A mini program code (also known as sunflower code) comes with WeChat APPs. With the popularization of APPs, codes have become more and widely used. As a new carrier, study information hiding technology based on is great significance for expansion covert communication carriers can also deal security problems in advance. At present, to best our knowledge, there no steganographic research codes. I...

Public telephone systems transmit speech across a limited frequency range, about 300–3400 Hz, called narrowband (NB) which results in significant reduction of quality and intelligibility speech. This paper proposes fully backward compatible novel method for bandwidth extension NB The uses adaptive data hiding technique to provide perceptually better wideband signal. spectral envelope parameters...