Design - Home Automation

8/4/2019 Design - Home Automation

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DESIGN

HOME AUTOMATION USING BLUETOOH (SPEECH RECOGNITION)

ABSTRACT:

This paper describes how bluetooth can

be used in controlling various home appliances

for physically challenged and old citizens.

Human speech will play a vital role in

controlling part.

KEYWORDS :

Bluetooth, Speech recognition.

INTRODUCTION

In the near future, speech recognition will

become the method of choice for controlling

appliances, toys, tools, computers and robotics.

With the combination of Bluetooth technology

with a speech recognition system the

application can be extended to a wider scale.

BLUETOOTHHOME

AUTOMATION

BLUETOOTH

Bluetooth is a wireless technology for creating

personal networks operating in the 2.4 GHz

unlicensed band. Networks are usually formed

ad-hoc from portable devices such as cellular

phones, handheld and laptops.

Bluetooth offers higher level service profiles,

e,g, FTP like file servers, file pushing, speech

transport, serial line emulation .

Bluetooth radio basics

Normal power - 1 milli watt Receiver sensitivity - -70dB Frequency Band - 2.4 GHz(ISM)

Bluetooth supports both speech and data.

SPEECH RECOGNITION

Speech recognition systems have another

constraint concerning the style of speech they

can recognize. They are three styles of speech:

isolated, connected and continuous.

Isolated speech recognition systems can just

handle words that are spoken separately. This is

the most common speech recognition systems

available today. The user must pause between

each word or command spoken.

Connected is a half way point between

isolated word and continuous speech


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recognition. Allows users to speak multiple

words.

Continuous is the natural conversational

speech we are use to in everyday life. It is

extremely difficult for a recognizer to shiftthrough the text as the word tend to merge together. For

instance, "Hi, how are you doing?" sounds like "Hi,.how

ya doin" Continuous speech recognition systems

are on the market and are under continual

development.

SPEECH OVER BLUETOOTH

The transmitter and receiver use an

RFCOMM channel as control channel. The

protocol of this channel is based on standard

AT commands with Bluetooth specific

extensions. An example of these extensions is

the volume control or the buttons to accept or

reject calls. For the transport of the audio

stream, the Bluetooth Synchronous

Connection Oriented

link (SCO) channel is used. The SCO channel

is a designated channel within the Bluetooth

piconet that allows the transport of 8 kHz Pulse

Coded Modulation (PCM) audio over the air

that will be encoded using Continuous Variable

Slope Delta (CVSD) modulation.

WORKING OF THE SYSTEM

Whenever the Bluetooth transmitter

receives a speech signal from the user, it

sends the received signal to its pre-paired

Bluetooth receiver. The received signal is

transferred to the processing circuitry, which

consists of

1) IC HM2007

2) 8K X 8RAM

3) 7 segment decoder

IC HM2007

HM2007 is a single chip CMOS speech

recognition circuit with speech analysis ,

recognition process and system control

functions. A isolated word count of 40 can be

recognized and stored in it with the help of

some components like microphone,

keyboard(for programming), SRAM. A

maximum of 1.92 sec of word can be


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recognized. A microphone can be connected

directly to it. (In this project instead of

Microphone, Bluetooth headset is used.)

WHO WILL BENEFIT:

Everyone . Imagine, once this system is

implemented the user can switch off and on any

device without actually having to go and

operate manually. The convenience it would be

offering will greatly save time and effort for all.

To illustrate the benefits, consider a scenario

where the user is in a different room and he

realizes that the TV is still running in the

adjacent room and he is busy cooking that he

can leave it unattended. Now if he use our

system he can switch it off with a single

command of his speech but without our system

he will have to wait until he finishes his work.

And people with physical disabilities would

be greatly benefited, to person who has

problems in his limbs or legs, this would again

be a boon. Fix this to his automatic wheel chair

and to move, all he has to do is simply say a

command and he can get it moving. It would

also greatly benefit the blind, the blind person

need not actually go looking for a switch. All

he has to do isUse his speech

.

CONCLUSION.

If this home automation system gadget is

successfully developed, it will be the new trend

setter in home automation sector. It helps both

the normal and physically challenged people

and reduces the human work a bit less while in

the home.

ACKNOWLEDGMENT

I would like to express my profound thanks

to Sri Krishna College of Engineering and

Technology for their encouragement and

support.

REFERENCES

[1] Gregory Lamm , Gerlando Falauto , JorgeEstrada, Jag Gadiyaram Identifying and

Assessing Security Issues related to

Bluetooth Wireless Networks

[2] Bluetooth SIG, Specification of theBluetooth system, Profiles, Part K:1

"Generic Access Profile", Version 1.1, 11

April 2003, athttp://www.bluetooth.com/.
http://www.bluetooth.com/http://www.bluetooth.com/http://www.bluetooth.com/http://www.bluetooth.com/


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[3] http://nskelectronics.in/files/hm2007 .

[4] http://www.imagesco.com/articles/hm2007.
http://nskelectronics.in/files/hm2007http://nskelectronics.in/files/hm2007http://nskelectronics.in/files/hm2007

Design - Home Automation

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