Bluetooth V/s Cellphone

One of the favorite electronic device I love to have is bluetooth stereo headset. Though I am fancy about it, I wanted to know which one is worst between cellphone and bluetooth. I did questions about it with many guys but there nothing is conceivable. 

Many electronics and communications engineers argued that bluetooth is of a higher frequency(2.4GHz) and mobile is of low frequency(800MHz -2100MHz) and hence mobile is more safer than BT. 

But in reality, the frequency is not the matter of concern* , only the power matters. The power radiated by a BT headset is 0dBm(1mW)  where as a mobile set will radiate up to 33dBm(2W).The power radiated by a mobile set depends on the distance between the tower and mobile set. Though we are not talking in the cellphone, the cellphone will continuously communicate with  the tower to register its presence within the cell(a radiation circle where one tower influences on the device). Weaker the signal received by the cellphone, it will boost the signal level to communicate with tower.

Also my thinking is that, if the cell phone is close to the body, the body capacitance also influence on the power as signal will couple more to the body rather than reaching the tower.(discussion needed). 

Hence, it is better to use bluetooth headset and it is not good to hold the mobile set near to your body (either close to ears/in pockets).

One interesting fact, though frequency is not a matter of concern, in case of bluetooth frequency has one special case. It happened that the natural frequency of water molecule is also 2450MHz(source:http://www.esato.com/archive/t.php/t-29390,1.html). This coincidence frequencies  create heat effect in the body flesh. Read above link for details. 

Finally, bluetooth rocks, please close your white teeth...~:)

List of Books- softcopy available

Books available click here to see the list:

PS:Don't request a book in Mail.

Online passwords how and where?

         I was hearing an incident of hacking of email password of one of my colleagues in the office.He used his email password as his account password with a music site. The hacker hacked his email password.I thought to write about it as many people also not aware of some facts in online surfing. 

In on-line browsing your email id is your identity. It is unique.Never trust an email id unless you have exchanged id  physically or any other secure communication. 

In online world, we have two kinds of accounts. One is account with mail service providers and one with other service providers. The gmail,yahoomail,hotmail...etc are email accounts, where as accounts with ebay,railway booking,ksrtc booking,any music site account...etc  are service accounts. The service account is not at all to give an email id which you can share with your friends/colleagues or add to office data. However, they allow specific communication with respect their service is concerned.

Generally, service accounts ask you to register first time. You need to have email id and and other info. Along with this info, you need to enter password. Which one will you enter ? or email password or something new password?.

Never ,ever enter your email account password. I hope,we hope,every one hope that email accounts providers will not cheat us. They will not take our account data.Hence,email id are unique identity in the virtual world of INTERNET.

Since we are registering same email id with many service accounts and (with email)password, if any fake service account provider hack our email we can not access email account and or any service account any more.

The lose of  your email account is not a simple lose ! In order to make you clear,please note that email account creation needs more information than your service accounts. If your account is used by any one for illegal activities, you will be liable. So,we need to give importance to email accounts as same as we give it to SIM cards.

No bank can ask you any information through email.Such kind of mails are considered as spam. Just delete them or inform to your bank. but never respond.

Another big scandals of this day are online lottery announcement/fund transfer email.These kind of emails are very interesting to read and if you give attention to them you will loose lakhs of rupees.Always believe that  " No one can give you money freely in this world".

I hope this info is good to you.  

Udayavani Download-Perl Script

I always read Udayavani. I read Udayvani to understand the cultural and social face of Udupi. It is almost "pakka" that my permanent nest will be in Udupi. (extra to main topic)..

I read the paper online in the link: http://epaper.udayavani.com/. I had a problem here:After reading first page, I needed to wait sometime to download second page and so on. Most of the time I got irritate with this. In order to solve the problem, I used a small script which download the whole paper to the desktop directory.

Nb: There is nothing special in this code. Just(Junk) do it(JDI).

The perl code is here
#### New udayavani, with self date and directory of download.
###date 10/09/2011.

print "===================================\n
Welcome to Udayavani e-paper
\n===================================\n";

($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)=localtime(time);
$dd=$mday;
$mm=$mon+1;
$yy=$year+1900;
print "Date:",$dd,"-",$mm,"-",$yy,"\n";
print "\n===================================\n";

#=====Date conversion
if ($dd<10){
@day[0]=0;
@day[1]=$dd;
}
else{
@sdd=split(//,$dd);
@day[0]=@sdd[0];
@day[1]=@sdd[1];
}
#=== @day;

#==========month conversion;
if ($mm<10){
@month[0]=0;
@month[1]=$mm;
}
else{
@smm=split(//,$mm);
@month[0]=@smm[0];
@month[1]=@smm[1];
}
#===@month;
#=================year conversion;
@syy=split(//,$yy);
shift(@syy);
shift(@syy);
$date=@day[0].@day[1].@month[0].@month[1].@syy[0].@syy[1];
#print "\n\n", $date,"\n\n"; converted value.


#========download converion for links
@letters=split(//,$date);
$date_part="2011-".@letters[2].@letters[3]."-".@letters[0].@letters[1];
$j=0;
for($i=1;$i<17;$i++){
if($i<10){
@letters[9]=0;
@letters[10]=$i;
}
else{
@letters[9]=1;
@letters[10]=$j;
$j=$j+1;
}
#print @letters,"\n";
$pageName=join("",@letters);
$pageName="Man".$pageName."M.pdf";
$link="http://epaper.udayavani.com/PDF/MANIPAL/".$date_part."\/".$pageName;
print $link,"\n";
#print $pageName;
system("wget --directory-prefix=/home/venkat/Desktop/Udayavani $link");
}

====end of the code =====

Audio Volume-In noisy environments

Hello,

While roaming with Motorola s305 stereo headset, I conceived an idea!
Many times, we need to be in different environments/surroundings where noise level is not constant. If we are listening music in the cool surroundings the volume of the audio may be 5% of the maximum, however, if we are in market area we may need to raise it to 100%.

Since surrounding noise(also called as ambient noise) greatly influence on the volume of audio we like to have. My idea is why we should not design a volume controller such that volume of audio automatically increases or decreased depending on the ambient noise level ?  

There is some kind of technique called ANC-Active Noise Cancellations (http://en.wikipedia.org/wiki/Active_noise_control). But I failed to understand whether I am talking is ANC in different way?