Russian version

Home page

Search:

For contact - E-mail

[an error occurred while processing this directive]
To add or edit advertisment:     e-mail:     password:
IPC 7
H04K-H04K00300

SECTION H – ELECTRICITY


H 04ELECTRIC COMMUNICATION TECHNIQUE


H 04 KSECRET COMMUNICATION; JAMMING OF COMMUNICATION


Note

 In this subclass, the following expression is used with the meaning indicated:

 "secret communication" includes secret line and radiation transmission systems, i.e. those in which apparatus at the transmitting station modifies the signal in such a way that the information cannot be intelligibly received without corresponding modifying apparatus at the receiving station.



1/

00Secret communication (ciphering or deciphering apparatus per se G09C; systems with reduced bandwidth or suppressed carrier H04B 1/66; spread spectrum techniques in general H04B 1/69; by using a sub-carrier H04B 14/08; by multiplexing H04J; transmission systems for secret digital information H04L 9/00; secret or subscription television systems H04N 7/16)

1/

02.by adding a second signal to make the desired signal unintelligible

1/

04.by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band

1/

06.by transmitting the information or elements thereof at unnatural speeds or in jumbled order or backwards

1/

08.by varying the polarisation of transmitted waves

1/

10.by using two signals transmitted simultaneously or successively


3/

00Jamming of communication; Counter-measures (counter-measures used in radar or analogous systems G01S 7/00)


  
 

Copyright SciTecLibrary


To add the material   Terms of registration   Terms for placing technology, inventions, productions & other informations   Price list

You always can buy kamagra online now!
A few occasions when such websites were giving away Free Viagra Trial as real pills intended for door-to-door.