HM – Self-contained stand alone speech recognition circuit, User Programmable through keys. 2 No’s of 7-Segment Display (To Display Voice Recognize. The heart of the circuit is the HM speech recognition IC. AVR SELF LEARNING KIT–Interfacing 16 x 2 LCD in 8 bit ModeIn “AVR. Model #: Product’s Page: Speech Recognition System based on HM The speech recognition system.

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Thanks for dropping by alselectro! Take a look around and grab the RSS feed to stay updated. It is used in Robotics to control motors according to voice commands. The heart of the circuit is the HM speech recognition IC.

Voice Recognition board HM – How to control a motor using voice commands | alselectro

Speech samples are acquired by recognitiob Microphone on board. This 8 bit data can be directly connected to a port of Microcontroller for further action. An 8 kB external RAM is needed to store data.

As the RAM is volatilea 3v button battery is used to backup stored data. The 8 bit data is passed through oit octal latch IC 74HC To display the command numbers 2 common cathode 7 segment displays are provided.


The board requires 5v DC supply. A 12v adapter can be used as a power source, as the board has ,it 5v regulator with heat sink. In the training process user trains the IC by speaking words into the microphone and. This can then be later connected to a microcontroller for further functions. Say the target word into the onboard microphone near LED clearly.

You may continue speecg new words in the circuit. The circuit will accept and recognize up to 20 words numbers 01 through It is not necessary to train all word spaces. If the system has to work under noisy environments, background noise may corrupt the original data and leads to malfunctioning.

Take care to avoid using this board in Noisy places. Let us test the board by connecting to a Motor through a motor driver board L This L can drive 2 motors at a time.

Functioning of L can be understood from this post. Provide a separate 12v DC power source to L board. To rotate LEFT a decimal value of recoynition is assigned.

HM – Speech Recognition Chip

To stop the motor decimal 08 is assigned. The calculation of arriving at these values are shown in table above.

You are commenting using your WordPress. You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email. RoboticsUncategorized — 1 Comment. The IC can recognize 20 words, each word a length of 1. In the training process user trains the IC by speaking words into the microphone and assigning a particular value for that word.


Training Words for Recognition: Before starting the training process we can erase the previous memory. Check out the table recogniton to see how to achieve a number for a Word. Motor Control by Voice Recognition.


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