Since telephone is the only ubiquitous communications device in current world, it is the largest potential application field for speech techniques. Telephony speech recognition is a core technique for such telephone-based speech applications. It is well known that the bandwidth of telephone line is limited to 300~3400Hz and there are many inherent variations within the telephone network. All th...

A high capacity communication satellite interconnects scores of ground stations simultaneously. Under the Satellite-Switched/ Time Division Multiple Access (SS/TDMA.) system, each channel of the satellite is allocated to a pair of ground stations for a certain time period, after which the whole set of allocations (called a switch) is changed simultaneously. The problem we address is to minimize...

We propose a notion of passivity for hybrid systems. Our work is motivated by problems in haptics and teleoperation where several computer controlled mechanical systems are connected through a communication channel. To account for time delays and to better react to user actions it is desirable to design controllers that can switch between different operating modes. Each of the interacting syste...

Research on spectrum sensing and spectrum switching that are the key technologies of cognitive radio dynamic spectrum access is carried out in this paper. In order to reduce the required number of dualistic detection when in low spectrum occupancy rate and reduce the complexity of wideband spectrum sensing calculation, this paper presents a wideband spectrum sensing method based on group testin...

This study investigates the joint impact of information communications technology (ICT) infrastructure, financial development (FD), and trade openness (TO) on economic growth (EG). includes two contrasting countries that differ from each other based income level consider total sample size 85 (including 27 low- 58 high-income countries) for period 2000–2019. We framed various hypotheses then app...

Voice over IP (VoIP) is rapidly changing the way we use the telephone for voice communications. The term "Voice over IP" defines the transport of VoIP‐based networks, including the signaling and streaming protocols as well as describing the codecs. VoIP is widely used by all kinds of consumers ranging from computer enthusiasts who are excited to get free long‐distance calls over the Internet to...

The theoretical foundations of Taguchi Methods were laid out by Genichi Taguchi, a Japanese engineer who began working for the telecommunications company, ECL (Electrical Communications Lab, a part of NT&T), in 1950’s. After World War II, his team was involved in the design of telephone system components, and successfully produced designs that performed better than their main rivals, Bell Labs,...

The majority of communications applications, from cellular telephone conversations to credit card transactions, assume the availability of a reliable network. At this level, data are expected to traverse the network and to arrive intact at their destination. The physical systems that compose a network, on the other hand, are subjected to a wide range of problems, ranging from signal distortion ...

Mobile telephone systems divide the coverage area among low transmitting power sectors. This allows the so-called frequency reuse between sectors: geographically “distant” sectors might employ the same electromagnetic frequencies, since the probability of interference between them is small. The electromagnetic frequencies available for mobile communications are very limited and their use is reg...

For Internet Telephony to be a viable alternative to the Public Switch Telephone Network (PSTN), efficient and high quality communications are required. This paper proposes an optimization algorithm that selects parameters like coding scheme, packet loss bound, and maximum link utilization level in a Voice over IP (VoIP) network. The goal is to deliver guaranteed Quality of Service (for voice) ...