Signals are any time varying quantity having lot of Information and have its own frequency. Signal can be classified into random signal, periodic signals, and non-periodic signals, discrete or digital signal. Signal may contain various data like audio, vedio, or in text format. Signal also has information like images. But question arises of security of signal. So; Signals can be making secure by using the different Security techniques such as encryption and decryption by using RSA algorithm, Stegnography, Digital watermarking techniques. In this paper we are going to discuss transmission of Signal and their modulation techniques and its security by using “Digital Watermarking Techniques” with help of “Discrete Wavelet Transform”.
Gonge, Sudhanshu S. and Lathi, Rekha
"Digital Watermarking Technique used for Security of Digital Images during Broadcasting and Telecasting by Using DWT,"
International Journal of Electronics Signals and Systems: Vol. 1
, Article 8.
Available at: https://www.interscience.in/ijess/vol1/iss3/8