PIN assignments. I'm sure a rigorous double-check will solve your problem.

[shazlyyyy]

plz i used hm2007 and it cant work how can i get it work plz tell me

[justinwodarck]

@shazlyyyy Part 1...

You're not going to like the answer, but you just need to very carefully follow the wiring diagram in the datasheet. It's best if you buy a complete kit together so that you have the correct ancillary parts for the circuit. I bought a kit SR-07 from Images Scientific Instruments. Also they posted my Master's Project online if that helps: imagesco.com/speech/hm2007-neu­ral-network.pdf

[justinwodarck]

@shazlyyyy @shazlyyyy Part 2…

I can't really answer any more without more information about what's happening with your circuit. If you get it to power up but you just feel that it's not doing voice recognition correctly, I found that I blew my filtering capacitors multiple times during my project. The circuit would be recognizing my words, then all of a sudden it wouldn't recognize anything. If that's the case, just replace your capacitors and that may do the trick. Good Luck!

[laurisdurrance]

@justinwodarck Hi, so I have continued trying to rewire the circuit and now the LED does turn off when detecting a keypress and turns on again when the "train" key is pressed, but nothing else happens after that. I checked out what the !WE, OE, CE1, CE2 pins that are connected to the RAM were doing and they are all at high so nothing is being transferred to the RAM. THen when I speak into the microphone it doesn't blink either so again im not sure what could be going wrong.

[laurisdurrance]

I had some doubt with the buses used on the datasheet soI connected the D0 to I/O0 in the RAM and so on, but the address pins from HM2007 to RAM are not organized in the same way so Im not sure if that has any effect.

[laurisdurrance]

@justinwodarck Thanks so much for the quick reply. The LED finally works, it turns out the breadboard was fried, but now the chip doesn't react to any of the keypresses. The S and K pins detect the press but the LED never turns off and the display is always showing "88". I've double checked the pin assignments assuming the datasheet are correct.

[BluesMan2]

Very very cool