The goal of the LILA project was the collection of speech databases over cellular telephone networks of five languages in three Asian countries. Three languages were recorded in India: Hindi by first language speakers, Hindi by second language speakers and Indian English. Furthermore, Mandarin was recorded in China and Korean in South-Korea. The databases are part of the SpeechDat-family and fo...

Recordings involving cellular telephones or personal digital assistants (“PDAs”) are increasingly the source evidence in audio forensic examinations, compared to recordings originating with other devices such as hand-held digital recorders. On modern PDA cellular telephones recordings can be made either directly to the telephone or transmitted as voice mail messages. The current investigation f...

This paper considers large cellular mobile networks in which the arrival rates of calls for di erent cells are di erent The lower and upper bound of how much the given number of channels would satisfy the arriving calls are presented Numerical examples are given

As mobile telephone traffic demands increase in the future, interest in cellular systems with a hierarchical structure will grow. Hierarchical cellular system can provide high system capacity, efficient channel utilization, and an inherent load-balancing capability. In this type of system, calls blocked in a microcell flow over to a macrocell which is superimposed on a number of microcells. Whe...

A tool for simulating the acoustic conditions during the speech input to a recognition system and the transmission in telephone networks is presented in this paper. The simulation covers the hands-free speech input in rooms and the existence of noise in the background. Furthermore the presence of telephone frequency characteristics can be simulated. Finally the transmission in a cellular teleph...

In this paper, we study the performance of channel assignment algorithms for “channelized” (e.g., FDMA or TDMA) cellular telephone systems, via mathematical models, each of which is characterized by a pair (H,p) , where H is a hypergraph describing the channel reuse restrictions, and p is a probability vector describing the variation of traffic intensity from cell to ceU. For a given channel as...