Speech Recognition System
The speech recognition system is a completely assembled and easy to use programmable speech recognition circuit. Programmable, in the sense that you train the words (or vocal utterances) you want the circuit to recognize. This board allows you to experiment with many facets of speech recognition technology. It has 8 bit data out which can be interfaced with any microcontroller for further development. Some of interfacing applications which can be made are controlling home appliances, robotics movements, Speech Assisted technologies, Speech to text translation, and many more.


Features
•Self-contained stand alone speech recognition circuit
•User programmable
•Up to 20 word vocabulary of duration two second each
•Multi-lingual
•Non-volatile memory back up with 3V battery onboard.
Will keep the speech recognition data in memory even
after power off.
•Easily interfaced to control external circuits &
Appliances

Introduction
Speech recognition will become the method of choice for controlling appliances, toys, tools and computers. At its most basic level, speech controlled appliances and tools allow the user to perform parallel tasks (i.e. hands and eyes are busy elsewhere) while working with the tool or appliance. The heart of the circuit is the HM2007 speech recognition IC. The IC can recognize 20 words, each word a length of 1.92 seconds.

Using the System
The keypad and digital display are used to communicate with and program the HM2007 chip. The keypad is made up of 12 normally open momentary contact switches. When the circuit is turned on, “00” is on the digital display, the red LED (READY) is lit and the circuit waits for a command. Training Words for Recognition Press “1” (display will show “01” and the LED will turn off) on the keypad, then press the TRAIN key ( the LED will turn on) to place circuit in training mode, for word one. Say the target word into the onboard microphone (near LED) clearly. The circuit signals acceptance of the voice input by blinking the LED off then on.


For more information about this topic, please follow the link:
http://googleurl?sa=t&source=web&cd=2&ve...asheet.pdf&ei=vai3TJySONvhnQelz_TpCA&usg=AFQjCNFSg4m5sEeJscDYjuyEVQpAfePwIg